kernel/linux.git/drivers/gpu/drm/amd/display/dc/sspl, branch linux-7.0.y

drm/amd/display: Add static keyword for sharpness tables

2026-02-18T15:42:30+00:00

[Why & How] Sharpness tables are only accessed in dc_spl_isharp_filters source file. Reviewed-by: Joshua Aberback Reviewed-by: Jun Lei Signed-off-by: Samson Tam Signed-off-by: Tom Chung Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher

drm/amd/display: Fix P010, NV12, YUY2 scale down by four times failure

2026-01-05T21:59:58+00:00

[WHY] When performing 4:1 downscaling with subsampled formats, the SPL remainder distribution logic (+1) overrides the upper layer’s aligned width, resulting in odd segment widths and causing hang. The upper layer alignment ensures the width is sufficient and even, so SPL should not modify it further. [HOW] In dc_spl.c within calculate_mpc_slice_in_timing_active, add an extra condition: Skip the remainder distribution (+1) when use_recout_width_aligned is true.This change respects the upper layer’s alignment decision, prevents odd widths, and is a minimal, safe fix. Reviewed-by: Joshua Aberback Signed-off-by: Kaier Hsueh Signed-off-by: Chenyu Chen Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher

drm/amd/display: Add configurable SPL namespace prefix

2025-12-08T18:56:41+00:00

[WHY] SPL is a shared library that is used both in kernel and userspace. When multiple libraries use SPL as statically linked, namespace collision occur. [HOW] Create a configurable namespace prefix. Add the prefix to all the public functions of the library to distinguish between the SPL functions in each library. Reviewed-by: Samson Tam Signed-off-by: Navid Assadian Tested-by: Dan Wheeler Signed-off-by: Alex Deucher

drm/amd/display: Add debug option to override EASF scaler taps

2025-10-20T22:19:27+00:00

[Why & How] Add new option override_easf to use in_taps instead of internal taps policy for debugging Reviewed-by: Alvin Lee Signed-off-by: Samson Tam Signed-off-by: Aurabindo Pillai Signed-off-by: Alex Deucher

drm/amd/display: Incorrect Mirror Cositing

2025-10-07T18:09:20+00:00

[WHY] hinit/vinit are incorrect in the case of mirroring. [HOW] Cositing sign must be flipped when image is mirrored in the vertical or horizontal direction. Cc: Mario Limonciello Cc: Alex Deucher Cc: stable@vger.kernel.org Reviewed-by: Samson Tam Signed-off-by: Jesse Agate Signed-off-by: Brendan Leder Signed-off-by: Alex Hung Signed-off-by: Alex Deucher

drm/amd/display: Add custom segmentation support

2025-06-18T16:19:16+00:00

[WHY] Add support for uneven segmentation size [HOW] Currently width + x_start is automatically calculated using slice index + dividing stream into equally sized segments. Add override variables for dst_rect width and x Reviewed-by: Samson Tam Signed-off-by: Brendan Steve Leder Signed-off-by: Alex Hung Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher

drm/amd/display: Do not bypass chroma scaling in 1:1 case

2025-06-03T19:35:53+00:00

[Why] When doing 2:1 downscaling on a YUV sub-sampled format, the chroma scaling ratio is 1:1. Since chroma has cositing, it is needed to do scaling on the chroma plane(s) and not to bypass chroma scaling. [How] Do not set the chroma taps to one when the chroma ratio is identity and the input format is a sub-sampled YUV format. Reviewed-by: Samson Tam Signed-off-by: Navid Assadian Signed-off-by: Wayne Lin Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher

drm/amd/display: add support for 2nd sharpening range

2025-05-16T17:38:51+00:00

[Why & How] Add support for 2nd sharpening range for cases where we want override existing DCN sharpening range. Reviewed-by: Alvin Lee Signed-off-by: Samson Tam Signed-off-by: Tom Chung Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher

drm/amd/display: disable EASF narrow filter sharpening

2025-05-13T13:31:08+00:00

[Why & How] Default should be 1 to disable EASF narrow filter sharpening. Reviewed-by: Alvin Lee Signed-off-by: Samson Tam Signed-off-by: Ray Wu Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher

drm/amd/display: Don't check for NULL divisor in fixpt code

2025-05-07T21:40:15+00:00

[Why] We check for a NULL divisor but don't act on it. This check does nothing other than throw a warning. It does confuse static checkers though: See https://lkml.org/lkml/2025/4/26/371 [How] Drop the ASSERTs in both DC and SPL variants. Fixes: 4562236b3bc0 ("drm/amd/dc: Add dc display driver (v2)") Fixes: 6efc0ab3b05d ("drm/amd/display: add back quality EASF and ISHARP and dc dependency changes") Signed-off-by: Harry Wentland Cc: Linus Torvalds Cc: Leo Li Cc: Alex Deucher Acked-by: Alex Deucher Reviewed-by: Alex Hung Signed-off-by: Alex Deucher