drm: Only handle _DRM_VBLANK_NEXTONMISS once

Consolidate the _DRM_VBLANK_NEXTONMISS handling between drm_wait_vblank
and drm_queue_vblank_event.

This is a cleanup spotted while working on other changes.

(The way it was previously handled could also theoretically result in
drm_queue_vblank_event unnecessarily bumping vblwait->request.sequence,
if the vblank counter happened to increment between the
drm_vblank_count(_and_time) calls in each function, but that's unlikely)

Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1466755187-29418-1-git-send-email-michel@daenzer.net

diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 149453c9dc26cf21533466c2d7b068bfb093418a..e98b24b24cba2dd53ac9c6cb1bb7c9432467e04e 100644 (file)
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -1588,12 +1588,6 @@ static int drm_queue_vblank_event(struct drm_device *dev, unsigned int pipe,
 
        seq = drm_vblank_count_and_time(dev, pipe, &now);
 
-       if ((vblwait->request.type & _DRM_VBLANK_NEXTONMISS) &&
-           (seq - vblwait->request.sequence) <= (1 << 23)) {
-               vblwait->request.sequence = seq + 1;
-               vblwait->reply.sequence = vblwait->request.sequence;
-       }
-
        DRM_DEBUG("event on vblank count %d, current %d, crtc %u\n",
                  vblwait->request.sequence, seq, pipe);
 
@@ -1690,6 +1684,11 @@ int drm_wait_vblank(struct drm_device *dev, void *data,
                goto done;
        }
 
+       if ((flags & _DRM_VBLANK_NEXTONMISS) &&
+           (seq - vblwait->request.sequence) <= (1 << 23)) {
+               vblwait->request.sequence = seq + 1;
+       }
+
        if (flags & _DRM_VBLANK_EVENT) {
                /* must hold on to the vblank ref until the event fires
                 * drm_vblank_put will be called asynchronously
@@ -1697,11 +1696,6 @@ int drm_wait_vblank(struct drm_device *dev, void *data,
                return drm_queue_vblank_event(dev, pipe, vblwait, file_priv);
        }
 
-       if ((flags & _DRM_VBLANK_NEXTONMISS) &&
-           (seq - vblwait->request.sequence) <= (1<<23)) {
-               vblwait->request.sequence = seq + 1;
-       }
-
        DRM_DEBUG("waiting on vblank count %d, crtc %u\n",
                  vblwait->request.sequence, pipe);
        vblank->last_wait = vblwait->request.sequence;