When we merged the drm_plane color pipeline API the major gap that existed was the lack of a YUV to RGB conversion colorop. We deprecated any legacy drm_plane color properties, which means that the COLOR_RANGE and COLOR_ENCODING properties can't be used with the COLOR_PIPELINE property on a drm_plane. In practice this means that we can't use a COLOR_PIPELINE on YCbCr encoded framebuffers.
This patchset expands on the Fixed Matrix colorop proposed by Chaitanya and adds limited range variants of the YCbCr to RGB conversions. His full patchset can be found at https://patchwork.freedesktop.org/patch/709860 This code has been tested with IGT and an experimental KWin branch. IGT branch: https://gitlab.freedesktop.org/hwentland/igt-gpu-tools/-/tree/yuv-fm-colorop KWin branch used for testing: https://invent.kde.org/hwentlan/kwin/-/tree/yuv-fm-colorop The kernel branch containing these changes, based on drm-misc-next can be found at: https://gitlab.freedesktop.org/hwentland/linux/-/tree/yuv-fm-colorop Further background on this work can be found at: https://hwentland.github.io/2026/03/10/plane-color-pipeline-csc-3d-lut-kwin.html v3: - base on Chaitanya's updated patch and rename code accordingly to Fixed_Matrix instead of CSC Fixed-Function v2: - use Chaitanya's CSC_FF block for named matrices Cc: Alex Hung <[email protected]> Cc: Daniel Stone <[email protected]> Cc: Chaitanya Kumar Borah <[email protected]> Cc: Uma Shankar <[email protected]> Cc: Louis Chauvet <[email protected]> Cc: Melissa Wen <[email protected]> Cc: Simon Ser <[email protected]> Cc: Robert Mader <[email protected]> Chaitanya Kumar Borah (1): drm/colorop: Add DRM_COLOROP_FIXED_MATRIX Harry Wentland (10): drm/colorop: Add limited-range YUV-to-RGB fixed matrix enum values drm/vkms: Add fixed matrix colorop to color pipeline drm/vkms: Add atomic check and matrix handling for fixed matrix colorop drm/amd/display: Add fixed matrix colorop to color pipeline drm/amd/display: Implement fixed matrix colorop color space mapping drm/amd/display: Use GAMCOR for first TF if YUV conversion is needed drm/amd/display: Check actual state during commit_tail drm/amd/display: Set color_space to plane_infos drm/amd/display: Set COLOR_SPACE_SRGB when fixed matrix colorop is bypassed drm/amd/display: Force GAMCOR for subsampled surfaces with PQ/Gamma22/HLG .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 14 ++- .../amd/display/amdgpu_dm/amdgpu_dm_color.c | 91 +++++++++++++- .../amd/display/amdgpu_dm/amdgpu_dm_colorop.c | 27 ++++- .../amd/display/amdgpu_dm/amdgpu_dm_colorop.h | 1 + .../amd/display/modules/color/color_gamma.c | 3 +- drivers/gpu/drm/drm_atomic.c | 4 + drivers/gpu/drm/drm_atomic_uapi.c | 4 + drivers/gpu/drm/drm_colorop.c | 109 +++++++++++++++++ drivers/gpu/drm/vkms/vkms_colorop.c | 66 +++++++--- drivers/gpu/drm/vkms/vkms_composer.c | 6 + drivers/gpu/drm/vkms/vkms_plane.c | 68 ++++++++++- include/drm/drm_colorop.h | 114 ++++++++++++++++++ include/uapi/drm/drm_mode.h | 12 ++ 13 files changed, 487 insertions(+), 32 deletions(-) -- 2.54.0
