drm/amd/display: Don't try AUX transactions on disconnected link

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[ Upstream commit e8bffa52e0 ]

[Why]
Setting link DPMS off in response to HPD disconnect creates AUX
transactions on a link that is supposed to be disconnected. This can
cause issues in some cases when the sink re-asserts HPD and expects
source to re-enable the link.

[How]
Avoid AUX transactions on disconnected link.

Reviewed-by: Wenjing Liu <wenjing.liu@amd.com>
Signed-off-by: Ilya Bakoulin <Ilya.Bakoulin@amd.com>
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Ilya Bakoulin 2025-01-28 13:14:54 -05:00 • committed by Greg Kroah-Hartman

parent ab83ed96f7

commit 6881a3a588

1 changed files with 5 additions and 3 deletions

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drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_phy.c

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