[PATCH 1/1] drm: fix drm_update_vblank_count for software vblank counter

[Vincent Abriou]

Drivers with software vblank counter relies on the on drm core to update
vblank counter and they should not be concern about the warning that
check hardware counter coherency.

Further, the generic message that tracks the current and last counter
values must be counter type (hardware or software) agnostic.

Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Signed-off-by: Vincent Abriou <vincent.abriou at st.com>
---
 drivers/gpu/drm/drm_irq.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 88fbee4..88041b4 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -219,11 +219,12 @@ static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe,
 	} else {
 		/* some kind of default for drivers w/o accurate vbl timestamping */
 		diff = (flags & DRM_CALLED_FROM_VBLIRQ) != 0;
+		if (diff == 0)
+			return;
 	}
 
-	DRM_DEBUG("updating vblank count on crtc %u:"
-		  " current=%u, diff=%u, hw=%u hw_last=%u\n",
-		  pipe, vblank->count, diff, cur_vblank, vblank->last);
+	DRM_DEBUG("updating vblank count on crtc %u: diff=%u cur=%u last=%u\n",
+		  pipe, diff, cur_vblank, vblank->last);
 
 	if (diff == 0) {
 		WARN_ON_ONCE(cur_vblank != vblank->last);
-- 
1.9.1