drm/exynos: fixed page flip issue.

with vblank_refcount = 1, there was the case that drm_vblank_put
is called by specific page flip function so this patch fixes the
issue.

Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/exynos/exynos_drm_crtc.c b/drivers/gpu/drm/exynos/exynos_drm_crtc.c
index e3861ac..de81883 100644 (file)
--- a/drivers/gpu/drm/exynos/exynos_drm_crtc.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_crtc.c
@@ -307,9 +307,6 @@ static int exynos_drm_crtc_page_flip(struct drm_crtc *crtc,
                 */
                event->pipe = exynos_crtc->pipe;
 
-               list_add_tail(&event->base.link,
-                               &dev_priv->pageflip_event_list);
-
                ret = drm_vblank_get(dev, exynos_crtc->pipe);
                if (ret) {
                        DRM_DEBUG("failed to acquire vblank counter\n");
@@ -318,6 +315,9 @@ static int exynos_drm_crtc_page_flip(struct drm_crtc *crtc,
                        goto out;
                }
 
+               list_add_tail(&event->base.link,
+                               &dev_priv->pageflip_event_list);
+
                crtc->fb = fb;
                ret = exynos_drm_crtc_update(crtc);
                if (ret) {

diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimd.c b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
index b6a737d..0dbb32b 100644 (file)
--- a/drivers/gpu/drm/exynos/exynos_drm_fimd.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
@@ -604,7 +604,12 @@ static void fimd_finish_pageflip(struct drm_device *drm_dev, int crtc)
        }
 
        if (is_checked) {
-               drm_vblank_put(drm_dev, crtc);
+               /*
+                * call drm_vblank_put only in case that drm_vblank_get was
+                * called.
+                */
+               if (atomic_read(&drm_dev->vblank_refcount[crtc]) > 0)
+                       drm_vblank_put(drm_dev, crtc);
 
                /*
                 * don't off vblank if vblank_disable_allowed is 1,

diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c
index 4796167..93846e8 100644 (file)
--- a/drivers/gpu/drm/exynos/exynos_mixer.c
+++ b/drivers/gpu/drm/exynos/exynos_mixer.c
@@ -712,7 +712,12 @@ static void mixer_finish_pageflip(struct drm_device *drm_dev, int crtc)
        }
 
        if (is_checked)
-               drm_vblank_put(drm_dev, crtc);
+               /*
+                * call drm_vblank_put only in case that drm_vblank_get was
+                * called.
+                */
+               if (atomic_read(&drm_dev->vblank_refcount[crtc]) > 0)
+                       drm_vblank_put(drm_dev, crtc);
 
        spin_unlock_irqrestore(&drm_dev->event_lock, flags);
 }