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[PATCH v2] media: atmel: atmel-isc: split driver into driver base and isc




From: Eugen Hristev <eugen.hristev@xxxxxxxxxxxxx>

This splits the Atmel ISC driver into a common base: atmel-isc-base.c
and the driver probe/dt part , atmel-sama5d2-isc.c
This is needed to keep a common ground for the sensor controller which will
be reused.
The atmel-isc will use the common symbols inside the atmel-isc-base
Future driver will also use the same symbols and redefine different aspects,
for a different version of the ISC.
This is done to avoid complete code duplication by creating a totally
different driver for the new variant of the ISC.

Signed-off-by: Eugen Hristev <eugen.hristev@xxxxxxxxxxxxx>
---

Hello Hans,

I am resending this with the required fixes.
You asked me about the #ifdef around ATMEL_ISC_NAME, it's because I was
thinking to have the ATMEL_ISC_NAME different by each driver that use
the atmel-isc.h, but for now I removed any ifdef around it, and will
consider a different define for new drivers.

Changes in v2:
- renamed atmel-isc.c to atmel-sama5d2-isc.c as sama5d2 is the SoC that
  includes this hardware block. The module will still be named atmel-isc.ko
- removed ifdef around definition of ATMEL_ISC_NAME
- moved external declarations in the specific files, this was breaking
  module loading

v4l2-compliance SHA: 0d61ddede7d340ffa1c75a2882e30c455ef3d8b8, 32 bitatmel-isc f0008000.isc: =================  START STATUS  =================

atmelpliance test for atmel-isc device /dev/video0:

Driver Info:
        Driver name      : atmel-isc
        Card type        : Atmel Image Sensor Controller
        Bus info         : platform:atmel-isc f0008000.isc
        Driver version   : 5.2.0
        Capabilities     : 0x84200001
                Video Capture
                Streaming
                Extended Pix Format
                Device Capabilities
        Device Caps      : 0x04200001
                Video Capture
                Streaming
                Extended Pix Format

Required ioctls:
        test VIDIOC_QUERYCAP: OK

Allow for multiple opens:
        test second /dev/video0 open: OK
        test VIDIOC_QUERYCAP: OK
        test VIDIOC_G/S_PRIORITY: OK
        test for unlimited opens: OK

Debug ioctls:
        test VIDIOC_DBG_G/S_REGISTER: OK (Not Supported)
-isc f0008000.isc: Brightness: 0
atmel-isc f0008000.isc: Contrast: 256
atmel-isc f0008000.isc: Gamma: 2
atmel-isc f0008000.isc: White Balance, Automatic: true
atmel-isc f0008000.isc: ==================  END STATUS  ==================
        test VIDIOC_LOG_STATUS: OK

Input ioctls:
        test VIDIOC_G/S_TUNER/ENUM_FREQ_BANDS: OK (Not Supported)
        test VIDIOC_G/S_FREQUENCY: OK (Not Supported)
        test VIDIOC_S_HW_FREQ_SEEK: OK (Not Supported)
        test VIDIOC_ENUMAUDIO: OK (Not Supported)
        test VIDIOC_G/S/ENUMINPUT: OK
        test VIDIOC_G/S_AUDIO: OK (Not Supported)
        Inputs: 1 Audio Inputs: 0 Tuners: 0

Output ioctls:
        test VIDIOC_G/S_MODULATOR: OK (Not Supported)
        test VIDIOC_G/S_FREQUENCY: OK (Not Supported)
        test VIDIOC_ENUMAUDOUT: OK (Not Supported)
        test VIDIOC_G/S/ENUMOUTPUT: OK (Not Supported)
        test VIDIOC_G/S_AUDOUT: OK (Not Supported)
        Outputs: 0 Audio Outputs: 0 Modulators: 0

Input/Output configuration ioctls:
        test VIDIOC_ENUM/G/S/QUERY_STD: OK (Not Supported)
        test VIDIOC_ENUM/G/S/QUERY_DV_TIMINGS: OK (Not Supported)
        test VIDIOC_DV_TIMINGS_CAP: OK (Not Supported)
        test VIDIOC_G/S_EDID: OK (Not Supported)

Control ioctls (Input 0):
        test VIDIOC_QUERY_EXT_CTRL/QUERYMENU: OK
        test VIDIOC_QUERYCTRL: OK
        test VIDIOC_G/S_CTRL: OK
        test VIDIOC_G/S/TRY_EXT_CTRLS: OK
        test VIDIOC_(UN)SUBSCRIBE_EVENT/DQEVENT: OK
        test VIDIOC_G/S_JPEGCOMP: OK (Not Supported)
        Standard Controls: 6 Private Controls: 0

Format ioctls (Input 0):
        test VIDIOC_ENUM_FMT/FRAMESIZES/FRAMEINTERVALS: OK
        test VIDIOC_G/S_PARM: OK
        test VIDIOC_G_FBUF: OK (Not Supported)
        test VIDIOC_G_FMT: OK
        test VIDIOC_TRY_FMT: OK
        test VIDIOC_S_FMT: OK
        test VIDIOC_G_SLICED_VBI_CAP: OK (Not Supported)
        test Cropping: OK (Not Supported)
        test Composing: OK (Not Supported)
        test Scaling: OK (Not Supported)

Codec ioctls (Input 0):
        test VIDIOC_(TRY_)ENCODER_CMD: OK (Not Supported)
        test VIDIOC_G_ENC_INDEX: OK (Not Supported)
        test VIDIOC_(TRY_)DECODER_CMD: OK (Not Supported)

Buffer ioctls (Input 0):
        test VIDIOC_REQBUFS/CREATE_BUFS/QUERYBUF: OK
        test VIDIOC_EXPBUF: OK
        test Requests: OK (Not Supported)

Total for atmel-isc device /dev/video0: 44, Succeeded: 44, Failed: 0, Warnings: 0


 MAINTAINERS                                      |    4 +-
 drivers/media/platform/atmel/Makefile            |    4 +-
 drivers/media/platform/atmel/atmel-isc-base.c    | 2148 ++++++++++++++++++
 drivers/media/platform/atmel/atmel-isc.c         | 2634 ----------------------
 drivers/media/platform/atmel/atmel-isc.h         |  192 ++
 drivers/media/platform/atmel/atmel-sama5d2-isc.c |  365 +++
 6 files changed, 2711 insertions(+), 2636 deletions(-)
 create mode 100644 drivers/media/platform/atmel/atmel-isc-base.c
 delete mode 100644 drivers/media/platform/atmel/atmel-isc.c
 create mode 100644 drivers/media/platform/atmel/atmel-isc.h
 create mode 100644 drivers/media/platform/atmel/atmel-sama5d2-isc.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 5cfbea4..3dc8289 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -10270,7 +10270,9 @@ MICROCHIP ISC DRIVER
 M:	Eugen Hristev <eugen.hristev@xxxxxxxxxxxxx>
 L:	linux-media@xxxxxxxxxxxxxxx
 S:	Supported
-F:	drivers/media/platform/atmel/atmel-isc.c
+F:	drivers/media/platform/atmel/atmel-sama5d2-isc.c
+F:	drivers/media/platform/atmel/atmel-isc.h
+F:	drivers/media/platform/atmel/atmel-isc-base.c
 F:	drivers/media/platform/atmel/atmel-isc-regs.h
 F:	Documentation/devicetree/bindings/media/atmel-isc.txt
 
