[PATCH 05/20] drm/amd/display: Disable FEC if DSC not supported for EDP

[Pavle Kotarac]

From: Iswara Nagulendran <inagulen at amd.com>

[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 <USER DID NOT SET AN EMAIL>
Reviewed-by: Evgenii Krasnikov <Evgenii.Krasnikov at amd.com>
Reviewed-by: Nicholas Choi <Nicholas.Choi at amd.com>
Acked-by: Pavle Kotarac <Pavle.Kotarac at amd.com>
Signed-off-by: Iswara Nagulendran <inagulen at amd.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc_link.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
index 22f2d88fab99..c1a727ff8b1d 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -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);
-- 
2.32.0