From: Roman Li <Roman.Li@amd.com>
Date: Fri, 20 Oct 2017 10:15:18 -0400
Subject: drm/amd/display: Fix S3 topology change
Git-commit: 3eb4eba42263cc1e810d79b4970cbcb096c210ab
Patch-mainline: v4.15-rc2
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Clean fake sink flag on resume if real sink connected.
Fixing S3 topology change problem like this:
1) x desktop with 1 or > displays
2) unplug display
3) suspend
4) replug same display
5) resume
without this change replugged display doesn't light up

Signed-off-by: Roman Li <Roman.Li@amd.com>
Reviewed-by: Sun peng Li <Sunpeng.Li@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -677,6 +677,10 @@ int amdgpu_dm_display_resume(struct amdg
 
 		mutex_lock(&aconnector->hpd_lock);
 		dc_link_detect(aconnector->dc_link, DETECT_REASON_HPD);
+
+		if (aconnector->fake_enable && aconnector->dc_link->local_sink)
+			aconnector->fake_enable = false;
+
 		aconnector->dc_sink = NULL;
 		amdgpu_dm_update_connector_after_detect(aconnector);
 		mutex_unlock(&aconnector->hpd_lock);