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Diffstat (limited to 'Documentation/gpu/amdgpu/display/display-manager.rst')
| -rw-r--r-- | Documentation/gpu/amdgpu/display/display-manager.rst | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/Documentation/gpu/amdgpu/display/display-manager.rst b/Documentation/gpu/amdgpu/display/display-manager.rst index b1b0f11aed83..88e2c08c7014 100644 --- a/Documentation/gpu/amdgpu/display/display-manager.rst +++ b/Documentation/gpu/amdgpu/display/display-manager.rst @@ -49,3 +49,37 @@ Color Management Properties .. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c :internal: + + +DC Color Capabilities between DCN generations +--------------------------------------------- + +DRM/KMS framework defines three CRTC color correction properties: degamma, +color transformation matrix (CTM) and gamma, and two properties for degamma and +gamma LUT sizes. AMD DC programs some of the color correction features +pre-blending but DRM/KMS has not per-plane color correction properties. + +In general, the DRM CRTC color properties are programmed to DC, as follows: +CRTC gamma after blending, and CRTC degamma pre-blending. Although CTM is +programmed after blending, it is mapped to DPP hw blocks (pre-blending). Other +color caps available in the hw is not currently exposed by DRM interface and +are bypassed. + +.. kernel-doc:: drivers/gpu/drm/amd/display/dc/dc.h + :doc: color-management-caps + +.. kernel-doc:: drivers/gpu/drm/amd/display/dc/dc.h + :internal: + +The color pipeline has undergone major changes between DCN hardware +generations. What's possible to do before and after blending depends on +hardware capabilities, as illustrated below by the DCN 2.0 and DCN 3.0 families +schemas. + +**DCN 2.0 family color caps and mapping** + +.. kernel-figure:: dcn2_cm_drm_current.svg + +**DCN 3.0 family color caps and mapping** + +.. kernel-figure:: dcn3_cm_drm_current.svg |