From: Andrew Jiang <Andrew.Jiang@amd.com>
Date: Wed, 13 Sep 2017 11:36:34 -0400
Subject: drm/amd/display: power_down_Hw need signal type to turnoff backlight
Git-commit: 68d77dd8214e5186d535ec7af29722aaad621824
Patch-mainline: v4.15-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Signed-off-by: Charlene Liu <charlene.liu@amd.com>
Reviewed-by: Anthony Koo <Anthony.Koo@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/dce110/dce110_hw_sequencer.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
@@ -1171,6 +1171,7 @@ static void power_down_encoders(struct d
 {
 	int i;
 	enum connector_id connector_id;
+	enum signal_type signal = SIGNAL_TYPE_NONE;
 	for (i = 0; i < dc->link_count; i++) {
 		connector_id = dal_graphics_object_id_get_connector_id(dc->links[i]->link_id);
 		if ((connector_id == CONNECTOR_ID_DISPLAY_PORT) ||
@@ -1178,10 +1179,12 @@ static void power_down_encoders(struct d
 
 			if (!dc->links[i]->wa_flags.dp_keep_receiver_powered)
 				dp_receiver_power_ctrl(dc->links[i], false);
+			if (connector_id == CONNECTOR_ID_EDP)
+				signal = SIGNAL_TYPE_EDP;
 		}
 
 		dc->links[i]->link_enc->funcs->disable_output(
-				dc->links[i]->link_enc, SIGNAL_TYPE_NONE);
+				dc->links[i]->link_enc, signal);
 	}
 }