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| author | Ilya Bakoulin <[email protected]> | 2023-06-02 21:01:23 +0000 |
|---|---|---|
| committer | Alex Deucher <[email protected]> | 2023-06-30 17:11:35 +0000 |
| commit | 2faa3653d6657aedf357ca74c4e58c5768899269 (patch) | |
| tree | 1ffcfb5088c427906d2f295074ee9145196c1cfa /drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.c | |
| parent | drm/amdgpu: port SRIOV VF missed changes (diff) | |
| download | kernel-2faa3653d6657aedf357ca74c4e58c5768899269.tar.gz kernel-2faa3653d6657aedf357ca74c4e58c5768899269.zip | |
drm/amd/display: Work around bad DPCD state on link loss
[Why]
This display doesn't properly indicate link loss through DPCD bits such
as CR_DONE / CHANNEL_EQ_DONE / SYMBOL_LOCKED / INTERLANE_ALIGN_DONE,
which all remain set.
In addition, DPCD200Eh doesn't match the value of DPCD204h in all cases.
For these reasons, we can miss re-training the link, since we don't
properly detect link loss with this display.
[Why]
Add display-specific workaround to read DPCD204h, so that we can detect
link loss based on 128b132b-specific status bits in this register.
Tested-by: Daniel Wheeler <[email protected]>
Reviewed-by: Wenjing Liu <[email protected]>
Acked-by: Rodrigo Siqueira <[email protected]>
Signed-off-by: Ilya Bakoulin <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.c')
0 files changed, 0 insertions, 0 deletions