[PATCH 5/5] drm/exynos: enable vsync interrupt while waiting for vblank

[Rahul Sharma <rahul.sharma@samsung.com>]

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>
---
 drivers/gpu/drm/exynos/exynos_mixer.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c
index 6f18581..7927f2e 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);
 
+	mixer_enable_vblank(mgr);
+
 	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");
+
+	mixer_disable_vblank(mgr);
 }
 
 static void mixer_window_suspend(struct exynos_drm_manager *mgr)
-- 
1.7.9.5