drm/amd/display: Prevent dpcd reads with passive dongles

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[why]
During hotplug, a DP port may be connected to the sink through
passive adapter which does not support DPCD reads. Issuing reads
without checking for this condition will result in errors

[how]
Ensure the link is in aux_mode before initiating operation that result
in a DPCD read.

Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

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Aurabindo Pillai 2020-04-22 14:37:33 -04:00 • committed by Alex Deucher

parent 65d6836982

commit 7b353e41b4

1 changed files with 11 additions and 6 deletions

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

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