drm/amd/display: Ignore First MST Sideband Message Return Error

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[why]
First MST sideband message returns AUX_RET_ERROR_HPD_DISCON
on certain intel platform. Aux transaction considered failure
if HPD unexpected pulled low. The actual aux transaction success
in such case, hence do not return error.

[how]
Not returning error when AUX_RET_ERROR_HPD_DISCON detected
on the first sideband message.

v2: squash in additional DMI entries
v3: squash in static fix

Signed-off-by: Fangzhi Zuo <Jerry.Zuo@amd.com>
Acked-by: Solomon Chiu <solomon.chiu@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Fangzhi Zuo 2022-07-06 15:52:46 -04:00 • committed by Alex Deucher

parent 50e8ca0b67

commit 57b9f3384c

3 changed files with 64 additions and 0 deletions

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39

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

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8

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h

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17

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c

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