kernel/linux.git/drivers/gpu/drm/amd/display/dc, branch v6.6.93

drm/amd/display: fix link_set_dpms_off multi-display MST corner case

2025-06-04T12:42:25+00:00

[ Upstream commit 3c1a467372e0c356b1d3c59f6d199ed5a6612dd1 ] [Why & How] When MST config is unplugged/replugged too quickly, it can potentially result in a scenario where previous DC state has not been reset before the HPD link detection sequence begins. In this case, driver will disable the streams/link prior to re-enabling the link for link training. There is a bug in the current logic that does not account for the fact that current_state can be released and cleared prior to swapping to a new state (resulting in the pipe_ctx stream pointers to be cleared) in between disabling streams. To resolve this, cache the original streams prior to committing any stream updates. Reviewed-by: Wenjing Liu Signed-off-by: George Shen Signed-off-by: Ray Wu Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher (cherry picked from commit 1561782686ccc36af844d55d31b44c938dd412dc) Signed-off-by: Sasha Levin

drm/amd/display: Increase block_sequence array size

2025-06-04T12:42:10+00:00

[ Upstream commit 3a7810c212bcf2f722671dadf4b23ff70a7d23ee ] [Why] It's possible to generate more than 50 steps in hwss_build_fast_sequence, for example with a 6-pipe asic where all pipes are in one MPC chain. This overflows the block_sequence buffer and corrupts block_sequence_steps, causing a crash. [How] Expand block_sequence to 100 items. A naive upper bound on the possible number of steps for a 6-pipe asic, ignoring the potential for steps to be mutually exclusive, is 91 with current code, therefore 100 is sufficient. Reviewed-by: Alvin Lee Signed-off-by: Joshua Aberback Signed-off-by: Wayne Lin Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin

drm/amd/display: Initial psr_version with correct setting

2025-06-04T12:42:10+00:00

[ Upstream commit d8c782cac5007e68e7484d420168f12d3490def6 ] [Why & How] The initial setting for psr_version is not correct while create a virtual link. The default psr_version should be DC_PSR_VERSION_UNSUPPORTED. Reviewed-by: Roman Li Signed-off-by: Tom Chung Signed-off-by: Zaeem Mohamed Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin

drm/amd/display: Update CR AUX RD interval interpretation

2025-06-04T12:42:10+00:00

[ Upstream commit 6a7fde433231c18164c117592d3e18ced648ad58 ] [Why] DP spec updated to have the CR AUX RD interval match the EQ AUX RD interval interpretation of DPCD 0000Eh/0220Eh for 8b/10b non-LTTPR mode and LTTPR transparent mode cases. [How] Update interpretation of DPCD 0000Eh/0220Eh for CR AUX RD interval during 8b/10b link training. Reviewed-by: Michael Strauss Reviewed-by: Wenjing Liu Signed-off-by: George Shen Signed-off-by: Zaeem Mohamed Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin

drm/amd/display: Don't try AUX transactions on disconnected link

2025-06-04T12:42:10+00:00

[ Upstream commit e8bffa52e0253cfd689813a620e64521256bc712 ] [Why] Setting link DPMS off in response to HPD disconnect creates AUX transactions on a link that is supposed to be disconnected. This can cause issues in some cases when the sink re-asserts HPD and expects source to re-enable the link. [How] Avoid AUX transactions on disconnected link. Reviewed-by: Wenjing Liu Signed-off-by: Ilya Bakoulin Signed-off-by: Aurabindo Pillai Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin

drm/amd/display: Add support for disconnected eDP streams

2025-06-04T12:42:07+00:00

[ Upstream commit 6571bef25fe48c642f7a69ccf7c3198b317c136a ] [Why] eDP may not be connected to the GPU on driver start causing fail enumeration. [How] Move the virtual signal type check before the eDP connector signal check. Reviewed-by: Wenjing Liu Signed-off-by: Harry VanZyllDeJong Signed-off-by: Roman Li Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin

drm/amd/display: handle max_downscale_src_width fail check

2025-06-04T12:42:05+00:00

[ Upstream commit 02a940da2ccc0cc0299811379580852b405a0ea2 ] [WHY] If max_downscale_src_width check fails, we exit early from TAP calculation and left a NULL value to the scaling data structure to cause the zero divide in the DML validation. [HOW] Call set default TAP calculation before early exit in get_optimal_number_of_taps due to max downscale limit exceed. Reviewed-by: Samson Tam Signed-off-by: Yihan Zhu Signed-off-by: Zaeem Mohamed Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin

drm/amd/display: Skip checking FRL_MODE bit for PCON BW determination

2025-06-04T12:42:02+00:00

[ Upstream commit 0584bbcf0c53c133081100e4f4c9fe41e598d045 ] [Why/How] Certain PCON will clear the FRL_MODE bit despite supporting the link BW indicated in the other bits. Thus, skip checking the FRL_MODE bit when interpreting the hdmi_encoded_link_bw struct. Reviewed-by: Wenjing Liu Signed-off-by: George Shen Signed-off-by: Wayne Lin Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin

drm/amd/display: Fix incorrect DPCD configs while Replay/PSR switch

2025-06-04T12:42:00+00:00

[ Upstream commit 0d9cabc8f591ea1cd97c071b853b75b155c13259 ] [Why] When switching between PSR/Replay, the DPCD config of previous mode is not cleared, resulting in unexpected behavior in TCON. [How] Initialize the DPCD in setup function Reviewed-by: Robin Chen Signed-off-by: Leon Huang Signed-off-by: Tom Chung Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin

drm/amd/display: calculate the remain segments for all pipes

2025-06-04T12:42:00+00:00

[ Upstream commit d3069feecdb5542604d29b59acfd1fd213bad95b ] [WHY] In some cases the remain de-tile buffer segments will be greater than zero if we don't add the non-top pipe to calculate, at this time the override de-tile buffer size will be valid and used. But it makes the de-tile buffer segments used finally for all of pipes exceed the maximum. [HOW] Add the non-top pipe to calculate the remain de-tile buffer segments. Don't set override size to use the average according to pipe count if the value exceed the maximum. Reviewed-by: Charlene Liu Signed-off-by: Zhikai Zhai Signed-off-by: Tom Chung Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin