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From 9ebe967e3a73bf30ad0ac33363bdbc679ad96ffd Mon Sep 17 00:00:00 2001
From: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Date: Thu, 15 Nov 2018 17:19:12 -0500
Subject: [PATCH 0791/2940] drm/amdgpu: Add amdgpu "max bpc" connector property
(v2)
[Why]
Many panels support more than 8bpc but some modes are unavailable while
running at greater than 8bpc due to DP/HDMI bandwidth constraints.
Support for more than 8bpc was added recently in the driver but it
defaults to the maximum supported bpc - locking out these modes.
This should be a user configurable option such that the user can select
what bpc configuration they would like.
[How]
This patch introduces the "max bpc" amdgpu driver specific connector
property so the user can limit the maximum bpc. It ranges from 8 to 16.
This doesn't directly set the preferred bpc for the panel since it
follows Intel's existing driver conventions.
This proprety should be removed once common drm support for max bpc
lands.
v2: rebase on upstream (Alex)
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_display.c | 7 +++++++
drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h | 2 ++
2 files changed, 9 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
index 7d6a36bca9dd..cadca8bd4f0e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
@@ -639,6 +639,13 @@ int amdgpu_display_modeset_create_props(struct amdgpu_device *adev)
return -ENOMEM;
}
+ if (amdgpu_device_has_dc_support(adev)) {
+ adev->mode_info.max_bpc_property =
+ drm_property_create_range(adev->ddev, 0, "max bpc", 8, 16);
+ if (!adev->mode_info.max_bpc_property)
+ return -ENOMEM;
+ }
+
return 0;
}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h
index 1627dd3413c7..2cb1f41ea104 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h
@@ -338,6 +338,8 @@ struct amdgpu_mode_info {
struct drm_property *audio_property;
/* FMT dithering */
struct drm_property *dither_property;
+ /* maximum number of bits per channel for monitor color */
+ struct drm_property *max_bpc_property;
/* it is used to allow enablement of freesync mode */
struct drm_property *freesync_property;
/* it is used to know about display capability of freesync mode */
--
2.17.1
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