linux-stable.git/drivers/gpu/drm/amd/display/dc/dce, branch master Linux kernel stable tree drm/amd/display: add missing CSC entries for BT.2020 for DCE IPs 2026-06-03T18:42:38+00:00 Leorize leorize+oss@disroot.org 2026-05-28T06:58:54+00:00 6590fe323ce2807f5d9454e7fccf3fab875d4352 DCE-based hardware does not have the CSC matrices for BT.2020, which causes the driver to fallback to the GPU built-in matrices. This does not appear to cause any issues for RGB sinks, but causes major color artifacts for YCbCr ones (e.g. black becomes green). This commit adds the missing CSC matrices (taken from DC common) to DCE CSC tables, resolving the issue. Closes: https://gitlab.freedesktop.org/drm/amd/-/work_items/3358 Closes: https://gitlab.freedesktop.org/drm/amd/-/work_items/5333 Assisted-by: oh-my-pi:GPT-5.5 Signed-off-by: Leorize <leorize+oss@disroot.org> Reviewed-by: Alex Hung <alex.hung@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> (cherry picked from commit 51e6668ab4baf55b082c376318d51ef965757196) Cc: stable@vger.kernel.org 
DCE-based hardware does not have the CSC matrices for BT.2020, which
causes the driver to fallback to the GPU built-in matrices. This does
not appear to cause any issues for RGB sinks, but causes major color
artifacts for YCbCr ones (e.g. black becomes green).

This commit adds the missing CSC matrices (taken from DC common) to DCE
CSC tables, resolving the issue.

Closes: https://gitlab.freedesktop.org/drm/amd/-/work_items/3358
Closes: https://gitlab.freedesktop.org/drm/amd/-/work_items/5333
Assisted-by: oh-my-pi:GPT-5.5
Signed-off-by: Leorize <leorize+oss@disroot.org>
Reviewed-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 51e6668ab4baf55b082c376318d51ef965757196)
Cc: stable@vger.kernel.org
drm/amd/display: Allow DCE link encoder without AUX registers 2026-04-29T14:41:22+00:00 Timur Kristóf timur.kristof@gmail.com 2026-04-28T11:40:41+00:00 ac27e3f99035f132f23bc0409d0e57f11f054c70 Allow constructing the DCE link encoder without DDC, which means the AUX registers array will be NULL. This is necessary to support embedded connectors without DDC. Fixes: 4562236b3bc0 ("drm/amd/dc: Add dc display driver (v2)") Link: https://gitlab.freedesktop.org/drm/amd/-/work_items/5192 Signed-off-by: Timur Kristóf <timur.kristof@gmail.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> (cherry picked from commit 87f30b101af62590faf6020d106da07efdda199b) 
Allow constructing the DCE link encoder without DDC,
which means the AUX registers array will be NULL.

This is necessary to support embedded connectors without DDC.

Fixes: 4562236b3bc0 ("drm/amd/dc: Add dc display driver (v2)")
Link: https://gitlab.freedesktop.org/drm/amd/-/work_items/5192
Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 87f30b101af62590faf6020d106da07efdda199b)
drm/amd/display: Remove redundant includes from DC 2026-04-17T19:21:52+00:00 Roman Li Roman.Li@amd.com 2026-04-09T17:37:36+00:00 1fd0c5c91e1c735edd6714e2269a7c734ab895b7 [Why] The explicit include of linux/array_size.h in Display Core (DC) is redundant. The ARRAY_SIZE macro is already provided by dm_services.h (via os_types.h) which DC includes. [How] Remove the unnecessary #include <linux/array_size.h> from dc_hw_sequencer.c and dce_clock_source.c. Fixes: 2d2366176445 ("drm/amd/display: Replace inline NUM_ELEMENTS macro with ARRAY_SIZE") CC: Linus Probert <linus.probert@gmail.com> Signed-off-by: Roman Li <Roman.Li@amd.com> Reviewed-by: Alex Hung <alex.hung@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> 
[Why]
The explicit include of linux/array_size.h in Display Core (DC) is
redundant. The ARRAY_SIZE macro is already provided by dm_services.h
(via os_types.h) which DC includes.

