diff options
| author | Qingqing Zhuo <qingqing.zhuo@amd.com> | 2021-07-22 14:48:54 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2021-08-05 21:02:29 -0400 |
| commit | c4152b297d56d3696ad0a9003169bc5b98ad7b72 (patch) | |
| tree | e985672c7511aa76bfbee20ac53e1dad79d9fe41 /drivers/gpu/drm/amd/amdgpu/amdgpu_atomfirmware.h | |
| parent | d5c5ac3a7bca35261eb599204cbf1efee0af22cc (diff) | |
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>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_atomfirmware.h')
0 files changed, 0 insertions, 0 deletions