[PATCH 018/103] drm/amd/display: set cp25201 to use TPS4

[Harry Wentland]

From: Wenjing Liu <Wenjing.Liu at amd.com>

[Description]
hbr2 compliance eye output is unstable
(toggling on and off) with debugger break.
This caueses intermittent PHY automation failure.
Need to look into the root cause later

Signed-off-by: Wenjing Liu <Wenjing.Liu at amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng at amd.com>
Acked-by: Harry Wentland <Harry.Wentland at amd.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
index b735782b8fe0..ced42484dcfc 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
@@ -1700,6 +1700,12 @@ static void dp_test_send_link_training(struct dc_link *link)
 	dp_retrain_link_dp_test(link, &link_settings, false);
 }
 
+/* TODO hbr2 compliance eye output is unstable
+ * (toggling on and off) with debugger break
+ * This caueses intermittent PHY automation failure
+ * Need to look into the root cause */
+static uint8_t force_tps4_for_cp2520 = 1;
+
 static void dp_test_send_phy_test_pattern(struct dc_link *link)
 {
 	union phy_test_pattern dpcd_test_pattern;
@@ -1758,10 +1764,16 @@ static void dp_test_send_phy_test_pattern(struct dc_link *link)
 		test_pattern = DP_TEST_PATTERN_80BIT_CUSTOM;
 		break;
 	case PHY_TEST_PATTERN_CP2520_1:
-		test_pattern = DP_TEST_PATTERN_HBR2_COMPLIANCE_EYE;
+		/* CP2520 pattern is unstable, temporarily use TPS4 instead */
+		test_pattern = (force_tps4_for_cp2520 == 1) ?
+				DP_TEST_PATTERN_TRAINING_PATTERN4 :
+				DP_TEST_PATTERN_HBR2_COMPLIANCE_EYE;
 		break;
 	case PHY_TEST_PATTERN_CP2520_2:
-		test_pattern = DP_TEST_PATTERN_CP2520_2;
+		/* CP2520 pattern is unstable, temporarily use TPS4 instead */
+		test_pattern = (force_tps4_for_cp2520 == 1) ?
+				DP_TEST_PATTERN_TRAINING_PATTERN4 :
+				DP_TEST_PATTERN_HBR2_COMPLIANCE_EYE;
 		break;
 	case PHY_TEST_PATTERN_CP2520_3:
 		test_pattern = DP_TEST_PATTERN_TRAINING_PATTERN4;
-- 
2.14.1