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| author | Qingqing Zhuo <qingqing.zhuo@amd.com> | 2021-07-22 21:48:54 +0300 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2021-08-06 04:17:58 +0300 |
| commit | dd2939efd52fdf1e554efcc44a31ba0bcf674c5e (patch) | |
| tree | 3020698cda2dc51cf1e3aee71b6187509ce72f42 /tools/perf/scripts/python/export-to-sqlite.py | |
| parent | e13c2ea2f522fecb7b2de4342e4fa10d6e15c26d (diff) | |
| download | linux-dd2939efd52fdf1e554efcc44a31ba0bcf674c5e.tar.xz | |
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 'tools/perf/scripts/python/export-to-sqlite.py')
0 files changed, 0 insertions, 0 deletions