linux.git/drivers/gpu/drm/amd/display/dc/sspl, branch master Linux kernel source tree drm/amd/display: Add SPL UPSP upsampling and YUV422 scaling support 2026-07-28T22:44:42+00:00 Wayne Lin Wayne.Lin@amd.com 2026-07-15T07:20:07+00:00 8cba48e7a813eacf241470ead5301bfcb680513a - Add YUV422/YUV444 pixel format definitions - Handle YUV422 chroma scaling ratios - Use separate horizontal and vertical viewport divisors - Add UPSP upsampling register programming - Refine tap selection for horizontally and vertically subsampled formats Reviewed-by: Tom Chung <chiahsuan.chung@amd.com> Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com> Signed-off-by: Wayne Lin <Wayne.Lin@amd.com> Tested-by: Dan Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> 
- Add YUV422/YUV444 pixel format definitions
- Handle YUV422 chroma scaling ratios
- Use separate horizontal and vertical viewport divisors
- Add UPSP upsampling register programming
- Refine tap selection for horizontally and vertically subsampled formats

Reviewed-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Wayne Lin <Wayne.Lin@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
drm/amd/display: remove check for nonexistent CONFIG_HAVE_KGDB 2026-07-01T15:18:35+00:00 Ethan Nelson-Moore enelsonmoore@gmail.com 2026-06-11T01:30:11+00:00 c69657158582a14e057a9e582e48bbc012884d69 drivers/gpu/drm/amd/display/dc/sspl/spl_debug.h checks for CONFIG_HAVE_KGDB or CONFIG_KGDB to determine whether to call kgdb_breakpoint(). CONFIG_HAVE_KGDB has never existed in the kernel. Remove the check for it and retain only the correct check for CONFIG_KGDB. Discovered while searching for CONFIG_* symbols referenced in code but not defined in any Kconfig file. Signed-off-by: Ethan Nelson-Moore <enelsonmoore@gmail.com> Tested-by: Dan Wheeler <daniel.wheeler@amd.com> Acked-by: George Zhang <george.zhang@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> 
drivers/gpu/drm/amd/display/dc/sspl/spl_debug.h checks for
CONFIG_HAVE_KGDB or CONFIG_KGDB to determine whether to call
kgdb_breakpoint(). CONFIG_HAVE_KGDB has never existed in the kernel.
Remove the check for it and retain only the correct check for
CONFIG_KGDB.

Discovered while searching for CONFIG_* symbols referenced in code but
not defined in any Kconfig file.

Signed-off-by: Ethan Nelson-Moore <enelsonmoore@gmail.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Acked-by: George Zhang <george.zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
drm/amd/display: Add static keyword for sharpness tables 2026-02-18T15:42:30+00:00 Samson Tam samson.tam@amd.com 2025-12-15T22:14:21+00:00 4a063f64f905310ae7ec81f2e1cc9fdefb7ac3d7 [Why & How] Sharpness tables are only accessed in dc_spl_isharp_filters source file. Reviewed-by: Joshua Aberback <joshua.aberback@amd.com> Reviewed-by: Jun Lei <jun.lei@amd.com> Signed-off-by: Samson Tam <samson.tam@amd.com> Signed-off-by: Tom Chung <chiahsuan.chung@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> 
[Why & How]
Sharpness tables are only accessed in dc_spl_isharp_filters source file.

