platform: msm_shared: Configure TPG mode for 8909

Add support to configure the mode for TPG
which will be used during the null commit for
video mode panels.

Change-Id: Ic1fd891848072d00624ece30cd7a1038b0594393
Signed-off-by: Krishna Manikandan <mkrishn@codeaurora.org>
diff --git a/platform/msm_shared/mdp3.c b/platform/msm_shared/mdp3.c
index b9169c1..5333656 100644
--- a/platform/msm_shared/mdp3.c
+++ b/platform/msm_shared/mdp3.c
@@ -1,4 +1,4 @@
-/* Copyright (c) 2011-2015, 2017, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2011-2015, 2017-2018, The Linux Foundation. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
@@ -152,6 +152,7 @@
 	writel(0x00ABCDEF, MDP_DSI_VIDEO_BORDER_CLR);
 	writel(0x00000000, MDP_DSI_VIDEO_HSYNC_SKEW);
 	writel(0x00000000, MDP_DSI_VIDEO_CTL_POLARITY);
+	writel(0x70000000, MDP_DSI_VIDEO_TEST_CTL);
 	// end of cmd mdp
 
 	return 0;