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[PATCH v1 8/9] drm/doc: Add initial komeda driver documentation




Signed-off-by: James (Qian) Wang <james.qian.wang@xxxxxxx>
---
 Documentation/gpu/drivers.rst    |   1 +
 Documentation/gpu/komeda-kms.rst | 483 +++++++++++++++++++++++++++++++
 2 files changed, 484 insertions(+)
 create mode 100644 Documentation/gpu/komeda-kms.rst

diff --git a/Documentation/gpu/drivers.rst b/Documentation/gpu/drivers.rst
index 7c1672118a73..978e6da9bbff 100644
--- a/Documentation/gpu/drivers.rst
+++ b/Documentation/gpu/drivers.rst
@@ -17,6 +17,7 @@ GPU Driver Documentation
    vkms
    bridge/dw-hdmi
    xen-front
+   komeda-kms
 
 .. only::  subproject and html
 
diff --git a/Documentation/gpu/komeda-kms.rst b/Documentation/gpu/komeda-kms.rst
new file mode 100644
index 000000000000..8af925ca0869
--- /dev/null
+++ b/Documentation/gpu/komeda-kms.rst
@@ -0,0 +1,483 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+==============================
+ drm/komeda ARM display driver
+==============================
+
+The drm/komeda driver supports for the ARM display processor D71 and later
+IPs, this document is for giving a brief overview of driver design: how it
+works and why design it like that.
+
+Overview of D71 like display IPs
+================================
+
+From D71, Arm display IP begins to adopt a flexible and modularized
+architecture. A display pipeline is made up of multiple individual and
+functional pipeline stages called components, and every component has some
+specific capabilities that can give the flowed pipeline pixel data a
+particular processing.
+
+Typical D71 components:
+
+Layer
+-----
+Layer is the first pipeline stage, which is for preparing the pixel data
+for the next stage. It fetches the pixel from memory, decodes it if it's
+AFBC, rotates the source image, unpacks or converts YUV pixels to the device
+internal RGB pixels, then adjust the color_space of pixels if need.
+
+Scaler
+------
+As its name, scaler is taking responsability for scaling, and D71 also
+supports image enhancements by scaler.
+The usage of scaler is very flexible and can be connected to layer output
+for layer scaling, or connected to compositor and scale the whole display
+frame and then feed the output data into wb_layer which will then write it
+into memory.
+
+Compositor (compiz)
+-------------------
+Compositor is for blending multiple layers or pixel data flows into one
+single display frame, and its output frame can be fed into post image
+processor and then on the monitor or fed into wb_layer and written to memory
+at the same time. And user also can insert a scaler between compositor and
+wb_layer to down scale the display frame first and then writing to memory.
+
+Writeback Layer (wb_layer)
+--------------------------
+Writeback layer do the opposite things of Layer, Which connect to compiz and try
+to write the composition result to memory.
+
+Post image processor (improc)
+-----------------------------
+Post image processor is for adjusting frame data like gamma and color space
+to fit the requirements of the monitor.
+
+Timing controller (timing_ctrlr)
+--------------------------------
+Final stage of display pipeline, Timing controller is not for the pixel
+handling, but only for controlling the display timing.
+
+Merger
+------
+D71 scaler mostly only has half the horizontal input/output capabilities compare
+with Layer, Like if Layer supports 4K input size, the scaler only can supports
+2K input/output in some time. To achieve the fully frame scaling, D71 introduce
+Layer Split, which split the whole image to two half part and feed them to two
+Layers A and B, and do the scaling independently, after scaling the result need
+to be feed to merger to merge two part image, and then output to compiz.
+
+Splitter
+--------
+Similar to Layer Split, but Splitter is used for writeback, which split the
+compiz result to two part and then feed them to two scaler.
