linux-stable.git/drivers/gpu/drm/amd/display, branch v6.18.50 Linux kernel stable tree drm/amd/display: Prune per-tile Timing from Apple Studio Display Primary Tile 2026-09-07T15:22:20+00:00 Fangzhi Zuo jerry.zuo@amd.com 2026-09-01T15:22:19+00:00 4628e40c9ca79c7ca6d55ee0d5da1839c2d0b4c7 [ Upstream commit 7a4dd08c3f921576c6a7524f60e4f0e4601835d2 ] [why] The Apple Studio Display primary tile advertises both the full 5120x2880 mode and the per-tile 2560x2880 timing. With the secondary tile already hidden from userspace, the stray 2560x2880 mode on the primary connector can still be picked by compositors, defeating the single 5K stream goal. [how] Prune the per-tile timing from the primary connector during get_modes: when the sink carries the disable_second_tile quirk and the connector is the primary tile (tile_h_loc == 0 && tile_v_loc == 0), drop any probed mode matching the advertised tile size (tile_h_size x tile_v_size) so userspace only sees the full 5120x2880 mode. Fixes: 49521be4809d ("drm/amd/display: hide Apple Studio Display secondary tile") Reviewed-by: Wayne Lin <wayne.lin@amd.com> Signed-off-by: Fangzhi Zuo <jerry.zuo@amd.com> Tested-by: Dan Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Adjust for lack of movement from amdgpu_dm.c to amdgpu_dm_connector.c Signed-off-by: Mario Limonciello <mario.limonciello@amd.com> Signed-off-by: Sasha Levin <sashal@kernel.org> 
[ Upstream commit 7a4dd08c3f921576c6a7524f60e4f0e4601835d2 ]

[why]
The Apple Studio Display primary tile advertises both the full 5120x2880
mode and the per-tile 2560x2880 timing. With the secondary tile already
hidden from userspace, the stray 2560x2880 mode on the primary connector
can still be picked by compositors, defeating the single 5K stream goal.

[how]
Prune the per-tile timing from the primary connector during get_modes:
when the sink carries the disable_second_tile quirk and the connector is
the primary tile (tile_h_loc == 0 && tile_v_loc == 0), drop any probed
mode matching the advertised tile size (tile_h_size x tile_v_size) so
userspace only sees the full 5120x2880 mode.

Fixes: 49521be4809d ("drm/amd/display: hide Apple Studio Display secondary tile")
Reviewed-by: Wayne Lin <wayne.lin@amd.com>
Signed-off-by: Fangzhi Zuo <jerry.zuo@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Adjust for lack of movement from amdgpu_dm.c to amdgpu_dm_connector.c
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
drm/amd/display: hide Apple Studio Display secondary tile 2026-09-07T15:22:20+00:00 Jerry Zuo jerry.zuo@amd.com 2026-09-01T15:22:18+00:00 7d860bed133698eefa7f5f808c7dbce1c2738b96 [ Upstream commit 49521be4809d63fe3efb6bc68ee11cb1e1ef3d63 ] The Apple Studio Display exposes a 2x1 tiled panel over two SST DP links. The primary tile advertises the full 5120x2880 mode (with DSC on the bandwidth-sufficient link) while the secondary carries a per-tile 2560x2880 timing on a link without sufficient bandwidth. Report the non-primary tile connector as disconnected during detect so compositors only see the primary DP link and configure a single 5K mode instead of driving both tiled streams independently. Drive the behaviour from an EDID quirk: add a disable_second_tile panel patch that apply_edid_quirks() sets for the affected Apple Studio Display panel IDs (0xAE3A, 0xAE42, 0xAE46), and have detect() hide the secondary tile when the sink carries that quirk. Reviewed-by: Mario Limonciello <mario.limonciello@amd.com> Reviewed-by: Sun peng Li <sunpeng.li@amd.com> Signed-off-by: Jerry Zuo <jerry.zuo@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> Adjust for lack of movement from amdgpu_dm.c to amdgpu_dm_connector.c Adjust for lack of analog connector support. Signed-off-by: Mario Limonciello <mario.limonciello@amd.com> Signed-off-by: Sasha Levin <sashal@kernel.org> 
[ Upstream commit 49521be4809d63fe3efb6bc68ee11cb1e1ef3d63 ]

The Apple Studio Display exposes a 2x1 tiled panel over two SST DP
links. The primary tile advertises the full 5120x2880 mode (with DSC on
the bandwidth-sufficient link) while the secondary carries a per-tile
2560x2880 timing on a link without sufficient bandwidth. Report the
non-primary tile connector as disconnected during detect so compositors
only see the primary DP link and configure a single 5K mode instead of
driving both tiled streams independently.