diff --git a/drivers/media/platform/atmel/Makefile b/drivers/media/platform/atmel/Makefile
index 27000d0..9462736 100644
--- a/drivers/media/platform/atmel/Makefile
+++ b/drivers/media/platform/atmel/Makefile
@@ -1,2 +1,4 @@
-obj-$(CONFIG_VIDEO_ATMEL_ISC) += atmel-isc.o
+atmel-isc-objs = atmel-sama5d2-isc.o atmel-isc-base.o
+
 obj-$(CONFIG_VIDEO_ATMEL_ISI) += atmel-isi.o
+obj-$(CONFIG_VIDEO_ATMEL_ISC) += atmel-isc.o
diff --git a/drivers/media/platform/atmel/atmel-isc-base.c b/drivers/media/platform/atmel/atmel-isc-base.c
new file mode 100644
index 0000000..241a9b2
--- /dev/null
+++ b/drivers/media/platform/atmel/atmel-isc-base.c
@@ -0,0 +1,2148 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Microchip Image Sensor Controller (ISC) common driver base
+ *
+ * Copyright (C) 2016-2019 Microchip Technology, Inc.
+ *
+ * Author: Songjun Wu <songjun.wu@xxxxxxxxxxxxx>
+ * Author: Eugen Hristev <eugen.hristev@xxxxxxxxxxxxx>
+ *
+ */
+
+#include <linux/clk.h>
+#include <linux/clkdev.h>
+#include <linux/clk-provider.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/math64.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_graph.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/videodev2.h>
+
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-event.h>
+#include <media/v4l2-image-sizes.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-fwnode.h>
+#include <media/v4l2-subdev.h>
+#include <media/videobuf2-dma-contig.h>
+
+#include "atmel-isc-regs.h"
+#include "atmel-isc.h"
+
+/* module parameters */
+extern unsigned int debug;
+extern unsigned int sensor_preferred;
+
+/* This is a list of the formats that the ISC can *output* */
+struct isc_format controller_formats[] = {
+	{
+		.fourcc		= V4L2_PIX_FMT_ARGB444,
+	},
+	{
+		.fourcc		= V4L2_PIX_FMT_ARGB555,
+	},
+	{
+		.fourcc		= V4L2_PIX_FMT_RGB565,
+	},
+	{
+		.fourcc		= V4L2_PIX_FMT_ABGR32,
+	},
+	{
+		.fourcc		= V4L2_PIX_FMT_XBGR32,
+	},
+	{
+		.fourcc		= V4L2_PIX_FMT_YUV420,
+	},
+	{
+		.fourcc		= V4L2_PIX_FMT_YUYV,
+	},
+	{
+		.fourcc		= V4L2_PIX_FMT_YUV422P,
+	},
+	{
+		.fourcc		= V4L2_PIX_FMT_GREY,
+	},
+};
+
+/* This is a list of formats that the ISC can receive as *input* */
+struct isc_format formats_list[] = {
+	{
+		.fourcc		= V4L2_PIX_FMT_SBGGR8,
+		.mbus_code	= MEDIA_BUS_FMT_SBGGR8_1X8,
+		.pfe_cfg0_bps	= ISC_PFE_CFG0_BPS_EIGHT,
+		.cfa_baycfg	= ISC_BAY_CFG_BGBG,
+	},
+	{
+		.fourcc		= V4L2_PIX_FMT_SGBRG8,
+		.mbus_code	= MEDIA_BUS_FMT_SGBRG8_1X8,
+		.pfe_cfg0_bps	= ISC_PFE_CFG0_BPS_EIGHT,
+		.cfa_baycfg	= ISC_BAY_CFG_GBGB,
+	},
+	{
+		.fourcc		= V4L2_PIX_FMT_SGRBG8,
+		.mbus_code	= MEDIA_BUS_FMT_SGRBG8_1X8,
+		.pfe_cfg0_bps	= ISC_PFE_CFG0_BPS_EIGHT,
+		.cfa_baycfg	= ISC_BAY_CFG_GRGR,
+	},
+	{
+		.fourcc		= V4L2_PIX_FMT_SRGGB8,
+		.mbus_code	= MEDIA_BUS_FMT_SRGGB8_1X8,
+		.pfe_cfg0_bps	= ISC_PFE_CFG0_BPS_EIGHT,
+		.cfa_baycfg	= ISC_BAY_CFG_RGRG,
+	},
+	{
+		.fourcc		= V4L2_PIX_FMT_SBGGR10,
+		.mbus_code	= MEDIA_BUS_FMT_SBGGR10_1X10,
+		.pfe_cfg0_bps	= ISC_PFG_CFG0_BPS_TEN,
+		.cfa_baycfg	= ISC_BAY_CFG_RGRG,
+	},
+	{
+		.fourcc		= V4L2_PIX_FMT_SGBRG10,
+		.mbus_code	= MEDIA_BUS_FMT_SGBRG10_1X10,
+		.pfe_cfg0_bps	= ISC_PFG_CFG0_BPS_TEN,
+		.cfa_baycfg	= ISC_BAY_CFG_GBGB,
+	},
+	{
+		.fourcc		= V4L2_PIX_FMT_SGRBG10,
+		.mbus_code	= MEDIA_BUS_FMT_SGRBG10_1X10,
+		.pfe_cfg0_bps	= ISC_PFG_CFG0_BPS_TEN,
+		.cfa_baycfg	= ISC_BAY_CFG_GRGR,
+	},
+	{
+		.fourcc		= V4L2_PIX_FMT_SRGGB10,
+		.mbus_code	= MEDIA_BUS_FMT_SRGGB10_1X10,
+		.pfe_cfg0_bps	= ISC_PFG_CFG0_BPS_TEN,
+		.cfa_baycfg	= ISC_BAY_CFG_RGRG,
+	},
+	{
+		.fourcc		= V4L2_PIX_FMT_SBGGR12,
+		.mbus_code	= MEDIA_BUS_FMT_SBGGR12_1X12,
+		.pfe_cfg0_bps	= ISC_PFG_CFG0_BPS_TWELVE,
+		.cfa_baycfg	= ISC_BAY_CFG_BGBG,
+	},
+	{
+		.fourcc		= V4L2_PIX_FMT_SGBRG12,
+		.mbus_code	= MEDIA_BUS_FMT_SGBRG12_1X12,
+		.pfe_cfg0_bps	= ISC_PFG_CFG0_BPS_TWELVE,
+		.cfa_baycfg	= ISC_BAY_CFG_GBGB,
+	},
+	{
+		.fourcc		= V4L2_PIX_FMT_SGRBG12,
+		.mbus_code	= MEDIA_BUS_FMT_SGRBG12_1X12,
+		.pfe_cfg0_bps	= ISC_PFG_CFG0_BPS_TWELVE,
+		.cfa_baycfg	= ISC_BAY_CFG_GRGR,
+	},
+	{
+		.fourcc		= V4L2_PIX_FMT_SRGGB12,
+		.mbus_code	= MEDIA_BUS_FMT_SRGGB12_1X12,
+		.pfe_cfg0_bps	= ISC_PFG_CFG0_BPS_TWELVE,
+		.cfa_baycfg	= ISC_BAY_CFG_RGRG,
+	},
+	{
+		.fourcc		= V4L2_PIX_FMT_GREY,
+		.mbus_code	= MEDIA_BUS_FMT_Y8_1X8,
+		.pfe_cfg0_bps	= ISC_PFE_CFG0_BPS_EIGHT,
+	},
+	{
+		.fourcc		= V4L2_PIX_FMT_YUYV,
+		.mbus_code	= MEDIA_BUS_FMT_YUYV8_2X8,
+		.pfe_cfg0_bps	= ISC_PFE_CFG0_BPS_EIGHT,
+	},
+	{
+		.fourcc		= V4L2_PIX_FMT_RGB565,
+		.mbus_code	= MEDIA_BUS_FMT_RGB565_2X8_LE,
+		.pfe_cfg0_bps	= ISC_PFE_CFG0_BPS_EIGHT,
+	},
+};
+
+/* Gamma table with gamma 1/2.2 */
+const u32 isc_gamma_table[GAMMA_MAX + 1][GAMMA_ENTRIES] = {
+	/* 0 --> gamma 1/1.8 */
+	{      0x65,  0x66002F,  0x950025,  0xBB0020,  0xDB001D,  0xF8001A,
+	  0x1130018, 0x12B0017, 0x1420016, 0x1580014, 0x16D0013, 0x1810012,
+	  0x1940012, 0x1A60012, 0x1B80011, 0x1C90010, 0x1DA0010, 0x1EA000F,
+	  0x1FA000F, 0x209000F, 0x218000F, 0x227000E, 0x235000E, 0x243000E,
+	  0x251000E, 0x25F000D, 0x26C000D, 0x279000D, 0x286000D, 0x293000C,
+	  0x2A0000C, 0x2AC000C, 0x2B8000C, 0x2C4000C, 0x2D0000B, 0x2DC000B,
+	  0x2E7000B, 0x2F3000B, 0x2FE000B, 0x309000B, 0x314000B, 0x31F000A,
+	  0x32A000A, 0x334000B, 0x33F000A, 0x349000A, 0x354000A, 0x35E000A,
+	  0x368000A, 0x372000A, 0x37C000A, 0x386000A, 0x3900009, 0x399000A,
+	  0x3A30009, 0x3AD0009, 0x3B60009, 0x3BF000A, 0x3C90009, 0x3D20009,
+	  0x3DB0009, 0x3E40009, 0x3ED0009, 0x3F60009 },
+
+	/* 1 --> gamma 1/2 */
+	{      0x7F,  0x800034,  0xB50028,  0xDE0021, 0x100001E, 0x11E001B,
+	  0x1390019, 0x1520017, 0x16A0015, 0x1800014, 0x1940014, 0x1A80013,
+	  0x1BB0012, 0x1CD0011, 0x1DF0010, 0x1EF0010, 0x200000F, 0x20F000F,
+	  0x21F000E, 0x22D000F, 0x23C000E, 0x24A000E, 0x258000D, 0x265000D,
+	  0x273000C, 0x27F000D, 0x28C000C, 0x299000C, 0x2A5000C, 0x2B1000B,
+	  0x2BC000C, 0x2C8000B, 0x2D3000C, 0x2DF000B, 0x2EA000A, 0x2F5000A,
+	  0x2FF000B, 0x30A000A, 0x314000B, 0x31F000A, 0x329000A, 0x333000A,
+	  0x33D0009, 0x3470009, 0x350000A, 0x35A0009, 0x363000A, 0x36D0009,
+	  0x3760009, 0x37F0009, 0x3880009, 0x3910009, 0x39A0009, 0x3A30009,
+	  0x3AC0008, 0x3B40009, 0x3BD0008, 0x3C60008, 0x3CE0008, 0x3D60009,
+	  0x3DF0008, 0x3E70008, 0x3EF0008, 0x3F70008 },
+
+	/* 2 --> gamma 1/2.2 */
+	{      0x99,  0x9B0038,  0xD4002A,  0xFF0023, 0x122001F, 0x141001B,
+	  0x15D0019, 0x1760017, 0x18E0015, 0x1A30015, 0x1B80013, 0x1CC0012,
+	  0x1DE0011, 0x1F00010, 0x2010010, 0x2110010, 0x221000F, 0x230000F,
+	  0x23F000E, 0x24D000E, 0x25B000D, 0x269000C, 0x276000C, 0x283000C,
+	  0x28F000C, 0x29B000C, 0x2A7000C, 0x2B3000B, 0x2BF000B, 0x2CA000B,
+	  0x2D5000B, 0x2E0000A, 0x2EB000A, 0x2F5000A, 0x2FF000A, 0x30A000A,
+	  0x3140009, 0x31E0009, 0x327000A, 0x3310009, 0x33A0009, 0x3440009,
+	  0x34D0009, 0x3560009, 0x35F0009, 0x3680008, 0x3710008, 0x3790009,
+	  0x3820008, 0x38A0008, 0x3930008, 0x39B0008, 0x3A30008, 0x3AB0008,
+	  0x3B30008, 0x3BB0008, 0x3C30008, 0x3CB0007, 0x3D20008, 0x3DA0007,
+	  0x3E20007, 0x3E90007, 0x3F00008, 0x3F80007 },
+};
+
+#define ISC_IS_FORMAT_RAW(mbus_code) \
+	(((mbus_code) & 0xf000) == 0x3000)
+
+static inline void isc_update_awb_ctrls(struct isc_device *isc)
+{
+	struct isc_ctrls *ctrls = &isc->ctrls;
+
+	regmap_write(isc->regmap, ISC_WB_O_RGR,
+		     (ISC_WB_O_ZERO_VAL - (ctrls->offset[ISC_HIS_CFG_MODE_R])) |
+		     ((ISC_WB_O_ZERO_VAL - ctrls->offset[ISC_HIS_CFG_MODE_GR]) << 16));
+	regmap_write(isc->regmap, ISC_WB_O_BGB,
+		     (ISC_WB_O_ZERO_VAL - (ctrls->offset[ISC_HIS_CFG_MODE_B])) |
+		     ((ISC_WB_O_ZERO_VAL - ctrls->offset[ISC_HIS_CFG_MODE_GB]) << 16));
+	regmap_write(isc->regmap, ISC_WB_G_RGR,
+		     ctrls->gain[ISC_HIS_CFG_MODE_R] |
+		     (ctrls->gain[ISC_HIS_CFG_MODE_GR] << 16));
+	regmap_write(isc->regmap, ISC_WB_G_BGB,
+		     ctrls->gain[ISC_HIS_CFG_MODE_B] |
+		     (ctrls->gain[ISC_HIS_CFG_MODE_GB] << 16));
+}
+
+static inline void isc_reset_awb_ctrls(struct isc_device *isc)
+{
+	int c;
+
+	for (c = ISC_HIS_CFG_MODE_GR; c <= ISC_HIS_CFG_MODE_B; c++) {
+		/* gains have a fixed point at 9 decimals */
+		isc->ctrls.gain[c] = 1 << 9;
+		/* offsets are in 2's complements, the value
+		 * will be substracted from ISC_WB_O_ZERO_VAL to obtain
+		 * 2's complement of a value between 0 and
+		 * ISC_WB_O_ZERO_VAL >> 1
+		 */
+		isc->ctrls.offset[c] = ISC_WB_O_ZERO_VAL;
+	}
+}
+
+static int isc_wait_clk_stable(struct clk_hw *hw)
+{
+	struct isc_clk *isc_clk = to_isc_clk(hw);
+	struct regmap *regmap = isc_clk->regmap;
+	unsigned long timeout = jiffies + usecs_to_jiffies(1000);
+	unsigned int status;
+
+	while (time_before(jiffies, timeout)) {
+		regmap_read(regmap, ISC_CLKSR, &status);
+		if (!(status & ISC_CLKSR_SIP))
+			return 0;
+
+		usleep_range(10, 250);
+	}
+
+	return -ETIMEDOUT;
+}
+
+static int isc_clk_prepare(struct clk_hw *hw)
+{
+	struct isc_clk *isc_clk = to_isc_clk(hw);
+
+	if (isc_clk->id == ISC_ISPCK)
+		pm_runtime_get_sync(isc_clk->dev);
+
+	return isc_wait_clk_stable(hw);
+}
+
+static void isc_clk_unprepare(struct clk_hw *hw)
+{
+	struct isc_clk *isc_clk = to_isc_clk(hw);
+
+	isc_wait_clk_stable(hw);
+
+	if (isc_clk->id == ISC_ISPCK)
+		pm_runtime_put_sync(isc_clk->dev);
+}
+
+static int isc_clk_enable(struct clk_hw *hw)
+{
+	struct isc_clk *isc_clk = to_isc_clk(hw);
+	u32 id = isc_clk->id;
+	struct regmap *regmap = isc_clk->regmap;
+	unsigned long flags;
+	unsigned int status;
+
+	dev_dbg(isc_clk->dev, "ISC CLK: %s, div = %d, parent id = %d\n",
+		__func__, isc_clk->div, isc_clk->parent_id);
+
+	spin_lock_irqsave(&isc_clk->lock, flags);
+	regmap_update_bits(regmap, ISC_CLKCFG,
+			   ISC_CLKCFG_DIV_MASK(id) | ISC_CLKCFG_SEL_MASK(id),
+			   (isc_clk->div << ISC_CLKCFG_DIV_SHIFT(id)) |
+			   (isc_clk->parent_id << ISC_CLKCFG_SEL_SHIFT(id)));
+
+	regmap_write(regmap, ISC_CLKEN, ISC_CLK(id));
+	spin_unlock_irqrestore(&isc_clk->lock, flags);
+
+	regmap_read(regmap, ISC_CLKSR, &status);
+	if (status & ISC_CLK(id))
+		return 0;
+	else
+		return -EINVAL;
+}
+
+static void isc_clk_disable(struct clk_hw *hw)
+{
+	struct isc_clk *isc_clk = to_isc_clk(hw);
+	u32 id = isc_clk->id;
+	unsigned long flags;
+
+	spin_lock_irqsave(&isc_clk->lock, flags);
+	regmap_write(isc_clk->regmap, ISC_CLKDIS, ISC_CLK(id));
+	spin_unlock_irqrestore(&isc_clk->lock, flags);
+}
+
+static int isc_clk_is_enabled(struct clk_hw *hw)
+{
+	struct isc_clk *isc_clk = to_isc_clk(hw);
+	u32 status;
+
+	if (isc_clk->id == ISC_ISPCK)
+		pm_runtime_get_sync(isc_clk->dev);
+
+	regmap_read(isc_clk->regmap, ISC_CLKSR, &status);
+
+	if (isc_clk->id == ISC_ISPCK)
+		pm_runtime_put_sync(isc_clk->dev);
+
+	return status & ISC_CLK(isc_clk->id) ? 1 : 0;
+}
+
+static unsigned long
+isc_clk_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
+{
+	struct isc_clk *isc_clk = to_isc_clk(hw);
+
+	return DIV_ROUND_CLOSEST(parent_rate, isc_clk->div + 1);
+}
+
+static int isc_clk_determine_rate(struct clk_hw *hw,
+				   struct clk_rate_request *req)
+{
+	struct isc_clk *isc_clk = to_isc_clk(hw);
+	long best_rate = -EINVAL;
+	int best_diff = -1;
+	unsigned int i, div;
+
+	for (i = 0; i < clk_hw_get_num_parents(hw); i++) {
+		struct clk_hw *parent;
+		unsigned long parent_rate;
+
+		parent = clk_hw_get_parent_by_index(hw, i);
+		if (!parent)
+			continue;
+
+		parent_rate = clk_hw_get_rate(parent);
+		if (!parent_rate)
+			continue;
+
+		for (div = 1; div < ISC_CLK_MAX_DIV + 2; div++) {
+			unsigned long rate;
+			int diff;
+
+			rate = DIV_ROUND_CLOSEST(parent_rate, div);
+			diff = abs(req->rate - rate);
+
+			if (best_diff < 0 || best_diff > diff) {
+				best_rate = rate;
+				best_diff = diff;
+				req->best_parent_rate = parent_rate;
+				req->best_parent_hw = parent;
+			}
+
+			if (!best_diff || rate < req->rate)
+				break;
+		}
+
+		if (!best_diff)
+			break;
+	}
+
+	dev_dbg(isc_clk->dev,
+		"ISC CLK: %s, best_rate = %ld, parent clk: %s @ %ld\n",
+		__func__, best_rate,
+		__clk_get_name((req->best_parent_hw)->clk),
+		req->best_parent_rate);
+
+	if (best_rate < 0)
+		return best_rate;
+
+	req->rate = best_rate;
+
+	return 0;
+}
+
+static int isc_clk_set_parent(struct clk_hw *hw, u8 index)
+{
+	struct isc_clk *isc_clk = to_isc_clk(hw);
+
+	if (index >= clk_hw_get_num_parents(hw))
+		return -EINVAL;
+
+	isc_clk->parent_id = index;
+
+	return 0;
+}
+
+static u8 isc_clk_get_parent(struct clk_hw *hw)
+{
+	struct isc_clk *isc_clk = to_isc_clk(hw);
+
+	return isc_clk->parent_id;
+}
+
+static int isc_clk_set_rate(struct clk_hw *hw,
+			     unsigned long rate,
+			     unsigned long parent_rate)
+{
+	struct isc_clk *isc_clk = to_isc_clk(hw);
+	u32 div;
+
+	if (!rate)
+		return -EINVAL;
+
+	div = DIV_ROUND_CLOSEST(parent_rate, rate);
+	if (div > (ISC_CLK_MAX_DIV + 1) || !div)
+		return -EINVAL;
+
+	isc_clk->div = div - 1;
+
+	return 0;
+}
+
+static const struct clk_ops isc_clk_ops = {
+	.prepare	= isc_clk_prepare,
+	.unprepare	= isc_clk_unprepare,
+	.enable		= isc_clk_enable,
+	.disable	= isc_clk_disable,
+	.is_enabled	= isc_clk_is_enabled,
+	.recalc_rate	= isc_clk_recalc_rate,
+	.determine_rate	= isc_clk_determine_rate,
+	.set_parent	= isc_clk_set_parent,
+	.get_parent	= isc_clk_get_parent,
+	.set_rate	= isc_clk_set_rate,
+};
+
+static int isc_clk_register(struct isc_device *isc, unsigned int id)
+{
+	struct regmap *regmap = isc->regmap;
+	struct device_node *np = isc->dev->of_node;
+	struct isc_clk *isc_clk;
+	struct clk_init_data init;
+	const char *clk_name = np->name;
+	const char *parent_names[3];
+	int num_parents;
+
+	num_parents = of_clk_get_parent_count(np);
+	if (num_parents < 1 || num_parents > 3)
+		return -EINVAL;
+
+	if (num_parents > 2 && id == ISC_ISPCK)
+		num_parents = 2;
+
+	of_clk_parent_fill(np, parent_names, num_parents);
+
+	if (id == ISC_MCK)
+		of_property_read_string(np, "clock-output-names", &clk_name);
+	else
+		clk_name = "isc-ispck";
+
+	init.parent_names	= parent_names;
+	init.num_parents	= num_parents;
+	init.name		= clk_name;
+	init.ops		= &isc_clk_ops;
+	init.flags		= CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE;
+
+	isc_clk = &isc->isc_clks[id];
+	isc_clk->hw.init	= &init;
+	isc_clk->regmap		= regmap;
+	isc_clk->id		= id;
+	isc_clk->dev		= isc->dev;
+	spin_lock_init(&isc_clk->lock);
+
+	isc_clk->clk = clk_register(isc->dev, &isc_clk->hw);
+	if (IS_ERR(isc_clk->clk)) {
+		dev_err(isc->dev, "%s: clock register fail\n", clk_name);
+		return PTR_ERR(isc_clk->clk);
+	} else if (id == ISC_MCK)
+		of_clk_add_provider(np, of_clk_src_simple_get, isc_clk->clk);
+
+	return 0;
+}
+
+int isc_clk_init(struct isc_device *isc)
+{
+	unsigned int i;
+	int ret;
+
+	for (i = 0; i < ARRAY_SIZE(isc->isc_clks); i++)
+		isc->isc_clks[i].clk = ERR_PTR(-EINVAL);
+
+	for (i = 0; i < ARRAY_SIZE(isc->isc_clks); i++) {
+		ret = isc_clk_register(isc, i);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+void isc_clk_cleanup(struct isc_device *isc)
+{
+	unsigned int i;
+
+	of_clk_del_provider(isc->dev->of_node);
+
+	for (i = 0; i < ARRAY_SIZE(isc->isc_clks); i++) {
+		struct isc_clk *isc_clk = &isc->isc_clks[i];
+
+		if (!IS_ERR(isc_clk->clk))
+			clk_unregister(isc_clk->clk);
+	}
+}
+
+static int isc_queue_setup(struct vb2_queue *vq,
+			    unsigned int *nbuffers, unsigned int *nplanes,
+			    unsigned int sizes[], struct device *alloc_devs[])
+{
+	struct isc_device *isc = vb2_get_drv_priv(vq);
+	unsigned int size = isc->fmt.fmt.pix.sizeimage;
+
+	if (*nplanes)
+		return sizes[0] < size ? -EINVAL : 0;
+
+	*nplanes = 1;
+	sizes[0] = size;
+
+	return 0;
+}
+
+static int isc_buffer_prepare(struct vb2_buffer *vb)
+{
+	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
+	struct isc_device *isc = vb2_get_drv_priv(vb->vb2_queue);
+	unsigned long size = isc->fmt.fmt.pix.sizeimage;
+
+	if (vb2_plane_size(vb, 0) < size) {
+		v4l2_err(&isc->v4l2_dev, "buffer too small (%lu < %lu)\n",
+			 vb2_plane_size(vb, 0), size);
+		return -EINVAL;
+	}
+
+	vb2_set_plane_payload(vb, 0, size);
+
+	vbuf->field = isc->fmt.fmt.pix.field;
+
+	return 0;
+}
+
+static void isc_start_dma(struct isc_device *isc)
+{
+	struct regmap *regmap = isc->regmap;
+	u32 sizeimage = isc->fmt.fmt.pix.sizeimage;
+	u32 dctrl_dview;
+	dma_addr_t addr0;
+	u32 h, w;
+
+	h = isc->fmt.fmt.pix.height;
+	w = isc->fmt.fmt.pix.width;
+
+	/*
+	 * In case the sensor is not RAW, it will output a pixel (12-16 bits)
+	 * with two samples on the ISC Data bus (which is 8-12)
+	 * ISC will count each sample, so, we need to multiply these values
+	 * by two, to get the real number of samples for the required pixels.
+	 */
+	if (!ISC_IS_FORMAT_RAW(isc->config.sd_format->mbus_code)) {
+		h <<= 1;
+		w <<= 1;
+	}
+
+	/*
+	 * We limit the column/row count that the ISC will output according
+	 * to the configured resolution that we want.
+	 * This will avoid the situation where the sensor is misconfigured,
+	 * sending more data, and the ISC will just take it and DMA to memory,
+	 * causing corruption.
+	 */
+	regmap_write(regmap, ISC_PFE_CFG1,
+		     (ISC_PFE_CFG1_COLMIN(0) & ISC_PFE_CFG1_COLMIN_MASK) |
+		     (ISC_PFE_CFG1_COLMAX(w - 1) & ISC_PFE_CFG1_COLMAX_MASK));
+
+	regmap_write(regmap, ISC_PFE_CFG2,
+		     (ISC_PFE_CFG2_ROWMIN(0) & ISC_PFE_CFG2_ROWMIN_MASK) |
+		     (ISC_PFE_CFG2_ROWMAX(h - 1) & ISC_PFE_CFG2_ROWMAX_MASK));
+
+	regmap_update_bits(regmap, ISC_PFE_CFG0,
+			   ISC_PFE_CFG0_COLEN | ISC_PFE_CFG0_ROWEN,
+			   ISC_PFE_CFG0_COLEN | ISC_PFE_CFG0_ROWEN);
+
+	addr0 = vb2_dma_contig_plane_dma_addr(&isc->cur_frm->vb.vb2_buf, 0);
+	regmap_write(regmap, ISC_DAD0, addr0);
+
+	switch (isc->config.fourcc) {
+	case V4L2_PIX_FMT_YUV420:
+		regmap_write(regmap, ISC_DAD1, addr0 + (sizeimage * 2) / 3);
+		regmap_write(regmap, ISC_DAD2, addr0 + (sizeimage * 5) / 6);
+		break;
+	case V4L2_PIX_FMT_YUV422P:
+		regmap_write(regmap, ISC_DAD1, addr0 + sizeimage / 2);
+		regmap_write(regmap, ISC_DAD2, addr0 + (sizeimage * 3) / 4);
+		break;
+	default:
+		break;
+	}
+
+	dctrl_dview = isc->config.dctrl_dview;
+
+	regmap_write(regmap, ISC_DCTRL, dctrl_dview | ISC_DCTRL_IE_IS);
+	spin_lock(&isc->awb_lock);
+	regmap_write(regmap, ISC_CTRLEN, ISC_CTRL_CAPTURE);
+	spin_unlock(&isc->awb_lock);
+}
+
+static void isc_set_pipeline(struct isc_device *isc, u32 pipeline)
+{
+	struct regmap *regmap = isc->regmap;
+	struct isc_ctrls *ctrls = &isc->ctrls;
+	u32 val, bay_cfg;
+	const u32 *gamma;
+	unsigned int i;
+
+	/* WB-->CFA-->CC-->GAM-->CSC-->CBC-->SUB422-->SUB420 */
+	for (i = 0; i < ISC_PIPE_LINE_NODE_NUM; i++) {
+		val = pipeline & BIT(i) ? 1 : 0;
+		regmap_field_write(isc->pipeline[i], val);
+	}
+
+	if (!pipeline)
+		return;
+
+	bay_cfg = isc->config.sd_format->cfa_baycfg;
+
+	if (ctrls->awb == ISC_WB_NONE)
+		isc_reset_awb_ctrls(isc);
+
+	regmap_write(regmap, ISC_WB_CFG, bay_cfg);
+	isc_update_awb_ctrls(isc);
+
+	regmap_write(regmap, ISC_CFA_CFG, bay_cfg | ISC_CFA_CFG_EITPOL);
+
+	gamma = &isc_gamma_table[ctrls->gamma_index][0];
+	regmap_bulk_write(regmap, ISC_GAM_BENTRY, gamma, GAMMA_ENTRIES);
+	regmap_bulk_write(regmap, ISC_GAM_GENTRY, gamma, GAMMA_ENTRIES);
+	regmap_bulk_write(regmap, ISC_GAM_RENTRY, gamma, GAMMA_ENTRIES);
+
+	/* Convert RGB to YUV */
+	regmap_write(regmap, ISC_CSC_YR_YG, 0x42 | (0x81 << 16));
+	regmap_write(regmap, ISC_CSC_YB_OY, 0x19 | (0x10 << 16));
+	regmap_write(regmap, ISC_CSC_CBR_CBG, 0xFDA | (0xFB6 << 16));
+	regmap_write(regmap, ISC_CSC_CBB_OCB, 0x70 | (0x80 << 16));
+	regmap_write(regmap, ISC_CSC_CRR_CRG, 0x70 | (0xFA2 << 16));
+	regmap_write(regmap, ISC_CSC_CRB_OCR, 0xFEE | (0x80 << 16));
+
+	regmap_write(regmap, ISC_CBC_BRIGHT, ctrls->brightness);
+	regmap_write(regmap, ISC_CBC_CONTRAST, ctrls->contrast);
+}
+
+static int isc_update_profile(struct isc_device *isc)
+{
+	struct regmap *regmap = isc->regmap;
+	u32 sr;
+	int counter = 100;
+
+	regmap_write(regmap, ISC_CTRLEN, ISC_CTRL_UPPRO);
+
+	regmap_read(regmap, ISC_CTRLSR, &sr);
+	while ((sr & ISC_CTRL_UPPRO) && counter--) {
+		usleep_range(1000, 2000);
+		regmap_read(regmap, ISC_CTRLSR, &sr);
+	}
+
+	if (counter < 0) {
+		v4l2_warn(&isc->v4l2_dev, "Time out to update profile\n");
+		return -ETIMEDOUT;
+	}
+
+	return 0;
+}
+
+static void isc_set_histogram(struct isc_device *isc, bool enable)
+{
+	struct regmap *regmap = isc->regmap;
+	struct isc_ctrls *ctrls = &isc->ctrls;
+
+	if (enable) {
+		regmap_write(regmap, ISC_HIS_CFG,
+			     ISC_HIS_CFG_MODE_GR |
+			     (isc->config.sd_format->cfa_baycfg
+					<< ISC_HIS_CFG_BAYSEL_SHIFT) |
+					ISC_HIS_CFG_RAR);
+		regmap_write(regmap, ISC_HIS_CTRL, ISC_HIS_CTRL_EN);
+		regmap_write(regmap, ISC_INTEN, ISC_INT_HISDONE);
+		ctrls->hist_id = ISC_HIS_CFG_MODE_GR;
+		isc_update_profile(isc);
+		regmap_write(regmap, ISC_CTRLEN, ISC_CTRL_HISREQ);
+
+		ctrls->hist_stat = HIST_ENABLED;
+	} else {
+		regmap_write(regmap, ISC_INTDIS, ISC_INT_HISDONE);
+		regmap_write(regmap, ISC_HIS_CTRL, ISC_HIS_CTRL_DIS);
+
+		ctrls->hist_stat = HIST_DISABLED;
+	}
+}
+
+static int isc_configure(struct isc_device *isc)
+{
+	struct regmap *regmap = isc->regmap;
+	u32 pfe_cfg0, rlp_mode, dcfg, mask, pipeline;
+	struct isc_subdev_entity *subdev = isc->current_subdev;