+
+Possible D71 Pipeline usage
+===========================
+
+Benefit from the modularized architecture, D71 pipelines can be easily adjusted
+to fit different usages, following are some typical pipeline data flow
+configurations:
+
+Single pipeline data flow
+-------------------------
+
+.. kernel-render:: DOT
+   :alt: Single pipeline digraph
+   :caption: Single pipeline data flow
+
+   digraph single_ppl {
+      rankdir=LR;
+
+      subgraph {
+         "Memory";
+         "Monitor";
+      }
+
+      subgraph cluster_pipeline {
+          style=dashed
+          node [shape=box]
+          {
+              node [bgcolor=grey style=dashed]
+              "Scaler-0";
+              "Scaler-1";
+              "Scaler-0/1"
+          }
+
+         node [bgcolor=grey style=filled]
+         "Layer-0" -> "Scaler-0"
+         "Layer-1" -> "Scaler-0"
+         "Layer-2" -> "Scaler-1"
+         "Layer-3" -> "Scaler-1"
+
+         "Layer-0" -> "Compiz"
+         "Layer-1" -> "Compiz"
+         "Layer-2" -> "Compiz"
+         "Layer-3" -> "Compiz"
+         "Scaler-0" -> "Compiz"
+         "Scaler-1" -> "Compiz"
+
+         "Compiz" -> "Scaler-0/1" -> "Wb_layer"
+         "Compiz" -> "Improc" -> "Timing Controller"
+      }
+
+      "Wb_layer" -> "Memory"
+      "Timing Controller" -> "Monitor"
+   }
+
+Dual pipeline with Slave enabled
+--------------------------------
+
+If pipeline_B is free, D71 supports redirect its compositor output to
+pipeline_A as an input of compositor of pipeline_A, then pipeline_B doesn't
+have its output and work as a slave of pipeline_A.
+NOTE: Since the compiz component doesn't output alpha value, the slave pipeline
+only can be used for bottom layers composition.
+
+.. kernel-render:: DOT
+   :alt: Slave pipeline digraph
+   :caption: Slave pipeline enabled data flow
+
+   digraph slave_ppl {
+      rankdir=LR;
+
+      subgraph {
+         "Memory";
+         "Monitor";
+      }
+      node [shape=box]
+      subgraph cluster_pipeline_slave {
+          style=dashed
+          label="Slave Pipeline_B"
+          node [shape=box]
+          {
+              node [bgcolor=grey style=dashed]
+              "Slave.Scaler-0";
+              "Slave.Scaler-1";
+          }
+
+         node [bgcolor=grey style=filled]
+         "Slave.Layer-0" -> "Slave.Scaler-0"
+         "Slave.Layer-1" -> "Slave.Scaler-0"
+         "Slave.Layer-2" -> "Slave.Scaler-1"
+         "Slave.Layer-3" -> "Slave.Scaler-1"
+
+         "Slave.Layer-0" -> "Slave.Compiz"
+         "Slave.Layer-1" -> "Slave.Compiz"
+         "Slave.Layer-2" -> "Slave.Compiz"
+         "Slave.Layer-3" -> "Slave.Compiz"
+         "Slave.Scaler-0" -> "Slave.Compiz"
+         "Slave.Scaler-1" -> "Slave.Compiz"
+      }
+
+      subgraph cluster_pipeline_master {
+          style=dashed
+          label="Master Pipeline_A"
+          node [shape=box]
+          {
+              node [bgcolor=grey style=dashed]
+              "Scaler-0";
+              "Scaler-1";
+              "Scaler-0/1"
+          }
+
+         node [bgcolor=grey style=filled]
+         "Layer-0" -> "Scaler-0"
+         "Layer-1" -> "Scaler-0"
+         "Layer-2" -> "Scaler-1"
+         "Layer-3" -> "Scaler-1"
+
+         "Slave.Compiz" -> "Compiz"
+         "Layer-0" -> "Compiz"
+         "Layer-1" -> "Compiz"
+         "Layer-2" -> "Compiz"
+         "Layer-3" -> "Compiz"
+         "Scaler-0" -> "Compiz"
+         "Scaler-1" -> "Compiz"
+
+         "Compiz" -> "Scaler-0/1" -> "Wb_layer"
+         "Compiz" -> "Improc" -> "Timing Controller"
+      }
+
+      "Wb_layer" -> "Memory"
+      "Timing Controller" -> "Monitor"
+   }
+
+Sub-pipelines for input and output
+----------------------------------
+
+A complete display pipeline can be easily dividied into three sub-pipelines
+according to the in/out usage.
