From 138b87fa43b629ed14429e2e056fe4d5ef132921 Mon Sep 17 00:00:00 2001
From: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Date: Thu, 29 Jun 2017 15:37:20 +0300
Subject: [PATCH] drm: vblank: Fix vblank timestamp update
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Git-commit: 138b87fa43b629ed14429e2e056fe4d5ef132921
Patch-mainline: v4.13-rc1
References: FATE#322643 bsc#1055900

Commit 3fcdcb270936 ("drm/vblank: Switch to bool in_vblank_irq in
get_vblank_timestamp") inverted a condition by mistake that resulted in
vblank timestamps always being 0 on hardware without a vblank counter.
Fix it.

Fixes: 3fcdcb270936 ("drm/vblank: Switch to bool in_vblank_irq in get_vblank_timestamp")
Suggested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20170629123720.27173-1-laurent.pinchart+renesas@ideasonboard.com
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/drm_vblank.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/drm_vblank.c
+++ b/drivers/gpu/drm/drm_vblank.c
@@ -242,7 +242,7 @@ static void drm_update_vblank_count(stru
 	 * Otherwise reinitialize delayed at next vblank interrupt and assign 0
 	 * for now, to mark the vblanktimestamp as invalid.
 	 */
-	if (!rc && in_vblank_irq)
+	if (!rc && !in_vblank_irq)
 		t_vblank = (struct timeval) {0, 0};
 
 	store_vblank(dev, pipe, diff, &t_vblank, cur_vblank);