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| author | Qingqing Zhuo <[email protected]> | 2021-07-22 18:48:54 +0000 |
|---|---|---|
| committer | Alex Deucher <[email protected]> | 2021-08-06 01:17:58 +0000 |
| commit | dd2939efd52fdf1e554efcc44a31ba0bcf674c5e (patch) | |
| tree | 3020698cda2dc51cf1e3aee71b6187509ce72f42 /drivers/gpu/drm/amd/amdgpu/amdgpu_atomfirmware.c | |
| parent | drm/amd/display: Add check for validating unsupported ODM plus MPO case (diff) | |
| download | kernel-dd2939efd52fdf1e554efcc44a31ba0bcf674c5e.tar.gz kernel-dd2939efd52fdf1e554efcc44a31ba0bcf674c5e.zip | |
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 <[email protected]>
Acked-by: Aurabindo Pillai <[email protected]>
Signed-off-by: Qingqing Zhuo <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_atomfirmware.c')
0 files changed, 0 insertions, 0 deletions