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From f9c3ad9cf9ffb05ce4f2b0ea5f58f81415594c57 Mon Sep 17 00:00:00 2001
From: Yongqiang Sun <yongqiang.sun@amd.com>
Date: Wed, 9 Mar 2016 14:56:16 -0500
Subject: [PATCH 0893/1110] drm/amd/dal: Fixed DP passive dongle not light up
issue
Signed-off-by: Yongqiang Sun <yongqiang.sun@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
drivers/gpu/drm/amd/dal/dc/core/dc_link.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/dal/dc/core/dc_link.c b/drivers/gpu/drm/amd/dal/dc/core/dc_link.c
index 0232956..fd406f9 100644
--- a/drivers/gpu/drm/amd/dal/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/dal/dc/core/dc_link.c
@@ -99,7 +99,13 @@ static bool program_hpd_filter(
case SIGNAL_TYPE_DISPLAY_PORT:
case SIGNAL_TYPE_DISPLAY_PORT_MST:
/* Program hpd filter to allow DP signal to settle */
- delay_on_connect_in_ms = 20;
+ /* 500: not able to detect MST <-> SST switch as HPD is low for
+ * only 100ms on DELL U2413
+ * 0: some passive dongle still show aux mode instead of i2c
+ * 20-50:not enough to hide bouncing HPD with passive dongle.
+ * also see intermittent i2c read issues.
+ */
+ delay_on_connect_in_ms = 80;
delay_on_disconnect_in_ms = 0;
break;
case SIGNAL_TYPE_LVDS:
--
2.7.4
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