drm/amd/display: Force p-state disallow if leaving no plane config

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[ Upstream commit 9a902a9073 ]

[Description]
- When we're in a no plane config, DCN is always asserting
  P-State allow
- This creates a scenario where the P-State blackout can start
  just as VUPDATE takes place and transitions the DCN config to
  a one where one or more HUBP's are active which can result in
  underflow
- To fix this issue, force p-state disallow and unforce after
  the transition from no planes case -> one or more planes active

Reviewed-by: Samson Tam <samson.tam@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alvin Lee <alvin.lee2@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Alvin Lee 2023-12-06 14:52:32 -05:00 • committed by Greg Kroah-Hartman

parent 6750d1de74

commit e9ca61a7e6

1 changed files with 20 additions and 0 deletions

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drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c

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