From f2abac16bfbb2965a78836c058743b9877bbfc10 Mon Sep 17 00:00:00 2001
From: Robin Chen <po-tchen@amd.com>
Date: Tue, 21 Jun 2022 00:18:55 +0800
Subject: drm/amd/display: Disable PSRSU when DSC enabled on the specific sink
Git-commit: e2facd575fdf13b718f6c833ed546467a3e6e3ba
Patch-mainline: v6.0-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225 jsc#PED-2849

[Why]
Some specific sink is not able to support PSRSU when DSC is turned on.
For this case, fall-back to use PSR1.

Reviewed-by: Anthony Koo <Anthony.Koo@amd.com>
Acked-by: Solomon Chiu <solomon.chiu@amd.com>
Signed-off-by: Robin Chen <po-tchen@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 .../amd/display/modules/power/power_helpers.c | 33 ++++++++++---------
 1 file changed, 17 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/modules/power/power_helpers.c b/drivers/gpu/drm/amd/display/modules/power/power_helpers.c
index bc239d38c3c7..235259d6c5a1 100644
--- a/drivers/gpu/drm/amd/display/modules/power/power_helpers.c
+++ b/drivers/gpu/drm/amd/display/modules/power/power_helpers.c
@@ -794,33 +794,34 @@ bool dmcu_load_iram(struct dmcu *dmcu,
  */
 bool is_psr_su_specific_panel(struct dc_link *link)
 {
-	if (link->dpcd_caps.edp_rev >= DP_EDP_14) {
-		if (link->dpcd_caps.psr_info.psr_version >= DP_PSR2_WITH_Y_COORD_ET_SUPPORTED)
-			return true;
+	bool isPSRSUSupported = false;
+	struct dpcd_caps *dpcd_caps = &link->dpcd_caps;
+
+	if (dpcd_caps->edp_rev >= DP_EDP_14) {
+		if (dpcd_caps->psr_info.psr_version >= DP_PSR2_WITH_Y_COORD_ET_SUPPORTED)
+			isPSRSUSupported = true;
 		/*
 		 * Some panels will report PSR capabilities over additional DPCD bits.
 		 * Such panels are approved despite reporting only PSR v3, as long as
 		 * the additional bits are reported.
 		 */
-		if (link->dpcd_caps.psr_info.psr_version < DP_PSR2_WITH_Y_COORD_IS_SUPPORTED)
-			return false;
-
-		if (link->dpcd_caps.sink_dev_id == DP_BRANCH_DEVICE_ID_001CF8) {
+		if (dpcd_caps->sink_dev_id == DP_BRANCH_DEVICE_ID_001CF8) {
 			/*
-			 * FIXME:
 			 * This is the temporary workaround to disable PSRSU when system turned on
-			 * DSC function on the sepcific sink. Once the PSRSU + DSC is fixed, this
-			 * condition should be removed.
+			 * DSC function on the sepcific sink.
 			 */
-			if (link->dpcd_caps.dsc_caps.dsc_basic_caps.fields.dsc_support.DSC_SUPPORT)
-				return false;
-
-			if (link->dpcd_caps.psr_info.force_psrsu_cap == 0x1)
-				return true;
+			if (dpcd_caps->psr_info.psr_version < DP_PSR2_WITH_Y_COORD_IS_SUPPORTED)
+				isPSRSUSupported = false;
+			else if (dpcd_caps->dsc_caps.dsc_basic_caps.fields.dsc_support.DSC_SUPPORT &&
+				((dpcd_caps->sink_dev_id_str[1] == 0x08 && dpcd_caps->sink_dev_id_str[0] == 0x08) ||
+				(dpcd_caps->sink_dev_id_str[1] == 0x08 && dpcd_caps->sink_dev_id_str[0] == 0x07)))
+				isPSRSUSupported = false;
+			else if (dpcd_caps->psr_info.force_psrsu_cap == 0x1)
+				isPSRSUSupported = true;
 		}
 	}
 
-	return false;
+	return isPSRSUSupported;
 }
 
 /**
-- 
2.38.1