kernel/drivers/gpu/drm/amd/display/dc/dcn30, branch linux-rolling-stable

drm/amd/display: extend delta clamping logic to CM3 LUT helper

2026-02-19T15:31:33Z

[ Upstream commit d25b32aa829a3ed5570138e541a71fb7805faec3 ] Commit 27fc10d1095f ("drm/amd/display: Fix the delta clamping for shaper LUT") fixed banding when using plane shaper LUT in DCN10 CM helper. The problem is also present in DCN30 CM helper, fix banding by extending the same bug delta clamping fix to CM3. Signed-off-by: Melissa Wen Reviewed-by: Harry Wentland Signed-off-by: Alex Deucher (cherry picked from commit 0274a54897f356f9c78767c4a2a5863f7dde90c6) Signed-off-by: Sasha Levin

drm/amd/display: fix wrong color value mapping on MCM shaper LUT

2026-02-11T12:41:58Z

[ Upstream commit 8f959d37c1f2efec6dac55915ee82302e98101fb ] Some shimmer/colorful points appears when using the steamOS color pipeline for HDR on gaming with DCN32. These points look like black values being wrongly mapped to red/blue/green values. It was caused because the number of hw points in regular LUTs and in a shaper LUT was treated as the same. DCN3+ regular LUTs have 257 bases and implicit deltas (i.e. HW calculates them), but shaper LUT is a special case: it has 256 bases and 256 deltas, as in DCN1-2 regular LUTs, and outputs 14-bit values. Fix that by setting by decreasing in 1 the number of HW points computed in the LUT segmentation so that shaper LUT (i.e. fixpoint == true) keeps the same DCN10 CM logic and regular LUTs go with `hw_points + 1`. CC: Krunoslav Kovac Fixes: 4d5fd3d08ea9 ("drm/amd/display: PQ tail accuracy") Signed-off-by: Melissa Wen Reviewed-by: Alex Hung Signed-off-by: Alex Deucher (cherry picked from commit 5006505b19a2119e71c008044d59f6d753c858b9) Signed-off-by: Sasha Levin

drm/amd/display: Remove unused cm3_helper_translate_curve_to_degamma_hw_format

2024-11-04T16:26:20Z

cm3_helper_translate_curve_to_degamma_hw_format() since it was added in 2020's commit 03f54d7d3448 ("drm/amd/display: Add DCN3 DPP") Remove it. Signed-off-by: Dr. David Alan Gilbert Signed-off-by: Alex Deucher

drm/amd/display: Fix low black values by increasing error

2024-10-07T18:12:01Z

[WHY] Regamma resolution for the first few black levels can have problems for calibration. [HOW] HW LUT is divided into N power-of-2 regions each with K segments. For SDR mode we set min point at 2^-10 and increments of 2^-13. It's generally more than 8-bit SDR needs, but some calibration tools and API use 12-bit curves. The fix shifts starting point to 2^-12 and starting increments at 2^-16. Reviewed-by: Krunoslav Kovac Signed-off-by: Peterson Signed-off-by: Rodrigo Siqueira Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher

drm/amd/display: Fix index out of bounds in DCN30 color transformation

2024-07-23T21:41:39Z

This commit addresses a potential index out of bounds issue in the `cm3_helper_translate_curve_to_hw_format` function in the DCN30 color management module. The issue could occur when the index 'i' exceeds the number of transfer function points (TRANSFER_FUNC_POINTS). The fix adds a check to ensure 'i' is within bounds before accessing the transfer function points. If 'i' is out of bounds, the function returns false to indicate an error. drivers/gpu/drm/amd/amdgpu/../display/dc/dcn30/dcn30_cm_common.c:180 cm3_helper_translate_curve_to_hw_format() error: buffer overflow 'output_tf->tf_pts.red' 1025 <= s32max drivers/gpu/drm/amd/amdgpu/../display/dc/dcn30/dcn30_cm_common.c:181 cm3_helper_translate_curve_to_hw_format() error: buffer overflow 'output_tf->tf_pts.green' 1025 <= s32max drivers/gpu/drm/amd/amdgpu/../display/dc/dcn30/dcn30_cm_common.c:182 cm3_helper_translate_curve_to_hw_format() error: buffer overflow 'output_tf->tf_pts.blue' 1025 <= s32max Cc: Tom Chung Cc: Rodrigo Siqueira Cc: Roman Li Cc: Alex Hung Cc: Aurabindo Pillai Cc: Harry Wentland Cc: Hamza Mahfooz Signed-off-by: Srinivasan Shanmugam Reviewed-by: Tom Chung Signed-off-by: Alex Deucher

drm/amd/display: Fix index out of bounds in DCN30 degamma hardware format translation

2024-07-23T21:41:12Z

This commit addresses a potential index out of bounds issue in the `cm3_helper_translate_curve_to_degamma_hw_format` function in the DCN30 color management module. The issue could occur when the index 'i' exceeds the number of transfer function points (TRANSFER_FUNC_POINTS). The fix adds a check to ensure 'i' is within bounds before accessing the transfer function points. If 'i' is out of bounds, the function returns false to indicate an error. Reported by smatch: drivers/gpu/drm/amd/amdgpu/../display/dc/dcn30/dcn30_cm_common.c:338 cm3_helper_translate_curve_to_degamma_hw_format() error: buffer overflow 'output_tf->tf_pts.red' 1025 <= s32max drivers/gpu/drm/amd/amdgpu/../display/dc/dcn30/dcn30_cm_common.c:339 cm3_helper_translate_curve_to_degamma_hw_format() error: buffer overflow 'output_tf->tf_pts.green' 1025 <= s32max drivers/gpu/drm/amd/amdgpu/../display/dc/dcn30/dcn30_cm_common.c:340 cm3_helper_translate_curve_to_degamma_hw_format() error: buffer overflow 'output_tf->tf_pts.blue' 1025 <= s32max Cc: Tom Chung Cc: Rodrigo Siqueira Cc: Roman Li Cc: Alex Hung Cc: Aurabindo Pillai Cc: Harry Wentland Cc: Hamza Mahfooz Signed-off-by: Srinivasan Shanmugam Reviewed-by: Tom Chung Signed-off-by: Alex Deucher

drm/amd/display: Refactoring HPO

2024-07-23T21:35:45Z

[Why] To refactor HPO files [How] Moved hpo related files to specific hpo folder and update Makefiles. Reviewed-by: Martin Leung Signed-off-by: Revalla Hari Krishna Signed-off-by: Aurabindo Pillai Signed-off-by: Alex Deucher

drm/amd/display: Refactoring DWB related files from dcn30 Files

2024-07-23T21:07:12Z

[Why] To refactor DWB related files from dcn30 Files [How] Moved DWB related files from dcn30 to specific DWB folder and updated Makefiles to fix Compilation. Reviewed-by: Martin Leung Signed-off-by: Jerry Zuo Signed-off-by: Mudimela Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher

drm/amd/display: Refactoring MPC

2024-07-23T21:07:11Z

[Why] To refactor MPC files [How] Moved MPC files to respective folders and updated makefiles appropriately. Reviewed-by: Martin Leung Signed-off-by: Jerry Zuo Signed-off-by: Mounika Adhuri Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher

drm/amd/display: Move dio files into dio folder

2024-07-01T20:10:35Z

[why] Refactor the code of dio to unit test. [how] Moved files to respective folders and changed cMakeLists and makefiles. Acked-by: Rodrigo Siqueira Signed-off-by: Jerry Zuo Signed-off-by: Bhuvanachandra Pinninti Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher