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drm/amd/display: Block zstate when more than one plane enabled

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[Why]
Currently Z10 save/restore only covers 1 plane case. If we enter
Z10 with 2 planes enabled, 1 of the 2 planes will not be restored.
causing black screen.

[How]
Disable Zstate when more than 1 plane is enabled. Right now Z9 enable
but Z10 disable is not a supported config, so we disable both.

Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Reviewed-by: Nevenko Stupar <Nevenko.Stupar@amd.com>
Acked-by: Agustin Gutierrez <agustin.gutierrez@amd.com>
Signed-off-by: Eric Yang <Eric.Yang2@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Eric Yang 2022-03-10 17:20:38 -05:00 committed by Alex Deucher
parent d853419f5f
commit c791d75a64
1 changed files with 10 additions and 6 deletions
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16
drivers/gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.c
View File

@ -730,18 +730,22 @@ static enum dcn_zstate_support_state decide_zstate_support(struct dc *dc, struc
}
/*
* Zstate is allowed in following scenarios:
* 1. Single eDP with PSR enabled
* 2. 0 planes (No memory requests)
* 3. Single eDP without PSR but > 5ms stutter period
* Z9 and Z10 allowed cases:
* 1. 0 Planes enabled
* 2. single eDP, on link 0, 1 plane and stutter period > 5ms
* Z10 only cases:
* 1. single eDP, on link 0, 1 plane and stutter period >= 5ms
* Zstate not allowed cases:
* 1. Everything else
*/
if (plane_count == 0)
return DCN_ZSTATE_SUPPORT_ALLOW;
else if (context->stream_count == 1 && context->streams[0]->signal == SIGNAL_TYPE_EDP) {
struct dc_link *link = context->streams[0]->sink->link;
struct dc_stream_status *stream_status = &context->stream_status[0];
/* zstate only supported on PWRSEQ0 */
if (link->link_index != 0)
/* zstate only supported on PWRSEQ0 and when there's <2 planes*/
if (link->link_index != 0 || stream_status->plane_count > 1)
return DCN_ZSTATE_SUPPORT_DISALLOW;
if (context->bw_ctx.dml.vba.StutterPeriod > 5000.0)