+
+	pfe_cfg0 = isc->config.sd_format->pfe_cfg0_bps;
+	rlp_mode = isc->config.rlp_cfg_mode;
+	pipeline = isc->config.bits_pipeline;
+
+	dcfg = isc->config.dcfg_imode |
+		       ISC_DCFG_YMBSIZE_BEATS8 | ISC_DCFG_CMBSIZE_BEATS8;
+
+	pfe_cfg0  |= subdev->pfe_cfg0 | ISC_PFE_CFG0_MODE_PROGRESSIVE;
+	mask = ISC_PFE_CFG0_BPS_MASK | ISC_PFE_CFG0_HPOL_LOW |
+	       ISC_PFE_CFG0_VPOL_LOW | ISC_PFE_CFG0_PPOL_LOW |
+	       ISC_PFE_CFG0_MODE_MASK | ISC_PFE_CFG0_CCIR_CRC |
+		   ISC_PFE_CFG0_CCIR656;
+
+	regmap_update_bits(regmap, ISC_PFE_CFG0, mask, pfe_cfg0);
+
+	regmap_update_bits(regmap, ISC_RLP_CFG, ISC_RLP_CFG_MODE_MASK,
+			   rlp_mode);
+
+	regmap_write(regmap, ISC_DCFG, dcfg);
+
+	/* Set the pipeline */
+	isc_set_pipeline(isc, pipeline);
+
+	/*
+	 * The current implemented histogram is available for RAW R, B, GB, GR
+	 * channels. We need to check if sensor is outputting RAW BAYER
+	 */
+	if (isc->ctrls.awb &&
+	    ISC_IS_FORMAT_RAW(isc->config.sd_format->mbus_code))
+		isc_set_histogram(isc, true);
+	else
+		isc_set_histogram(isc, false);
+
+	/* Update profile */
+	return isc_update_profile(isc);
+}
+
+static int isc_start_streaming(struct vb2_queue *vq, unsigned int count)
+{
+	struct isc_device *isc = vb2_get_drv_priv(vq);
+	struct regmap *regmap = isc->regmap;
+	struct isc_buffer *buf;
+	unsigned long flags;
+	int ret;
+
+	/* Enable stream on the sub device */
+	ret = v4l2_subdev_call(isc->current_subdev->sd, video, s_stream, 1);
+	if (ret && ret != -ENOIOCTLCMD) {
+		v4l2_err(&isc->v4l2_dev, "stream on failed in subdev %d\n",
+			 ret);
+		goto err_start_stream;
+	}
+
+	pm_runtime_get_sync(isc->dev);
+
+	ret = isc_configure(isc);
+	if (unlikely(ret))
+		goto err_configure;
+
+	/* Enable DMA interrupt */
+	regmap_write(regmap, ISC_INTEN, ISC_INT_DDONE);
+
+	spin_lock_irqsave(&isc->dma_queue_lock, flags);
+
+	isc->sequence = 0;
+	isc->stop = false;
+	reinit_completion(&isc->comp);
+
+	isc->cur_frm = list_first_entry(&isc->dma_queue,
+					struct isc_buffer, list);
+	list_del(&isc->cur_frm->list);
+
+	isc_start_dma(isc);
+
+	spin_unlock_irqrestore(&isc->dma_queue_lock, flags);
+
+	/* if we streaming from RAW, we can do one-shot white balance adj */
+	if (ISC_IS_FORMAT_RAW(isc->config.sd_format->mbus_code))
+		v4l2_ctrl_activate(isc->do_wb_ctrl, true);
+
+	return 0;
+
+err_configure:
+	pm_runtime_put_sync(isc->dev);
+
+	v4l2_subdev_call(isc->current_subdev->sd, video, s_stream, 0);
+
+err_start_stream:
+	spin_lock_irqsave(&isc->dma_queue_lock, flags);
+	list_for_each_entry(buf, &isc->dma_queue, list)
+		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
+	INIT_LIST_HEAD(&isc->dma_queue);
+	spin_unlock_irqrestore(&isc->dma_queue_lock, flags);
+
+	return ret;
+}
+
+static void isc_stop_streaming(struct vb2_queue *vq)
+{
+	struct isc_device *isc = vb2_get_drv_priv(vq);
+	unsigned long flags;
+	struct isc_buffer *buf;
+	int ret;
+
+	v4l2_ctrl_activate(isc->do_wb_ctrl, false);
+
+	isc->stop = true;
+
+	/* Wait until the end of the current frame */
+	if (isc->cur_frm && !wait_for_completion_timeout(&isc->comp, 5 * HZ))
+		v4l2_err(&isc->v4l2_dev,
+			 "Timeout waiting for end of the capture\n");
+
+	/* Disable DMA interrupt */
+	regmap_write(isc->regmap, ISC_INTDIS, ISC_INT_DDONE);
+
+	pm_runtime_put_sync(isc->dev);
+
+	/* Disable stream on the sub device */
+	ret = v4l2_subdev_call(isc->current_subdev->sd, video, s_stream, 0);
+	if (ret && ret != -ENOIOCTLCMD)
+		v4l2_err(&isc->v4l2_dev, "stream off failed in subdev\n");
+
+	/* Release all active buffers */
+	spin_lock_irqsave(&isc->dma_queue_lock, flags);
+	if (unlikely(isc->cur_frm)) {
+		vb2_buffer_done(&isc->cur_frm->vb.vb2_buf,
+				VB2_BUF_STATE_ERROR);
+		isc->cur_frm = NULL;
+	}
+	list_for_each_entry(buf, &isc->dma_queue, list)
+		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
+	INIT_LIST_HEAD(&isc->dma_queue);
+	spin_unlock_irqrestore(&isc->dma_queue_lock, flags);
+}
+
+static void isc_buffer_queue(struct vb2_buffer *vb)
+{
+	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
+	struct isc_buffer *buf = container_of(vbuf, struct isc_buffer, vb);
+	struct isc_device *isc = vb2_get_drv_priv(vb->vb2_queue);
+	unsigned long flags;
+
+	spin_lock_irqsave(&isc->dma_queue_lock, flags);
+	if (!isc->cur_frm && list_empty(&isc->dma_queue) &&
+		vb2_is_streaming(vb->vb2_queue)) {
+		isc->cur_frm = buf;
+		isc_start_dma(isc);
+	} else
+		list_add_tail(&buf->list, &isc->dma_queue);
+	spin_unlock_irqrestore(&isc->dma_queue_lock, flags);
+}
+
+static struct isc_format *find_format_by_fourcc(struct isc_device *isc,
+						 unsigned int fourcc)
+{
+	unsigned int num_formats = isc->num_user_formats;
+	struct isc_format *fmt;
+	unsigned int i;
+
+	for (i = 0; i < num_formats; i++) {
+		fmt = isc->user_formats[i];
+		if (fmt->fourcc == fourcc)
+			return fmt;
+	}
+
+	return NULL;
+}
+
+static const struct vb2_ops isc_vb2_ops = {
+	.queue_setup		= isc_queue_setup,
+	.wait_prepare		= vb2_ops_wait_prepare,
+	.wait_finish		= vb2_ops_wait_finish,
+	.buf_prepare		= isc_buffer_prepare,
+	.start_streaming	= isc_start_streaming,
+	.stop_streaming		= isc_stop_streaming,
+	.buf_queue		= isc_buffer_queue,
+};
+
+static int isc_querycap(struct file *file, void *priv,
+			 struct v4l2_capability *cap)
+{
+	struct isc_device *isc = video_drvdata(file);
+
+	strscpy(cap->driver, ATMEL_ISC_NAME, sizeof(cap->driver));
+	strscpy(cap->card, "Atmel Image Sensor Controller", sizeof(cap->card));
+	snprintf(cap->bus_info, sizeof(cap->bus_info),
+		 "platform:%s", isc->v4l2_dev.name);
+
+	return 0;
+}
+
+static int isc_enum_fmt_vid_cap(struct file *file, void *priv,
+				 struct v4l2_fmtdesc *f)
+{
+	u32 index = f->index;
+	u32 i, supported_index;
+
+	if (index < ARRAY_SIZE(controller_formats)) {
+		f->pixelformat = controller_formats[index].fourcc;
+		return 0;
+	}
+
+	index -= ARRAY_SIZE(controller_formats);
+
+	i = 0;
+	supported_index = 0;
+
+	for (i = 0; i < ARRAY_SIZE(formats_list); i++) {
+		if (!ISC_IS_FORMAT_RAW(formats_list[i].mbus_code) ||
+		    !formats_list[i].sd_support)
+			continue;
+		if (supported_index == index) {
+			f->pixelformat = formats_list[i].fourcc;
+			return 0;
+		}
+		supported_index++;
+	}
+
+	return -EINVAL;
+}
+
+static int isc_g_fmt_vid_cap(struct file *file, void *priv,
+			      struct v4l2_format *fmt)
+{
+	struct isc_device *isc = video_drvdata(file);
+
+	*fmt = isc->fmt;
+
+	return 0;
+}
+
+/*
+ * Checks the current configured format, if ISC can output it,
+ * considering which type of format the ISC receives from the sensor
+ */
+static int isc_try_validate_formats(struct isc_device *isc)
+{
+	int ret;
+	bool bayer = false, yuv = false, rgb = false, grey = false;
+
+	/* all formats supported by the RLP module are OK */
+	switch (isc->try_config.fourcc) {
+	case V4L2_PIX_FMT_SBGGR8:
+	case V4L2_PIX_FMT_SGBRG8:
+	case V4L2_PIX_FMT_SGRBG8:
+	case V4L2_PIX_FMT_SRGGB8:
+	case V4L2_PIX_FMT_SBGGR10:
+	case V4L2_PIX_FMT_SGBRG10:
+	case V4L2_PIX_FMT_SGRBG10:
+	case V4L2_PIX_FMT_SRGGB10:
+	case V4L2_PIX_FMT_SBGGR12:
+	case V4L2_PIX_FMT_SGBRG12:
+	case V4L2_PIX_FMT_SGRBG12:
+	case V4L2_PIX_FMT_SRGGB12:
+		ret = 0;
+		bayer = true;
+		break;
+
+	case V4L2_PIX_FMT_YUV420:
+	case V4L2_PIX_FMT_YUV422P:
+	case V4L2_PIX_FMT_YUYV:
+		ret = 0;
+		yuv = true;
+		break;
+
+	case V4L2_PIX_FMT_RGB565:
+	case V4L2_PIX_FMT_ABGR32:
+	case V4L2_PIX_FMT_XBGR32:
+	case V4L2_PIX_FMT_ARGB444:
+	case V4L2_PIX_FMT_ARGB555:
+		ret = 0;
+		rgb = true;
+		break;
+	case V4L2_PIX_FMT_GREY:
+		ret = 0;
+		grey = true;
+		break;
+	default:
+	/* any other different formats are not supported */
+		ret = -EINVAL;
+	}
+
+	/* we cannot output RAW/Grey if we do not receive RAW */
+	if ((bayer || grey) &&
+	    !ISC_IS_FORMAT_RAW(isc->try_config.sd_format->mbus_code))
+		return -EINVAL;
+
+	v4l2_dbg(1, debug, &isc->v4l2_dev,
+		 "Format validation, requested rgb=%u, yuv=%u, grey=%u, bayer=%u\n",
+		 rgb, yuv, grey, bayer);
+
+	return ret;
+}
+
+/*
+ * Configures the RLP and DMA modules, depending on the output format
+ * configured for the ISC.
+ * If direct_dump == true, just dump raw data 8 bits.
+ */
+static int isc_try_configure_rlp_dma(struct isc_device *isc, bool direct_dump)
+{
+	if (direct_dump) {
+		isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_DAT8;
+		isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED8;
+		isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
+		isc->try_config.bpp = 16;
+		return 0;
+	}
+
+	switch (isc->try_config.fourcc) {
+	case V4L2_PIX_FMT_SBGGR8:
+	case V4L2_PIX_FMT_SGBRG8:
+	case V4L2_PIX_FMT_SGRBG8:
+	case V4L2_PIX_FMT_SRGGB8:
+		isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_DAT8;
+		isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED8;
+		isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
+		isc->try_config.bpp = 8;
+		break;
+	case V4L2_PIX_FMT_SBGGR10:
+	case V4L2_PIX_FMT_SGBRG10:
+	case V4L2_PIX_FMT_SGRBG10:
+	case V4L2_PIX_FMT_SRGGB10:
+		isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_DAT10;
+		isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED16;
+		isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
+		isc->try_config.bpp = 16;
+		break;
+	case V4L2_PIX_FMT_SBGGR12:
+	case V4L2_PIX_FMT_SGBRG12:
+	case V4L2_PIX_FMT_SGRBG12:
+	case V4L2_PIX_FMT_SRGGB12:
+		isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_DAT12;
+		isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED16;
+		isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
+		isc->try_config.bpp = 16;
+		break;
+	case V4L2_PIX_FMT_RGB565:
+		isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_RGB565;
+		isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED16;
+		isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
+		isc->try_config.bpp = 16;
+		break;
+	case V4L2_PIX_FMT_ARGB444:
+		isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_ARGB444;
+		isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED16;
+		isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
+		isc->try_config.bpp = 16;
+		break;
+	case V4L2_PIX_FMT_ARGB555:
+		isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_ARGB555;
+		isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED16;
+		isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
+		isc->try_config.bpp = 16;
+		break;
+	case V4L2_PIX_FMT_ABGR32:
+	case V4L2_PIX_FMT_XBGR32:
+		isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_ARGB32;
+		isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED32;
+		isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
+		isc->try_config.bpp = 32;
+		break;
+	case V4L2_PIX_FMT_YUV420:
+		isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_YYCC;
+		isc->try_config.dcfg_imode = ISC_DCFG_IMODE_YC420P;
+		isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PLANAR;
+		isc->try_config.bpp = 12;
+		break;
+	case V4L2_PIX_FMT_YUV422P:
+		isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_YYCC;
+		isc->try_config.dcfg_imode = ISC_DCFG_IMODE_YC422P;
+		isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PLANAR;
+		isc->try_config.bpp = 16;
+		break;
+	case V4L2_PIX_FMT_YUYV:
+		isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_YYCC;
+		isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED32;
+		isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
+		isc->try_config.bpp = 16;
+		break;
+	case V4L2_PIX_FMT_GREY:
+		isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_DATY8;
+		isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED8;
+		isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
+		isc->try_config.bpp = 8;
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+/*
+ * Configuring pipeline modules, depending on which format the ISC outputs
+ * and considering which format it has as input from the sensor.
+ */
+static int isc_try_configure_pipeline(struct isc_device *isc)
+{
+	switch (isc->try_config.fourcc) {
+	case V4L2_PIX_FMT_RGB565:
+	case V4L2_PIX_FMT_ARGB555:
+	case V4L2_PIX_FMT_ARGB444:
+	case V4L2_PIX_FMT_ABGR32:
+	case V4L2_PIX_FMT_XBGR32:
+		/* if sensor format is RAW, we convert inside ISC */
+		if (ISC_IS_FORMAT_RAW(isc->try_config.sd_format->mbus_code)) {
+			isc->try_config.bits_pipeline = CFA_ENABLE |
+				WB_ENABLE | GAM_ENABLES;
+		} else {
+			isc->try_config.bits_pipeline = 0x0;
+		}
+		break;
+	case V4L2_PIX_FMT_YUV420:
+		/* if sensor format is RAW, we convert inside ISC */
+		if (ISC_IS_FORMAT_RAW(isc->try_config.sd_format->mbus_code)) {
+			isc->try_config.bits_pipeline = CFA_ENABLE |
+				CSC_ENABLE | WB_ENABLE | GAM_ENABLES |
+				SUB420_ENABLE | SUB422_ENABLE | CBC_ENABLE;
+		} else {
+			isc->try_config.bits_pipeline = 0x0;
+		}
+		break;
+	case V4L2_PIX_FMT_YUV422P:
+		/* if sensor format is RAW, we convert inside ISC */
+		if (ISC_IS_FORMAT_RAW(isc->try_config.sd_format->mbus_code)) {
+			isc->try_config.bits_pipeline = CFA_ENABLE |
+				CSC_ENABLE | WB_ENABLE | GAM_ENABLES |
+				SUB422_ENABLE | CBC_ENABLE;
+		} else {
+			isc->try_config.bits_pipeline = 0x0;
+		}
+		break;
+	case V4L2_PIX_FMT_YUYV:
+		/* if sensor format is RAW, we convert inside ISC */
+		if (ISC_IS_FORMAT_RAW(isc->try_config.sd_format->mbus_code)) {
+			isc->try_config.bits_pipeline = CFA_ENABLE |
+				CSC_ENABLE | WB_ENABLE | GAM_ENABLES |
+				SUB422_ENABLE | CBC_ENABLE;
+		} else {
+			isc->try_config.bits_pipeline = 0x0;
+		}
+		break;
+	case V4L2_PIX_FMT_GREY:
+		if (ISC_IS_FORMAT_RAW(isc->try_config.sd_format->mbus_code)) {
+		/* if sensor format is RAW, we convert inside ISC */
+			isc->try_config.bits_pipeline = CFA_ENABLE |
+				CSC_ENABLE | WB_ENABLE | GAM_ENABLES |
+				CBC_ENABLE;
+		} else {
+			isc->try_config.bits_pipeline = 0x0;
+		}
+		break;
+	default:
+		isc->try_config.bits_pipeline = 0x0;
+	}
+	return 0;
+}
+
+static int isc_try_fmt(struct isc_device *isc, struct v4l2_format *f,
+			u32 *code)
+{
+	int i;
+	struct isc_format *sd_fmt = NULL, *direct_fmt = NULL;
+	struct v4l2_pix_format *pixfmt = &f->fmt.pix;
+	struct v4l2_subdev_pad_config pad_cfg;
+	struct v4l2_subdev_format format = {
+		.which = V4L2_SUBDEV_FORMAT_TRY,
+	};
+	u32 mbus_code;
+	int ret;
+	bool rlp_dma_direct_dump = false;
+
+	if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+
+	/* Step 1: find a RAW format that is supported */
+	for (i = 0; i < isc->num_user_formats; i++) {
+		if (ISC_IS_FORMAT_RAW(isc->user_formats[i]->mbus_code)) {
+			sd_fmt = isc->user_formats[i];
+			break;
+		}
+	}
+	/* Step 2: We can continue with this RAW format, or we can look
+	 * for better: maybe sensor supports directly what we need.
+	 */
+	direct_fmt = find_format_by_fourcc(isc, pixfmt->pixelformat);
+
+	/* Step 3: We have both. We decide given the module parameter which
+	 * one to use.
+	 */
+	if (direct_fmt && sd_fmt && sensor_preferred)
+		sd_fmt = direct_fmt;
+
+	/* Step 4: we do not have RAW but we have a direct format. Use it. */
+	if (direct_fmt && !sd_fmt)
+		sd_fmt = direct_fmt;
+
+	/* Step 5: if we are using a direct format, we need to package
+	 * everything as 8 bit data and just dump it
+	 */
+	if (sd_fmt == direct_fmt)
+		rlp_dma_direct_dump = true;
+
+	/* Step 6: We have no format. This can happen if the userspace
+	 * requests some weird/invalid format.
+	 * In this case, default to whatever we have
+	 */
+	if (!sd_fmt && !direct_fmt) {
+		sd_fmt = isc->user_formats[isc->num_user_formats - 1];
+		v4l2_dbg(1, debug, &isc->v4l2_dev,
+			 "Sensor not supporting %.4s, using %.4s\n",
+			 (char *)&pixfmt->pixelformat, (char *)&sd_fmt->fourcc);
+	}
+
+	if (!sd_fmt) {
+		ret = -EINVAL;
+		goto isc_try_fmt_err;
+	}
+
+	/* Step 7: Print out what we decided for debugging */
+	v4l2_dbg(1, debug, &isc->v4l2_dev,
+		 "Preferring to have sensor using format %.4s\n",
+		 (char *)&sd_fmt->fourcc);
+
+	/* Step 8: at this moment we decided which format the subdev will use */
+	isc->try_config.sd_format = sd_fmt;
+
+	/* Limit to Atmel ISC hardware capabilities */
+	if (pixfmt->width > ISC_MAX_SUPPORT_WIDTH)
+		pixfmt->width = ISC_MAX_SUPPORT_WIDTH;
+	if (pixfmt->height > ISC_MAX_SUPPORT_HEIGHT)
+		pixfmt->height = ISC_MAX_SUPPORT_HEIGHT;
+
+	/*
+	 * The mbus format is the one the subdev outputs.
+	 * The pixels will be transferred in this format Sensor -> ISC
+	 */
+	mbus_code = sd_fmt->mbus_code;
+
+	/*
+	 * Validate formats. If the required format is not OK, default to raw.
+	 */
+
+	isc->try_config.fourcc = pixfmt->pixelformat;
+
+	if (isc_try_validate_formats(isc)) {
+		pixfmt->pixelformat = isc->try_config.fourcc = sd_fmt->fourcc;
+		/* Re-try to validate the new format */
+		ret = isc_try_validate_formats(isc);
+		if (ret)
+			goto isc_try_fmt_err;
+	}
+
+	ret = isc_try_configure_rlp_dma(isc, rlp_dma_direct_dump);
+	if (ret)
+		goto isc_try_fmt_err;
+
+	ret = isc_try_configure_pipeline(isc);
+	if (ret)
+		goto isc_try_fmt_err;
+
+	v4l2_fill_mbus_format(&format.format, pixfmt, mbus_code);
+	ret = v4l2_subdev_call(isc->current_subdev->sd, pad, set_fmt,
+			       &pad_cfg, &format);
+	if (ret < 0)
+		goto isc_try_fmt_subdev_err;
+
+	v4l2_fill_pix_format(pixfmt, &format.format);
+
+	pixfmt->field = V4L2_FIELD_NONE;
+	pixfmt->bytesperline = (pixfmt->width * isc->try_config.bpp) >> 3;
+	pixfmt->sizeimage = pixfmt->bytesperline * pixfmt->height;
+
+	if (code)
+		*code = mbus_code;
+
+	return 0;
+
+isc_try_fmt_err:
+	v4l2_err(&isc->v4l2_dev, "Could not find any possible format for a working pipeline\n");
+isc_try_fmt_subdev_err:
+	memset(&isc->try_config, 0, sizeof(isc->try_config));
+
+	return ret;
+}
+
+static int isc_set_fmt(struct isc_device *isc, struct v4l2_format *f)
+{
+	struct v4l2_subdev_format format = {
+		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
+	};
+	u32 mbus_code = 0;
+	int ret;
+
+	ret = isc_try_fmt(isc, f, &mbus_code);
+	if (ret)
+		return ret;
+
+	v4l2_fill_mbus_format(&format.format, &f->fmt.pix, mbus_code);
+	ret = v4l2_subdev_call(isc->current_subdev->sd, pad,
+			       set_fmt, NULL, &format);
+	if (ret < 0)
+		return ret;
+
+	isc->fmt = *f;
+
+	if (isc->try_config.sd_format && isc->config.sd_format &&
+	    isc->try_config.sd_format != isc->config.sd_format) {
+		isc->ctrls.hist_stat = HIST_INIT;
+		isc_reset_awb_ctrls(isc);
+	}
+	/* make the try configuration active */
+	isc->config = isc->try_config;
+
+	v4l2_dbg(1, debug, &isc->v4l2_dev, "New ISC configuration in place\n");
+
+	return 0;
+}
+
+static int isc_s_fmt_vid_cap(struct file *file, void *priv,
+			      struct v4l2_format *f)
+{
+	struct isc_device *isc = video_drvdata(file);
+
+	if (vb2_is_streaming(&isc->vb2_vidq))
+		return -EBUSY;
+
+	return isc_set_fmt(isc, f);
+}
+
+static int isc_try_fmt_vid_cap(struct file *file, void *priv,
+				struct v4l2_format *f)
+{
+	struct isc_device *isc = video_drvdata(file);
+
+	return isc_try_fmt(isc, f, NULL);
+}
+
+static int isc_enum_input(struct file *file, void *priv,
+			   struct v4l2_input *inp)
+{
+	if (inp->index != 0)
+		return -EINVAL;
+
+	inp->type = V4L2_INPUT_TYPE_CAMERA;
+	inp->std = 0;
+	strscpy(inp->name, "Camera", sizeof(inp->name));
+
+	return 0;
+}
+
+static int isc_g_input(struct file *file, void *priv, unsigned int *i)
+{
+	*i = 0;
+
+	return 0;
+}
+
+static int isc_s_input(struct file *file, void *priv, unsigned int i)
+{
+	if (i > 0)
+		return -EINVAL;
+
+	return 0;
+}
+
+static int isc_g_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
+{
+	struct isc_device *isc = video_drvdata(file);
+
+	return v4l2_g_parm_cap(video_devdata(file), isc->current_subdev->sd, a);
+}
+
+static int isc_s_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
+{
+	struct isc_device *isc = video_drvdata(file);
+
+	return v4l2_s_parm_cap(video_devdata(file), isc->current_subdev->sd, a);
+}
+
+static int isc_enum_framesizes(struct file *file, void *fh,
+			       struct v4l2_frmsizeenum *fsize)
+{
+	struct isc_device *isc = video_drvdata(file);
+	struct v4l2_subdev_frame_size_enum fse = {
+		.index = fsize->index,
+		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
+	};
+	int ret = -EINVAL;
+	int i;
+
+	for (i = 0; i < isc->num_user_formats; i++)
+		if (isc->user_formats[i]->fourcc == fsize->pixel_format)
+			ret = 0;
+
+	for (i = 0; i < ARRAY_SIZE(controller_formats); i++)
+		if (controller_formats[i].fourcc == fsize->pixel_format)
+			ret = 0;
+
+	if (ret)
+		return ret;
+
+	ret = v4l2_subdev_call(isc->current_subdev->sd, pad, enum_frame_size,
+			       NULL, &fse);
+	if (ret)
+		return ret;
+
+	fse.code = isc->config.sd_format->mbus_code;
+
+	fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
+	fsize->discrete.width = fse.max_width;
+	fsize->discrete.height = fse.max_height;
+
+	return 0;
+}
+
+static int isc_enum_frameintervals(struct file *file, void *fh,
+				    struct v4l2_frmivalenum *fival)
+{
+	struct isc_device *isc = video_drvdata(file);
+	struct v4l2_subdev_frame_interval_enum fie = {
+		.index = fival->index,
+		.width = fival->width,
+		.height = fival->height,
+		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
+	};
+	int ret = -EINVAL;
+	int i;
+
+	for (i = 0; i < isc->num_user_formats; i++)