Drive the behaviour from an EDID quirk: add a disable_second_tile panel
patch that apply_edid_quirks() sets for the affected Apple Studio
Display panel IDs (0xAE3A, 0xAE42, 0xAE46), and have detect() hide the
secondary tile when the sink carries that quirk.

Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Sun peng Li <sunpeng.li@amd.com>
Signed-off-by: Jerry Zuo <jerry.zuo@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>
Adjust for lack of movement from amdgpu_dm.c to amdgpu_dm_connector.c
Adjust for lack of analog connector support.
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
drm/amd/display: Refactor amdgpu_dm_connector_detect (v2) 2026-09-07T15:22:20+00:00 Timur Kristóf timur.kristof@gmail.com 2026-09-01T15:22:17+00:00 c6b915f0df31121524253f1410da7b3dd43e92b7 [ Upstream commit 8223a605744bb471f31018eac9075a539415b16f ] Prepare for polling analog connectors. Document the function better. Signed-off-by: Timur Kristóf <timur.kristof@gmail.com> Reviewed-by: Harry Wentland <harry.wentland@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Mario Limonciello <mario.limonciello@amd.com> Signed-off-by: Sasha Levin <sashal@kernel.org> 
[ Upstream commit 8223a605744bb471f31018eac9075a539415b16f ]

Prepare for polling analog connectors.
Document the function better.

Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
drm/amd/display: Skip PHY SSC reduction on some 8K panels 2026-09-07T15:22:20+00:00 Roman Li Roman.Li@amd.com 2026-09-01T15:22:16+00:00 a1fa3d1197cc2a5d8d55f9cab8bb07c3367431ec [ Upstream commit 144169e7be0831e09958a906d08d1856751aa6c6 ] [Why] Some 8K displays cannot tolerate the reduced phy ssc value at high link utilization and show corruption or black screen. [How] Add an EDID panel-id quirk to utilize existing skip_phy_ssc_reduction flag. To pass the link into the quirk handler, change the signature of apply_edid_quirks() to take link as an argument. The dev local in dm_helpers_parse_edid_caps() becomes unused and is removed. Fixes: 5fa62c87cffd ("drm/amd/display: Add option to disable PHY SSC reduction on transmitter enable") Reviewed-by: Alex Hung <alex.hung@amd.com> Signed-off-by: Roman Li <Roman.Li@amd.com> Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com> Tested-by: Dan Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Adjust for lack of HDMI 2.1 FRL in 6.18.y Signed-off-by: Mario Limonciello <mario.limonciello@amd.com> Signed-off-by: Sasha Levin <sashal@kernel.org> 
[ Upstream commit 144169e7be0831e09958a906d08d1856751aa6c6 ]

[Why]
Some 8K displays cannot tolerate the reduced phy ssc value
at high link utilization and show corruption or black screen.

[How]
Add an EDID panel-id quirk to utilize existing skip_phy_ssc_reduction flag.

To pass the link into the quirk handler, change the signature of
apply_edid_quirks() to take link as an argument. The dev local in
dm_helpers_parse_edid_caps() becomes unused and is removed.

