drm/amd/display: Refine aux transaction before retrieve caps

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[Why]
LTTPR caps will read fail if aux channel is not active.

[How]
1.Perform 600 read upto 10 retry with 1ms delay in between.
2.If fail, return false and trigger another retry detection.
3.If pass, read LTTPR caps in retrieve link caps.

Reviewed-by: Jimmy Kizito <Jimmy.Kizito@amd.com>
Acked-by: Brian Chang <Brian.Chang@amd.com>
Signed-off-by: Lewis Huang <Lewis.Huang@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

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Lewis Huang 2022-08-08 13:20:16 +08:00 • committed by Alex Deucher

parent 9af611f290

commit 6ebdaf20fc

1 changed files with 34 additions and 11 deletions

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45

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

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