+		if (isc->user_formats[i]->fourcc == fival->pixel_format)
+			ret = 0;
+
+	for (i = 0; i < ARRAY_SIZE(controller_formats); i++)
+		if (controller_formats[i].fourcc == fival->pixel_format)
+			ret = 0;
+
+	if (ret)
+		return ret;
+
+	ret = v4l2_subdev_call(isc->current_subdev->sd, pad,
+			       enum_frame_interval, NULL, &fie);
+	if (ret)
+		return ret;
+
+	fie.code = isc->config.sd_format->mbus_code;
+	fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
+	fival->discrete = fie.interval;
+
+	return 0;
+}
+
+static const struct v4l2_ioctl_ops isc_ioctl_ops = {
+	.vidioc_querycap		= isc_querycap,
+	.vidioc_enum_fmt_vid_cap	= isc_enum_fmt_vid_cap,
+	.vidioc_g_fmt_vid_cap		= isc_g_fmt_vid_cap,
+	.vidioc_s_fmt_vid_cap		= isc_s_fmt_vid_cap,
+	.vidioc_try_fmt_vid_cap		= isc_try_fmt_vid_cap,
+
+	.vidioc_enum_input		= isc_enum_input,
+	.vidioc_g_input			= isc_g_input,
+	.vidioc_s_input			= isc_s_input,
+
+	.vidioc_reqbufs			= vb2_ioctl_reqbufs,
+	.vidioc_querybuf		= vb2_ioctl_querybuf,
+	.vidioc_qbuf			= vb2_ioctl_qbuf,
+	.vidioc_expbuf			= vb2_ioctl_expbuf,
+	.vidioc_dqbuf			= vb2_ioctl_dqbuf,
+	.vidioc_create_bufs		= vb2_ioctl_create_bufs,
+	.vidioc_prepare_buf		= vb2_ioctl_prepare_buf,
+	.vidioc_streamon		= vb2_ioctl_streamon,
+	.vidioc_streamoff		= vb2_ioctl_streamoff,
+
+	.vidioc_g_parm			= isc_g_parm,
+	.vidioc_s_parm			= isc_s_parm,
+	.vidioc_enum_framesizes		= isc_enum_framesizes,
+	.vidioc_enum_frameintervals	= isc_enum_frameintervals,
+
+	.vidioc_log_status		= v4l2_ctrl_log_status,
+	.vidioc_subscribe_event		= v4l2_ctrl_subscribe_event,
+	.vidioc_unsubscribe_event	= v4l2_event_unsubscribe,
+};
+
+static int isc_open(struct file *file)
+{
+	struct isc_device *isc = video_drvdata(file);
+	struct v4l2_subdev *sd = isc->current_subdev->sd;
+	int ret;
+
+	if (mutex_lock_interruptible(&isc->lock))
+		return -ERESTARTSYS;
+
+	ret = v4l2_fh_open(file);
+	if (ret < 0)
+		goto unlock;
+
+	if (!v4l2_fh_is_singular_file(file))
+		goto unlock;
+
+	ret = v4l2_subdev_call(sd, core, s_power, 1);
+	if (ret < 0 && ret != -ENOIOCTLCMD) {
+		v4l2_fh_release(file);
+		goto unlock;
+	}
+
+	ret = isc_set_fmt(isc, &isc->fmt);
+	if (ret) {
+		v4l2_subdev_call(sd, core, s_power, 0);
+		v4l2_fh_release(file);
+	}
+
+unlock:
+	mutex_unlock(&isc->lock);
+	return ret;
+}
+
+static int isc_release(struct file *file)
+{
+	struct isc_device *isc = video_drvdata(file);
+	struct v4l2_subdev *sd = isc->current_subdev->sd;
+	bool fh_singular;
+	int ret;
+
+	mutex_lock(&isc->lock);
+
+	fh_singular = v4l2_fh_is_singular_file(file);
+
+	ret = _vb2_fop_release(file, NULL);
+
+	if (fh_singular)
+		v4l2_subdev_call(sd, core, s_power, 0);
+
+	mutex_unlock(&isc->lock);
+
+	return ret;
+}
+
+static const struct v4l2_file_operations isc_fops = {
+	.owner		= THIS_MODULE,
+	.open		= isc_open,
+	.release	= isc_release,
+	.unlocked_ioctl	= video_ioctl2,
+	.read		= vb2_fop_read,
+	.mmap		= vb2_fop_mmap,
+	.poll		= vb2_fop_poll,
+};
+
+irqreturn_t isc_interrupt(int irq, void *dev_id)
+{
+	struct isc_device *isc = (struct isc_device *)dev_id;
+	struct regmap *regmap = isc->regmap;
+	u32 isc_intsr, isc_intmask, pending;
+	irqreturn_t ret = IRQ_NONE;
+
+	regmap_read(regmap, ISC_INTSR, &isc_intsr);
+	regmap_read(regmap, ISC_INTMASK, &isc_intmask);
+
+	pending = isc_intsr & isc_intmask;
+
+	if (likely(pending & ISC_INT_DDONE)) {
+		spin_lock(&isc->dma_queue_lock);
+		if (isc->cur_frm) {
+			struct vb2_v4l2_buffer *vbuf = &isc->cur_frm->vb;
+			struct vb2_buffer *vb = &vbuf->vb2_buf;
+
+			vb->timestamp = ktime_get_ns();
+			vbuf->sequence = isc->sequence++;
+			vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
+			isc->cur_frm = NULL;
+		}
+
+		if (!list_empty(&isc->dma_queue) && !isc->stop) {
+			isc->cur_frm = list_first_entry(&isc->dma_queue,
+						     struct isc_buffer, list);
+			list_del(&isc->cur_frm->list);
+
+			isc_start_dma(isc);
+		}
+
+		if (isc->stop)
+			complete(&isc->comp);
+
+		ret = IRQ_HANDLED;
+		spin_unlock(&isc->dma_queue_lock);
+	}
+
+	if (pending & ISC_INT_HISDONE) {
+		schedule_work(&isc->awb_work);
+		ret = IRQ_HANDLED;
+	}
+
+	return ret;
+}
+
+static void isc_hist_count(struct isc_device *isc, u32 *min, u32 *max)
+{
+	struct regmap *regmap = isc->regmap;
+	struct isc_ctrls *ctrls = &isc->ctrls;
+	u32 *hist_count = &ctrls->hist_count[ctrls->hist_id];
+	u32 *hist_entry = &ctrls->hist_entry[0];
+	u32 i;
+
+	*min = 0;
+	*max = HIST_ENTRIES;
+
+	regmap_bulk_read(regmap, ISC_HIS_ENTRY, hist_entry, HIST_ENTRIES);
+
+	*hist_count = 0;
+	/*
+	 * we deliberately ignore the end of the histogram,
+	 * the most white pixels
+	 */
+	for (i = 1; i < HIST_ENTRIES; i++) {
+		if (*hist_entry && !*min)
+			*min = i;
+		if (*hist_entry)
+			*max = i;
+		*hist_count += i * (*hist_entry++);
+	}
+
+	if (!*min)
+		*min = 1;
+}
+
+static void isc_wb_update(struct isc_ctrls *ctrls)
+{
+	u32 *hist_count = &ctrls->hist_count[0];
+	u32 c, offset[4];
+	u64 avg = 0;
+	/* We compute two gains, stretch gain and grey world gain */
+	u32 s_gain[4], gw_gain[4];
+
+	/*
+	 * According to Grey World, we need to set gains for R/B to normalize
+	 * them towards the green channel.
+	 * Thus we want to keep Green as fixed and adjust only Red/Blue
+	 * Compute the average of the both green channels first
+	 */
+	avg = (u64)hist_count[ISC_HIS_CFG_MODE_GR] +
+		(u64)hist_count[ISC_HIS_CFG_MODE_GB];
+	avg >>= 1;
+
+	/* Green histogram is null, nothing to do */
+	if (!avg)
+		return;
+
+	for (c = ISC_HIS_CFG_MODE_GR; c <= ISC_HIS_CFG_MODE_B; c++) {
+		/*
+		 * the color offset is the minimum value of the histogram.
+		 * we stretch this color to the full range by substracting
+		 * this value from the color component.
+		 */
+		offset[c] = ctrls->hist_minmax[c][HIST_MIN_INDEX];
+		/*
+		 * The offset is always at least 1. If the offset is 1, we do
+		 * not need to adjust it, so our result must be zero.
+		 * the offset is computed in a histogram on 9 bits (0..512)
+		 * but the offset in register is based on
+		 * 12 bits pipeline (0..4096).
+		 * we need to shift with the 3 bits that the histogram is
+		 * ignoring
+		 */
+		ctrls->offset[c] = (offset[c] - 1) << 3;
+
+		/* the offset is then taken and converted to 2's complements */
+		if (!ctrls->offset[c])
+			ctrls->offset[c] = ISC_WB_O_ZERO_VAL;
+
+		/*
+		 * the stretch gain is the total number of histogram bins
+		 * divided by the actual range of color component (Max - Min)
+		 * If we compute gain like this, the actual color component
+		 * will be stretched to the full histogram.
+		 * We need to shift 9 bits for precision, we have 9 bits for
+		 * decimals
+		 */
+		s_gain[c] = (HIST_ENTRIES << 9) /
+			(ctrls->hist_minmax[c][HIST_MAX_INDEX] -
+			ctrls->hist_minmax[c][HIST_MIN_INDEX] + 1);
+
+		/*
+		 * Now we have to compute the gain w.r.t. the average.
+		 * Add/lose gain to the component towards the average.
+		 * If it happens that the component is zero, use the
+		 * fixed point value : 1.0 gain.
+		 */
+		if (hist_count[c])
+			gw_gain[c] = div_u64(avg << 9, hist_count[c]);
+		else
+			gw_gain[c] = 1 << 9;
+
+		/* multiply both gains and adjust for decimals */
+		ctrls->gain[c] = s_gain[c] * gw_gain[c];
+		ctrls->gain[c] >>= 9;
+	}
+}
+
+static void isc_awb_work(struct work_struct *w)
+{
+	struct isc_device *isc =
+		container_of(w, struct isc_device, awb_work);
+	struct regmap *regmap = isc->regmap;
+	struct isc_ctrls *ctrls = &isc->ctrls;
+	u32 hist_id = ctrls->hist_id;
+	u32 baysel;
+	unsigned long flags;
+	u32 min, max;
+
+	/* streaming is not active anymore */
+	if (isc->stop)
+		return;
+
+	if (ctrls->hist_stat != HIST_ENABLED)
+		return;
+
+	isc_hist_count(isc, &min, &max);
+	ctrls->hist_minmax[hist_id][HIST_MIN_INDEX] = min;
+	ctrls->hist_minmax[hist_id][HIST_MAX_INDEX] = max;
+
+	if (hist_id != ISC_HIS_CFG_MODE_B) {
+		hist_id++;
+	} else {
+		isc_wb_update(ctrls);
+		hist_id = ISC_HIS_CFG_MODE_GR;
+	}
+
+	ctrls->hist_id = hist_id;
+	baysel = isc->config.sd_format->cfa_baycfg << ISC_HIS_CFG_BAYSEL_SHIFT;
+
+	/* if no more auto white balance, reset controls. */
+	if (ctrls->awb == ISC_WB_NONE)
+		isc_reset_awb_ctrls(isc);
+
+	pm_runtime_get_sync(isc->dev);
+
+	/*
+	 * only update if we have all the required histograms and controls
+	 * if awb has been disabled, we need to reset registers as well.
+	 */
+	if (hist_id == ISC_HIS_CFG_MODE_GR || ctrls->awb == ISC_WB_NONE) {
+		/*
+		 * It may happen that DMA Done IRQ will trigger while we are
+		 * updating white balance registers here.
+		 * In that case, only parts of the controls have been updated.
+		 * We can avoid that by locking the section.
+		 */
+		spin_lock_irqsave(&isc->awb_lock, flags);
+		isc_update_awb_ctrls(isc);
+		spin_unlock_irqrestore(&isc->awb_lock, flags);
+
+		/*
+		 * if we are doing just the one time white balance adjustment,
+		 * we are basically done.
+		 */
+		if (ctrls->awb == ISC_WB_ONETIME) {
+			v4l2_info(&isc->v4l2_dev,
+				  "Completed one time white-balance adjustment.\n");
+			ctrls->awb = ISC_WB_NONE;
+		}
+	}
+	regmap_write(regmap, ISC_HIS_CFG, hist_id | baysel | ISC_HIS_CFG_RAR);
+	isc_update_profile(isc);
+	/* if awb has been disabled, we don't need to start another histogram */
+	if (ctrls->awb)
+		regmap_write(regmap, ISC_CTRLEN, ISC_CTRL_HISREQ);
+
+	pm_runtime_put_sync(isc->dev);
+}
+
+static int isc_s_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct isc_device *isc = container_of(ctrl->handler,
+					     struct isc_device, ctrls.handler);
+	struct isc_ctrls *ctrls = &isc->ctrls;
+
+	if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
+		return 0;
+
+	switch (ctrl->id) {
+	case V4L2_CID_BRIGHTNESS:
+		ctrls->brightness = ctrl->val & ISC_CBC_BRIGHT_MASK;
+		break;
+	case V4L2_CID_CONTRAST:
+		ctrls->contrast = ctrl->val & ISC_CBC_CONTRAST_MASK;
+		break;
+	case V4L2_CID_GAMMA:
+		ctrls->gamma_index = ctrl->val;
+		break;
+	case V4L2_CID_AUTO_WHITE_BALANCE:
+		if (ctrl->val == 1)
+			ctrls->awb = ISC_WB_AUTO;
+		else
+			ctrls->awb = ISC_WB_NONE;
+
+		/* we did not configure ISC yet */
+		if (!isc->config.sd_format)
+			break;
+
+		if (ctrls->hist_stat != HIST_ENABLED)
+			isc_reset_awb_ctrls(isc);
+
+		if (isc->ctrls.awb == ISC_WB_AUTO &&
+		    vb2_is_streaming(&isc->vb2_vidq) &&
+		    ISC_IS_FORMAT_RAW(isc->config.sd_format->mbus_code))
+			isc_set_histogram(isc, true);
+
+		break;
+	case V4L2_CID_DO_WHITE_BALANCE:
+		/* if AWB is enabled, do nothing */
+		if (ctrls->awb == ISC_WB_AUTO)
+			return 0;
+
+		ctrls->awb = ISC_WB_ONETIME;
+		isc_set_histogram(isc, true);
+		v4l2_dbg(1, debug, &isc->v4l2_dev,
+			 "One time white-balance started.\n");
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static const struct v4l2_ctrl_ops isc_ctrl_ops = {
+	.s_ctrl	= isc_s_ctrl,
+};
+
+static int isc_ctrl_init(struct isc_device *isc)
+{
+	const struct v4l2_ctrl_ops *ops = &isc_ctrl_ops;
+	struct isc_ctrls *ctrls = &isc->ctrls;
+	struct v4l2_ctrl_handler *hdl = &ctrls->handler;
+	int ret;
+
+	ctrls->hist_stat = HIST_INIT;
+	isc_reset_awb_ctrls(isc);
+
+	ret = v4l2_ctrl_handler_init(hdl, 5);
+	if (ret < 0)
+		return ret;
+
+	ctrls->brightness = 0;
+	ctrls->contrast = 256;
+
+	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_BRIGHTNESS, -1024, 1023, 1, 0);
+	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_CONTRAST, -2048, 2047, 1, 256);
+	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_GAMMA, 0, GAMMA_MAX, 1, 2);
+	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_AUTO_WHITE_BALANCE, 0, 1, 1, 1);
+
+	/* do_white_balance is a button, so min,max,step,default are ignored */
+	isc->do_wb_ctrl = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_DO_WHITE_BALANCE,
+					    0, 0, 0, 0);
+
+	v4l2_ctrl_activate(isc->do_wb_ctrl, false);
+
+	v4l2_ctrl_handler_setup(hdl);
+
+	return 0;
+}
+
+static int isc_async_bound(struct v4l2_async_notifier *notifier,
+			    struct v4l2_subdev *subdev,
+			    struct v4l2_async_subdev *asd)
+{
+	struct isc_device *isc = container_of(notifier->v4l2_dev,
+					      struct isc_device, v4l2_dev);
+	struct isc_subdev_entity *subdev_entity =
+		container_of(notifier, struct isc_subdev_entity, notifier);
+
+	if (video_is_registered(&isc->video_dev)) {
+		v4l2_err(&isc->v4l2_dev, "only supports one sub-device.\n");
+		return -EBUSY;
+	}
+
+	subdev_entity->sd = subdev;
+
+	return 0;
+}
+
+static void isc_async_unbind(struct v4l2_async_notifier *notifier,
+			      struct v4l2_subdev *subdev,
+			      struct v4l2_async_subdev *asd)
+{
+	struct isc_device *isc = container_of(notifier->v4l2_dev,
+					      struct isc_device, v4l2_dev);
+	cancel_work_sync(&isc->awb_work);
+	video_unregister_device(&isc->video_dev);
+	v4l2_ctrl_handler_free(&isc->ctrls.handler);
+}
+
+static struct isc_format *find_format_by_code(unsigned int code, int *index)
+{
+	struct isc_format *fmt = &formats_list[0];
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(formats_list); i++) {
+		if (fmt->mbus_code == code) {
+			*index = i;
+			return fmt;
+		}
+
+		fmt++;
+	}
+
+	return NULL;
+}
+
+static int isc_formats_init(struct isc_device *isc)
+{
+	struct isc_format *fmt;
+	struct v4l2_subdev *subdev = isc->current_subdev->sd;
+	unsigned int num_fmts, i, j;
+	u32 list_size = ARRAY_SIZE(formats_list);
+	struct v4l2_subdev_mbus_code_enum mbus_code = {
+		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
+	};
+
+	num_fmts = 0;
+	while (!v4l2_subdev_call(subdev, pad, enum_mbus_code,
+	       NULL, &mbus_code)) {
+		mbus_code.index++;
+
+		fmt = find_format_by_code(mbus_code.code, &i);
+		if (!fmt) {
+			v4l2_warn(&isc->v4l2_dev, "Mbus code %x not supported\n",
+				  mbus_code.code);
+			continue;
+		}
+
+		fmt->sd_support = true;
+		num_fmts++;
+	}
+
+	if (!num_fmts)
+		return -ENXIO;
+
+	isc->num_user_formats = num_fmts;
+	isc->user_formats = devm_kcalloc(isc->dev,
+					 num_fmts, sizeof(*isc->user_formats),
+					 GFP_KERNEL);
+	if (!isc->user_formats)
+		return -ENOMEM;
+
+	fmt = &formats_list[0];
+	for (i = 0, j = 0; i < list_size; i++) {
+		if (fmt->sd_support)
+			isc->user_formats[j++] = fmt;
+		fmt++;
+	}
+
+	return 0;
+}
+
+static int isc_set_default_fmt(struct isc_device *isc)
+{
+	struct v4l2_format f = {
+		.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
+		.fmt.pix = {
+			.width		= VGA_WIDTH,
+			.height		= VGA_HEIGHT,
+			.field		= V4L2_FIELD_NONE,
+			.pixelformat	= isc->user_formats[0]->fourcc,
+		},
+	};
+	int ret;
+
+	ret = isc_try_fmt(isc, &f, NULL);
+	if (ret)
+		return ret;
+
+	isc->fmt = f;
+	return 0;
+}
+
+static int isc_async_complete(struct v4l2_async_notifier *notifier)
+{
+	struct isc_device *isc = container_of(notifier->v4l2_dev,
+					      struct isc_device, v4l2_dev);
+	struct video_device *vdev = &isc->video_dev;
+	struct vb2_queue *q = &isc->vb2_vidq;
+	int ret;
+
+	INIT_WORK(&isc->awb_work, isc_awb_work);
+
+	ret = v4l2_device_register_subdev_nodes(&isc->v4l2_dev);
+	if (ret < 0) {
+		v4l2_err(&isc->v4l2_dev, "Failed to register subdev nodes\n");
+		return ret;
+	}
+
+	isc->current_subdev = container_of(notifier,
+					   struct isc_subdev_entity, notifier);
+	mutex_init(&isc->lock);
+	init_completion(&isc->comp);
+
+	/* Initialize videobuf2 queue */
+	q->type			= V4L2_BUF_TYPE_VIDEO_CAPTURE;
+	q->io_modes		= VB2_MMAP | VB2_DMABUF | VB2_READ;
+	q->drv_priv		= isc;
+	q->buf_struct_size	= sizeof(struct isc_buffer);
+	q->ops			= &isc_vb2_ops;
+	q->mem_ops		= &vb2_dma_contig_memops;
+	q->timestamp_flags	= V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
+	q->lock			= &isc->lock;
+	q->min_buffers_needed	= 1;
+	q->dev			= isc->dev;
+
+	ret = vb2_queue_init(q);
+	if (ret < 0) {
+		v4l2_err(&isc->v4l2_dev,
+			 "vb2_queue_init() failed: %d\n", ret);
+		return ret;
+	}
+
+	/* Init video dma queues */
+	INIT_LIST_HEAD(&isc->dma_queue);
+	spin_lock_init(&isc->dma_queue_lock);
+	spin_lock_init(&isc->awb_lock);
+
+	ret = isc_formats_init(isc);
+	if (ret < 0) {
+		v4l2_err(&isc->v4l2_dev,
+			 "Init format failed: %d\n", ret);
+		return ret;
+	}
+
+	ret = isc_set_default_fmt(isc);
+	if (ret) {
+		v4l2_err(&isc->v4l2_dev, "Could not set default format\n");
+		return ret;
+	}
+
+	ret = isc_ctrl_init(isc);
+	if (ret) {
+		v4l2_err(&isc->v4l2_dev, "Init isc ctrols failed: %d\n", ret);
+		return ret;
+	}
+
+	/* Register video device */
+	strscpy(vdev->name, ATMEL_ISC_NAME, sizeof(vdev->name));
+	vdev->release		= video_device_release_empty;
+	vdev->fops		= &isc_fops;
+	vdev->ioctl_ops		= &isc_ioctl_ops;
+	vdev->v4l2_dev		= &isc->v4l2_dev;
+	vdev->vfl_dir		= VFL_DIR_RX;
+	vdev->queue		= q;
+	vdev->lock		= &isc->lock;
+	vdev->ctrl_handler	= &isc->ctrls.handler;
+	vdev->device_caps	= V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_CAPTURE;
+	video_set_drvdata(vdev, isc);
+
+	ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
+	if (ret < 0) {
+		v4l2_err(&isc->v4l2_dev,
+			 "video_register_device failed: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+const struct v4l2_async_notifier_operations isc_async_ops = {
+	.bound = isc_async_bound,
+	.unbind = isc_async_unbind,
+	.complete = isc_async_complete,
+};
+
+void isc_subdev_cleanup(struct isc_device *isc)
+{
+	struct isc_subdev_entity *subdev_entity;
+
+	list_for_each_entry(subdev_entity, &isc->subdev_entities, list) {
+		v4l2_async_notifier_unregister(&subdev_entity->notifier);
+		v4l2_async_notifier_cleanup(&subdev_entity->notifier);
+	}
+
+	INIT_LIST_HEAD(&isc->subdev_entities);
+}
+
+int isc_pipeline_init(struct isc_device *isc)
+{
+	struct device *dev = isc->dev;
+	struct regmap *regmap = isc->regmap;
+	struct regmap_field *regs;
+	unsigned int i;
+
+	/* WB-->CFA-->CC-->GAM-->CSC-->CBC-->SUB422-->SUB420 */
+	const struct reg_field regfields[ISC_PIPE_LINE_NODE_NUM] = {
+		REG_FIELD(ISC_WB_CTRL, 0, 0),
+		REG_FIELD(ISC_CFA_CTRL, 0, 0),
+		REG_FIELD(ISC_CC_CTRL, 0, 0),
+		REG_FIELD(ISC_GAM_CTRL, 0, 0),
+		REG_FIELD(ISC_GAM_CTRL, 1, 1),
+		REG_FIELD(ISC_GAM_CTRL, 2, 2),
+		REG_FIELD(ISC_GAM_CTRL, 3, 3),
+		REG_FIELD(ISC_CSC_CTRL, 0, 0),
+		REG_FIELD(ISC_CBC_CTRL, 0, 0),
+		REG_FIELD(ISC_SUB422_CTRL, 0, 0),
+		REG_FIELD(ISC_SUB420_CTRL, 0, 0),
+	};
+
+	for (i = 0; i < ISC_PIPE_LINE_NODE_NUM; i++) {
+		regs = devm_regmap_field_alloc(dev, regmap, regfields[i]);
+		if (IS_ERR(regs))
+			return PTR_ERR(regs);
+
+		isc->pipeline[i] =  regs;
+	}
+
+	return 0;
+}
+
+/* regmap configuration */
+#define ATMEL_ISC_REG_MAX    0xbfc
+const struct regmap_config isc_regmap_config = {
+	.reg_bits       = 32,
+	.reg_stride     = 4,
+	.val_bits       = 32,
+	.max_register	= ATMEL_ISC_REG_MAX,
+};
+
diff --git a/drivers/media/platform/atmel/atmel-isc.c b/drivers/media/platform/atmel/atmel-isc.c
deleted file mode 100644
index da3b441..0000000
--- a/drivers/media/platform/atmel/atmel-isc.c
+++ /dev/null
@@ -1,2634 +0,0 @@
-/*
- * Atmel Image Sensor Controller (ISC) driver
- *
- * Copyright (C) 2016 Atmel
- *
- * Author: Songjun Wu <songjun.wu@xxxxxxxxxxxxx>
- *
- * This program is free software; you may redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; version 2 of the License.
- *
- * Sensor-->PFE-->WB-->CFA-->CC-->GAM-->CSC-->CBC-->SUB-->RLP-->DMA
- *
- * ISC video pipeline integrates the following submodules:
- * PFE: Parallel Front End to sample the camera sensor input stream
- *  WB: Programmable white balance in the Bayer domain
- * CFA: Color filter array interpolation module
- *  CC: Programmable color correction
- * GAM: Gamma correction
- * CSC: Programmable color space conversion
- * CBC: Contrast and Brightness control
- * SUB: This module performs YCbCr444 to YCbCr420 chrominance subsampling
- * RLP: This module performs rounding, range limiting
- *      and packing of the incoming data
- */
-
-#include <linux/clk.h>
-#include <linux/clkdev.h>
-#include <linux/clk-provider.h>
-#include <linux/delay.h>
-#include <linux/interrupt.h>
-#include <linux/math64.h>
-#include <linux/module.h>
-#include <linux/of.h>
-#include <linux/of_graph.h>
-#include <linux/platform_device.h>
-#include <linux/pm_runtime.h>
-#include <linux/regmap.h>
-#include <linux/videodev2.h>
-
-#include <media/v4l2-ctrls.h>
-#include <media/v4l2-device.h>
-#include <media/v4l2-event.h>
-#include <media/v4l2-image-sizes.h>
-#include <media/v4l2-ioctl.h>
-#include <media/v4l2-fwnode.h>
-#include <media/v4l2-subdev.h>
-#include <media/videobuf2-dma-contig.h>
-
-#include "atmel-isc-regs.h"
-
-#define ATMEL_ISC_NAME		"atmel_isc"
-
-#define ISC_MAX_SUPPORT_WIDTH   2592
-#define ISC_MAX_SUPPORT_HEIGHT  1944
-
-#define ISC_CLK_MAX_DIV		255
-
-enum isc_clk_id {
-	ISC_ISPCK = 0,
-	ISC_MCK = 1,
-};
-
-struct isc_clk {
-	struct clk_hw   hw;
-	struct clk      *clk;
-	struct regmap   *regmap;
-	spinlock_t	lock;
-	u8		id;
-	u8		parent_id;
-	u32		div;
-	struct device	*dev;
-};
-
-#define to_isc_clk(hw) container_of(hw, struct isc_clk, hw)
-
-struct isc_buffer {
-	struct vb2_v4l2_buffer  vb;
-	struct list_head	list;
-};
-
-struct isc_subdev_entity {
-	struct v4l2_subdev		*sd;
-	struct v4l2_async_subdev	*asd;
-	struct v4l2_async_notifier      notifier;
-
-	u32 pfe_cfg0;
-
