mirror_ubuntu-kernels/drivers/gpu/drm/amd
Qingqing Zhuo dd2939efd5 drm/amd/display: workaround for hard hang on HPD on native DP
[Why]
HPD disable and enable sequences are not mutually exclusive
on Linux. For HPDs that spans over 1s (i.e. HPD low = 1s),
part of the disable sequence (specifically, a request to SMU
to lower refclk) could come right before the call to PHY
enable, causing DMUB to access an unresponsive PHY
and thus a hard hang on the system.

[How]
Disable 48mhz refclk off on native DP.

Reviewed-by: Hersen Wu <hersenxs.wu@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2021-08-05 21:17:58 -04:00
..
acp
amdgpu drm/amd/amdgpu: remove redundant host to psp cmd buf allocations 2021-08-05 21:17:58 -04:00
amdkfd drm/amdkfd: Only apply heavy-weight TLB flush on Aldebaran 2021-08-02 17:21:25 -04:00
display drm/amd/display: workaround for hard hang on HPD on native DP 2021-08-05 21:17:58 -04:00
include drm/amdgpu: add mp 11.0.8 header for cyan_skillfish 2021-07-23 10:08:01 -04:00
pm drm/amd/pm: correct aldebaran smu feature mapping FEATURE_DATA_CALCULATIONS 2021-08-05 21:17:58 -04:00