From: Hersen Wu <hersenxs.wu@amd.com>
Date: Tue, 10 Oct 2017 16:28:02 -0400
Subject: drm/amd/display: LGD panel willl flash line under window
Git-commit: b9b171fffc9358be9e98cbc2bc7ef3fbe029f170
Patch-mainline: v4.15-rc1
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>
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 |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
@@ -1399,6 +1399,15 @@ static void power_down_encoders(struct d
 	int i;
 	enum connector_id connector_id;
 	enum signal_type signal = SIGNAL_TYPE_NONE;
+
+	/* do not know BIOS back-front mapping, simply blank all. It will not
+	 * hurt for non-DP
+	 */
+	for (i = 0; i < dc->res_pool->stream_enc_count; i++) {
+		dc->res_pool->stream_enc[i]->funcs->dp_blank(
+					dc->res_pool->stream_enc[i]);
+	}
+
 	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) ||