-	struct list_head list;
-};
-
-/*
- * struct isc_format - ISC media bus format information
-			This structure represents the interface between the ISC
-			and the sensor. It's the input format received by
-			the ISC.
- * @fourcc:		Fourcc code for this format
- * @mbus_code:		V4L2 media bus format code.
- * @cfa_baycfg:		If this format is RAW BAYER, indicate the type of bayer.
-			this is either BGBG, RGRG, etc.
- * @pfe_cfg0_bps:	Number of hardware data lines connected to the ISC
- */
-
-struct isc_format {
-	u32	fourcc;
-	u32	mbus_code;
-	u32	cfa_baycfg;
-
-	bool	sd_support;
-	u32	pfe_cfg0_bps;
-};
-
-/* Pipeline bitmap */
-#define WB_ENABLE	BIT(0)
-#define CFA_ENABLE	BIT(1)
-#define CC_ENABLE	BIT(2)
-#define GAM_ENABLE	BIT(3)
-#define GAM_BENABLE	BIT(4)
-#define GAM_GENABLE	BIT(5)
-#define GAM_RENABLE	BIT(6)
-#define CSC_ENABLE	BIT(7)
-#define CBC_ENABLE	BIT(8)
-#define SUB422_ENABLE	BIT(9)
-#define SUB420_ENABLE	BIT(10)
-
-#define GAM_ENABLES	(GAM_RENABLE | GAM_GENABLE | GAM_BENABLE | GAM_ENABLE)
-
-/*
- * struct fmt_config - ISC format configuration and internal pipeline
-			This structure represents the internal configuration
-			of the ISC.
-			It also holds the format that ISC will present to v4l2.
- * @sd_format:		Pointer to an isc_format struct that holds the sensor
-			configuration.
- * @fourcc:		Fourcc code for this format.
- * @bpp:		Bytes per pixel in the current format.
- * @rlp_cfg_mode:	Configuration of the RLP (rounding, limiting packaging)
- * @dcfg_imode:		Configuration of the input of the DMA module
- * @dctrl_dview:	Configuration of the output of the DMA module
- * @bits_pipeline:	Configuration of the pipeline, which modules are enabled
- */
-struct fmt_config {
-	struct isc_format	*sd_format;
-
-	u32			fourcc;
-	u8			bpp;
-
-	u32			rlp_cfg_mode;
-	u32			dcfg_imode;
-	u32			dctrl_dview;
-
-	u32			bits_pipeline;
-};
-
-#define HIST_ENTRIES		512
-#define HIST_BAYER		(ISC_HIS_CFG_MODE_B + 1)
-
-enum{
-	HIST_INIT = 0,
-	HIST_ENABLED,
-	HIST_DISABLED,
-};
-
-struct isc_ctrls {
-	struct v4l2_ctrl_handler handler;
-
-	u32 brightness;
-	u32 contrast;
-	u8 gamma_index;
-#define ISC_WB_NONE	0
-#define ISC_WB_AUTO	1
-#define ISC_WB_ONETIME	2
-	u8 awb;
-
-	/* one for each component : GR, R, GB, B */
-	u32 gain[HIST_BAYER];
-	u32 offset[HIST_BAYER];
-
-	u32 hist_entry[HIST_ENTRIES];
-	u32 hist_count[HIST_BAYER];
-	u8 hist_id;
-	u8 hist_stat;
-#define HIST_MIN_INDEX		0
-#define HIST_MAX_INDEX		1
-	u32 hist_minmax[HIST_BAYER][2];
-};
-
-#define ISC_PIPE_LINE_NODE_NUM	11
-
-struct isc_device {
-	struct regmap		*regmap;
-	struct clk		*hclock;
-	struct clk		*ispck;
-	struct isc_clk		isc_clks[2];
-
-	struct device		*dev;
-	struct v4l2_device	v4l2_dev;
-	struct video_device	video_dev;
-
-	struct vb2_queue	vb2_vidq;
-	spinlock_t		dma_queue_lock;
-	struct list_head	dma_queue;
-	struct isc_buffer	*cur_frm;
-	unsigned int		sequence;
-	bool			stop;
-	struct completion	comp;
-
-	struct v4l2_format	fmt;
-	struct isc_format	**user_formats;
-	unsigned int		num_user_formats;
-
-	struct fmt_config	config;
-	struct fmt_config	try_config;
-
-	struct isc_ctrls	ctrls;
-	struct v4l2_ctrl	*do_wb_ctrl;
-	struct work_struct	awb_work;
-
-	struct mutex		lock;
-	spinlock_t		awb_lock;
-
-	struct regmap_field	*pipeline[ISC_PIPE_LINE_NODE_NUM];
-
-	struct isc_subdev_entity	*current_subdev;
-	struct list_head		subdev_entities;
-};
-
-/* This is a list of the formats that the ISC can *output* */
-static struct isc_format controller_formats[] = {
-	{
-		.fourcc		= V4L2_PIX_FMT_ARGB444,
-	},
-	{
-		.fourcc		= V4L2_PIX_FMT_ARGB555,
-	},
-	{
-		.fourcc		= V4L2_PIX_FMT_RGB565,
-	},
-	{
-		.fourcc		= V4L2_PIX_FMT_ABGR32,
-	},
-	{
-		.fourcc		= V4L2_PIX_FMT_XBGR32,
-	},
-	{
-		.fourcc		= V4L2_PIX_FMT_YUV420,
-	},
-	{
-		.fourcc		= V4L2_PIX_FMT_YUYV,
-	},
-	{
-		.fourcc		= V4L2_PIX_FMT_YUV422P,
-	},
-	{
-		.fourcc		= V4L2_PIX_FMT_GREY,
-	},
-};
-
-/* This is a list of formats that the ISC can receive as *input* */
-static struct isc_format formats_list[] = {
-	{
-		.fourcc		= V4L2_PIX_FMT_SBGGR8,
-		.mbus_code	= MEDIA_BUS_FMT_SBGGR8_1X8,
-		.pfe_cfg0_bps	= ISC_PFE_CFG0_BPS_EIGHT,
-		.cfa_baycfg	= ISC_BAY_CFG_BGBG,
-	},
-	{
-		.fourcc		= V4L2_PIX_FMT_SGBRG8,
-		.mbus_code	= MEDIA_BUS_FMT_SGBRG8_1X8,
-		.pfe_cfg0_bps	= ISC_PFE_CFG0_BPS_EIGHT,
-		.cfa_baycfg	= ISC_BAY_CFG_GBGB,
-	},
-	{
-		.fourcc		= V4L2_PIX_FMT_SGRBG8,
-		.mbus_code	= MEDIA_BUS_FMT_SGRBG8_1X8,
-		.pfe_cfg0_bps	= ISC_PFE_CFG0_BPS_EIGHT,
-		.cfa_baycfg	= ISC_BAY_CFG_GRGR,
-	},
-	{
-		.fourcc		= V4L2_PIX_FMT_SRGGB8,
-		.mbus_code	= MEDIA_BUS_FMT_SRGGB8_1X8,
-		.pfe_cfg0_bps	= ISC_PFE_CFG0_BPS_EIGHT,
-		.cfa_baycfg	= ISC_BAY_CFG_RGRG,
-	},
-	{
-		.fourcc		= V4L2_PIX_FMT_SBGGR10,
-		.mbus_code	= MEDIA_BUS_FMT_SBGGR10_1X10,
-		.pfe_cfg0_bps	= ISC_PFG_CFG0_BPS_TEN,
-		.cfa_baycfg	= ISC_BAY_CFG_RGRG,
-	},
-	{
-		.fourcc		= V4L2_PIX_FMT_SGBRG10,
-		.mbus_code	= MEDIA_BUS_FMT_SGBRG10_1X10,
-		.pfe_cfg0_bps	= ISC_PFG_CFG0_BPS_TEN,
-		.cfa_baycfg	= ISC_BAY_CFG_GBGB,
-	},
-	{
-		.fourcc		= V4L2_PIX_FMT_SGRBG10,
-		.mbus_code	= MEDIA_BUS_FMT_SGRBG10_1X10,
-		.pfe_cfg0_bps	= ISC_PFG_CFG0_BPS_TEN,
-		.cfa_baycfg	= ISC_BAY_CFG_GRGR,
-	},
-	{
-		.fourcc		= V4L2_PIX_FMT_SRGGB10,
-		.mbus_code	= MEDIA_BUS_FMT_SRGGB10_1X10,
-		.pfe_cfg0_bps	= ISC_PFG_CFG0_BPS_TEN,
-		.cfa_baycfg	= ISC_BAY_CFG_RGRG,
-	},
-	{
-		.fourcc		= V4L2_PIX_FMT_SBGGR12,
-		.mbus_code	= MEDIA_BUS_FMT_SBGGR12_1X12,
-		.pfe_cfg0_bps	= ISC_PFG_CFG0_BPS_TWELVE,
-		.cfa_baycfg	= ISC_BAY_CFG_BGBG,
-	},
-	{
-		.fourcc		= V4L2_PIX_FMT_SGBRG12,
-		.mbus_code	= MEDIA_BUS_FMT_SGBRG12_1X12,
-		.pfe_cfg0_bps	= ISC_PFG_CFG0_BPS_TWELVE,
-		.cfa_baycfg	= ISC_BAY_CFG_GBGB,
-	},
-	{
-		.fourcc		= V4L2_PIX_FMT_SGRBG12,
-		.mbus_code	= MEDIA_BUS_FMT_SGRBG12_1X12,
-		.pfe_cfg0_bps	= ISC_PFG_CFG0_BPS_TWELVE,
-		.cfa_baycfg	= ISC_BAY_CFG_GRGR,
-	},
-	{
-		.fourcc		= V4L2_PIX_FMT_SRGGB12,
-		.mbus_code	= MEDIA_BUS_FMT_SRGGB12_1X12,
-		.pfe_cfg0_bps	= ISC_PFG_CFG0_BPS_TWELVE,
-		.cfa_baycfg	= ISC_BAY_CFG_RGRG,
-	},
-	{
-		.fourcc		= V4L2_PIX_FMT_GREY,
-		.mbus_code	= MEDIA_BUS_FMT_Y8_1X8,
-		.pfe_cfg0_bps	= ISC_PFE_CFG0_BPS_EIGHT,
-	},
-	{
-		.fourcc		= V4L2_PIX_FMT_YUYV,
-		.mbus_code	= MEDIA_BUS_FMT_YUYV8_2X8,
-		.pfe_cfg0_bps	= ISC_PFE_CFG0_BPS_EIGHT,
-	},
-	{
-		.fourcc		= V4L2_PIX_FMT_RGB565,
-		.mbus_code	= MEDIA_BUS_FMT_RGB565_2X8_LE,
-		.pfe_cfg0_bps	= ISC_PFE_CFG0_BPS_EIGHT,
-	},
-};
-
-#define GAMMA_MAX	2
-#define GAMMA_ENTRIES	64
-
-/* Gamma table with gamma 1/2.2 */
-static const u32 isc_gamma_table[GAMMA_MAX + 1][GAMMA_ENTRIES] = {
-	/* 0 --> gamma 1/1.8 */
-	{      0x65,  0x66002F,  0x950025,  0xBB0020,  0xDB001D,  0xF8001A,
-	  0x1130018, 0x12B0017, 0x1420016, 0x1580014, 0x16D0013, 0x1810012,
-	  0x1940012, 0x1A60012, 0x1B80011, 0x1C90010, 0x1DA0010, 0x1EA000F,
-	  0x1FA000F, 0x209000F, 0x218000F, 0x227000E, 0x235000E, 0x243000E,
-	  0x251000E, 0x25F000D, 0x26C000D, 0x279000D, 0x286000D, 0x293000C,
-	  0x2A0000C, 0x2AC000C, 0x2B8000C, 0x2C4000C, 0x2D0000B, 0x2DC000B,
-	  0x2E7000B, 0x2F3000B, 0x2FE000B, 0x309000B, 0x314000B, 0x31F000A,
-	  0x32A000A, 0x334000B, 0x33F000A, 0x349000A, 0x354000A, 0x35E000A,
-	  0x368000A, 0x372000A, 0x37C000A, 0x386000A, 0x3900009, 0x399000A,
-	  0x3A30009, 0x3AD0009, 0x3B60009, 0x3BF000A, 0x3C90009, 0x3D20009,
-	  0x3DB0009, 0x3E40009, 0x3ED0009, 0x3F60009 },
-
-	/* 1 --> gamma 1/2 */
-	{      0x7F,  0x800034,  0xB50028,  0xDE0021, 0x100001E, 0x11E001B,
-	  0x1390019, 0x1520017, 0x16A0015, 0x1800014, 0x1940014, 0x1A80013,
-	  0x1BB0012, 0x1CD0011, 0x1DF0010, 0x1EF0010, 0x200000F, 0x20F000F,
-	  0x21F000E, 0x22D000F, 0x23C000E, 0x24A000E, 0x258000D, 0x265000D,
-	  0x273000C, 0x27F000D, 0x28C000C, 0x299000C, 0x2A5000C, 0x2B1000B,
-	  0x2BC000C, 0x2C8000B, 0x2D3000C, 0x2DF000B, 0x2EA000A, 0x2F5000A,
-	  0x2FF000B, 0x30A000A, 0x314000B, 0x31F000A, 0x329000A, 0x333000A,
-	  0x33D0009, 0x3470009, 0x350000A, 0x35A0009, 0x363000A, 0x36D0009,
-	  0x3760009, 0x37F0009, 0x3880009, 0x3910009, 0x39A0009, 0x3A30009,
-	  0x3AC0008, 0x3B40009, 0x3BD0008, 0x3C60008, 0x3CE0008, 0x3D60009,
-	  0x3DF0008, 0x3E70008, 0x3EF0008, 0x3F70008 },
-
-	/* 2 --> gamma 1/2.2 */
-	{      0x99,  0x9B0038,  0xD4002A,  0xFF0023, 0x122001F, 0x141001B,
-	  0x15D0019, 0x1760017, 0x18E0015, 0x1A30015, 0x1B80013, 0x1CC0012,
-	  0x1DE0011, 0x1F00010, 0x2010010, 0x2110010, 0x221000F, 0x230000F,
-	  0x23F000E, 0x24D000E, 0x25B000D, 0x269000C, 0x276000C, 0x283000C,
-	  0x28F000C, 0x29B000C, 0x2A7000C, 0x2B3000B, 0x2BF000B, 0x2CA000B,
-	  0x2D5000B, 0x2E0000A, 0x2EB000A, 0x2F5000A, 0x2FF000A, 0x30A000A,
-	  0x3140009, 0x31E0009, 0x327000A, 0x3310009, 0x33A0009, 0x3440009,
-	  0x34D0009, 0x3560009, 0x35F0009, 0x3680008, 0x3710008, 0x3790009,
-	  0x3820008, 0x38A0008, 0x3930008, 0x39B0008, 0x3A30008, 0x3AB0008,
-	  0x3B30008, 0x3BB0008, 0x3C30008, 0x3CB0007, 0x3D20008, 0x3DA0007,
-	  0x3E20007, 0x3E90007, 0x3F00008, 0x3F80007 },
-};
-
-#define ISC_IS_FORMAT_RAW(mbus_code) \
-	(((mbus_code) & 0xf000) == 0x3000)
-
-static unsigned int debug;
-module_param(debug, int, 0644);
-MODULE_PARM_DESC(debug, "debug level (0-2)");
-
-static unsigned int sensor_preferred = 1;
-module_param(sensor_preferred, uint, 0644);
-MODULE_PARM_DESC(sensor_preferred,
-		 "Sensor is preferred to output the specified format (1-on 0-off), default 1");
-
-static inline void isc_update_awb_ctrls(struct isc_device *isc)
-{
-	struct isc_ctrls *ctrls = &isc->ctrls;
-
-	regmap_write(isc->regmap, ISC_WB_O_RGR,
-		     (ISC_WB_O_ZERO_VAL - (ctrls->offset[ISC_HIS_CFG_MODE_R])) |
-		     ((ISC_WB_O_ZERO_VAL - ctrls->offset[ISC_HIS_CFG_MODE_GR]) << 16));
-	regmap_write(isc->regmap, ISC_WB_O_BGB,
-		     (ISC_WB_O_ZERO_VAL - (ctrls->offset[ISC_HIS_CFG_MODE_B])) |
-		     ((ISC_WB_O_ZERO_VAL - ctrls->offset[ISC_HIS_CFG_MODE_GB]) << 16));
-	regmap_write(isc->regmap, ISC_WB_G_RGR,
-		     ctrls->gain[ISC_HIS_CFG_MODE_R] |
-		     (ctrls->gain[ISC_HIS_CFG_MODE_GR] << 16));
-	regmap_write(isc->regmap, ISC_WB_G_BGB,
-		     ctrls->gain[ISC_HIS_CFG_MODE_B] |
-		     (ctrls->gain[ISC_HIS_CFG_MODE_GB] << 16));
-}
-
-static inline void isc_reset_awb_ctrls(struct isc_device *isc)
-{
-	int c;
-
-	for (c = ISC_HIS_CFG_MODE_GR; c <= ISC_HIS_CFG_MODE_B; c++) {
-		/* gains have a fixed point at 9 decimals */
-		isc->ctrls.gain[c] = 1 << 9;
-		/* offsets are in 2's complements, the value
-		 * will be substracted from ISC_WB_O_ZERO_VAL to obtain
-		 * 2's complement of a value between 0 and
-		 * ISC_WB_O_ZERO_VAL >> 1
-		 */
-		isc->ctrls.offset[c] = ISC_WB_O_ZERO_VAL;
-	}
-}
-
-static int isc_wait_clk_stable(struct clk_hw *hw)
-{
-	struct isc_clk *isc_clk = to_isc_clk(hw);
-	struct regmap *regmap = isc_clk->regmap;
-	unsigned long timeout = jiffies + usecs_to_jiffies(1000);
-	unsigned int status;
-
-	while (time_before(jiffies, timeout)) {
-		regmap_read(regmap, ISC_CLKSR, &status);
-		if (!(status & ISC_CLKSR_SIP))
-			return 0;
-
-		usleep_range(10, 250);
-	}
-
-	return -ETIMEDOUT;
-}
-
-static int isc_clk_prepare(struct clk_hw *hw)
-{
-	struct isc_clk *isc_clk = to_isc_clk(hw);
-
-	if (isc_clk->id == ISC_ISPCK)
-		pm_runtime_get_sync(isc_clk->dev);
-
-	return isc_wait_clk_stable(hw);
-}
-
-static void isc_clk_unprepare(struct clk_hw *hw)
-{
-	struct isc_clk *isc_clk = to_isc_clk(hw);
-
-	isc_wait_clk_stable(hw);
-
-	if (isc_clk->id == ISC_ISPCK)
-		pm_runtime_put_sync(isc_clk->dev);
-}
-
-static int isc_clk_enable(struct clk_hw *hw)
-{
-	struct isc_clk *isc_clk = to_isc_clk(hw);
-	u32 id = isc_clk->id;
-	struct regmap *regmap = isc_clk->regmap;
-	unsigned long flags;
-	unsigned int status;
-
-	dev_dbg(isc_clk->dev, "ISC CLK: %s, div = %d, parent id = %d\n",
-		__func__, isc_clk->div, isc_clk->parent_id);
-
-	spin_lock_irqsave(&isc_clk->lock, flags);
-	regmap_update_bits(regmap, ISC_CLKCFG,
-			   ISC_CLKCFG_DIV_MASK(id) | ISC_CLKCFG_SEL_MASK(id),
-			   (isc_clk->div << ISC_CLKCFG_DIV_SHIFT(id)) |
-			   (isc_clk->parent_id << ISC_CLKCFG_SEL_SHIFT(id)));
-
-	regmap_write(regmap, ISC_CLKEN, ISC_CLK(id));
-	spin_unlock_irqrestore(&isc_clk->lock, flags);
-
-	regmap_read(regmap, ISC_CLKSR, &status);
-	if (status & ISC_CLK(id))
-		return 0;
-	else
-		return -EINVAL;
-}
-
-static void isc_clk_disable(struct clk_hw *hw)
-{
-	struct isc_clk *isc_clk = to_isc_clk(hw);
-	u32 id = isc_clk->id;
-	unsigned long flags;
-
-	spin_lock_irqsave(&isc_clk->lock, flags);
-	regmap_write(isc_clk->regmap, ISC_CLKDIS, ISC_CLK(id));
-	spin_unlock_irqrestore(&isc_clk->lock, flags);
-}
-
-static int isc_clk_is_enabled(struct clk_hw *hw)
-{
-	struct isc_clk *isc_clk = to_isc_clk(hw);
-	u32 status;
-
-	if (isc_clk->id == ISC_ISPCK)
-		pm_runtime_get_sync(isc_clk->dev);
-
-	regmap_read(isc_clk->regmap, ISC_CLKSR, &status);
-
-	if (isc_clk->id == ISC_ISPCK)
-		pm_runtime_put_sync(isc_clk->dev);
-
-	return status & ISC_CLK(isc_clk->id) ? 1 : 0;
-}
-
-static unsigned long
-isc_clk_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
-{
-	struct isc_clk *isc_clk = to_isc_clk(hw);
-
-	return DIV_ROUND_CLOSEST(parent_rate, isc_clk->div + 1);
-}
-
-static int isc_clk_determine_rate(struct clk_hw *hw,
-				   struct clk_rate_request *req)
-{
-	struct isc_clk *isc_clk = to_isc_clk(hw);
-	long best_rate = -EINVAL;
-	int best_diff = -1;
-	unsigned int i, div;
-
-	for (i = 0; i < clk_hw_get_num_parents(hw); i++) {
-		struct clk_hw *parent;
-		unsigned long parent_rate;
-
-		parent = clk_hw_get_parent_by_index(hw, i);
-		if (!parent)
-			continue;
-
-		parent_rate = clk_hw_get_rate(parent);
-		if (!parent_rate)
-			continue;
-
-		for (div = 1; div < ISC_CLK_MAX_DIV + 2; div++) {
-			unsigned long rate;
-			int diff;
-
-			rate = DIV_ROUND_CLOSEST(parent_rate, div);
-			diff = abs(req->rate - rate);
-
-			if (best_diff < 0 || best_diff > diff) {
-				best_rate = rate;
-				best_diff = diff;
-				req->best_parent_rate = parent_rate;
-				req->best_parent_hw = parent;
-			}
-
-			if (!best_diff || rate < req->rate)
-				break;
-		}
-
-		if (!best_diff)
-			break;
-	}
-
-	dev_dbg(isc_clk->dev,
-		"ISC CLK: %s, best_rate = %ld, parent clk: %s @ %ld\n",
-		__func__, best_rate,
-		__clk_get_name((req->best_parent_hw)->clk),
-		req->best_parent_rate);
-
-	if (best_rate < 0)
-		return best_rate;
-
-	req->rate = best_rate;
-
-	return 0;
-}
-
-static int isc_clk_set_parent(struct clk_hw *hw, u8 index)
-{
-	struct isc_clk *isc_clk = to_isc_clk(hw);
-
-	if (index >= clk_hw_get_num_parents(hw))
-		return -EINVAL;
-
-	isc_clk->parent_id = index;
-
-	return 0;
-}
-
-static u8 isc_clk_get_parent(struct clk_hw *hw)
-{
-	struct isc_clk *isc_clk = to_isc_clk(hw);
-
-	return isc_clk->parent_id;
-}
-
-static int isc_clk_set_rate(struct clk_hw *hw,
-			     unsigned long rate,
-			     unsigned long parent_rate)
-{
-	struct isc_clk *isc_clk = to_isc_clk(hw);
-	u32 div;
-
-	if (!rate)
-		return -EINVAL;
-
-	div = DIV_ROUND_CLOSEST(parent_rate, rate);
-	if (div > (ISC_CLK_MAX_DIV + 1) || !div)
-		return -EINVAL;
-
-	isc_clk->div = div - 1;
-
-	return 0;
-}
-
-static const struct clk_ops isc_clk_ops = {
-	.prepare	= isc_clk_prepare,
-	.unprepare	= isc_clk_unprepare,
-	.enable		= isc_clk_enable,
-	.disable	= isc_clk_disable,
-	.is_enabled	= isc_clk_is_enabled,
-	.recalc_rate	= isc_clk_recalc_rate,
-	.determine_rate	= isc_clk_determine_rate,
-	.set_parent	= isc_clk_set_parent,
-	.get_parent	= isc_clk_get_parent,
-	.set_rate	= isc_clk_set_rate,
-};
-
-static int isc_clk_register(struct isc_device *isc, unsigned int id)
-{
-	struct regmap *regmap = isc->regmap;
-	struct device_node *np = isc->dev->of_node;
-	struct isc_clk *isc_clk;
-	struct clk_init_data init;
-	const char *clk_name = np->name;
-	const char *parent_names[3];
-	int num_parents;
-
-	num_parents = of_clk_get_parent_count(np);
-	if (num_parents < 1 || num_parents > 3)
-		return -EINVAL;
-
-	if (num_parents > 2 && id == ISC_ISPCK)
-		num_parents = 2;
-
-	of_clk_parent_fill(np, parent_names, num_parents);
-
-	if (id == ISC_MCK)
-		of_property_read_string(np, "clock-output-names", &clk_name);
-	else
-		clk_name = "isc-ispck";
-
-	init.parent_names	= parent_names;
-	init.num_parents	= num_parents;
-	init.name		= clk_name;
-	init.ops		= &isc_clk_ops;
-	init.flags		= CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE;
-
-	isc_clk = &isc->isc_clks[id];
-	isc_clk->hw.init	= &init;
-	isc_clk->regmap		= regmap;
-	isc_clk->id		= id;
-	isc_clk->dev		= isc->dev;
-	spin_lock_init(&isc_clk->lock);
-
-	isc_clk->clk = clk_register(isc->dev, &isc_clk->hw);
-	if (IS_ERR(isc_clk->clk)) {
-		dev_err(isc->dev, "%s: clock register fail\n", clk_name);
-		return PTR_ERR(isc_clk->clk);
-	} else if (id == ISC_MCK)
-		of_clk_add_provider(np, of_clk_src_simple_get, isc_clk->clk);
-
-	return 0;
-}
-
-static int isc_clk_init(struct isc_device *isc)
-{
-	unsigned int i;
-	int ret;
-
-	for (i = 0; i < ARRAY_SIZE(isc->isc_clks); i++)
-		isc->isc_clks[i].clk = ERR_PTR(-EINVAL);
-
-	for (i = 0; i < ARRAY_SIZE(isc->isc_clks); i++) {
-		ret = isc_clk_register(isc, i);
-		if (ret)
-			return ret;
-	}
-
-	return 0;
-}
-
-static void isc_clk_cleanup(struct isc_device *isc)
-{
-	unsigned int i;
-
-	of_clk_del_provider(isc->dev->of_node);
-
-	for (i = 0; i < ARRAY_SIZE(isc->isc_clks); i++) {
-		struct isc_clk *isc_clk = &isc->isc_clks[i];
-
-		if (!IS_ERR(isc_clk->clk))
-			clk_unregister(isc_clk->clk);
-	}
-}
-
-static int isc_queue_setup(struct vb2_queue *vq,
-			    unsigned int *nbuffers, unsigned int *nplanes,
-			    unsigned int sizes[], struct device *alloc_devs[])
-{
-	struct isc_device *isc = vb2_get_drv_priv(vq);
-	unsigned int size = isc->fmt.fmt.pix.sizeimage;
-
-	if (*nplanes)
-		return sizes[0] < size ? -EINVAL : 0;
-
-	*nplanes = 1;
-	sizes[0] = size;
-
-	return 0;
-}
-
-static int isc_buffer_prepare(struct vb2_buffer *vb)
-{
-	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
-	struct isc_device *isc = vb2_get_drv_priv(vb->vb2_queue);
-	unsigned long size = isc->fmt.fmt.pix.sizeimage;
-
-	if (vb2_plane_size(vb, 0) < size) {
-		v4l2_err(&isc->v4l2_dev, "buffer too small (%lu < %lu)\n",
-			 vb2_plane_size(vb, 0), size);
-		return -EINVAL;
-	}
-
-	vb2_set_plane_payload(vb, 0, size);
-
-	vbuf->field = isc->fmt.fmt.pix.field;
-
-	return 0;
-}
-
-static void isc_start_dma(struct isc_device *isc)
-{
-	struct regmap *regmap = isc->regmap;
-	u32 sizeimage = isc->fmt.fmt.pix.sizeimage;
-	u32 dctrl_dview;
-	dma_addr_t addr0;
-	u32 h, w;
-
-	h = isc->fmt.fmt.pix.height;
-	w = isc->fmt.fmt.pix.width;
-
-	/*
-	 * In case the sensor is not RAW, it will output a pixel (12-16 bits)
-	 * with two samples on the ISC Data bus (which is 8-12)
-	 * ISC will count each sample, so, we need to multiply these values
-	 * by two, to get the real number of samples for the required pixels.
-	 */
-	if (!ISC_IS_FORMAT_RAW(isc->config.sd_format->mbus_code)) {
-		h <<= 1;
-		w <<= 1;
-	}
-
-	/*
-	 * We limit the column/row count that the ISC will output according
-	 * to the configured resolution that we want.
-	 * This will avoid the situation where the sensor is misconfigured,
-	 * sending more data, and the ISC will just take it and DMA to memory,
-	 * causing corruption.
-	 */
-	regmap_write(regmap, ISC_PFE_CFG1,
-		     (ISC_PFE_CFG1_COLMIN(0) & ISC_PFE_CFG1_COLMIN_MASK) |
-		     (ISC_PFE_CFG1_COLMAX(w - 1) & ISC_PFE_CFG1_COLMAX_MASK));
-
-	regmap_write(regmap, ISC_PFE_CFG2,
-		     (ISC_PFE_CFG2_ROWMIN(0) & ISC_PFE_CFG2_ROWMIN_MASK) |
-		     (ISC_PFE_CFG2_ROWMAX(h - 1) & ISC_PFE_CFG2_ROWMAX_MASK));
-
-	regmap_update_bits(regmap, ISC_PFE_CFG0,
-			   ISC_PFE_CFG0_COLEN | ISC_PFE_CFG0_ROWEN,
-			   ISC_PFE_CFG0_COLEN | ISC_PFE_CFG0_ROWEN);
-
-	addr0 = vb2_dma_contig_plane_dma_addr(&isc->cur_frm->vb.vb2_buf, 0);
-	regmap_write(regmap, ISC_DAD0, addr0);
-
-	switch (isc->config.fourcc) {
-	case V4L2_PIX_FMT_YUV420:
-		regmap_write(regmap, ISC_DAD1, addr0 + (sizeimage * 2) / 3);
-		regmap_write(regmap, ISC_DAD2, addr0 + (sizeimage * 5) / 6);
-		break;
-	case V4L2_PIX_FMT_YUV422P:
-		regmap_write(regmap, ISC_DAD1, addr0 + sizeimage / 2);
-		regmap_write(regmap, ISC_DAD2, addr0 + (sizeimage * 3) / 4);
-		break;
-	default:
-		break;
-	}
-
-	dctrl_dview = isc->config.dctrl_dview;
-
-	regmap_write(regmap, ISC_DCTRL, dctrl_dview | ISC_DCTRL_IE_IS);
-	spin_lock(&isc->awb_lock);
-	regmap_write(regmap, ISC_CTRLEN, ISC_CTRL_CAPTURE);
-	spin_unlock(&isc->awb_lock);
-}
-
-static void isc_set_pipeline(struct isc_device *isc, u32 pipeline)
-{
-	struct regmap *regmap = isc->regmap;
-	struct isc_ctrls *ctrls = &isc->ctrls;
-	u32 val, bay_cfg;
-	const u32 *gamma;
-	unsigned int i;
-
-	/* WB-->CFA-->CC-->GAM-->CSC-->CBC-->SUB422-->SUB420 */
-	for (i = 0; i < ISC_PIPE_LINE_NODE_NUM; i++) {
-		val = pipeline & BIT(i) ? 1 : 0;
-		regmap_field_write(isc->pipeline[i], val);
-	}
-
-	if (!pipeline)
-		return;
-
-	bay_cfg = isc->config.sd_format->cfa_baycfg;
-
-	if (ctrls->awb == ISC_WB_NONE)
-		isc_reset_awb_ctrls(isc);
-
-	regmap_write(regmap, ISC_WB_CFG, bay_cfg);
-	isc_update_awb_ctrls(isc);
-
-	regmap_write(regmap, ISC_CFA_CFG, bay_cfg | ISC_CFA_CFG_EITPOL);
-
-	gamma = &isc_gamma_table[ctrls->gamma_index][0];
