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drm/amd/display: implement workaround for riommu related hang

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[Why]
During S4/S5/reboot, sometimes riommu invalidation request arrive too
early, DCN may be unable to respond to the invalidation request
resulting in pstate hang.

[How]
VBIOS will force allow pstate for riommu invalidation and driver will
clear it after powering down display pipes.

Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Eric Yang <Eric.Yang2@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Eric Yang 2021-06-23 15:48:02 -04:00 • committed by Alex Deucher
commit 32f1d0cfc3
6 changed files with 27 additions and 2 deletions
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