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| author | Qingqing Zhuo <[email protected]> | 2021-07-22 18:48:54 +0000 |
|---|---|---|
| committer | Alex Deucher <[email protected]> | 2021-08-06 01:02:29 +0000 |
| commit | c4152b297d56d3696ad0a9003169bc5b98ad7b72 (patch) | |
| tree | e985672c7511aa76bfbee20ac53e1dad79d9fe41 /lib/debugobjects.c | |
| parent | drm/amd/display: Fix resetting DCN3.1 HW when resuming from S4 (diff) | |
| download | kernel-c4152b297d56d3696ad0a9003169bc5b98ad7b72.tar.gz kernel-c4152b297d56d3696ad0a9003169bc5b98ad7b72.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 'lib/debugobjects.c')
0 files changed, 0 insertions, 0 deletions