Fixes: 5fa62c87cffd ("drm/amd/display: Add option to disable PHY SSC reduction on transmitter enable")
Reviewed-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Roman Li <Roman.Li@amd.com>
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Adjust for lack of HDMI 2.1 FRL in 6.18.y
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
drm/amd/display: Avoid NULL dereference in dc_dmub_srv error paths 2026-09-07T15:22:20+00:00 Srinivasan Shanmugam srinivasan.shanmugam@amd.com 2026-03-23T07:32:09+00:00 2ab18de5ebb11c76bfc8087c5a09fbcccd0dea8a [ Upstream commit 4ae3e16f4b3bf64140f773629b765d605ee079a9 ] In dc_dmub_srv_log_diagnostic_data() and dc_dmub_srv_enable_dpia_trace(). Both functions check: if (!dc_dmub_srv || !dc_dmub_srv->dmub) and then call DC_LOG_ERROR() inside that block. DC_LOG_ERROR() uses dc_dmub_srv->ctx internally. So if dc_dmub_srv is NULL, the logging itself can dereference a NULL pointer and cause a crash. Fix this by splitting the checks. First check if dc_dmub_srv is NULL and return immediately. Then check dc_dmub_srv->dmub and log the error only when dc_dmub_srv is valid. Fixes the below: ../display/dc/dc_dmub_srv.c:962 dc_dmub_srv_log_diagnostic_data() error: we previously assumed 'dc_dmub_srv' could be null (see line 961) ../display/dc/dc_dmub_srv.c:1167 dc_dmub_srv_enable_dpia_trace() error: we previously assumed 'dc_dmub_srv' could be null (see line 1166) Fixes: 2631ac1ac328 ("drm/amd/display: add DMUB registers to crash dump diagnostic data.") Fixes: 71ba6b577a35 ("drm/amd/display: Add interface to enable DPIA trace") Cc: Roman Li <roman.li@amd.com> Cc: Alex Hung <alex.hung@amd.com> Cc: Tom Chung <chiahsuan.chung@amd.com> Cc: Dan Carpenter <dan.carpenter@linaro.org> Cc: Aurabindo Pillai <aurabindo.pillai@amd.com> Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com> Reviewed-by: Alex Hung <alex.hung@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Sasha Levin <sashal@kernel.org> 
[ Upstream commit 4ae3e16f4b3bf64140f773629b765d605ee079a9 ]

In dc_dmub_srv_log_diagnostic_data() and
dc_dmub_srv_enable_dpia_trace().

Both functions check:

  if (!dc_dmub_srv || !dc_dmub_srv->dmub)

and then call DC_LOG_ERROR() inside that block.

DC_LOG_ERROR() uses dc_dmub_srv->ctx internally. So if
dc_dmub_srv is NULL, the logging itself can dereference a
NULL pointer and cause a crash.

Fix this by splitting the checks.

First check if dc_dmub_srv is NULL and return immediately.
Then check dc_dmub_srv->dmub and log the error only when
dc_dmub_srv is valid.

Fixes the below:
../display/dc/dc_dmub_srv.c:962 dc_dmub_srv_log_diagnostic_data() error: we previously assumed 'dc_dmub_srv' could be null (see line 961)
../display/dc/dc_dmub_srv.c:1167 dc_dmub_srv_enable_dpia_trace() error: we previously assumed 'dc_dmub_srv' could be null (see line 1166)

Fixes: 2631ac1ac328 ("drm/amd/display: add DMUB registers to crash dump diagnostic data.")
Fixes: 71ba6b577a35 ("drm/amd/display: Add interface to enable DPIA trace")
Cc: Roman Li <roman.li@amd.com>
Cc: Alex Hung <alex.hung@amd.com>
Cc: Tom Chung <chiahsuan.chung@amd.com>
Cc: Dan Carpenter <dan.carpenter@linaro.org>
Cc: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>
Reviewed-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
drm/amd/display: fix BT.2020 YCbCr output CSC matrices for DCE 2026-08-23T12:27:00+00:00 Nathan Lucas nlucasgit@gmail.com 2026-08-02T14:35:24+00:00 e3e6a631dcb1c32bd12c602fe51364ed5f5c3d27 commit cd22349e86faf6e15e6c622d70c0efc57d43201e upstream. The commit cited by the Fixes tag added separate limited and full-range BT.2020 YCbCr entries to the DCE output CSC tables, but populated both entries with the same matrix copied from the common DC table. That matrix combined full-range scaling with limited-range luma offset and was incorrect for both limited and full-range output. Replace the coefficients in both entries in the DCE paths with those from the new COLOR_SPACE_YCBCR2020_LIMITED_TYPE and COLOR_SPACE_YCBCR2020_FULL_TYPE entries in the preceding commit ("drm/amd/display: fix BT.2020 YCbCr limited output CSC matrix"). Fixes: 51e6668ab4ba ("drm/amd/display: add missing CSC entries for BT.2020 for DCE IPs") Assisted-by: OpenAI-Codex:GPT-5.6-Sol Tested-by: Igor Paunovic <royalnet026@gmail.com> Tested-by: Satyajit Roy <sroy14@alum.utk.edu> Signed-off-by: Nathan Lucas <nlucasgit@gmail.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> (cherry picked from commit 14c8726b79d19934d6eb6d35c612e3f7204af2c6) Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit cd22349e86faf6e15e6c622d70c0efc57d43201e upstream.

