drm/amd/display: 7 retries + 50 ms timeout on AUX DEFER

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[WHY]
DP 2.0 SCR specifies that TX devices must retry at least 7 times when
receiving an AUX DEFER reply from RX. In addition, the specification
states that the TX shall not retry indefinitely, and gives a suggestive
timeout interval of 50ms.

[HOW]
Keep retrying until both 7 or more retries have been made, and the 50ms
interval has passed.

Signed-off-by: Wesley Chalmers <Wesley.Chalmers@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Anson Jacob <Anson.Jacob@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

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Wesley Chalmers 2021-03-29 13:27:47 -04:00 • committed by Alex Deucher

parent d307ce4b6c

commit 1d5b15f77e

1 changed files with 15 additions and 3 deletions

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drivers/gpu/drm/amd/display/dc/dce/dce_aux.c

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