drm/amd/display: Serialize HDMI FRL status polling against link detect

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[WHY]
The HDMI FRL status polling work can run concurrently with link detect
after an unplug/replug. Both paths access the same link through DDC and may
perform FRL link training, while the polling path also reads link state
without holding dc_lock.

[HOW]
Use mutex_trylock() to serialize the complete link walk, FRL status
polling, and retraining sequence with dc_lock. If the lock is busy,
defer the background poll to the next 200ms cycle instead of blocking
an active detect, modeset, or flip.

Signed-off-by: Fangzhi Zuo <jerry.zuo@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Fangzhi Zuo 2026-09-13 14:12:23 -04:00 • committed by Alex Deucher

parent c84879b763

commit 3e6272b40c

1 changed files with 21 additions and 14 deletions

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

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