drm/amd/display: Adjust DP 8b10b LT exit behavior

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[Why]
Polling SINK_STATUS DPCD can cause some non-DP2.0 LTTPR hubs to hang and
no longer respond to AUX.

[How]
As a workaround for the problem hubs, and also to more closely match
DP spec 8b10b behavior, don't poll for intra-hop AUX reply indication
on 8b10b-encoded links.

Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com>
Acked-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Ilya Bakoulin <Ilya.Bakoulin@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Ilya Bakoulin 2022-11-02 15:56:16 -04:00 • committed by Alex Deucher

parent 158858bf1a

commit 180f33d27a

1 changed files with 11 additions and 9 deletions

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drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c

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