This patch fixes the issue that drm_vblank_get() is failed.
The issus occurs when next page flip request is tried if previous page flip event wasn't completed yet and then dpms became off.
So this patch make sure that page flip event is completed before dpms goes to off.
Signed-off-by: Inki Dae inki.dae@samsung.com Signed-off-by: Kyungmin Park kyungmin.park@samsung.com --- drivers/gpu/drm/exynos/exynos_drm_crtc.c | 16 ++++++++++++++++ 1 files changed, 16 insertions(+), 0 deletions(-)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_crtc.c b/drivers/gpu/drm/exynos/exynos_drm_crtc.c index e8894bc..69a77e9 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_crtc.c +++ b/drivers/gpu/drm/exynos/exynos_drm_crtc.c @@ -48,6 +48,8 @@ struct exynos_drm_crtc { unsigned int pipe; unsigned int dpms; enum exynos_crtc_mode mode; + wait_queue_head_t pending_flip_queue; + atomic_t pending_flip; };
static void exynos_drm_crtc_dpms(struct drm_crtc *crtc, int mode) @@ -61,6 +63,13 @@ static void exynos_drm_crtc_dpms(struct drm_crtc *crtc, int mode) return; }
+ if (mode > DRM_MODE_DPMS_ON) { + /* wait for the completion of page flip. */ + wait_event(exynos_crtc->pending_flip_queue, + atomic_read(&exynos_crtc->pending_flip) == 0); + drm_vblank_off(crtc->dev, exynos_crtc->pipe); + } + exynos_drm_fn_encoder(crtc, &mode, exynos_drm_encoder_crtc_dpms); exynos_crtc->dpms = mode; } @@ -225,6 +234,7 @@ static int exynos_drm_crtc_page_flip(struct drm_crtc *crtc, spin_lock_irq(&dev->event_lock); list_add_tail(&event->base.link, &dev_priv->pageflip_event_list); + atomic_set(&exynos_crtc->pending_flip, 1); spin_unlock_irq(&dev->event_lock);
crtc->fb = fb; @@ -344,6 +354,8 @@ int exynos_drm_crtc_create(struct drm_device *dev, unsigned int nr)
exynos_crtc->pipe = nr; exynos_crtc->dpms = DRM_MODE_DPMS_OFF; + init_waitqueue_head(&exynos_crtc->pending_flip_queue); + atomic_set(&exynos_crtc->pending_flip, 0); exynos_crtc->plane = exynos_plane_init(dev, 1 << nr, true); if (!exynos_crtc->plane) { kfree(exynos_crtc); @@ -398,6 +410,8 @@ void exynos_drm_crtc_finish_pageflip(struct drm_device *dev, int crtc) { struct exynos_drm_private *dev_priv = dev->dev_private; struct drm_pending_vblank_event *e, *t; + struct drm_crtc *drm_crtc = dev_priv->crtc[crtc]; + struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(drm_crtc); struct timeval now; unsigned long flags;
@@ -419,6 +433,8 @@ void exynos_drm_crtc_finish_pageflip(struct drm_device *dev, int crtc) list_move_tail(&e->base.link, &e->base.file_priv->event_list); wake_up_interruptible(&e->base.file_priv->event_wait); drm_vblank_put(dev, crtc); + atomic_set(&exynos_crtc->pending_flip, 0); + wake_up(&exynos_crtc->pending_flip_queue); }
spin_unlock_irqrestore(&dev->event_lock, flags);