drm/amd/display: add dummy pstate workaround to dcn315

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DCN315 has to always allow pstate change or SMU will hang. This
workaround achieves this by applying a low pstate change latency
to be used when pstate is calculated to be unsupported. This lower
latency only accounts for memory retraining; a previous change
handles locking in the highest available pstate allowing us to minimize
required latency hiding to only account for memory retraining.

Reviewed-by: Charlene Liu <Charlene.Liu@amd.com>
Acked-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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This commit is contained in:

Dmytro Laktyushkin 2022-09-16 15:55:55 -04:00 • committed by Alex Deucher

parent e4e481e4d8

commit 4931ce22ec

4 changed files with 27 additions and 69 deletions

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4

drivers/gpu/drm/amd/display/dc/dcn30/dcn30_resource.c

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2

drivers/gpu/drm/amd/display/dc/dcn315/dcn315_resource.c

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89

drivers/gpu/drm/amd/display/dc/dml/dcn31/dcn31_fpu.c

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1

drivers/gpu/drm/amd/display/dc/dml/dcn31/dcn31_fpu.h

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