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drm/amd/display: Disable FEC if DSC not supported for EDP

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[WHY]
Screen was seen corrupted for a few ms
when switching both ways. There was also
not enough bandwidth for HDR to be
enabled in HG disabled mode.
This was due to FEC being
enabled although DSC was not supported
or disabled for the EDP.

[HOW]
Check for EDP DSC support in DC caps
or if DSC should be disabled for EDP
before enabling FEC for EDP.

Reviewed-by: Harry Vanzylldejong <harry.vanzylldejong@amd.com>
Reviewed-by: Evgenii Krasnikov <Evgenii.Krasnikov@amd.com>
Reviewed-by: Nicholas Choi <Nicholas.Choi@amd.com>
Acked-by: Pavle Kotarac <Pavle.Kotarac@amd.com>
Signed-off-by: Iswara Nagulendran <inagulen@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Iswara Nagulendran 2022-01-05 17:56:25 -05:00 committed by Alex Deucher
parent 6866a60a8e
commit 9e6a04651e
1 changed files with 4 additions and 2 deletions
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6
drivers/gpu/drm/amd/display/dc/core/dc_link.c
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@ -4663,8 +4663,10 @@ bool dc_link_should_enable_fec(const struct dc_link *link)
link->local_sink->edid_caps.panel_patch.disable_fec)
force_disable = true;
else if (link->connector_signal == SIGNAL_TYPE_EDP
&& link->dpcd_caps.dsc_caps.dsc_basic_caps.fields.
dsc_support.DSC_SUPPORT == false)
&& (link->dpcd_caps.dsc_caps.dsc_basic_caps.fields.
dsc_support.DSC_SUPPORT == false
|| link->dc->debug.disable_dsc_edp
|| !link->dc->caps.edp_dsc_support))
force_disable = true;
return !force_disable && dc_link_is_fec_supported(link);