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[PATCH 4.15 034/146] drm/amdgpu: Notify sbios device ready before send request




4.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Rex Zhu <Rex.Zhu@xxxxxxx>

commit 1bced75f4ab04bec55aecb57d99435dc6d0ae5a0 upstream.

it is required if a platform supports PCIe root complex
core voltage reduction. After receiving this notification,
SBIOS can apply default PCIe root complex power policy.

Reviewed-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Rex Zhu <Rex.Zhu@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
@@ -540,6 +540,9 @@ int amdgpu_acpi_pcie_performance_request
 	size_t size;
 	u32 retry = 3;
 
+	if (amdgpu_acpi_pcie_notify_device_ready(adev))
+		return -EINVAL;
+
 	/* Get the device handle */
 	handle = ACPI_HANDLE(&adev->pdev->dev);
 	if (!handle)