drm/exynos: enable vblank after DPMS on

Before DPMS off driver disables vblank.
It should be balanced by vblank enable after DPMS on.
The patch fixes issue with page_flip ioctl not being able
to acquire vblank counter introduced by patch:
drm: Always reject drm_vblank_get() after drm_vblank_off()

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/gpu/drm/exynos/exynos_drm_crtc.c b/drivers/gpu/drm/exynos/exynos_drm_crtc.c
index 8e38e9f8e542..45026e693225 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_crtc.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_crtc.c
@@ -71,13 +71,16 @@ static void exynos_drm_crtc_dpms(struct drm_crtc *crtc, int mode)
                                 !atomic_read(&exynos_crtc->pending_flip),
                                 HZ/20))
                         atomic_set(&exynos_crtc->pending_flip, 0);
-                drm_vblank_off(crtc->dev, exynos_crtc->pipe);
+                drm_crtc_vblank_off(crtc);
         }
 
         if (manager->ops->dpms)
                 manager->ops->dpms(manager, mode);
 
         exynos_crtc->dpms = mode;
+
+        if (mode == DRM_MODE_DPMS_ON)
+                drm_crtc_vblank_on(crtc);
 }
 
 static void exynos_drm_crtc_prepare(struct drm_crtc *crtc)