From: Charlene Liu <charlene.liu@amd.com>
Date: Wed, 31 Jan 2018 16:45:26 -0500
Subject: drm/amd/display: boot up/S4 fix mainlink off before BL.
Git-commit: 91d4a12900347636a049038c289c3999a388e082
Patch-mainline: v4.17-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Signed-off-by: Charlene Liu <charlene.liu@amd.com>
Reviewed-by: Krunoslav Kovac <Krunoslav.Kovac@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 |    2 +-
 1 file changed, 1 insertion(+), 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
@@ -1484,7 +1484,7 @@ void dce110_enable_accelerated_mode(stru
 
 	struct dc_link *edp_link = get_link_for_edp(dc);
 	if (dcb->funcs->get_vga_enabled_displays(dc->ctx->dc_bios) != 0) {
-		if (edp_link_to_turnoff) {
+		if (edp_link) {
 			/*we need turn off backlight before DP_blank and encoder powered down, todo add optimization*/
 			dc->hwss.edp_backlight_control(edp_link, false);
 		}