drm/amd/display: Use the maximum link setting which EDP reported.

Signed-off-by: Hugo Hu <hugo.hu@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>

drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c

@@ -1470,6 +1470,12 @@ void decide_link_settings(struct dc_stream_state *stream,
 		return;
 	}
 
+	/* EDP use the link cap setting */
+	if (stream->sink->sink_signal == SIGNAL_TYPE_EDP) {
+		*link_setting = link->verified_link_cap;
+		return;
+	}
+
 	/* search for the minimum link setting that:
 	 * 1. is supported according to the link training result
 	 * 2. could support the b/w requested by the timing