drm/exynos: enable vsync interrupt while waiting for vblank

mixer_wait_for_vblank function expects that the upcoming
vsync interrupt handler routine will clear the
wait_vsync_event atomic variable.

For this to happen, interrupts should be enabled and
disabled properly.

Signed-off-by: Rahul Sharma <rahul.sharma@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c
index 6f1858187e28..7529946d0a74 100644
--- a/drivers/gpu/drm/exynos/exynos_mixer.c
+++ b/drivers/gpu/drm/exynos/exynos_mixer.c
@@ -1019,6 +1019,8 @@ static void mixer_wait_for_vblank(struct exynos_drm_manager *mgr)
         }
         mutex_unlock(&mixer_ctx->mixer_mutex);
 
+        drm_vblank_get(mgr->crtc->dev, mixer_ctx->pipe);
+
         atomic_set(&mixer_ctx->wait_vsync_event, 1);
 
         /*
@@ -1029,6 +1031,8 @@ static void mixer_wait_for_vblank(struct exynos_drm_manager *mgr)
                                 !atomic_read(&mixer_ctx->wait_vsync_event),
                                 HZ/20))
                 DRM_DEBUG_KMS("vblank wait timed out.\n");
+
+        drm_vblank_put(mgr->crtc->dev, mixer_ctx->pipe);
 }
 
 static void mixer_window_suspend(struct exynos_drm_manager *mgr)