+
+Layer(input) pipeline
+~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-render:: DOT
+   :alt: Layer data digraph
+   :caption: Layer (input) data flow
+
+   digraph layer_data_flow {
+      rankdir=LR;
+      node [shape=box]
+
+      {
+         node [bgcolor=grey style=dashed]
+           "Scaler-n";
+      }
+
+      "Layer-n" -> "Scaler-n" -> "Compiz"
+   }
+
+.. kernel-render:: DOT
+   :alt: Layer Split digraph
+   :caption: Layer Split pipeline
+
+   digraph layer_data_flow {
+      rankdir=LR;
+      node [shape=box]
+
+      "Layer-0/1" -> "Scaler-0" -> "Merger"
+      "Layer-2/3" -> "Scaler-1" -> "Merger"
+      "Merger" -> "Compiz"
+   }
+
+Writeback(output) pipeline
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+.. kernel-render:: DOT
+   :alt: writeback digraph
+   :caption: Writeback(output) data flow
+
+   digraph writeback_data_flow {
+      rankdir=LR;
+      node [shape=box]
+
+      {
+         node [bgcolor=grey style=dashed]
+           "Scaler-n";
+      }
+
+      "Compiz" -> "Scaler-n" -> "Wb_layer"
+   }
+
+.. kernel-render:: DOT
+   :alt: split writeback digraph
+   :caption: Writeback(output) Split data flow
+
+   digraph writeback_data_flow {
+      rankdir=LR;
+      node [shape=box]
+
+      "Compiz" -> "Splitter"
+      "Splitter" -> "Scaler-0" -> "Merger"
+      "Splitter" -> "Scaler-1" -> "Merger"
+      "Merger" -> "Wb_layer"
+   }
+
+Display output pipeline
+~~~~~~~~~~~~~~~~~~~~~~~
+.. kernel-render:: DOT
+   :alt: display digraph
+   :caption: display output data flow
+
+   digraph single_ppl {
+      rankdir=LR;
+      node [shape=box]
+
+      "Compiz" -> "Improc" -> "Timing Controller"
+   }
+
+In the following section we'll see these three sub-pipelines will be handled
+by KMS-plane/wb_conn/crtc respectively.
+
+Komeda Resource abstraction
+===========================
+
+struct komeda_pipeline/component
+--------------------------------
+
+To fully utilize and easily access/configure the HW, driver side also use a
+similar architecture: Pipeline/Component to describe the HW features and
+capabilities. and a specific component includes two part:
+
+-  Data flow controlling.
+-  Specific component capabilities and features.
+
+So driver defines common header struct komeda_component to describe the data
+flow controlling. and all specific component are subclass of this base structure.
+
+.. kernel-doc:: drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h
+   :internal:
+
+Resource discovery and initialization
+=====================================
+
+Pipeline and component are used to describe how to handle the pixel data.
+We still need a @struct komeda_dev to describe the whole view of the device, and
+the control-abilites of device.
+
+Now we have &komeda_dev, &komeda_pipeline, &komeda_component, but how to fill dev
+with pipelines. Since komeda is not only for D71 but also intended for later IPs,
+of course we’d better share as much as possible between different IPs, to
+achieve it split komeda device into two layers: CORE and CHIP.
+
+-   CORE: for common features and capabilities handling.
+-   CHIP: for register program and HW specific feature (limitition) handling.
+
+CORE access to CHIP by three chip func:
+
+-   struct komeda_dev_funcs
+-   struct komeda_pipeline_funcs
+-   struct komeda_component_funcs
+
+.. kernel-doc:: drivers/gpu/drm/arm/display/komeda/komeda_dev.h
+   :internal:
+
+Format handling
+===============
+
+.. kernel-doc:: drivers/gpu/drm/arm/display/komeda/komeda_format_caps.h
+   :internal:
+.. kernel-doc:: drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.h
+   :internal:
+
+Attach komeda_dev to DRM-KMS
+============================
+
+Komeda abstracts resources by pipeline/component, but DRM-KMS uses
+crtc/plane/connector. one KMS-obj can not represent only one single component,
+since the requirements of a single KMS object cannot simply be achieved by a
+single component, usually that needs multiple components to fit the requirement.
+Like set mode, gamma, ctm for KMS all target on CRTC-obj, but komeda needs
+compiz, improc and timing_ctrlr to work together to fit these requirements.
+And a KMS-Plane may requires multiple komeda resources: layer/scaler/compiz.
+
+So, One KMS-Obj represents a sub-pipeline of komeda resources.
+
+-   Plane: `Layer(input) pipeline`_
+-   Wb_connector: `Writeback(output) pipeline`_
+-   Crtc: `Display output pipeline`_
+
+So, for komeda, we treat KMS crtc/plane/connector as users of pipeline and
+component, and one time a pipeline/component only can be used by one user.