The commit cited by the Fixes tag added separate limited and full-range
BT.2020 YCbCr entries to the DCE output CSC tables, but populated both
entries with the same matrix copied from the common DC table. That
matrix combined full-range scaling with limited-range luma offset and was
incorrect for both limited and full-range output.

Replace the coefficients in both entries in the DCE paths with those from
the new COLOR_SPACE_YCBCR2020_LIMITED_TYPE
and COLOR_SPACE_YCBCR2020_FULL_TYPE entries in the preceding commit
("drm/amd/display: fix BT.2020 YCbCr limited output CSC matrix").

Fixes: 51e6668ab4ba ("drm/amd/display: add missing CSC entries for BT.2020 for DCE IPs")
Assisted-by: OpenAI-Codex:GPT-5.6-Sol
Tested-by: Igor Paunovic <royalnet026@gmail.com>
Tested-by: Satyajit Roy <sroy14@alum.utk.edu>
Signed-off-by: Nathan Lucas <nlucasgit@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 14c8726b79d19934d6eb6d35c612e3f7204af2c6)
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drm/amd/display: fix BT.2020 YCbCr limited output CSC matrix 2026-08-23T12:27:00+00:00 Nathan Lucas nlucasgit@gmail.com 2026-08-02T14:35:23+00:00 cd99fa1cbaf5a5d745b90aacc39442d10fce71d1 commit 2f9a5c0f018d4a1586ee892f81f1383219676415 upstream. COLOR_SPACE_YCBCR2020_TYPE, which is selected for COLOR_SPACE_2020_YCBCR_LIMITED color_space, has coefficients that are incorrect for limited-range output. Its luma and chroma scaling is full-range so output is too bright and colors are incorrect. COLOR_SPACE_YCBCR2020_TYPE is closer to a full-range conversion matrix with incorrect luma offset, so correct the luma offset for full-range and rename it to COLOR_SPACE_YCBCR2020_FULL_TYPE. Add COLOR_SPACE_YCBCR2020_LIMITED_TYPE with correct scaling and range for limited-range output. Fix related functions so COLOR_SPACE_YCBCR2020_LIMITED_TYPE and COLOR_SPACE_YCBCR2020_FULL_TYPE are correctly selected based on dc_color_space. Derivation of both matrices follows ITU-T H.273: Table 4, MatrixCoefficients 9, BT.2020-NCL weights: KR = 0.2627, KB = 0.0593, KG = 1 - KR - KB = 0.6780. Equations 45-47 in matrix form: [ KR KG KB 0 ] M2020_NCL = [ -KR/(2(1-KB)) -KG/(2(1-KB)) 1/2 0 ] [ 1/2 -KG/(2(1-KR)) -KB/(2(1-KR)) 0 ] [ 0 0 0 1 ] Limited and Full transforms based on equations 30-32 and 36-38 with bit depth 10, normalized by 1023: [ 876/1023 0 0 64/1023 ] MLimited = [ 0 896/1023 0 512/1023 ] [ 0 0 896/1023 512/1023 ] [ 0 0 0 1 ] [ 1023/1023 0 0 0 ] MFull = [ 0 1023/1023 0 512/1023 ] [ 0 0 1023/1023 512/1023 ] [ 0 0 0 1 ] M2020_NCL_Limited = MLimited x M2020_NCL M2020_NCL_Full = MFull x M2020_NCL The upper three rows of M2020_NCL_* are stored in CR, Y, CB order. Each M2020_NCL_* value is stored as Round(value * 8192) in its 16-bit two's-complement representation. Fixes: 973a9c810c78 ("drm/amd/display: Fix COLOR_SPACE_YCBCR2020_TYPE matrix") Assisted-by: OpenAI-Codex:GPT-5.6-Sol Tested-by: Igor Paunovic <royalnet026@gmail.com> Tested-by: Satyajit Roy <sroy14@alum.utk.edu> Signed-off-by: Nathan Lucas <nlucasgit@gmail.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> (cherry picked from commit 3b906e1dc7e3c9ff9f7940f6828b367a6a9ec73c) Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit 2f9a5c0f018d4a1586ee892f81f1383219676415 upstream.

