From: Hersen Wu <hersenxs.wu@amd.com>
Date: Mon, 23 Oct 2017 09:11:46 -0400
Subject: drm/amd/display: Handle as MST first and then DP dongle if sink
 support both
Git-commit: 58fe8990fc29336c9ea6531d9ecc44466d3b9221
Patch-mainline: v4.15-rc2
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Signed-off-by: Hersen Wu <hersenxs.wu@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Reviewed-by: Wenjing Liu <Wenjing.Liu@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.c |   32 +++++++++++++-------------
 1 file changed, 16 insertions(+), 16 deletions(-)

--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -480,22 +480,6 @@ static void detect_dp(
 		sink_caps->signal = SIGNAL_TYPE_DISPLAY_PORT;
 		detect_dp_sink_caps(link);
 
-		/* DP active dongles */
-		if (is_dp_active_dongle(link)) {
-			link->type = dc_connection_active_dongle;
-			if (!link->dpcd_caps.sink_count.bits.SINK_COUNT) {
-				/*
-				 * active dongle unplug processing for short irq
-				 */
-				link_disconnect_sink(link);
-				return;
-			}
-
-			if (link->dpcd_caps.dongle_type !=
-			DISPLAY_DONGLE_DP_HDMI_CONVERTER) {
-				*converter_disable_audio = true;
-			}
-		}
 		if (is_mst_supported(link)) {
 			sink_caps->signal = SIGNAL_TYPE_DISPLAY_PORT_MST;
 			link->type = dc_connection_mst_branch;
@@ -535,6 +519,22 @@ static void detect_dp(
 				sink_caps->signal = SIGNAL_TYPE_DISPLAY_PORT;
 			}
 		}
+
+		if (link->type != dc_connection_mst_branch &&
+			is_dp_active_dongle(link)) {
+			/* DP active dongles */
+			link->type = dc_connection_active_dongle;
+			if (!link->dpcd_caps.sink_count.bits.SINK_COUNT) {
+				/*
+				 * active dongle unplug processing for short irq
+				 */
+				link_disconnect_sink(link);
+				return;
+			}
+
+			if (link->dpcd_caps.dongle_type != DISPLAY_DONGLE_DP_HDMI_CONVERTER)
+				*converter_disable_audio = true;
+		}
 	} else {
 		/* DP passive dongles */
 		sink_caps->signal = dp_passive_dongle_detection(link->ddc,