-	regmap_bulk_write(regmap, ISC_GAM_BENTRY, gamma, GAMMA_ENTRIES);
-	regmap_bulk_write(regmap, ISC_GAM_GENTRY, gamma, GAMMA_ENTRIES);
-	regmap_bulk_write(regmap, ISC_GAM_RENTRY, gamma, GAMMA_ENTRIES);
-
-	/* Convert RGB to YUV */
-	regmap_write(regmap, ISC_CSC_YR_YG, 0x42 | (0x81 << 16));
-	regmap_write(regmap, ISC_CSC_YB_OY, 0x19 | (0x10 << 16));
-	regmap_write(regmap, ISC_CSC_CBR_CBG, 0xFDA | (0xFB6 << 16));
-	regmap_write(regmap, ISC_CSC_CBB_OCB, 0x70 | (0x80 << 16));
-	regmap_write(regmap, ISC_CSC_CRR_CRG, 0x70 | (0xFA2 << 16));
-	regmap_write(regmap, ISC_CSC_CRB_OCR, 0xFEE | (0x80 << 16));
-
-	regmap_write(regmap, ISC_CBC_BRIGHT, ctrls->brightness);
-	regmap_write(regmap, ISC_CBC_CONTRAST, ctrls->contrast);
-}
-
-static int isc_update_profile(struct isc_device *isc)
-{
-	struct regmap *regmap = isc->regmap;
-	u32 sr;
-	int counter = 100;
-
-	regmap_write(regmap, ISC_CTRLEN, ISC_CTRL_UPPRO);
-
-	regmap_read(regmap, ISC_CTRLSR, &sr);
-	while ((sr & ISC_CTRL_UPPRO) && counter--) {
-		usleep_range(1000, 2000);
-		regmap_read(regmap, ISC_CTRLSR, &sr);
-	}
-
-	if (counter < 0) {
-		v4l2_warn(&isc->v4l2_dev, "Time out to update profile\n");
-		return -ETIMEDOUT;
-	}
-
-	return 0;
-}
-
-static void isc_set_histogram(struct isc_device *isc, bool enable)
-{
-	struct regmap *regmap = isc->regmap;
-	struct isc_ctrls *ctrls = &isc->ctrls;
-
-	if (enable) {
-		regmap_write(regmap, ISC_HIS_CFG,
-			     ISC_HIS_CFG_MODE_GR |
-			     (isc->config.sd_format->cfa_baycfg
-					<< ISC_HIS_CFG_BAYSEL_SHIFT) |
-					ISC_HIS_CFG_RAR);
-		regmap_write(regmap, ISC_HIS_CTRL, ISC_HIS_CTRL_EN);
-		regmap_write(regmap, ISC_INTEN, ISC_INT_HISDONE);
-		ctrls->hist_id = ISC_HIS_CFG_MODE_GR;
-		isc_update_profile(isc);
-		regmap_write(regmap, ISC_CTRLEN, ISC_CTRL_HISREQ);
-
-		ctrls->hist_stat = HIST_ENABLED;
-	} else {
-		regmap_write(regmap, ISC_INTDIS, ISC_INT_HISDONE);
-		regmap_write(regmap, ISC_HIS_CTRL, ISC_HIS_CTRL_DIS);
-
-		ctrls->hist_stat = HIST_DISABLED;
-	}
-}
-
-static int isc_configure(struct isc_device *isc)
-{
-	struct regmap *regmap = isc->regmap;
-	u32 pfe_cfg0, rlp_mode, dcfg, mask, pipeline;
-	struct isc_subdev_entity *subdev = isc->current_subdev;
-
-	pfe_cfg0 = isc->config.sd_format->pfe_cfg0_bps;
-	rlp_mode = isc->config.rlp_cfg_mode;
-	pipeline = isc->config.bits_pipeline;
-
-	dcfg = isc->config.dcfg_imode |
-		       ISC_DCFG_YMBSIZE_BEATS8 | ISC_DCFG_CMBSIZE_BEATS8;
-
-	pfe_cfg0  |= subdev->pfe_cfg0 | ISC_PFE_CFG0_MODE_PROGRESSIVE;
-	mask = ISC_PFE_CFG0_BPS_MASK | ISC_PFE_CFG0_HPOL_LOW |
-	       ISC_PFE_CFG0_VPOL_LOW | ISC_PFE_CFG0_PPOL_LOW |
-	       ISC_PFE_CFG0_MODE_MASK | ISC_PFE_CFG0_CCIR_CRC |
-		   ISC_PFE_CFG0_CCIR656;
-
-	regmap_update_bits(regmap, ISC_PFE_CFG0, mask, pfe_cfg0);
-
-	regmap_update_bits(regmap, ISC_RLP_CFG, ISC_RLP_CFG_MODE_MASK,
-			   rlp_mode);
-
-	regmap_write(regmap, ISC_DCFG, dcfg);
-
-	/* Set the pipeline */
-	isc_set_pipeline(isc, pipeline);
-
-	/*
-	 * The current implemented histogram is available for RAW R, B, GB, GR
-	 * channels. We need to check if sensor is outputting RAW BAYER
-	 */
-	if (isc->ctrls.awb &&
-	    ISC_IS_FORMAT_RAW(isc->config.sd_format->mbus_code))
-		isc_set_histogram(isc, true);
-	else
-		isc_set_histogram(isc, false);
-
-	/* Update profile */
-	return isc_update_profile(isc);
-}
-
-static int isc_start_streaming(struct vb2_queue *vq, unsigned int count)
-{
-	struct isc_device *isc = vb2_get_drv_priv(vq);
-	struct regmap *regmap = isc->regmap;
-	struct isc_buffer *buf;
-	unsigned long flags;
-	int ret;
-
-	/* Enable stream on the sub device */
-	ret = v4l2_subdev_call(isc->current_subdev->sd, video, s_stream, 1);
-	if (ret && ret != -ENOIOCTLCMD) {
-		v4l2_err(&isc->v4l2_dev, "stream on failed in subdev %d\n",
-			 ret);
-		goto err_start_stream;
-	}
-
-	pm_runtime_get_sync(isc->dev);
-
-	ret = isc_configure(isc);
-	if (unlikely(ret))
-		goto err_configure;
-
-	/* Enable DMA interrupt */
-	regmap_write(regmap, ISC_INTEN, ISC_INT_DDONE);
-
-	spin_lock_irqsave(&isc->dma_queue_lock, flags);
-
-	isc->sequence = 0;
-	isc->stop = false;
-	reinit_completion(&isc->comp);
-
-	isc->cur_frm = list_first_entry(&isc->dma_queue,
-					struct isc_buffer, list);
-	list_del(&isc->cur_frm->list);
-
-	isc_start_dma(isc);
-
-	spin_unlock_irqrestore(&isc->dma_queue_lock, flags);
-
-	/* if we streaming from RAW, we can do one-shot white balance adj */
-	if (ISC_IS_FORMAT_RAW(isc->config.sd_format->mbus_code))
-		v4l2_ctrl_activate(isc->do_wb_ctrl, true);
-
-	return 0;
-
-err_configure:
-	pm_runtime_put_sync(isc->dev);
-
-	v4l2_subdev_call(isc->current_subdev->sd, video, s_stream, 0);
-
-err_start_stream:
-	spin_lock_irqsave(&isc->dma_queue_lock, flags);
-	list_for_each_entry(buf, &isc->dma_queue, list)
-		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
-	INIT_LIST_HEAD(&isc->dma_queue);
-	spin_unlock_irqrestore(&isc->dma_queue_lock, flags);
-
-	return ret;
-}
-
-static void isc_stop_streaming(struct vb2_queue *vq)
-{
-	struct isc_device *isc = vb2_get_drv_priv(vq);
-	unsigned long flags;
-	struct isc_buffer *buf;
-	int ret;
-
-	v4l2_ctrl_activate(isc->do_wb_ctrl, false);
-
-	isc->stop = true;
-
-	/* Wait until the end of the current frame */
-	if (isc->cur_frm && !wait_for_completion_timeout(&isc->comp, 5 * HZ))
-		v4l2_err(&isc->v4l2_dev,
-			 "Timeout waiting for end of the capture\n");
-
-	/* Disable DMA interrupt */
-	regmap_write(isc->regmap, ISC_INTDIS, ISC_INT_DDONE);
-
-	pm_runtime_put_sync(isc->dev);
-
-	/* Disable stream on the sub device */
-	ret = v4l2_subdev_call(isc->current_subdev->sd, video, s_stream, 0);
-	if (ret && ret != -ENOIOCTLCMD)
-		v4l2_err(&isc->v4l2_dev, "stream off failed in subdev\n");
-
-	/* Release all active buffers */
-	spin_lock_irqsave(&isc->dma_queue_lock, flags);
-	if (unlikely(isc->cur_frm)) {
-		vb2_buffer_done(&isc->cur_frm->vb.vb2_buf,
-				VB2_BUF_STATE_ERROR);
-		isc->cur_frm = NULL;
-	}
-	list_for_each_entry(buf, &isc->dma_queue, list)
-		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
-	INIT_LIST_HEAD(&isc->dma_queue);
-	spin_unlock_irqrestore(&isc->dma_queue_lock, flags);
-}
-
-static void isc_buffer_queue(struct vb2_buffer *vb)
-{
-	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
-	struct isc_buffer *buf = container_of(vbuf, struct isc_buffer, vb);
-	struct isc_device *isc = vb2_get_drv_priv(vb->vb2_queue);
-	unsigned long flags;
-
-	spin_lock_irqsave(&isc->dma_queue_lock, flags);
-	if (!isc->cur_frm && list_empty(&isc->dma_queue) &&
-		vb2_is_streaming(vb->vb2_queue)) {
-		isc->cur_frm = buf;
-		isc_start_dma(isc);
-	} else
-		list_add_tail(&buf->list, &isc->dma_queue);
-	spin_unlock_irqrestore(&isc->dma_queue_lock, flags);
-}
-
-static struct isc_format *find_format_by_fourcc(struct isc_device *isc,
-						 unsigned int fourcc)
-{
-	unsigned int num_formats = isc->num_user_formats;
-	struct isc_format *fmt;
-	unsigned int i;
-
-	for (i = 0; i < num_formats; i++) {
-		fmt = isc->user_formats[i];
-		if (fmt->fourcc == fourcc)
-			return fmt;
-	}
-
-	return NULL;
-}
-
-static const struct vb2_ops isc_vb2_ops = {
-	.queue_setup		= isc_queue_setup,
-	.wait_prepare		= vb2_ops_wait_prepare,
-	.wait_finish		= vb2_ops_wait_finish,
-	.buf_prepare		= isc_buffer_prepare,
-	.start_streaming	= isc_start_streaming,
-	.stop_streaming		= isc_stop_streaming,
-	.buf_queue		= isc_buffer_queue,
-};
-
-static int isc_querycap(struct file *file, void *priv,
-			 struct v4l2_capability *cap)
-{
-	struct isc_device *isc = video_drvdata(file);
-
-	strscpy(cap->driver, ATMEL_ISC_NAME, sizeof(cap->driver));
-	strscpy(cap->card, "Atmel Image Sensor Controller", sizeof(cap->card));
-	snprintf(cap->bus_info, sizeof(cap->bus_info),
-		 "platform:%s", isc->v4l2_dev.name);
-
-	return 0;
-}
-
-static int isc_enum_fmt_vid_cap(struct file *file, void *priv,
-				 struct v4l2_fmtdesc *f)
-{
-	u32 index = f->index;
-	u32 i, supported_index;
-
-	if (index < ARRAY_SIZE(controller_formats)) {
-		f->pixelformat = controller_formats[index].fourcc;
-		return 0;
-	}
-
-	index -= ARRAY_SIZE(controller_formats);
-
-	i = 0;
-	supported_index = 0;
-
-	for (i = 0; i < ARRAY_SIZE(formats_list); i++) {
-		if (!ISC_IS_FORMAT_RAW(formats_list[i].mbus_code) ||
-		    !formats_list[i].sd_support)
-			continue;
-		if (supported_index == index) {
-			f->pixelformat = formats_list[i].fourcc;
-			return 0;
-		}
-		supported_index++;
-	}
-
-	return -EINVAL;
-}
-
-static int isc_g_fmt_vid_cap(struct file *file, void *priv,
-			      struct v4l2_format *fmt)
-{
-	struct isc_device *isc = video_drvdata(file);
-
-	*fmt = isc->fmt;
-
-	return 0;
-}
-
-/*
- * Checks the current configured format, if ISC can output it,
- * considering which type of format the ISC receives from the sensor
- */
-static int isc_try_validate_formats(struct isc_device *isc)
-{
-	int ret;
-	bool bayer = false, yuv = false, rgb = false, grey = false;
-
-	/* all formats supported by the RLP module are OK */
-	switch (isc->try_config.fourcc) {
-	case V4L2_PIX_FMT_SBGGR8:
-	case V4L2_PIX_FMT_SGBRG8:
-	case V4L2_PIX_FMT_SGRBG8:
-	case V4L2_PIX_FMT_SRGGB8:
-	case V4L2_PIX_FMT_SBGGR10:
-	case V4L2_PIX_FMT_SGBRG10:
-	case V4L2_PIX_FMT_SGRBG10:
-	case V4L2_PIX_FMT_SRGGB10:
-	case V4L2_PIX_FMT_SBGGR12:
-	case V4L2_PIX_FMT_SGBRG12:
-	case V4L2_PIX_FMT_SGRBG12:
-	case V4L2_PIX_FMT_SRGGB12:
-		ret = 0;
-		bayer = true;
-		break;
-
-	case V4L2_PIX_FMT_YUV420:
-	case V4L2_PIX_FMT_YUV422P:
-	case V4L2_PIX_FMT_YUYV:
-		ret = 0;
-		yuv = true;
-		break;
-
-	case V4L2_PIX_FMT_RGB565:
-	case V4L2_PIX_FMT_ABGR32:
-	case V4L2_PIX_FMT_XBGR32:
-	case V4L2_PIX_FMT_ARGB444:
-	case V4L2_PIX_FMT_ARGB555:
-		ret = 0;
-		rgb = true;
-		break;
-	case V4L2_PIX_FMT_GREY:
-		ret = 0;
-		grey = true;
-		break;
-	default:
-	/* any other different formats are not supported */
-		ret = -EINVAL;
-	}
-
-	/* we cannot output RAW/Grey if we do not receive RAW */
-	if ((bayer || grey) &&
-	    !ISC_IS_FORMAT_RAW(isc->try_config.sd_format->mbus_code))
-		return -EINVAL;
-
-	v4l2_dbg(1, debug, &isc->v4l2_dev,
-		 "Format validation, requested rgb=%u, yuv=%u, grey=%u, bayer=%u\n",
-		 rgb, yuv, grey, bayer);
-
-	return ret;
-}
-
-/*
- * Configures the RLP and DMA modules, depending on the output format
- * configured for the ISC.
- * If direct_dump == true, just dump raw data 8 bits.
- */
-static int isc_try_configure_rlp_dma(struct isc_device *isc, bool direct_dump)
-{
-	if (direct_dump) {
-		isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_DAT8;
-		isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED8;
-		isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
-		isc->try_config.bpp = 16;
-		return 0;
-	}
-
-	switch (isc->try_config.fourcc) {
-	case V4L2_PIX_FMT_SBGGR8:
-	case V4L2_PIX_FMT_SGBRG8:
-	case V4L2_PIX_FMT_SGRBG8:
-	case V4L2_PIX_FMT_SRGGB8:
-		isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_DAT8;
-		isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED8;
-		isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
-		isc->try_config.bpp = 8;
-		break;
-	case V4L2_PIX_FMT_SBGGR10:
-	case V4L2_PIX_FMT_SGBRG10:
-	case V4L2_PIX_FMT_SGRBG10:
-	case V4L2_PIX_FMT_SRGGB10:
-		isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_DAT10;
-		isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED16;
-		isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
-		isc->try_config.bpp = 16;
-		break;
-	case V4L2_PIX_FMT_SBGGR12:
-	case V4L2_PIX_FMT_SGBRG12:
-	case V4L2_PIX_FMT_SGRBG12:
-	case V4L2_PIX_FMT_SRGGB12:
-		isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_DAT12;
-		isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED16;
-		isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
-		isc->try_config.bpp = 16;
-		break;
-	case V4L2_PIX_FMT_RGB565:
-		isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_RGB565;
-		isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED16;
-		isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
-		isc->try_config.bpp = 16;
-		break;
-	case V4L2_PIX_FMT_ARGB444:
-		isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_ARGB444;
-		isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED16;
-		isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
-		isc->try_config.bpp = 16;
-		break;
-	case V4L2_PIX_FMT_ARGB555:
-		isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_ARGB555;
-		isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED16;
-		isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
-		isc->try_config.bpp = 16;
-		break;
-	case V4L2_PIX_FMT_ABGR32:
-	case V4L2_PIX_FMT_XBGR32:
-		isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_ARGB32;
-		isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED32;
-		isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
-		isc->try_config.bpp = 32;
-		break;
-	case V4L2_PIX_FMT_YUV420:
-		isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_YYCC;
-		isc->try_config.dcfg_imode = ISC_DCFG_IMODE_YC420P;
-		isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PLANAR;
-		isc->try_config.bpp = 12;
-		break;
-	case V4L2_PIX_FMT_YUV422P:
-		isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_YYCC;
-		isc->try_config.dcfg_imode = ISC_DCFG_IMODE_YC422P;
-		isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PLANAR;
-		isc->try_config.bpp = 16;
-		break;
-	case V4L2_PIX_FMT_YUYV:
-		isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_YYCC;
-		isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED32;
-		isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
-		isc->try_config.bpp = 16;
-		break;
-	case V4L2_PIX_FMT_GREY:
-		isc->try_config.rlp_cfg_mode = ISC_RLP_CFG_MODE_DATY8;
-		isc->try_config.dcfg_imode = ISC_DCFG_IMODE_PACKED8;
-		isc->try_config.dctrl_dview = ISC_DCTRL_DVIEW_PACKED;
-		isc->try_config.bpp = 8;
-		break;
-	default:
-		return -EINVAL;
-	}
-	return 0;
-}
-
-/*
- * Configuring pipeline modules, depending on which format the ISC outputs
- * and considering which format it has as input from the sensor.
- */
-static int isc_try_configure_pipeline(struct isc_device *isc)
-{
-	switch (isc->try_config.fourcc) {
-	case V4L2_PIX_FMT_RGB565:
-	case V4L2_PIX_FMT_ARGB555:
-	case V4L2_PIX_FMT_ARGB444:
-	case V4L2_PIX_FMT_ABGR32:
-	case V4L2_PIX_FMT_XBGR32:
-		/* if sensor format is RAW, we convert inside ISC */
-		if (ISC_IS_FORMAT_RAW(isc->try_config.sd_format->mbus_code)) {
-			isc->try_config.bits_pipeline = CFA_ENABLE |
-				WB_ENABLE | GAM_ENABLES;
-		} else {
-			isc->try_config.bits_pipeline = 0x0;
-		}
-		break;
-	case V4L2_PIX_FMT_YUV420:
-		/* if sensor format is RAW, we convert inside ISC */
-		if (ISC_IS_FORMAT_RAW(isc->try_config.sd_format->mbus_code)) {
-			isc->try_config.bits_pipeline = CFA_ENABLE |
-				CSC_ENABLE | WB_ENABLE | GAM_ENABLES |
-				SUB420_ENABLE | SUB422_ENABLE | CBC_ENABLE;
-		} else {
-			isc->try_config.bits_pipeline = 0x0;
-		}
-		break;
-	case V4L2_PIX_FMT_YUV422P:
-		/* if sensor format is RAW, we convert inside ISC */
-		if (ISC_IS_FORMAT_RAW(isc->try_config.sd_format->mbus_code)) {
-			isc->try_config.bits_pipeline = CFA_ENABLE |
-				CSC_ENABLE | WB_ENABLE | GAM_ENABLES |
-				SUB422_ENABLE | CBC_ENABLE;
-		} else {
-			isc->try_config.bits_pipeline = 0x0;
-		}
-		break;
-	case V4L2_PIX_FMT_YUYV:
-		/* if sensor format is RAW, we convert inside ISC */
-		if (ISC_IS_FORMAT_RAW(isc->try_config.sd_format->mbus_code)) {
-			isc->try_config.bits_pipeline = CFA_ENABLE |
-				CSC_ENABLE | WB_ENABLE | GAM_ENABLES |
-				SUB422_ENABLE | CBC_ENABLE;
-		} else {
-			isc->try_config.bits_pipeline = 0x0;
-		}
-		break;
-	case V4L2_PIX_FMT_GREY:
-		if (ISC_IS_FORMAT_RAW(isc->try_config.sd_format->mbus_code)) {
-		/* if sensor format is RAW, we convert inside ISC */
-			isc->try_config.bits_pipeline = CFA_ENABLE |
-				CSC_ENABLE | WB_ENABLE | GAM_ENABLES |
-				CBC_ENABLE;
-		} else {
-			isc->try_config.bits_pipeline = 0x0;
-		}
-		break;
-	default:
-		isc->try_config.bits_pipeline = 0x0;
-	}
-	return 0;
-}
-
-static int isc_try_fmt(struct isc_device *isc, struct v4l2_format *f,
-			u32 *code)
-{
-	int i;
-	struct isc_format *sd_fmt = NULL, *direct_fmt = NULL;
-	struct v4l2_pix_format *pixfmt = &f->fmt.pix;
-	struct v4l2_subdev_pad_config pad_cfg;
-	struct v4l2_subdev_format format = {
-		.which = V4L2_SUBDEV_FORMAT_TRY,
-	};
-	u32 mbus_code;
-	int ret;
-	bool rlp_dma_direct_dump = false;
-
-	if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
-		return -EINVAL;
-
-	/* Step 1: find a RAW format that is supported */
-	for (i = 0; i < isc->num_user_formats; i++) {
-		if (ISC_IS_FORMAT_RAW(isc->user_formats[i]->mbus_code)) {
-			sd_fmt = isc->user_formats[i];
-			break;
-		}
-	}
-	/* Step 2: We can continue with this RAW format, or we can look
-	 * for better: maybe sensor supports directly what we need.
-	 */
-	direct_fmt = find_format_by_fourcc(isc, pixfmt->pixelformat);
-
-	/* Step 3: We have both. We decide given the module parameter which
-	 * one to use.
-	 */
-	if (direct_fmt && sd_fmt && sensor_preferred)
-		sd_fmt = direct_fmt;
-
-	/* Step 4: we do not have RAW but we have a direct format. Use it. */
-	if (direct_fmt && !sd_fmt)
-		sd_fmt = direct_fmt;
-
-	/* Step 5: if we are using a direct format, we need to package
-	 * everything as 8 bit data and just dump it
-	 */
-	if (sd_fmt == direct_fmt)
-		rlp_dma_direct_dump = true;
-
-	/* Step 6: We have no format. This can happen if the userspace
-	 * requests some weird/invalid format.
-	 * In this case, default to whatever we have
-	 */
-	if (!sd_fmt && !direct_fmt) {
-		sd_fmt = isc->user_formats[isc->num_user_formats - 1];
-		v4l2_dbg(1, debug, &isc->v4l2_dev,
-			 "Sensor not supporting %.4s, using %.4s\n",
-			 (char *)&pixfmt->pixelformat, (char *)&sd_fmt->fourcc);
-	}
-
-	if (!sd_fmt) {
-		ret = -EINVAL;
-		goto isc_try_fmt_err;
-	}
-
-	/* Step 7: Print out what we decided for debugging */
-	v4l2_dbg(1, debug, &isc->v4l2_dev,
-		 "Preferring to have sensor using format %.4s\n",
-		 (char *)&sd_fmt->fourcc);
-
-	/* Step 8: at this moment we decided which format the subdev will use */
-	isc->try_config.sd_format = sd_fmt;
-
-	/* Limit to Atmel ISC hardware capabilities */
-	if (pixfmt->width > ISC_MAX_SUPPORT_WIDTH)
-		pixfmt->width = ISC_MAX_SUPPORT_WIDTH;
-	if (pixfmt->height > ISC_MAX_SUPPORT_HEIGHT)
-		pixfmt->height = ISC_MAX_SUPPORT_HEIGHT;
-
-	/*
-	 * The mbus format is the one the subdev outputs.
-	 * The pixels will be transferred in this format Sensor -> ISC
-	 */
-	mbus_code = sd_fmt->mbus_code;
-
-	/*
-	 * Validate formats. If the required format is not OK, default to raw.
-	 */
-
-	isc->try_config.fourcc = pixfmt->pixelformat;
-
-	if (isc_try_validate_formats(isc)) {
-		pixfmt->pixelformat = isc->try_config.fourcc = sd_fmt->fourcc;
-		/* Re-try to validate the new format */
-		ret = isc_try_validate_formats(isc);
-		if (ret)
-			goto isc_try_fmt_err;
-	}
-
-	ret = isc_try_configure_rlp_dma(isc, rlp_dma_direct_dump);
-	if (ret)
-		goto isc_try_fmt_err;
-
-	ret = isc_try_configure_pipeline(isc);
-	if (ret)
-		goto isc_try_fmt_err;
-
-	v4l2_fill_mbus_format(&format.format, pixfmt, mbus_code);
-	ret = v4l2_subdev_call(isc->current_subdev->sd, pad, set_fmt,
-			       &pad_cfg, &format);
-	if (ret < 0)
-		goto isc_try_fmt_subdev_err;
-
-	v4l2_fill_pix_format(pixfmt, &format.format);
-
-	pixfmt->field = V4L2_FIELD_NONE;
-	pixfmt->bytesperline = (pixfmt->width * isc->try_config.bpp) >> 3;
-	pixfmt->sizeimage = pixfmt->bytesperline * pixfmt->height;
-
-	if (code)
-		*code = mbus_code;
-
-	return 0;
-
-isc_try_fmt_err:
-	v4l2_err(&isc->v4l2_dev, "Could not find any possible format for a working pipeline\n");
-isc_try_fmt_subdev_err:
-	memset(&isc->try_config, 0, sizeof(isc->try_config));
-
-	return ret;
-}
-
-static int isc_set_fmt(struct isc_device *isc, struct v4l2_format *f)
-{
-	struct v4l2_subdev_format format = {
-		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
-	};
-	u32 mbus_code = 0;
-	int ret;
-
-	ret = isc_try_fmt(isc, f, &mbus_code);
-	if (ret)
-		return ret;
-
-	v4l2_fill_mbus_format(&format.format, &f->fmt.pix, mbus_code);
-	ret = v4l2_subdev_call(isc->current_subdev->sd, pad,
-			       set_fmt, NULL, &format);
-	if (ret < 0)
-		return ret;
-
-	isc->fmt = *f;
-
-	if (isc->try_config.sd_format && isc->config.sd_format &&
-	    isc->try_config.sd_format != isc->config.sd_format) {
-		isc->ctrls.hist_stat = HIST_INIT;
-		isc_reset_awb_ctrls(isc);
-	}
-	/* make the try configuration active */
-	isc->config = isc->try_config;
-
-	v4l2_dbg(1, debug, &isc->v4l2_dev, "New ISC configuration in place\n");
-
-	return 0;
-}
-
-static int isc_s_fmt_vid_cap(struct file *file, void *priv,
-			      struct v4l2_format *f)
-{
-	struct isc_device *isc = video_drvdata(file);
-
-	if (vb2_is_streaming(&isc->vb2_vidq))
-		return -EBUSY;
-
-	return isc_set_fmt(isc, f);
-}
-
-static int isc_try_fmt_vid_cap(struct file *file, void *priv,
-				struct v4l2_format *f)
-{
-	struct isc_device *isc = video_drvdata(file);
-
-	return isc_try_fmt(isc, f, NULL);
-}
-
-static int isc_enum_input(struct file *file, void *priv,
