drm/amd/display: Skip HDMI FRL status polling while link is down

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[WHY]
Hotplugging an HDMI FRL sink can wedge DMCUB when a poll-driven retrain
lands on a link whose PHY has just been torn down. The status polling
path can program PHY EQ on the disabled PHY, after which the sink SCDC
reads back version 0 and the display fails to light up.

[HOW]
Skip FRL status polling unless the link is actively driving a stream.
The check runs under dc_lock, so it is serialized with link detection
and modesets while the PHY is being torn down.

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 2026-09-15 10:36:03 -04:00 • committed by Alex Deucher

parent 47598b1683

commit c396c883a9

2 changed files with 5 additions and 2 deletions

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6

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

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1

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

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