From: Wenjing Liu <Wenjing.Liu@amd.com>
Date: Thu, 14 Sep 2017 18:50:32 -0400
Subject: drm/amd/display: set cp25201 to use TPS4
Git-commit: 25bab0da8f61e7d8f717e4f9be34e97a1aaa0ccc
Patch-mainline: v4.15-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166
[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@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 16 ++++++++++++++--
1 file changed, 14 insertions(+), 2 deletions(-)
--- 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(s
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_patter
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;