+And pipeline/component will be treated as private object of DRM-KMS, the state
+will be managed drm_atomic_state as well.
+
+How to map plane to Layer(input) pipeline
+-----------------------------------------
+
+Komeda has mutiple Layer input pipelines, see:
+-   `Single pipeline data flow`_
+-   `Dual pipeline with Slave enabled`_
+
+the easist way is binding a plane to a fixed Layer pipeline. but consider the
+komeda capabilities:
+
+-   Layer Split, See `Layer(input) pipeline`_
+
+    Which actually handles a image by two Layer pipelines. if one plane only
+    represents a fixed Layer, then the Layer_Split need to be handled in user
+    mode, for configure the pipeline as Layer_Split, user need to so much
+    details of HW, and pass down lots of private properties.
+    But if handle it in kernel the logic will be smooth and simple.
+
+-   Slave pipeline, See `Dual pipeline with Slave enabled`_
+
+    Since the compiz component doesn't output alpha value, the slave pipeline
+    only can be used for bottom layers composition, komeda driver wants to hide
+    this limitation to user, the way is pickup suitable Layer according to
+    Plane->zpos.
+
+    Slave pipeline capabilities of komeda also means the plane in komeda is CRTC
+    shareable. assign real Layer to plane in kernal according to the real HW
+    usage and state can also easy the user driver for the sharable plane.
+
+So for komeda, the KMS-plane doesn't represent a fixed komeda layer pipeline,
+but mutiple Layers with same capabilities, komeda will select one or more Layers
+to fit the requirement of one KMS-plane.
+
+Make component/pipeline to be drm_private_obj
+---------------------------------------------
+
+Add :c:type:`drm_private_obj` to :c:type:`komeda_component`, :c:type:`komeda_pipeline`
+
+.. code-block:: c
+
+    struct komeda_component {
+        struct drm_private_obj obj;
+        …
+    }
+
+    struct komeda_pipeline {
+        struct drm_private_obj obj;
+        …
+    }
+
+Tracking component_state/pipeline_state by drm_atomic_state
+-----------------------------------------------------------
+
+Add :c:type:`drm_private_state` and user to :c:type:`komeda_component_state`,
+:c:type:`komeda_pipeline_state`
+
+.. code-block:: c
+
+    struct komeda_component_state {
+        struct drm_private_state obj;
+        void *binding_user;
+        …
+    }
+
+    struct komeda_pipeline_state {
+        struct drm_private_state obj;
+        struct drm_crtc *crtc;
+        ...
+    }
+
+komeda component validation
+---------------------------
+
+Komeda has multiple types of components, but the process of validation are
+similar, usually include following steps:
+
+.. code-block:: c
+
+    int komeda_xxxx_validate(struct komeda_component_xxx xxx_comp,
+                struct komeda_component_output *input_dflow,
+                struct drm_plane/crtc/connector *user,
+                struct drm_plane/crtc/connector_state, *user_state)
+    {
+         setup 1: check if component is needed, like the scaler is optional depend
+                  on the user_state, if unneeded, just return, the caller will put
+                  the data flow into next stage.
+         Setup 2: check user_state with component features and capabilities to see
+                  if can meet, if not return fail.
+         Setup 3: get component_state from drm_atomic_state, and try set user to
+                  component, fail if component has been assigned to another user already.
+         Setup 3: configure the component_state, like set its input component,
+                  convert user_state to component specific state.
+         Setup 4: adjust the input_dflow and prepare it for the next stage.
+    }
+
+komeda_kms Abstraction
+----------------------
+
+.. kernel-doc:: drivers/gpu/drm/arm/display/komeda/komeda_kms.h
+   :internal:
+
+komde_kms Functions
+-------------------
+.. kernel-doc:: drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
+   :internal:
+.. kernel-doc:: drivers/gpu/drm/arm/display/komeda/komeda_plane.c
+   :internal:
+
+Build komeda to be a linux module driver
+========================================
+
+Now we have two devices:
+
+-   komeda_dev is for describing the real display hardware.
+-   komeda_kms_dev is for attaching or connecting komeda_dev to DRM-KMS.
+
+all komeda operations are supplied or operated by komeda_dev or komeda_kms_dev,
+the module driver is only a simple wrapper to pass the linux command
+(probe/remove/pm) into komeda_dev or komeda_kms_dev.
-- 
2.17.1