diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.19.8/0791-drm-amdgpu-Add-amdgpu-max-bpc-connector-property-v2.patch')
| -rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.19.8/0791-drm-amdgpu-Add-amdgpu-max-bpc-connector-property-v2.patch | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.19.8/0791-drm-amdgpu-Add-amdgpu-max-bpc-connector-property-v2.patch b/common/recipes-kernel/linux/linux-yocto-4.19.8/0791-drm-amdgpu-Add-amdgpu-max-bpc-connector-property-v2.patch new file mode 100644 index 00000000..169f87f9 --- /dev/null +++ b/common/recipes-kernel/linux/linux-yocto-4.19.8/0791-drm-amdgpu-Add-amdgpu-max-bpc-connector-property-v2.patch @@ -0,0 +1,71 @@ +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 + |