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drm/amd/display: don't enable DRM CRTC degamma property for DCE

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DM maps DRM CRTC degamma to DPP (pre-blending) degamma block, but DCE doesn't
support programmable degamma curve anywhere. Currently, a custom degamma is
accepted by DM but just ignored by DCE driver and degamma correction isn't
actually applied. There is no way to map custom degamma in DCE, therefore, DRM
CRTC degamma property shouldn't be enabled for DCE drivers.

Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Melissa Wen <mwen@igalia.com>
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Melissa Wen 2022-11-03 17:45:00 -01:00 committed by Alex Deucher
parent 9a31c06ff7
commit c17b7a58e5
1 changed files with 8 additions and 2 deletions
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10
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c
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@ -415,7 +415,7 @@ int amdgpu_dm_crtc_init(struct amdgpu_display_manager *dm,
{
struct amdgpu_crtc *acrtc = NULL;
struct drm_plane *cursor_plane;
bool is_dcn;
int res = -ENOMEM;
cursor_plane = kzalloc(sizeof(*cursor_plane), GFP_KERNEL);
@ -453,8 +453,14 @@ int amdgpu_dm_crtc_init(struct amdgpu_display_manager *dm,
acrtc->otg_inst = -1;
dm->adev->mode_info.crtcs[crtc_index] = acrtc;
drm_crtc_enable_color_mgmt(&acrtc->base, MAX_COLOR_LUT_ENTRIES,
/* Don't enable DRM CRTC degamma property for DCE since it doesn't
* support programmable degamma anywhere.
*/
is_dcn = dm->adev->dm.dc->caps.color.dpp.dcn_arch;
drm_crtc_enable_color_mgmt(&acrtc->base, is_dcn ? MAX_COLOR_LUT_ENTRIES : 0,
true, MAX_COLOR_LUT_ENTRIES);
drm_mode_crtc_set_gamma_size(&acrtc->base, MAX_COLOR_LEGACY_LUT_ENTRIES);
return 0;