Reviewed-by: Joshua Aberback <joshua.aberback@amd.com>
Reviewed-by: Jun Lei <jun.lei@amd.com>
Signed-off-by: Samson Tam <samson.tam@amd.com>
Signed-off-by: Tom Chung <chiahsuan.chung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
drm/amd/display: Fix P010, NV12, YUY2 scale down by four times failure 2026-01-05T21:59:58+00:00 Kaier Hsueg Kaier.Hsueh@amd.com 2025-12-04T16:33:59+00:00 fd3fece04db80c8877361bf4c9f59521ce457be0 [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 <joshua.aberback@amd.com> Signed-off-by: Kaier Hsueh <Kaier.Hsueh@amd.com> Signed-off-by: Chenyu Chen <chen-yu.chen@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> 
[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 <joshua.aberback@amd.com>
Signed-off-by: Kaier Hsueh <Kaier.Hsueh@amd.com>
Signed-off-by: Chenyu Chen <chen-yu.chen@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
drm/amd/display: Add configurable SPL namespace prefix 2025-12-08T18:56:41+00:00 Navid Assadian Navid.Assadian@amd.com 2025-11-12T19:35:12+00:00 25888a46630875ea47024ee8d24614bf30f603a0 [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 <samson.tam@amd.com> Signed-off-by: Navid Assadian <Navid.Assadian@amd.com> Tested-by: Dan Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> 
[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 <samson.tam@amd.com>
Signed-off-by: Navid Assadian <Navid.Assadian@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
drm/amd/display: Add debug option to override EASF scaler taps 2025-10-20T22:19:27+00:00 Samson Tam Samson.Tam@amd.com 2025-09-25T19:01:23+00:00 f9491b67630ea7eeb9d19091ba9c0f3f6af82a81 [Why & How] Add new option override_easf to use in_taps instead of internal taps policy for debugging Reviewed-by: Alvin Lee <alvin.lee2@amd.com> Signed-off-by: Samson Tam <Samson.Tam@amd.com> Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> 
[Why & How]
Add new option override_easf to use in_taps instead of internal
 taps policy for debugging

Reviewed-by: Alvin Lee <alvin.lee2@amd.com>
Signed-off-by: Samson Tam <Samson.Tam@amd.com>
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
drm/amd/display: Incorrect Mirror Cositing 2025-10-07T18:09:20+00:00 Jesse Agate jesse.agate@amd.com 2025-06-13T18:20:53+00:00 d07e142641417e67f3bfc9d8ba3da8a69c39cfcd [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 <mario.limonciello@amd.com> Cc: Alex Deucher <alexander.deucher@amd.com> Cc: stable@vger.kernel.org Reviewed-by: Samson Tam <samson.tam@amd.com> Signed-off-by: Jesse Agate <jesse.agate@amd.com> Signed-off-by: Brendan Leder <breleder@amd.com> Signed-off-by: Alex Hung <alex.hung@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> 
[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 <mario.limonciello@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Reviewed-by: Samson Tam <samson.tam@amd.com>
Signed-off-by: Jesse Agate <jesse.agate@amd.com>
Signed-off-by: Brendan Leder <breleder@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
drm/amd/display: Add custom segmentation support 2025-06-18T16:19:16+00:00 Brendan Steve Leder BrendanSteve.Leder@amd.com 2025-03-14T18:32:31+00:00 428ac7ce7f82d11f072cba6000987826746a017b [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 <samson.tam@amd.com> Signed-off-by: Brendan Steve Leder <BrendanSteve.Leder@amd.com> Signed-off-by: Alex Hung <alex.hung@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> 
[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 <samson.tam@amd.com>
Signed-off-by: Brendan Steve Leder <BrendanSteve.Leder@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
drm/amd/display: Do not bypass chroma scaling in 1:1 case 2025-06-03T19:35:53+00:00 Navid Assadian Navid.Assadian@amd.com 2025-04-30T19:38:20+00:00 a4d04bc90d2d539cf27f72128a0301a261e1249d [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 <samson.tam@amd.com> Signed-off-by: Navid Assadian <Navid.Assadian@amd.com> Signed-off-by: Wayne Lin <wayne.lin@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> 
[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 <samson.tam@amd.com>
Signed-off-by: Navid Assadian <Navid.Assadian@amd.com>
Signed-off-by: Wayne Lin <wayne.lin@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
drm/amd/display: add support for 2nd sharpening range 2025-05-16T17:38:51+00:00 Samson Tam Samson.Tam@amd.com 2025-05-09T15:18:50+00:00 4a16285aa1d468f566cac0613350b5f77b15f4a7 [Why & How] Add support for 2nd sharpening range for cases where we want override existing DCN sharpening range. Reviewed-by: Alvin Lee <alvin.lee2@amd.com> Signed-off-by: Samson Tam <Samson.Tam@amd.com> Signed-off-by: Tom Chung <chiahsuan.chung@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> 
[Why & How]
Add support for 2nd sharpening range for cases where we want
override existing DCN sharpening range.

Reviewed-by: Alvin Lee <alvin.lee2@amd.com>
Signed-off-by: Samson Tam <Samson.Tam@amd.com>
Signed-off-by: Tom Chung <chiahsuan.chung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>