-			   struct v4l2_input *inp)
-{
-	if (inp->index != 0)
-		return -EINVAL;
-
-	inp->type = V4L2_INPUT_TYPE_CAMERA;
-	inp->std = 0;
-	strscpy(inp->name, "Camera", sizeof(inp->name));
-
-	return 0;
-}
-
-static int isc_g_input(struct file *file, void *priv, unsigned int *i)
-{
-	*i = 0;
-
-	return 0;
-}
-
-static int isc_s_input(struct file *file, void *priv, unsigned int i)
-{
-	if (i > 0)
-		return -EINVAL;
-
-	return 0;
-}
-
-static int isc_g_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
-{
-	struct isc_device *isc = video_drvdata(file);
-
-	return v4l2_g_parm_cap(video_devdata(file), isc->current_subdev->sd, a);
-}
-
-static int isc_s_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
-{
-	struct isc_device *isc = video_drvdata(file);
-
-	return v4l2_s_parm_cap(video_devdata(file), isc->current_subdev->sd, a);
-}
-
-static int isc_enum_framesizes(struct file *file, void *fh,
-			       struct v4l2_frmsizeenum *fsize)
-{
-	struct isc_device *isc = video_drvdata(file);
-	struct v4l2_subdev_frame_size_enum fse = {
-		.index = fsize->index,
-		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
-	};
-	int ret = -EINVAL;
-	int i;
-
-	for (i = 0; i < isc->num_user_formats; i++)
-		if (isc->user_formats[i]->fourcc == fsize->pixel_format)
-			ret = 0;
-
-	for (i = 0; i < ARRAY_SIZE(controller_formats); i++)
-		if (controller_formats[i].fourcc == fsize->pixel_format)
-			ret = 0;
-
-	if (ret)
-		return ret;
-
-	ret = v4l2_subdev_call(isc->current_subdev->sd, pad, enum_frame_size,
-			       NULL, &fse);
-	if (ret)
-		return ret;
-
-	fse.code = isc->config.sd_format->mbus_code;
-
-	fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
-	fsize->discrete.width = fse.max_width;
-	fsize->discrete.height = fse.max_height;
-
-	return 0;
-}
-
-static int isc_enum_frameintervals(struct file *file, void *fh,
-				    struct v4l2_frmivalenum *fival)
-{
-	struct isc_device *isc = video_drvdata(file);
-	struct v4l2_subdev_frame_interval_enum fie = {
-		.index = fival->index,
-		.width = fival->width,
-		.height = fival->height,
-		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
-	};
-	int ret = -EINVAL;
-	int i;
-
-	for (i = 0; i < isc->num_user_formats; i++)
-		if (isc->user_formats[i]->fourcc == fival->pixel_format)
-			ret = 0;
-
-	for (i = 0; i < ARRAY_SIZE(controller_formats); i++)
-		if (controller_formats[i].fourcc == fival->pixel_format)
-			ret = 0;
-
-	if (ret)
-		return ret;
-
-	ret = v4l2_subdev_call(isc->current_subdev->sd, pad,
-			       enum_frame_interval, NULL, &fie);
-	if (ret)
-		return ret;
-
-	fie.code = isc->config.sd_format->mbus_code;
-	fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
-	fival->discrete = fie.interval;
-
-	return 0;
-}
-
-static const struct v4l2_ioctl_ops isc_ioctl_ops = {
-	.vidioc_querycap		= isc_querycap,
-	.vidioc_enum_fmt_vid_cap	= isc_enum_fmt_vid_cap,
-	.vidioc_g_fmt_vid_cap		= isc_g_fmt_vid_cap,
-	.vidioc_s_fmt_vid_cap		= isc_s_fmt_vid_cap,
-	.vidioc_try_fmt_vid_cap		= isc_try_fmt_vid_cap,
-
-	.vidioc_enum_input		= isc_enum_input,
-	.vidioc_g_input			= isc_g_input,
-	.vidioc_s_input			= isc_s_input,
-
-	.vidioc_reqbufs			= vb2_ioctl_reqbufs,
-	.vidioc_querybuf		= vb2_ioctl_querybuf,
-	.vidioc_qbuf			= vb2_ioctl_qbuf,
-	.vidioc_expbuf			= vb2_ioctl_expbuf,
-	.vidioc_dqbuf			= vb2_ioctl_dqbuf,
-	.vidioc_create_bufs		= vb2_ioctl_create_bufs,
-	.vidioc_prepare_buf		= vb2_ioctl_prepare_buf,
-	.vidioc_streamon		= vb2_ioctl_streamon,
-	.vidioc_streamoff		= vb2_ioctl_streamoff,
-
-	.vidioc_g_parm			= isc_g_parm,
-	.vidioc_s_parm			= isc_s_parm,
-	.vidioc_enum_framesizes		= isc_enum_framesizes,
-	.vidioc_enum_frameintervals	= isc_enum_frameintervals,
-
-	.vidioc_log_status		= v4l2_ctrl_log_status,
-	.vidioc_subscribe_event		= v4l2_ctrl_subscribe_event,
-	.vidioc_unsubscribe_event	= v4l2_event_unsubscribe,
-};
-
-static int isc_open(struct file *file)
-{
-	struct isc_device *isc = video_drvdata(file);
-	struct v4l2_subdev *sd = isc->current_subdev->sd;
-	int ret;
-
-	if (mutex_lock_interruptible(&isc->lock))
-		return -ERESTARTSYS;
-
-	ret = v4l2_fh_open(file);
-	if (ret < 0)
-		goto unlock;
-
-	if (!v4l2_fh_is_singular_file(file))
-		goto unlock;
-
-	ret = v4l2_subdev_call(sd, core, s_power, 1);
-	if (ret < 0 && ret != -ENOIOCTLCMD) {
-		v4l2_fh_release(file);
-		goto unlock;
-	}
-
-	ret = isc_set_fmt(isc, &isc->fmt);
-	if (ret) {
-		v4l2_subdev_call(sd, core, s_power, 0);
-		v4l2_fh_release(file);
-	}
-
-unlock:
-	mutex_unlock(&isc->lock);
-	return ret;
-}
-
-static int isc_release(struct file *file)
-{
-	struct isc_device *isc = video_drvdata(file);
-	struct v4l2_subdev *sd = isc->current_subdev->sd;
-	bool fh_singular;
-	int ret;
-
-	mutex_lock(&isc->lock);
-
-	fh_singular = v4l2_fh_is_singular_file(file);
-
-	ret = _vb2_fop_release(file, NULL);
-
-	if (fh_singular)
-		v4l2_subdev_call(sd, core, s_power, 0);
-
-	mutex_unlock(&isc->lock);
-
-	return ret;
-}
-
-static const struct v4l2_file_operations isc_fops = {
-	.owner		= THIS_MODULE,
-	.open		= isc_open,
-	.release	= isc_release,
-	.unlocked_ioctl	= video_ioctl2,
-	.read		= vb2_fop_read,
-	.mmap		= vb2_fop_mmap,
-	.poll		= vb2_fop_poll,
-};
-
-static irqreturn_t isc_interrupt(int irq, void *dev_id)
-{
-	struct isc_device *isc = (struct isc_device *)dev_id;
-	struct regmap *regmap = isc->regmap;
-	u32 isc_intsr, isc_intmask, pending;
-	irqreturn_t ret = IRQ_NONE;
-
-	regmap_read(regmap, ISC_INTSR, &isc_intsr);
-	regmap_read(regmap, ISC_INTMASK, &isc_intmask);
-
-	pending = isc_intsr & isc_intmask;
-
-	if (likely(pending & ISC_INT_DDONE)) {
-		spin_lock(&isc->dma_queue_lock);
-		if (isc->cur_frm) {
-			struct vb2_v4l2_buffer *vbuf = &isc->cur_frm->vb;
-			struct vb2_buffer *vb = &vbuf->vb2_buf;
-
-			vb->timestamp = ktime_get_ns();
-			vbuf->sequence = isc->sequence++;
-			vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
-			isc->cur_frm = NULL;
-		}
-
-		if (!list_empty(&isc->dma_queue) && !isc->stop) {
-			isc->cur_frm = list_first_entry(&isc->dma_queue,
-						     struct isc_buffer, list);
-			list_del(&isc->cur_frm->list);
-
-			isc_start_dma(isc);
-		}
-
-		if (isc->stop)
-			complete(&isc->comp);
-
-		ret = IRQ_HANDLED;
-		spin_unlock(&isc->dma_queue_lock);
-	}
-
-	if (pending & ISC_INT_HISDONE) {
-		schedule_work(&isc->awb_work);
-		ret = IRQ_HANDLED;
-	}
-
-	return ret;
-}
-
-static void isc_hist_count(struct isc_device *isc, u32 *min, u32 *max)
-{
-	struct regmap *regmap = isc->regmap;
-	struct isc_ctrls *ctrls = &isc->ctrls;
-	u32 *hist_count = &ctrls->hist_count[ctrls->hist_id];
-	u32 *hist_entry = &ctrls->hist_entry[0];
-	u32 i;
-
-	*min = 0;
-	*max = HIST_ENTRIES;
-
-	regmap_bulk_read(regmap, ISC_HIS_ENTRY, hist_entry, HIST_ENTRIES);
-
-	*hist_count = 0;
-	/*
-	 * we deliberately ignore the end of the histogram,
-	 * the most white pixels
-	 */
-	for (i = 1; i < HIST_ENTRIES; i++) {
-		if (*hist_entry && !*min)
-			*min = i;
-		if (*hist_entry)
-			*max = i;
-		*hist_count += i * (*hist_entry++);
-	}
-
-	if (!*min)
-		*min = 1;
-}
-
-static void isc_wb_update(struct isc_ctrls *ctrls)
-{
-	u32 *hist_count = &ctrls->hist_count[0];
-	u32 c, offset[4];
-	u64 avg = 0;
-	/* We compute two gains, stretch gain and grey world gain */
-	u32 s_gain[4], gw_gain[4];
-
-	/*
-	 * According to Grey World, we need to set gains for R/B to normalize
-	 * them towards the green channel.
-	 * Thus we want to keep Green as fixed and adjust only Red/Blue
-	 * Compute the average of the both green channels first
-	 */
-	avg = (u64)hist_count[ISC_HIS_CFG_MODE_GR] +
-		(u64)hist_count[ISC_HIS_CFG_MODE_GB];
-	avg >>= 1;
-
-	/* Green histogram is null, nothing to do */
-	if (!avg)
-		return;
-
-	for (c = ISC_HIS_CFG_MODE_GR; c <= ISC_HIS_CFG_MODE_B; c++) {
-		/*
-		 * the color offset is the minimum value of the histogram.
-		 * we stretch this color to the full range by substracting
-		 * this value from the color component.
-		 */
-		offset[c] = ctrls->hist_minmax[c][HIST_MIN_INDEX];
-		/*
-		 * The offset is always at least 1. If the offset is 1, we do
-		 * not need to adjust it, so our result must be zero.
-		 * the offset is computed in a histogram on 9 bits (0..512)
-		 * but the offset in register is based on
-		 * 12 bits pipeline (0..4096).
-		 * we need to shift with the 3 bits that the histogram is
-		 * ignoring
-		 */
-		ctrls->offset[c] = (offset[c] - 1) << 3;
-
-		/* the offset is then taken and converted to 2's complements */
-		if (!ctrls->offset[c])
-			ctrls->offset[c] = ISC_WB_O_ZERO_VAL;
-
-		/*
-		 * the stretch gain is the total number of histogram bins
-		 * divided by the actual range of color component (Max - Min)
-		 * If we compute gain like this, the actual color component
-		 * will be stretched to the full histogram.
-		 * We need to shift 9 bits for precision, we have 9 bits for
-		 * decimals
-		 */
-		s_gain[c] = (HIST_ENTRIES << 9) /
-			(ctrls->hist_minmax[c][HIST_MAX_INDEX] -
-			ctrls->hist_minmax[c][HIST_MIN_INDEX] + 1);
-
-		/*
-		 * Now we have to compute the gain w.r.t. the average.
-		 * Add/lose gain to the component towards the average.
-		 * If it happens that the component is zero, use the
-		 * fixed point value : 1.0 gain.
-		 */
-		if (hist_count[c])
-			gw_gain[c] = div_u64(avg << 9, hist_count[c]);
-		else
-			gw_gain[c] = 1 << 9;
-
-		/* multiply both gains and adjust for decimals */
-		ctrls->gain[c] = s_gain[c] * gw_gain[c];
-		ctrls->gain[c] >>= 9;
-	}
-}
-
-static void isc_awb_work(struct work_struct *w)
-{
-	struct isc_device *isc =
-		container_of(w, struct isc_device, awb_work);
-	struct regmap *regmap = isc->regmap;
-	struct isc_ctrls *ctrls = &isc->ctrls;
-	u32 hist_id = ctrls->hist_id;
-	u32 baysel;
-	unsigned long flags;
-	u32 min, max;
-
-	/* streaming is not active anymore */
-	if (isc->stop)
-		return;
-
-	if (ctrls->hist_stat != HIST_ENABLED)
-		return;
-
-	isc_hist_count(isc, &min, &max);
-	ctrls->hist_minmax[hist_id][HIST_MIN_INDEX] = min;
-	ctrls->hist_minmax[hist_id][HIST_MAX_INDEX] = max;
-
-	if (hist_id != ISC_HIS_CFG_MODE_B) {
-		hist_id++;
-	} else {
-		isc_wb_update(ctrls);
-		hist_id = ISC_HIS_CFG_MODE_GR;
-	}
-
-	ctrls->hist_id = hist_id;
-	baysel = isc->config.sd_format->cfa_baycfg << ISC_HIS_CFG_BAYSEL_SHIFT;
-
-	/* if no more auto white balance, reset controls. */
-	if (ctrls->awb == ISC_WB_NONE)
-		isc_reset_awb_ctrls(isc);
-
-	pm_runtime_get_sync(isc->dev);
-
-	/*
-	 * only update if we have all the required histograms and controls
-	 * if awb has been disabled, we need to reset registers as well.
-	 */
-	if (hist_id == ISC_HIS_CFG_MODE_GR || ctrls->awb == ISC_WB_NONE) {
-		/*
-		 * It may happen that DMA Done IRQ will trigger while we are
-		 * updating white balance registers here.
-		 * In that case, only parts of the controls have been updated.
-		 * We can avoid that by locking the section.
-		 */
-		spin_lock_irqsave(&isc->awb_lock, flags);
-		isc_update_awb_ctrls(isc);
-		spin_unlock_irqrestore(&isc->awb_lock, flags);
-
-		/*
-		 * if we are doing just the one time white balance adjustment,
-		 * we are basically done.
-		 */
-		if (ctrls->awb == ISC_WB_ONETIME) {
-			v4l2_info(&isc->v4l2_dev,
-				  "Completed one time white-balance adjustment.\n");
-			ctrls->awb = ISC_WB_NONE;
-		}
-	}
-	regmap_write(regmap, ISC_HIS_CFG, hist_id | baysel | ISC_HIS_CFG_RAR);
-	isc_update_profile(isc);
-	/* if awb has been disabled, we don't need to start another histogram */
-	if (ctrls->awb)
-		regmap_write(regmap, ISC_CTRLEN, ISC_CTRL_HISREQ);
-
-	pm_runtime_put_sync(isc->dev);
-}
-
-static int isc_s_ctrl(struct v4l2_ctrl *ctrl)
-{
-	struct isc_device *isc = container_of(ctrl->handler,
-					     struct isc_device, ctrls.handler);
-	struct isc_ctrls *ctrls = &isc->ctrls;
-
-	if (ctrl->flags & V4L2_CTRL_FLAG_INACTIVE)
-		return 0;
-
-	switch (ctrl->id) {
-	case V4L2_CID_BRIGHTNESS:
-		ctrls->brightness = ctrl->val & ISC_CBC_BRIGHT_MASK;
-		break;
-	case V4L2_CID_CONTRAST:
-		ctrls->contrast = ctrl->val & ISC_CBC_CONTRAST_MASK;
-		break;
-	case V4L2_CID_GAMMA:
-		ctrls->gamma_index = ctrl->val;
-		break;
-	case V4L2_CID_AUTO_WHITE_BALANCE:
-		if (ctrl->val == 1)
-			ctrls->awb = ISC_WB_AUTO;
-		else
-			ctrls->awb = ISC_WB_NONE;
-
-		/* we did not configure ISC yet */
-		if (!isc->config.sd_format)
-			break;
-
-		if (ctrls->hist_stat != HIST_ENABLED)
-			isc_reset_awb_ctrls(isc);
-
-		if (isc->ctrls.awb == ISC_WB_AUTO &&
-		    vb2_is_streaming(&isc->vb2_vidq) &&
-		    ISC_IS_FORMAT_RAW(isc->config.sd_format->mbus_code))
-			isc_set_histogram(isc, true);
-
-		break;
-	case V4L2_CID_DO_WHITE_BALANCE:
-		/* if AWB is enabled, do nothing */
-		if (ctrls->awb == ISC_WB_AUTO)
-			return 0;
-
-		ctrls->awb = ISC_WB_ONETIME;
-		isc_set_histogram(isc, true);
-		v4l2_dbg(1, debug, &isc->v4l2_dev,
-			 "One time white-balance started.\n");
-		break;
-	default:
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
-static const struct v4l2_ctrl_ops isc_ctrl_ops = {
-	.s_ctrl	= isc_s_ctrl,
-};
-
-static int isc_ctrl_init(struct isc_device *isc)
-{
-	const struct v4l2_ctrl_ops *ops = &isc_ctrl_ops;
-	struct isc_ctrls *ctrls = &isc->ctrls;
-	struct v4l2_ctrl_handler *hdl = &ctrls->handler;
-	int ret;
-
-	ctrls->hist_stat = HIST_INIT;
-	isc_reset_awb_ctrls(isc);
-
-	ret = v4l2_ctrl_handler_init(hdl, 5);
-	if (ret < 0)
-		return ret;
-
-	ctrls->brightness = 0;
-	ctrls->contrast = 256;
-
-	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_BRIGHTNESS, -1024, 1023, 1, 0);
-	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_CONTRAST, -2048, 2047, 1, 256);
-	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_GAMMA, 0, GAMMA_MAX, 1, 2);
-	v4l2_ctrl_new_std(hdl, ops, V4L2_CID_AUTO_WHITE_BALANCE, 0, 1, 1, 1);
-
-	/* do_white_balance is a button, so min,max,step,default are ignored */
-	isc->do_wb_ctrl = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_DO_WHITE_BALANCE,
-					    0, 0, 0, 0);
-
-	v4l2_ctrl_activate(isc->do_wb_ctrl, false);
-
-	v4l2_ctrl_handler_setup(hdl);
-
-	return 0;
-}
-
-static int isc_async_bound(struct v4l2_async_notifier *notifier,
-			    struct v4l2_subdev *subdev,
-			    struct v4l2_async_subdev *asd)
-{
-	struct isc_device *isc = container_of(notifier->v4l2_dev,
-					      struct isc_device, v4l2_dev);
-	struct isc_subdev_entity *subdev_entity =
-		container_of(notifier, struct isc_subdev_entity, notifier);
-
-	if (video_is_registered(&isc->video_dev)) {
-		v4l2_err(&isc->v4l2_dev, "only supports one sub-device.\n");
-		return -EBUSY;
-	}
-
-	subdev_entity->sd = subdev;
-
-	return 0;
-}
-
-static void isc_async_unbind(struct v4l2_async_notifier *notifier,
-			      struct v4l2_subdev *subdev,
-			      struct v4l2_async_subdev *asd)
-{
-	struct isc_device *isc = container_of(notifier->v4l2_dev,
-					      struct isc_device, v4l2_dev);
-	cancel_work_sync(&isc->awb_work);
-	video_unregister_device(&isc->video_dev);
-	v4l2_ctrl_handler_free(&isc->ctrls.handler);
-}
-
-static struct isc_format *find_format_by_code(unsigned int code, int *index)
-{
-	struct isc_format *fmt = &formats_list[0];
-	unsigned int i;
-
-	for (i = 0; i < ARRAY_SIZE(formats_list); i++) {
-		if (fmt->mbus_code == code) {
-			*index = i;
-			return fmt;
-		}
-
-		fmt++;
-	}
-
-	return NULL;
-}
-
-static int isc_formats_init(struct isc_device *isc)
-{
-	struct isc_format *fmt;
-	struct v4l2_subdev *subdev = isc->current_subdev->sd;
-	unsigned int num_fmts, i, j;
-	u32 list_size = ARRAY_SIZE(formats_list);
-	struct v4l2_subdev_mbus_code_enum mbus_code = {
-		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
-	};
-
-	num_fmts = 0;
-	while (!v4l2_subdev_call(subdev, pad, enum_mbus_code,
-	       NULL, &mbus_code)) {
-		mbus_code.index++;
-
-		fmt = find_format_by_code(mbus_code.code, &i);
-		if (!fmt) {
-			v4l2_warn(&isc->v4l2_dev, "Mbus code %x not supported\n",
-				  mbus_code.code);
-			continue;
-		}
-
-		fmt->sd_support = true;
-		num_fmts++;
-	}
-
-	if (!num_fmts)
-		return -ENXIO;
-
-	isc->num_user_formats = num_fmts;
-	isc->user_formats = devm_kcalloc(isc->dev,
-					 num_fmts, sizeof(*isc->user_formats),
-					 GFP_KERNEL);
-	if (!isc->user_formats)
-		return -ENOMEM;
-
-	fmt = &formats_list[0];
-	for (i = 0, j = 0; i < list_size; i++) {
-		if (fmt->sd_support)
-			isc->user_formats[j++] = fmt;
-		fmt++;
-	}
-
-	return 0;
-}
-
-static int isc_set_default_fmt(struct isc_device *isc)
-{
-	struct v4l2_format f = {
-		.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
-		.fmt.pix = {
-			.width		= VGA_WIDTH,
-			.height		= VGA_HEIGHT,
-			.field		= V4L2_FIELD_NONE,
-			.pixelformat	= isc->user_formats[0]->fourcc,
-		},
-	};
-	int ret;
-
-	ret = isc_try_fmt(isc, &f, NULL);
-	if (ret)
-		return ret;
-
-	isc->fmt = f;
-	return 0;
-}
-
-static int isc_async_complete(struct v4l2_async_notifier *notifier)
-{
-	struct isc_device *isc = container_of(notifier->v4l2_dev,
-					      struct isc_device, v4l2_dev);
-	struct video_device *vdev = &isc->video_dev;
-	struct vb2_queue *q = &isc->vb2_vidq;
-	int ret;
-
-	INIT_WORK(&isc->awb_work, isc_awb_work);
-
-	ret = v4l2_device_register_subdev_nodes(&isc->v4l2_dev);
-	if (ret < 0) {
-		v4l2_err(&isc->v4l2_dev, "Failed to register subdev nodes\n");
-		return ret;
-	}
-
-	isc->current_subdev = container_of(notifier,
-					   struct isc_subdev_entity, notifier);
-	mutex_init(&isc->lock);
-	init_completion(&isc->comp);
-
-	/* Initialize videobuf2 queue */
-	q->type			= V4L2_BUF_TYPE_VIDEO_CAPTURE;
-	q->io_modes		= VB2_MMAP | VB2_DMABUF | VB2_READ;
-	q->drv_priv		= isc;
-	q->buf_struct_size	= sizeof(struct isc_buffer);
-	q->ops			= &isc_vb2_ops;
-	q->mem_ops		= &vb2_dma_contig_memops;
-	q->timestamp_flags	= V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
-	q->lock			= &isc->lock;
-	q->min_buffers_needed	= 1;
-	q->dev			= isc->dev;
-
-	ret = vb2_queue_init(q);
-	if (ret < 0) {
-		v4l2_err(&isc->v4l2_dev,
-			 "vb2_queue_init() failed: %d\n", ret);
-		return ret;
-	}
-
-	/* Init video dma queues */
-	INIT_LIST_HEAD(&isc->dma_queue);
-	spin_lock_init(&isc->dma_queue_lock);
-	spin_lock_init(&isc->awb_lock);
-
-	ret = isc_formats_init(isc);
-	if (ret < 0) {
-		v4l2_err(&isc->v4l2_dev,
-			 "Init format failed: %d\n", ret);
-		return ret;
-	}
-
-	ret = isc_set_default_fmt(isc);
-	if (ret) {
-		v4l2_err(&isc->v4l2_dev, "Could not set default format\n");
-		return ret;
-	}
-
-	ret = isc_ctrl_init(isc);
-	if (ret) {
-		v4l2_err(&isc->v4l2_dev, "Init isc ctrols failed: %d\n", ret);
-		return ret;
-	}
-
-	/* Register video device */
-	strscpy(vdev->name, ATMEL_ISC_NAME, sizeof(vdev->name));
-	vdev->release		= video_device_release_empty;
-	vdev->fops		= &isc_fops;
-	vdev->ioctl_ops		= &isc_ioctl_ops;
-	vdev->v4l2_dev		= &isc->v4l2_dev;
-	vdev->vfl_dir		= VFL_DIR_RX;
-	vdev->queue		= q;
-	vdev->lock		= &isc->lock;
-	vdev->ctrl_handler	= &isc->ctrls.handler;
-	vdev->device_caps	= V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_CAPTURE;
-	video_set_drvdata(vdev, isc);
-
-	ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
-	if (ret < 0) {
-		v4l2_err(&isc->v4l2_dev,
-			 "video_register_device failed: %d\n", ret);
-		return ret;
-	}
-
-	return 0;
-}
-
-static const struct v4l2_async_notifier_operations isc_async_ops = {
-	.bound = isc_async_bound,
-	.unbind = isc_async_unbind,
-	.complete = isc_async_complete,
-};
-
-static void isc_subdev_cleanup(struct isc_device *isc)
-{
-	struct isc_subdev_entity *subdev_entity;
-
-	list_for_each_entry(subdev_entity, &isc->subdev_entities, list) {
-		v4l2_async_notifier_unregister(&subdev_entity->notifier);
-		v4l2_async_notifier_cleanup(&subdev_entity->notifier);
-	}
-
-	INIT_LIST_HEAD(&isc->subdev_entities);
-}
-
-static int isc_pipeline_init(struct isc_device *isc)
-{
-	struct device *dev = isc->dev;
-	struct regmap *regmap = isc->regmap;
-	struct regmap_field *regs;
-	unsigned int i;
-
-	/* WB-->CFA-->CC-->GAM-->CSC-->CBC-->SUB422-->SUB420 */
-	const struct reg_field regfields[ISC_PIPE_LINE_NODE_NUM] = {
-		REG_FIELD(ISC_WB_CTRL, 0, 0),
-		REG_FIELD(ISC_CFA_CTRL, 0, 0),
-		REG_FIELD(ISC_CC_CTRL, 0, 0),
-		REG_FIELD(ISC_GAM_CTRL, 0, 0),
-		REG_FIELD(ISC_GAM_CTRL, 1, 1),
-		REG_FIELD(ISC_GAM_CTRL, 2, 2),
-		REG_FIELD(ISC_GAM_CTRL, 3, 3),
-		REG_FIELD(ISC_CSC_CTRL, 0, 0),
-		REG_FIELD(ISC_CBC_CTRL, 0, 0),
-		REG_FIELD(ISC_SUB422_CTRL, 0, 0),
-		REG_FIELD(ISC_SUB420_CTRL, 0, 0),
-	};
-
-	for (i = 0; i < ISC_PIPE_LINE_NODE_NUM; i++) {
-		regs = devm_regmap_field_alloc(dev, regmap, regfields[i]);
-		if (IS_ERR(regs))
-			return PTR_ERR(regs);
-
-		isc->pipeline[i] =  regs;
-	}
-
-	return 0;
-}
-
-static int isc_parse_dt(struct device *dev, struct isc_device *isc)
-{
-	struct device_node *np = dev->of_node;
-	struct device_node *epn = NULL, *rem;
-	struct isc_subdev_entity *subdev_entity;
-	unsigned int flags;
-	int ret;
-
-	INIT_LIST_HEAD(&isc->subdev_entities);
-
-	while (1) {
-		struct v4l2_fwnode_endpoint v4l2_epn = { .bus_type = 0 };
-
-		epn = of_graph_get_next_endpoint(np, epn);
-		if (!epn)
-			return 0;
-
-		rem = of_graph_get_remote_port_parent(epn);
-		if (!rem) {
-			dev_notice(dev, "Remote device at %pOF not found\n",
