drm/amd/display: Retry when read dpcd caps failed.

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Some DP panel not detected intermittently due to read dpcd
caps failed when doing hot plug.
[root cause] DC_HPD_CONNECT_INT_DELAY is set to 0, not delay
after HPD toggle and read dpcd data, while some panel need 4ms defer
to read.
[solution] Add a retry when read failed.

Signed-off-by: Yongqiang Sun <yongqiang.sun@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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Yongqiang Sun 2018-03-07 09:12:53 -05:00 • committed by Alex Deucher

parent ba0a5aaa86

commit 3c1a312aa4

1 changed files with 11 additions and 5 deletions

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

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