[Nouveau] [PATCH] drm/nouveau: Use drm_vblank_count_and_time() for pageflip completion events.

[Mario Kleiner]

Emit kms pageflip completion events with proper vblank count
and timestamp for the vblank interval in which the pageflip
completed. This makes the timestamps and counts consistent with
what the OML_sync_control spec defines.

Signed-off-by: Mario Kleiner <mario.kleiner at tuebingen.mpg.de>
---
 drivers/gpu/drm/nouveau/nouveau_display.c |   29 +++++++++++++++++++++++------
 drivers/gpu/drm/nouveau/nouveau_drv.h     |    1 +
 2 files changed, 24 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
index eb514ea..6644e8d 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -292,7 +292,7 @@ nouveau_crtc_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb,
 	*s = (struct nouveau_page_flip_state)
 		{ { }, event, nouveau_crtc(crtc)->index,
 		  fb->bits_per_pixel, fb->pitch, crtc->x, crtc->y,
-		  new_bo->bo.offset };
+		  new_bo->bo.offset, crtc->framedur_ns };
 
 	/* Choose the channel the flip will be handled in */
 	chan = nouveau_fence_channel(new_bo->bo.sync_obj);
@@ -335,6 +335,9 @@ nouveau_finish_page_flip(struct nouveau_channel *chan,
 	struct drm_device *dev = chan->dev;
 	struct nouveau_page_flip_state *s;
 	unsigned long flags;
+	struct timeval tnow, tvbl;
+
+	do_gettimeofday(&tnow);
 
 	spin_lock_irqsave(&dev->event_lock, flags);
 
@@ -348,12 +351,26 @@ nouveau_finish_page_flip(struct nouveau_channel *chan,
 			     struct nouveau_page_flip_state, head);
 	if (s->event) {
 		struct drm_pending_vblank_event *e = s->event;
-		struct timeval now;
 
-		do_gettimeofday(&now);
-		e->event.sequence = 0;
-		e->event.tv_sec = now.tv_sec;
-		e->event.tv_usec = now.tv_usec;
+		e->event.sequence = drm_vblank_count_and_time(dev, s->crtc, &tvbl);
+
+		/* Called before vblank count and timestamp have
+		 * been updated for the vblank interval of flip
+		 * completion? If so, need to increment vblank count and
+		 * add one videorefresh duration to returned timestamp
+		 * to account for this. We assume this happened if we
+		 * get called over 0.9 frame durations after the last
+		 * timestamped vblank.
+		 */
+		if (10 * (timeval_to_ns(&tnow) - timeval_to_ns(&tvbl)) >
+		     9 * s->framedur_ns) {
+			e->event.sequence++;
+			tvbl = ns_to_timeval(timeval_to_ns(&tvbl) +
+			s->framedur_ns);
+		}
+
+		e->event.tv_sec = tvbl.tv_sec;
+		e->event.tv_usec = tvbl.tv_usec;
 		list_add_tail(&e->base.link, &e->base.file_priv->event_list);
 		wake_up_interruptible(&e->base.file_priv->event_wait);
 	}
diff --git a/drivers/gpu/drm/nouveau/nouveau_drv.h b/drivers/gpu/drm/nouveau/nouveau_drv.h
index 72bfc14..d873b37 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drv.h
+++ b/drivers/gpu/drm/nouveau/nouveau_drv.h
@@ -202,6 +202,7 @@ struct nouveau_page_flip_state {
 	struct drm_pending_vblank_event *event;
 	int crtc, bpp, pitch, x, y;
 	uint64_t offset;
+	s64 framedur_ns;
 };
 
 enum nouveau_channel_mutex_class {
-- 
1.7.4.1