drm/amd/display: Handle downstream LTTPR with fixed VS sequence

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[Why]
Several issues were discovered that caused link
training to fail when an LTTPR device is
connected downstream for the fixed VS sequence.

[How]
The following were added:
- workaround to configure AUX timeout
for fixed VS sequence
- additional delay before disabling
fixed VS intercept
- detection of fixed VS deadlock state and
performing DPCD sequence to recover

Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Meenakshikumar Somasundaram <Meenakshikumar.Somasundaram@amd.com>
Acked-by: Alan Liu <HaoPing.Liu@amd.com>
Signed-off-by: George Shen <George.Shen@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

George Shen 2022-01-31 14:31:14 -05:00 • committed by Alex Deucher

parent a3e731260b

commit 0bbd1c7de3

3 changed files with 40 additions and 6 deletions

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43

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

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2

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

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1

drivers/gpu/drm/amd/display/dc/dcn31/dcn31_resource.c

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