COLOR_SPACE_YCBCR2020_TYPE, which is selected for
COLOR_SPACE_2020_YCBCR_LIMITED color_space, has coefficients that are
incorrect for limited-range output. Its luma and chroma scaling is
full-range so output is too bright and colors are incorrect.

COLOR_SPACE_YCBCR2020_TYPE is closer to a full-range conversion matrix with
incorrect luma offset, so correct the luma offset for full-range and rename
it to COLOR_SPACE_YCBCR2020_FULL_TYPE.

Add COLOR_SPACE_YCBCR2020_LIMITED_TYPE with correct scaling and range for
limited-range output.

Fix related functions so COLOR_SPACE_YCBCR2020_LIMITED_TYPE and
COLOR_SPACE_YCBCR2020_FULL_TYPE are correctly selected based on
dc_color_space.

Derivation of both matrices follows ITU-T H.273:

Table 4, MatrixCoefficients 9, BT.2020-NCL weights:
KR = 0.2627, KB = 0.0593, KG = 1 - KR - KB = 0.6780.

Equations 45-47 in matrix form:
            [  KR             KG             KB            0 ]
M2020_NCL = [ -KR/(2(1-KB))  -KG/(2(1-KB))   1/2           0 ]
            [  1/2           -KG/(2(1-KR))  -KB/(2(1-KR))  0 ]
            [  0              0              0             1 ]

Limited and Full transforms based on equations 30-32 and 36-38 with bit
depth 10, normalized by 1023:

            [ 876/1023   0         0         64/1023  ]
MLimited  = [ 0          896/1023  0         512/1023 ]
            [ 0          0         896/1023  512/1023 ]
            [ 0          0         0         1        ]

            [ 1023/1023  0         0         0        ]
    MFull = [ 0          1023/1023 0         512/1023 ]
            [ 0          0         1023/1023 512/1023 ]
            [ 0          0         0         1        ]

M2020_NCL_Limited = MLimited x M2020_NCL
M2020_NCL_Full    = MFull x M2020_NCL

The upper three rows of M2020_NCL_* are stored in CR, Y, CB order. Each
M2020_NCL_* value is stored as Round(value * 8192) in its 16-bit
two's-complement representation.

Fixes: 973a9c810c78 ("drm/amd/display: Fix COLOR_SPACE_YCBCR2020_TYPE matrix")
Assisted-by: OpenAI-Codex:GPT-5.6-Sol
Tested-by: Igor Paunovic <royalnet026@gmail.com>
Tested-by: Satyajit Roy <sroy14@alum.utk.edu>
Signed-off-by: Nathan Lucas <nlucasgit@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 3b906e1dc7e3c9ff9f7940f6828b367a6a9ec73c)
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drm/amd/display: Fix NULL pointer dereference in amdgpu_dm_crtc_set_vblank() 2026-08-23T12:27:00+00:00 Samuel Pitoiset samuel.pitoiset@gmail.com 2026-08-07T14:58:55+00:00 5045fb4c70bfde36a05e0f41cf35ddfb6d85d3af commit f2a1c4c6fe0a6fcde02e59dde546dba28d283635 upstream. amdgpu_dm_crtc_set_vblank() dereferences acrtc_state->stream when vblank is enabled/queried from DRM_IOCTL_MODE_CRTC_GET_SEQUENCE before a stream is attached to it. BUG: kernel NULL pointer dereference, address: 0000000000000008 RIP: amdgpu_dm_crtc_set_vblank+0x6b/0x4d0 [amdgpu] Call Trace: drm_vblank_enable drm_vblank_get drm_crtc_get_sequence_ioctl drm_ioctl_kernel drm_ioctl Reproduced by running VKCTS with WSI tests enabled on RADV. Guard the enable path on acrtc_state->stream being non-NULL, matching the existing checks in this function. Fixes: 34d66bc7ff10 ("drm/amd/display: Fix Xorg desktop unresponsive on Replay panel") Reviewed-by: Melissa Wen <mwen@igalia.com> Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> (cherry picked from commit 7b1b31bf6942e6f43509b48da23f8e27269aac39) Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit f2a1c4c6fe0a6fcde02e59dde546dba28d283635 upstream.

amdgpu_dm_crtc_set_vblank() dereferences acrtc_state->stream when
vblank is enabled/queried from DRM_IOCTL_MODE_CRTC_GET_SEQUENCE before
a stream is attached to it.

