drm/amd/display: Extend DMUB wait for DIG PHY programming commands

[Why]
DIG transmitter ENABLE and voltage/pre-emphasis VBIOS commands can
take longer than the default inbox timeout after amdgpu reload, while
DMCUB runs extended DPPHY polling before advancing INBOX1 RPTR.

[How]
Extend the waiting time to 500ms

Reviewed-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Wayne Lin <Wayne.Lin@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Wayne Lin 2026-07-29 09:59:10 +08:00 • committed by Alex Deucher
commit e92d0314f3