-				   epn);
-			continue;
-		}
-
-		ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(epn),
-						 &v4l2_epn);
-		if (ret) {
-			of_node_put(rem);
-			ret = -EINVAL;
-			dev_err(dev, "Could not parse the endpoint\n");
-			break;
-		}
-
-		subdev_entity = devm_kzalloc(dev,
-					  sizeof(*subdev_entity), GFP_KERNEL);
-		if (!subdev_entity) {
-			of_node_put(rem);
-			ret = -ENOMEM;
-			break;
-		}
-
-		/* asd will be freed by the subsystem once it's added to the
-		 * notifier list
-		 */
-		subdev_entity->asd = kzalloc(sizeof(*subdev_entity->asd),
-					     GFP_KERNEL);
-		if (!subdev_entity->asd) {
-			of_node_put(rem);
-			ret = -ENOMEM;
-			break;
-		}
-
-		flags = v4l2_epn.bus.parallel.flags;
-
-		if (flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
-			subdev_entity->pfe_cfg0 = ISC_PFE_CFG0_HPOL_LOW;
-
-		if (flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
-			subdev_entity->pfe_cfg0 |= ISC_PFE_CFG0_VPOL_LOW;
-
-		if (flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
-			subdev_entity->pfe_cfg0 |= ISC_PFE_CFG0_PPOL_LOW;
-
-		if (v4l2_epn.bus_type == V4L2_MBUS_BT656)
-			subdev_entity->pfe_cfg0 |= ISC_PFE_CFG0_CCIR_CRC |
-					ISC_PFE_CFG0_CCIR656;
-
-		subdev_entity->asd->match_type = V4L2_ASYNC_MATCH_FWNODE;
-		subdev_entity->asd->match.fwnode =
-			of_fwnode_handle(rem);
-		list_add_tail(&subdev_entity->list, &isc->subdev_entities);
-	}
-
-	of_node_put(epn);
-	return ret;
-}
-
-/* regmap configuration */
-#define ATMEL_ISC_REG_MAX    0xbfc
-static const struct regmap_config isc_regmap_config = {
-	.reg_bits       = 32,
-	.reg_stride     = 4,
-	.val_bits       = 32,
-	.max_register	= ATMEL_ISC_REG_MAX,
-};
-
-static int atmel_isc_probe(struct platform_device *pdev)
-{
-	struct device *dev = &pdev->dev;
-	struct isc_device *isc;
-	struct resource *res;
-	void __iomem *io_base;
-	struct isc_subdev_entity *subdev_entity;
-	int irq;
-	int ret;
-
-	isc = devm_kzalloc(dev, sizeof(*isc), GFP_KERNEL);
-	if (!isc)
-		return -ENOMEM;
-
-	platform_set_drvdata(pdev, isc);
-	isc->dev = dev;
-
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	io_base = devm_ioremap_resource(dev, res);
-	if (IS_ERR(io_base))
-		return PTR_ERR(io_base);
-
-	isc->regmap = devm_regmap_init_mmio(dev, io_base, &isc_regmap_config);
-	if (IS_ERR(isc->regmap)) {
-		ret = PTR_ERR(isc->regmap);
-		dev_err(dev, "failed to init register map: %d\n", ret);
-		return ret;
-	}
-
-	irq = platform_get_irq(pdev, 0);
-	if (irq < 0) {
-		ret = irq;
-		dev_err(dev, "failed to get irq: %d\n", ret);
-		return ret;
-	}
-
-	ret = devm_request_irq(dev, irq, isc_interrupt, 0,
-			       ATMEL_ISC_NAME, isc);
-	if (ret < 0) {
-		dev_err(dev, "can't register ISR for IRQ %u (ret=%i)\n",
-			irq, ret);
-		return ret;
-	}
-
-	ret = isc_pipeline_init(isc);
-	if (ret)
-		return ret;
-
-	isc->hclock = devm_clk_get(dev, "hclock");
-	if (IS_ERR(isc->hclock)) {
-		ret = PTR_ERR(isc->hclock);
-		dev_err(dev, "failed to get hclock: %d\n", ret);
-		return ret;
-	}
-
-	ret = clk_prepare_enable(isc->hclock);
-	if (ret) {
-		dev_err(dev, "failed to enable hclock: %d\n", ret);
-		return ret;
-	}
-
-	ret = isc_clk_init(isc);
-	if (ret) {
-		dev_err(dev, "failed to init isc clock: %d\n", ret);
-		goto unprepare_hclk;
-	}
-
-	isc->ispck = isc->isc_clks[ISC_ISPCK].clk;
-
-	ret = clk_prepare_enable(isc->ispck);
-	if (ret) {
-		dev_err(dev, "failed to enable ispck: %d\n", ret);
-		goto unprepare_hclk;
-	}
-
-	/* ispck should be greater or equal to hclock */
-	ret = clk_set_rate(isc->ispck, clk_get_rate(isc->hclock));
-	if (ret) {
-		dev_err(dev, "failed to set ispck rate: %d\n", ret);
-		goto unprepare_clk;
-	}
-
-	ret = v4l2_device_register(dev, &isc->v4l2_dev);
-	if (ret) {
-		dev_err(dev, "unable to register v4l2 device.\n");
-		goto unprepare_clk;
-	}
-
-	ret = isc_parse_dt(dev, isc);
-	if (ret) {
-		dev_err(dev, "fail to parse device tree\n");
-		goto unregister_v4l2_device;
-	}
-
-	if (list_empty(&isc->subdev_entities)) {
-		dev_err(dev, "no subdev found\n");
-		ret = -ENODEV;
-		goto unregister_v4l2_device;
-	}
-
-	list_for_each_entry(subdev_entity, &isc->subdev_entities, list) {
-		v4l2_async_notifier_init(&subdev_entity->notifier);
-
-		ret = v4l2_async_notifier_add_subdev(&subdev_entity->notifier,
-						     subdev_entity->asd);
-		if (ret) {
-			fwnode_handle_put(subdev_entity->asd->match.fwnode);
-			kfree(subdev_entity->asd);
-			goto cleanup_subdev;
-		}
-
-		subdev_entity->notifier.ops = &isc_async_ops;
-
-		ret = v4l2_async_notifier_register(&isc->v4l2_dev,
-						   &subdev_entity->notifier);
-		if (ret) {
-			dev_err(dev, "fail to register async notifier\n");
-			goto cleanup_subdev;
-		}
-
-		if (video_is_registered(&isc->video_dev))
-			break;
-	}
-
-	pm_runtime_set_active(dev);
-	pm_runtime_enable(dev);
-	pm_request_idle(dev);
-
-	return 0;
-
-cleanup_subdev:
-	isc_subdev_cleanup(isc);
-
-unregister_v4l2_device:
-	v4l2_device_unregister(&isc->v4l2_dev);
-
-unprepare_clk:
-	clk_disable_unprepare(isc->ispck);
-unprepare_hclk:
-	clk_disable_unprepare(isc->hclock);
-
-	isc_clk_cleanup(isc);
-
-	return ret;
-}
-
-static int atmel_isc_remove(struct platform_device *pdev)
-{
-	struct isc_device *isc = platform_get_drvdata(pdev);
-
-	pm_runtime_disable(&pdev->dev);
-	clk_disable_unprepare(isc->ispck);
-	clk_disable_unprepare(isc->hclock);
-
-	isc_subdev_cleanup(isc);
-
-	v4l2_device_unregister(&isc->v4l2_dev);
-
-	isc_clk_cleanup(isc);
-
-	return 0;
-}
-
-static int __maybe_unused isc_runtime_suspend(struct device *dev)
-{
-	struct isc_device *isc = dev_get_drvdata(dev);
-
-	clk_disable_unprepare(isc->ispck);
-	clk_disable_unprepare(isc->hclock);
-
-	return 0;
-}
-
-static int __maybe_unused isc_runtime_resume(struct device *dev)
-{
-	struct isc_device *isc = dev_get_drvdata(dev);
-	int ret;
-
-	ret = clk_prepare_enable(isc->hclock);
-	if (ret)
-		return ret;
-
-	return clk_prepare_enable(isc->ispck);
-}
-
-static const struct dev_pm_ops atmel_isc_dev_pm_ops = {
-	SET_RUNTIME_PM_OPS(isc_runtime_suspend, isc_runtime_resume, NULL)
-};
-
-static const struct of_device_id atmel_isc_of_match[] = {
-	{ .compatible = "atmel,sama5d2-isc" },
-	{ }
-};
-MODULE_DEVICE_TABLE(of, atmel_isc_of_match);
-
-static struct platform_driver atmel_isc_driver = {
-	.probe	= atmel_isc_probe,
-	.remove	= atmel_isc_remove,
-	.driver	= {
-		.name		= ATMEL_ISC_NAME,
-		.pm		= &atmel_isc_dev_pm_ops,
-		.of_match_table = of_match_ptr(atmel_isc_of_match),
-	},
-};
-
-module_platform_driver(atmel_isc_driver);
-
-MODULE_AUTHOR("Songjun Wu <songjun.wu@xxxxxxxxxxxxx>");
-MODULE_DESCRIPTION("The V4L2 driver for Atmel-ISC");
-MODULE_LICENSE("GPL v2");
-MODULE_SUPPORTED_DEVICE("video");
diff --git a/drivers/media/platform/atmel/atmel-isc.h b/drivers/media/platform/atmel/atmel-isc.h
new file mode 100644
index 0000000..3ea97f1
--- /dev/null
+++ b/drivers/media/platform/atmel/atmel-isc.h
@@ -0,0 +1,192 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Microchip Image Sensor Controller (ISC) driver header file
+ *
+ * Copyright (C) 2016-2019 Microchip Technology, Inc.
+ *
+ * Author: Songjun Wu <songjun.wu@xxxxxxxxxxxxx>
+ * Author: Eugen Hristev <eugen.hristev@xxxxxxxxxxxxx>
+ *
+ */
+#ifndef _ATMEL_ISC_H_
+
+#define ISC_MAX_SUPPORT_WIDTH   2592
+#define ISC_MAX_SUPPORT_HEIGHT  1944
+
+#define ISC_CLK_MAX_DIV		255
+
+enum isc_clk_id {
+	ISC_ISPCK = 0,
+	ISC_MCK = 1,
+};
+
+struct isc_clk {
+	struct clk_hw   hw;
+	struct clk      *clk;
+	struct regmap   *regmap;
+	spinlock_t	lock;
+	u8		id;
+	u8		parent_id;
+	u32		div;
+	struct device	*dev;
+};
+
+#define to_isc_clk(hw) container_of(hw, struct isc_clk, hw)
+
+struct isc_buffer {
+	struct vb2_v4l2_buffer  vb;
+	struct list_head	list;
+};
+
+struct isc_subdev_entity {
+	struct v4l2_subdev		*sd;
+	struct v4l2_async_subdev	*asd;
+	struct v4l2_async_notifier      notifier;
+
+	u32 pfe_cfg0;
+
+	struct list_head list;
+};
+
+/*
+ * struct isc_format - ISC media bus format information
+			This structure represents the interface between the ISC
+			and the sensor. It's the input format received by
+			the ISC.
+ * @fourcc:		Fourcc code for this format
+ * @mbus_code:		V4L2 media bus format code.
+ * @cfa_baycfg:		If this format is RAW BAYER, indicate the type of bayer.
+			this is either BGBG, RGRG, etc.
+ * @pfe_cfg0_bps:	Number of hardware data lines connected to the ISC
+ */
+
+struct isc_format {
+	u32	fourcc;
+	u32	mbus_code;
+	u32	cfa_baycfg;
+
+	bool	sd_support;
+	u32	pfe_cfg0_bps;
+};
+
+/* Pipeline bitmap */
+#define WB_ENABLE	BIT(0)
+#define CFA_ENABLE	BIT(1)
+#define CC_ENABLE	BIT(2)
+#define GAM_ENABLE	BIT(3)
+#define GAM_BENABLE	BIT(4)
+#define GAM_GENABLE	BIT(5)
+#define GAM_RENABLE	BIT(6)
+#define CSC_ENABLE	BIT(7)
+#define CBC_ENABLE	BIT(8)
+#define SUB422_ENABLE	BIT(9)
+#define SUB420_ENABLE	BIT(10)
+
+#define GAM_ENABLES	(GAM_RENABLE | GAM_GENABLE | GAM_BENABLE | GAM_ENABLE)
+
+/*
+ * struct fmt_config - ISC format configuration and internal pipeline
+			This structure represents the internal configuration
+			of the ISC.
+			It also holds the format that ISC will present to v4l2.
+ * @sd_format:		Pointer to an isc_format struct that holds the sensor
+			configuration.
+ * @fourcc:		Fourcc code for this format.
+ * @bpp:		Bytes per pixel in the current format.
+ * @rlp_cfg_mode:	Configuration of the RLP (rounding, limiting packaging)
+ * @dcfg_imode:		Configuration of the input of the DMA module
+ * @dctrl_dview:	Configuration of the output of the DMA module
+ * @bits_pipeline:	Configuration of the pipeline, which modules are enabled
+ */
+struct fmt_config {
+	struct isc_format	*sd_format;
+
+	u32			fourcc;
+	u8			bpp;
+
+	u32			rlp_cfg_mode;
+	u32			dcfg_imode;
+	u32			dctrl_dview;
+
+	u32			bits_pipeline;
+};
+
+#define HIST_ENTRIES		512
+#define HIST_BAYER		(ISC_HIS_CFG_MODE_B + 1)
+
+enum{
+	HIST_INIT = 0,
+	HIST_ENABLED,
+	HIST_DISABLED,
+};
+
+struct isc_ctrls {
+	struct v4l2_ctrl_handler handler;
+
+	u32 brightness;
+	u32 contrast;
+	u8 gamma_index;
+#define ISC_WB_NONE	0
+#define ISC_WB_AUTO	1
+#define ISC_WB_ONETIME	2
+	u8 awb;
+
+	/* one for each component : GR, R, GB, B */
+	u32 gain[HIST_BAYER];
+	u32 offset[HIST_BAYER];
+
+	u32 hist_entry[HIST_ENTRIES];
+	u32 hist_count[HIST_BAYER];
+	u8 hist_id;
+	u8 hist_stat;
+#define HIST_MIN_INDEX		0
+#define HIST_MAX_INDEX		1
+	u32 hist_minmax[HIST_BAYER][2];
+};
+
+#define ISC_PIPE_LINE_NODE_NUM	11
+
+struct isc_device {
+	struct regmap		*regmap;
+	struct clk		*hclock;
+	struct clk		*ispck;
+	struct isc_clk		isc_clks[2];
+
+	struct device		*dev;
+	struct v4l2_device	v4l2_dev;
+	struct video_device	video_dev;
+
+	struct vb2_queue	vb2_vidq;
+	spinlock_t		dma_queue_lock;
+	struct list_head	dma_queue;
+	struct isc_buffer	*cur_frm;
+	unsigned int		sequence;
+	bool			stop;
+	struct completion	comp;
+
+	struct v4l2_format	fmt;
+	struct isc_format	**user_formats;
+	unsigned int		num_user_formats;
+
+	struct fmt_config	config;
+	struct fmt_config	try_config;
+
+	struct isc_ctrls	ctrls;
+	struct v4l2_ctrl	*do_wb_ctrl;
+	struct work_struct	awb_work;
+
+	struct mutex		lock;
+	spinlock_t		awb_lock;
+
+	struct regmap_field	*pipeline[ISC_PIPE_LINE_NODE_NUM];
+
+	struct isc_subdev_entity	*current_subdev;
+	struct list_head		subdev_entities;
+};
+
+#define GAMMA_MAX	2
+#define GAMMA_ENTRIES	64
+
+#define ATMEL_ISC_NAME "atmel-isc"
+
+#endif
diff --git a/drivers/media/platform/atmel/atmel-sama5d2-isc.c b/drivers/media/platform/atmel/atmel-sama5d2-isc.c
new file mode 100644
index 0000000..7393a21
--- /dev/null
+++ b/drivers/media/platform/atmel/atmel-sama5d2-isc.c
@@ -0,0 +1,365 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Microchip Image Sensor Controller (ISC) driver
+ *
+ * Copyright (C) 2016-2019 Microchip Technology, Inc.
+ *
+ * Author: Songjun Wu <songjun.wu@xxxxxxxxxxxxx>
+ * Author: Eugen Hristev <eugen.hristev@xxxxxxxxxxxxx>
+ *
+ *
+ * Sensor-->PFE-->WB-->CFA-->CC-->GAM-->CSC-->CBC-->SUB-->RLP-->DMA
+ *
+ * ISC video pipeline integrates the following submodules:
+ * PFE: Parallel Front End to sample the camera sensor input stream
+ *  WB: Programmable white balance in the Bayer domain
+ * CFA: Color filter array interpolation module
+ *  CC: Programmable color correction
+ * GAM: Gamma correction
+ * CSC: Programmable color space conversion
+ * CBC: Contrast and Brightness control
+ * SUB: This module performs YCbCr444 to YCbCr420 chrominance subsampling
+ * RLP: This module performs rounding, range limiting
+ *      and packing of the incoming data
+ */
+
+#include <linux/clk.h>
+#include <linux/clkdev.h>
+#include <linux/clk-provider.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/math64.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_graph.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/videodev2.h>
+
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-event.h>
+#include <media/v4l2-image-sizes.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-fwnode.h>
+#include <media/v4l2-subdev.h>
+#include <media/videobuf2-dma-contig.h>
+
+#include "atmel-isc-regs.h"
+#include "atmel-isc.h"
+
+#define ISC_MAX_SUPPORT_WIDTH   2592
+#define ISC_MAX_SUPPORT_HEIGHT  1944
+
+#define ISC_CLK_MAX_DIV		255
+
+extern struct isc_format formats_list[];
+extern struct isc_format controller_formats[];
+extern const u32 isc_gamma_table[GAMMA_MAX + 1][GAMMA_ENTRIES];
+extern const struct regmap_config isc_regmap_config;
+extern const struct v4l2_async_notifier_operations isc_async_ops;
+
+extern irqreturn_t isc_interrupt(int irq, void *dev_id);
+extern int isc_pipeline_init(struct isc_device *isc);
+extern int isc_clk_init(struct isc_device *isc);
+extern void isc_subdev_cleanup(struct isc_device *isc);
+extern void isc_clk_cleanup(struct isc_device *isc);
+
+unsigned int debug;
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "debug level (0-2)");
+
+unsigned int sensor_preferred = 1;
+module_param(sensor_preferred, uint, 0644);
+MODULE_PARM_DESC(sensor_preferred,
+		 "Sensor is preferred to output the specified format (1-on 0-off), default 1");
+
+static int isc_parse_dt(struct device *dev, struct isc_device *isc)
+{
+	struct device_node *np = dev->of_node;
+	struct device_node *epn = NULL, *rem;
+	struct isc_subdev_entity *subdev_entity;
+	unsigned int flags;
+	int ret;
+
+	INIT_LIST_HEAD(&isc->subdev_entities);
+
+	while (1) {
+		struct v4l2_fwnode_endpoint v4l2_epn = { .bus_type = 0 };
+
+		epn = of_graph_get_next_endpoint(np, epn);
+		if (!epn)
+			return 0;
+
+		rem = of_graph_get_remote_port_parent(epn);
+		if (!rem) {
+			dev_notice(dev, "Remote device at %pOF not found\n",
+				   epn);
+			continue;
+		}
+
+		ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(epn),
+						 &v4l2_epn);
+		if (ret) {
+			of_node_put(rem);
+			ret = -EINVAL;
+			dev_err(dev, "Could not parse the endpoint\n");
+			break;
+		}
+
+		subdev_entity = devm_kzalloc(dev,
+					  sizeof(*subdev_entity), GFP_KERNEL);
+		if (!subdev_entity) {
+			of_node_put(rem);
+			ret = -ENOMEM;
+			break;
+		}
+
+		/* asd will be freed by the subsystem once it's added to the
+		 * notifier list
+		 */
+		subdev_entity->asd = kzalloc(sizeof(*subdev_entity->asd),
+					     GFP_KERNEL);
+		if (!subdev_entity->asd) {
+			of_node_put(rem);
+			ret = -ENOMEM;
+			break;
+		}
+
+		flags = v4l2_epn.bus.parallel.flags;
+
+		if (flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
+			subdev_entity->pfe_cfg0 = ISC_PFE_CFG0_HPOL_LOW;
+
+		if (flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
+			subdev_entity->pfe_cfg0 |= ISC_PFE_CFG0_VPOL_LOW;
+
+		if (flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
+			subdev_entity->pfe_cfg0 |= ISC_PFE_CFG0_PPOL_LOW;
+
+		if (v4l2_epn.bus_type == V4L2_MBUS_BT656)
+			subdev_entity->pfe_cfg0 |= ISC_PFE_CFG0_CCIR_CRC |
+					ISC_PFE_CFG0_CCIR656;
+
+		subdev_entity->asd->match_type = V4L2_ASYNC_MATCH_FWNODE;
+		subdev_entity->asd->match.fwnode =
+			of_fwnode_handle(rem);
+		list_add_tail(&subdev_entity->list, &isc->subdev_entities);
+	}
+
+	of_node_put(epn);
+	return ret;
+}
+
+static int atmel_isc_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct isc_device *isc;
+	struct resource *res;
+	void __iomem *io_base;
+	struct isc_subdev_entity *subdev_entity;
+	int irq;
+	int ret;
+
+	isc = devm_kzalloc(dev, sizeof(*isc), GFP_KERNEL);
+	if (!isc)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, isc);
+	isc->dev = dev;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	io_base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(io_base))
+		return PTR_ERR(io_base);
+
+	isc->regmap = devm_regmap_init_mmio(dev, io_base, &isc_regmap_config);
+	if (IS_ERR(isc->regmap)) {
+		ret = PTR_ERR(isc->regmap);
+		dev_err(dev, "failed to init register map: %d\n", ret);
+		return ret;
+	}
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		ret = irq;
+		dev_err(dev, "failed to get irq: %d\n", ret);
+		return ret;
+	}
+
+	ret = devm_request_irq(dev, irq, isc_interrupt, 0,
+			       ATMEL_ISC_NAME, isc);
+	if (ret < 0) {
+		dev_err(dev, "can't register ISR for IRQ %u (ret=%i)\n",
+			irq, ret);
+		return ret;
+	}
+
+	ret = isc_pipeline_init(isc);
+	if (ret)
+		return ret;
+
+	isc->hclock = devm_clk_get(dev, "hclock");
+	if (IS_ERR(isc->hclock)) {
+		ret = PTR_ERR(isc->hclock);
+		dev_err(dev, "failed to get hclock: %d\n", ret);
+		return ret;
+	}
+
+	ret = clk_prepare_enable(isc->hclock);
+	if (ret) {
+		dev_err(dev, "failed to enable hclock: %d\n", ret);
+		return ret;
+	}
+
+	ret = isc_clk_init(isc);
+	if (ret) {
+		dev_err(dev, "failed to init isc clock: %d\n", ret);
+		goto unprepare_hclk;
+	}
+
+	isc->ispck = isc->isc_clks[ISC_ISPCK].clk;
+
+	ret = clk_prepare_enable(isc->ispck);
+	if (ret) {
+		dev_err(dev, "failed to enable ispck: %d\n", ret);
+		goto unprepare_hclk;
+	}
+
+	/* ispck should be greater or equal to hclock */
+	ret = clk_set_rate(isc->ispck, clk_get_rate(isc->hclock));
+	if (ret) {
+		dev_err(dev, "failed to set ispck rate: %d\n", ret);
+		goto unprepare_clk;
+	}
+
+	ret = v4l2_device_register(dev, &isc->v4l2_dev);
+	if (ret) {
+		dev_err(dev, "unable to register v4l2 device.\n");
+		goto unprepare_clk;
+	}
+
+	ret = isc_parse_dt(dev, isc);
+	if (ret) {
+		dev_err(dev, "fail to parse device tree\n");
+		goto unregister_v4l2_device;
+	}
+
+	if (list_empty(&isc->subdev_entities)) {
+		dev_err(dev, "no subdev found\n");
+		ret = -ENODEV;
+		goto unregister_v4l2_device;
+	}
+
+	list_for_each_entry(subdev_entity, &isc->subdev_entities, list) {
+		v4l2_async_notifier_init(&subdev_entity->notifier);
+
+		ret = v4l2_async_notifier_add_subdev(&subdev_entity->notifier,
+						     subdev_entity->asd);
+		if (ret) {
+			fwnode_handle_put(subdev_entity->asd->match.fwnode);
+			kfree(subdev_entity->asd);
+			goto cleanup_subdev;
+		}
+
+		subdev_entity->notifier.ops = &isc_async_ops;
+
+		ret = v4l2_async_notifier_register(&isc->v4l2_dev,
+						   &subdev_entity->notifier);
+		if (ret) {
+			dev_err(dev, "fail to register async notifier\n");
+			goto cleanup_subdev;
+		}
+
+		if (video_is_registered(&isc->video_dev))
+			break;
+	}
+
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+	pm_request_idle(dev);
+
+	return 0;
+
+cleanup_subdev:
+	isc_subdev_cleanup(isc);
+
+unregister_v4l2_device:
+	v4l2_device_unregister(&isc->v4l2_dev);
+
+unprepare_clk:
+	clk_disable_unprepare(isc->ispck);
+unprepare_hclk:
+	clk_disable_unprepare(isc->hclock);
+
+	isc_clk_cleanup(isc);
+
+	return ret;
+}
+
+static int atmel_isc_remove(struct platform_device *pdev)
+{
+	struct isc_device *isc = platform_get_drvdata(pdev);
+
+	pm_runtime_disable(&pdev->dev);
+	clk_disable_unprepare(isc->ispck);
+	clk_disable_unprepare(isc->hclock);
+
+	isc_subdev_cleanup(isc);
+
+	v4l2_device_unregister(&isc->v4l2_dev);
+
+	isc_clk_cleanup(isc);
+
+	return 0;
+}
+
+static int __maybe_unused isc_runtime_suspend(struct device *dev)
+{
+	struct isc_device *isc = dev_get_drvdata(dev);
+
+	clk_disable_unprepare(isc->ispck);
+	clk_disable_unprepare(isc->hclock);
+
+	return 0;
+}
+
+static int __maybe_unused isc_runtime_resume(struct device *dev)
+{
+	struct isc_device *isc = dev_get_drvdata(dev);
+	int ret;
+
+	ret = clk_prepare_enable(isc->hclock);
+	if (ret)
+		return ret;
+
+	return clk_prepare_enable(isc->ispck);
+}
+
+static const struct dev_pm_ops atmel_isc_dev_pm_ops = {
+	SET_RUNTIME_PM_OPS(isc_runtime_suspend, isc_runtime_resume, NULL)
+};
+
+static const struct of_device_id atmel_isc_of_match[] = {
+	{ .compatible = "atmel,sama5d2-isc" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, atmel_isc_of_match);
+
+static struct platform_driver atmel_isc_driver = {
+	.probe	= atmel_isc_probe,
+	.remove	= atmel_isc_remove,
+	.driver	= {
+		.name		= ATMEL_ISC_NAME,
+		.pm		= &atmel_isc_dev_pm_ops,
+		.of_match_table = of_match_ptr(atmel_isc_of_match),
+	},
+};
+
+module_platform_driver(atmel_isc_driver);
+
+MODULE_AUTHOR("Songjun Wu <songjun.wu@xxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("The V4L2 driver for Atmel-ISC");
+MODULE_LICENSE("GPL v2");
+MODULE_SUPPORTED_DEVICE("video");
-- 
2.7.4