BUG: kernel NULL pointer dereference, address: 0000000000000008
RIP: amdgpu_dm_crtc_set_vblank+0x6b/0x4d0 [amdgpu]
Call Trace:
 drm_vblank_enable
 drm_vblank_get
 drm_crtc_get_sequence_ioctl
 drm_ioctl_kernel
 drm_ioctl

Reproduced by running VKCTS with WSI tests enabled on RADV.

Guard the enable path on acrtc_state->stream being non-NULL, matching
the existing checks in this function.

Fixes: 34d66bc7ff10 ("drm/amd/display: Fix Xorg desktop unresponsive on Replay panel")
Reviewed-by: Melissa Wen <mwen@igalia.com>
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 7b1b31bf6942e6f43509b48da23f8e27269aac39)
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Revert "drm/amd/display: Fix backlight max_brightness to match exported range" 2026-08-19T16:18:06+00:00 Alex Deucher alexander.deucher@amd.com 2026-08-12T14:49:01+00:00 59b07ccca4c0546640e72f91f1e9ff8247272abf This reverts commit 490ceacd2162de919a142bcb4eff363bb493b1de. This patch is apparently missing a dependency from 7.2 as users have not reported any regressions with 7.2-rc, but there are regressions on 6.18. The regression manifests as inconsistent lower brightness at the top end (e.g., around 98%). Closes: https://gitlab.freedesktop.org/drm/amd/-/work_items/5562 Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Cc: Thorsten Leemhuis <regressions@leemhuis.info> Cc: Sergio Callegari <sergio.callegari@gmail.com> Cc: Mario Limonciello <mario.limonciello@amd.com> Signed-off-by: Sasha Levin <sashal@kernel.org> 
This reverts commit 490ceacd2162de919a142bcb4eff363bb493b1de.

This patch is apparently missing a dependency from 7.2 as users have not
reported any regressions with 7.2-rc, but there are regressions on 6.18.

The regression manifests as inconsistent lower brightness at the top end
(e.g., around 98%).

Closes: https://gitlab.freedesktop.org/drm/amd/-/work_items/5562
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: Thorsten Leemhuis <regressions@leemhuis.info>
Cc: Sergio Callegari <sergio.callegari@gmail.com>
Cc: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
drm/amd/display: Check for tg ops in dce110_set_avmute 2026-08-19T16:17:13+00:00 Ray Wu ray.wu@amd.com 2026-08-05T01:47:17+00:00 d089f32d34f821c8f0ef23d5fcd77bd43c1b3b92 [ Upstream commit 3141e3d61469bba2624a91c5e2407f110b33b29e ] Some older DCE timing generators do not implement is_tg_enabled in their ops table. Calling it unconditionally when waiting for AV mute frames causes a NULL pointer dereference on Southern Islands dGPUs when turning the display off over HDMI. Check that tg and the required ops exist before waiting for frames. Fixes: 414da24137ac ("drm/amd/display: Add AV mute wait frames to dce110_set_avmute") Closes: https://gitlab.freedesktop.org/drm/amd/-/work_items/5557 Tested-by: Viktor Jägersküpper <viktor_jaegerskuepper@freenet.de> Signed-off-by: Ray Wu <ray.wu@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> (cherry picked from commit 2686a0c0aaa07bec2e24131835cf27b5fd4935a5) Cc: stable@vger.kernel.org Signed-off-by: Sasha Levin <sashal@kernel.org> 
[ Upstream commit 3141e3d61469bba2624a91c5e2407f110b33b29e ]

Some older DCE timing generators do not implement is_tg_enabled in
their ops table. Calling it unconditionally when waiting for AV mute
frames causes a NULL pointer dereference on Southern Islands dGPUs
when turning the display off over HDMI.

Check that tg and the required ops exist before waiting for frames.

Fixes: 414da24137ac ("drm/amd/display: Add AV mute wait frames to dce110_set_avmute")
Closes: https://gitlab.freedesktop.org/drm/amd/-/work_items/5557
Tested-by: Viktor Jägersküpper <viktor_jaegerskuepper@freenet.de>
Signed-off-by: Ray Wu <ray.wu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 2686a0c0aaa07bec2e24131835cf27b5fd4935a5)
Cc: stable@vger.kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>