From: Yue Hin Lau <Yuehin.Lau@amd.com>
Date: Wed, 27 Jun 2018 13:49:20 -0400
Subject: drm/amd/display: Add NULL check for local sink in edp_power_control
Git-commit: 6c4fff068f7940993b3ec74a9996f4b514089d1a
Patch-mainline: v4.19-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

[WHY]
PNP cause bsod regression fix

[HOW]
Add NULL check

Signed-off-by: Yue Hin Lau <Yuehin.Lau@amd.com>
Reviewed-by: Hugo Hu <Hugo.Hu@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 |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
@@ -871,9 +871,11 @@ void hwss_edp_power_control(
 			unsigned long long wait_time_ms = 0;
 
 			/* max 500ms from LCDVDD off to on */
-			unsigned long long edp_poweroff_time_ms =
-					500 + link->local_sink->edid_caps.panel_patch.extra_t12_ms;
+			unsigned long long edp_poweroff_time_ms = 500;
 
+			if (link->local_sink != NULL)
+				edp_poweroff_time_ms =
+						500 + link->local_sink->edid_caps.panel_patch.extra_t12_ms;
 			if (link->link_trace.time_stamp.edp_poweroff == 0)
 				wait_time_ms = edp_poweroff_time_ms;
 			else if (duration_in_ms < edp_poweroff_time_ms)