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drm/amd/display: Block z-states when stutter period exceeds criteria

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[Why]
Stutter period won't be less than 5000.0, but if PSR is enabled then we
can potentially enter Z9 when MPO is enabled.

SMU will try to enter Z9 too early in these cases (before PSR is
enabled) and we'll see underflow.

[How]
Block z-states (z9, z10) until we can add a new interface to SMU to
signal when we can support z10 but not z9.

We can revert this once the interface change is in.

Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Eric Yang <Eric.Yang2@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Nicholas Kazlauskas 2021-12-07 12:58:07 -05:00 committed by Alex Deucher
parent 21bf3e6f14
commit 2d0158497a
1 changed files with 1 additions and 2 deletions
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3
drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c
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@ -3093,8 +3093,7 @@ static enum dcn_zstate_support_state decide_zstate_support(struct dc *dc, struc
else if (context->stream_count == 1 && context->streams[0]->signal == SIGNAL_TYPE_EDP) {
struct dc_link *link = context->streams[0]->sink->link;
if ((link->link_index == 0 && link->psr_settings.psr_feature_enabled)
|| context->bw_ctx.dml.vba.StutterPeriod > 5000.0)
if (link->link_index == 0 && context->bw_ctx.dml.vba.StutterPeriod > 5000.0)
return DCN_ZSTATE_SUPPORT_ALLOW;
else
return DCN_ZSTATE_SUPPORT_DISALLOW;