[How]
Remove the unnecessary #include <linux/array_size.h> from
dc_hw_sequencer.c and dce_clock_source.c.

Fixes: 2d2366176445 ("drm/amd/display: Replace inline NUM_ELEMENTS macro with ARRAY_SIZE")
CC: Linus Probert <linus.probert@gmail.com>
Signed-off-by: Roman Li <Roman.Li@amd.com>
Reviewed-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
drm/amd/display: Replace inline NUM_ELEMENTS macro with ARRAY_SIZE 2026-04-03T18:04:43+00:00 Linus Probert linus.probert@gmail.com 2026-04-03T08:22:06+00:00 2d23661764450fc37208c2888c91fa320e830d63 Replaces the use of local NUM_ELEMENTS macro with the ARRAY_SIZE macro defined in <linux/array_size.h>. This aligns with existing coccinelle script array_size.cocci which has been applied to other sources in order to remove inline sizeof(a)/sizeof(a[0]) patterns from other source files. Suggested-by: Robert P. J. Day <rpjday@crashcourse.ca> Signed-off-by: Linus Probert <linus.probert@gmail.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> 
Replaces the use of local NUM_ELEMENTS macro with the ARRAY_SIZE macro
defined in <linux/array_size.h>.

This aligns with existing coccinelle script array_size.cocci which has
been applied to other sources in order to remove inline
sizeof(a)/sizeof(a[0]) patterns from other source files.

Suggested-by: Robert P. J. Day <rpjday@crashcourse.ca>
Signed-off-by: Linus Probert <linus.probert@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
drm/amd/display: Fixed Silence complier warnings in dc 2026-03-30T19:12:15+00:00 Gaghik Khachatrian gaghik.khachatrian@amd.com 2026-03-09T21:18:25+00:00 f82480fafedf622541276d48a3b4fed20ce5d866 [Why] Resolve compiler warnings by marking unused parameters explicitly. [How] In .c and .h function definitions, keep parameter names in signatures and add a line with `(void)param;` in function body Preserved function signatures and avoids breaking code paths that may reference the parameter under conditional compilation. Reviewed-by: Dillon Varone <dillon.varone@amd.com> Reviewed-by: Austin Zheng <austin.zheng@amd.com> Signed-off-by: Gaghik Khachatrian <gaghik.khachatrian@amd.com> Signed-off-by: Chuanyu Tseng <chuanyu.tseng@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> 
[Why]
Resolve compiler warnings by marking unused parameters explicitly.

[How]
In .c and .h function definitions, keep parameter names
in signatures and add a line with `(void)param;` in function body

Preserved function signatures and avoids breaking code paths that
may reference the parameter under conditional compilation.

Reviewed-by: Dillon Varone <dillon.varone@amd.com>
Reviewed-by: Austin Zheng <austin.zheng@amd.com>
Signed-off-by: Gaghik Khachatrian <gaghik.khachatrian@amd.com>
Signed-off-by: Chuanyu Tseng <chuanyu.tseng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
drm/amd/display: Fixed silence signed/unsigned mismatch warnings 2026-03-30T18:55:39+00:00 Clay King clayking@amd.com 2026-03-17T19:17:48+00:00 724cf8ae6353c47ef762efd1342f0eb447e16e61 Fix compiler warnings by consistently use the same signedness for a given value Reviewed-by: Joshua Aberback <joshua.aberback@amd.com> Signed-off-by: Clay King <clayking@amd.com> Signed-off-by: Chuanyu Tseng <chuanyu.tseng@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> 
Fix compiler warnings by consistently use the same signedness for
a given value

