drm/msm/dpu: move vblank events to complete_commit()

We could get a vblank event racing with the current atomic commit,
resulting in sending the pageflip event to userspace early, causing
tearing.  On the other hand, complete_commit() ensures that the
pending flush is complete.
Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Abhinav Kumar <abhinavk@codeaurora.org>

drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c

@@ -297,7 +297,6 @@ void dpu_crtc_vblank_callback(struct drm_crtc *crtc)
 		dpu_crtc->vblank_cb_time = ktime_get();
 	else
 		dpu_crtc->vblank_cb_count++;
-	_dpu_crtc_complete_flip(crtc);
 	drm_crtc_handle_vblank(crtc);
 	trace_dpu_crtc_vblank_cb(DRMID(crtc));
 }
@@ -402,6 +401,7 @@ static void dpu_crtc_frame_event_cb(void *data, u32 event)
 void dpu_crtc_complete_commit(struct drm_crtc *crtc)
 {
 	trace_dpu_crtc_complete_commit(DRMID(crtc));
+	_dpu_crtc_complete_flip(crtc);
 }
 
 static void _dpu_crtc_setup_lm_bounds(struct drm_crtc *crtc,