Reviewed-by: Joshua Aberback <joshua.aberback@amd.com>
Signed-off-by: Clay King <clayking@amd.com>
Signed-off-by: Chuanyu Tseng <chuanyu.tseng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
drm/amd/display: Fix Silence signed/unsighed mismatch warning in dc 2026-03-30T18:55:17+00:00 Gaghik Khachatrian gaghik.khachatrian@amd.com 2026-03-12T19:42:01+00:00 26ebcac0566b78a9e6bfb71fb6b3436e0fe251a6 [Why] Implicit signed-to-unsigned conversions caused compiler warnings in DC paths. [How] Added explicit (unsigned int)/(uint32_t) casts for sentinel -1 assignments and IRQ ~MASK initializers, with small cast alignment in logging/DPCD code. Functionality and behavior is unchanged; only type intent is explicit. Reviewed-by: Dillon Varone <dillon.varone@amd.com> Signed-off-by: Gaghik Khachatrian <gaghik.khachatrian@amd.com> Signed-off-by: Chuanyu Tseng <chuanyu.tseng@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> 
[Why]
Implicit signed-to-unsigned conversions caused compiler
warnings in DC paths.

[How]
Added explicit (unsigned int)/(uint32_t) casts for sentinel -1
assignments and IRQ ~MASK initializers, with small cast alignment
in logging/DPCD code.

Functionality and behavior is unchanged; only type intent is explicit.

Reviewed-by: Dillon Varone <dillon.varone@amd.com>
Signed-off-by: Gaghik Khachatrian <gaghik.khachatrian@amd.com>
Signed-off-by: Chuanyu Tseng <chuanyu.tseng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
drm/amd/display: add a no_hpd link_encoder_funcs variant 2026-03-24T17:35:28+00:00 Alex Deucher alexander.deucher@amd.com 2026-03-20T16:56:20+00:00 68178644c35fca972ed970dc84933281b4913bff For link encoders without HPD (analog or LVDS), add a link_encoder_funcs structure with no hpd enable callbacks. The enable and disable hpd callbacks are currently not used outside of a special case in debugfs which checks if the hpd is valid before using it, but this will protect us if they ever are. Reviewed-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> 
For link encoders without HPD (analog or LVDS), add a
link_encoder_funcs structure with no hpd enable callbacks.

The enable and disable hpd callbacks are currently not used
outside of a special case in debugfs which checks if the hpd
is valid before using it, but this will protect us if they
ever are.

Reviewed-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
drm/amd/display: Sync dcn42 with DC 3.2.373 2026-03-11T17:58:07+00:00 Roman Li Roman.Li@amd.com 2026-03-05T17:56:09+00:00 e56e3cff2a1bb29545ddbec562e76c0419363a40 This patch provides a bulk merge to align driver support for DCN42 with Display Core version 3.2.373. It includes upgrade for: - clk_mgr - dml2/dml21 - optc - hubp - mpc - optc - hwseq Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com> Signed-off-by: Roman Li <Roman.Li@amd.com> Signed-off-by: Alex Hung <alex.hung@amd.com> Tested-by: Dan Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> 
This patch provides a bulk merge to align driver
support for DCN42 with Display Core version 3.2.373.

It includes upgrade for:
- clk_mgr
- dml2/dml21
- optc
- hubp
- mpc
- optc
- hwseq

Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Roman Li <Roman.Li@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
drm/amd/display: Add documentation and cleanup DMUB HW lock manager 2026-03-11T15:02:03+00:00 Nicholas Kazlauskas nicholas.kazlauskas@amd.com 2026-02-24T15:36:29+00:00 b8469dd5b37fd25886c2018a04b71eb76fe8975d To document how the helpers should be used before a subsequent change adds new locations that these helpers will be used. Reviewed-by: Ovidiu (Ovi) Bunea <ovidiu.bunea@amd.com> Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> Signed-off-by: Alex Hung <alex.hung@amd.com> Tested-by: Dan Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> 
To document how the helpers should be used before a subsequent change
adds new locations that these helpers will be used.

Reviewed-by: Ovidiu (Ovi) Bunea <ovidiu.bunea@amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>