drm/exynos: fixed page flip bug.

in case of using two drivers such as fimd and hdmi controller that
they have their own hardware interrupt, drm framework doesn't provide
pipe number corresponding to it. so the pipe should be set to event's
from specific crtc.

Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>
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>

drivers/gpu/drm/exynos/exynos_drm_crtc.c

@@ -259,13 +259,21 @@ static int exynos_drm_crtc_page_flip(struct drm_crtc *crtc,
 
 	mutex_lock(&dev->struct_mutex);
 
-	if (event && !dev_priv->pageflip_event) {
+	if (event) {
+		/*
+		 * the pipe from user always is 0 so we can set pipe number
+		 * of current owner to event.
+		 */
+		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");
+			list_del(&event->base.link);
+
 			goto out;
 		}
 
@@ -274,20 +282,18 @@ static int exynos_drm_crtc_page_flip(struct drm_crtc *crtc,
 		if (ret) {
 			crtc->fb = old_fb;
 			drm_vblank_put(dev, exynos_crtc->pipe);
-			dev_priv->pageflip_event = false;
+			list_del(&event->base.link);
 
 			goto out;
 		}
 
 		/*
 		 * the values related to a buffer of the drm framebuffer
 		 * to be applied should be set at here. because these values
-		 * first, is set to shadow registers and then to
+		 * first, are set to shadow registers and then to
 		 * real registers at vsync front porch period.
 		 */
 		exynos_drm_crtc_apply(crtc);
-
-		dev_priv->pageflip_event = true;
 	}
 out:
 	mutex_unlock(&dev->struct_mutex);

drivers/gpu/drm/exynos/exynos_drm_drv.c

@@ -124,6 +124,19 @@ static int exynos_drm_unload(struct drm_device *dev)
 	return 0;
 }
 
+static void exynos_drm_preclose(struct drm_device *dev,
+					struct drm_file *file_priv)
+{
+	struct exynos_drm_private *dev_priv = dev->dev_private;
+
+	/*
+	 * drm framework frees all events at release time,
+	 * so private event list should be cleared.
+	 */
+	if (!list_empty(&dev_priv->pageflip_event_list))
+		INIT_LIST_HEAD(&dev_priv->pageflip_event_list);
+}
+
 static void exynos_drm_lastclose(struct drm_device *dev)
 {
 	DRM_DEBUG_DRIVER("%s\n", __FILE__);
@@ -152,6 +165,7 @@ static struct drm_driver exynos_drm_driver = {
 				  DRIVER_MODESET | DRIVER_GEM,
 	.load			= exynos_drm_load,
 	.unload			= exynos_drm_unload,
+	.preclose		= exynos_drm_preclose,
 	.lastclose		= exynos_drm_lastclose,
 	.get_vblank_counter	= drm_vblank_count,
 	.enable_vblank		= exynos_drm_crtc_enable_vblank,

drivers/gpu/drm/exynos/exynos_drm_drv.h

@@ -187,9 +187,8 @@ struct exynos_drm_manager {
 struct exynos_drm_private {
 	struct drm_fb_helper *fb_helper;
 
-	/* for pageflip */
+	/* list head for new event to be added. */
 	struct list_head pageflip_event_list;
-	bool pageflip_event;
 
 	/*
 	 * created crtc object would be contained at this array and

drivers/gpu/drm/exynos/exynos_drm_fimd.c

@@ -487,21 +487,24 @@ static struct exynos_drm_overlay_ops fimd_overlay_ops = {
 	.disable = fimd_win_disable,
 };
 
-/* for pageflip event */
 static void fimd_finish_pageflip(struct drm_device *drm_dev, int crtc)
 {
 	struct exynos_drm_private *dev_priv = drm_dev->dev_private;
 	struct drm_pending_vblank_event *e, *t;
 	struct timeval now;
 	unsigned long flags;
-
-	if (!dev_priv->pageflip_event)
-		return;
+	bool is_checked = false;
 
 	spin_lock_irqsave(&drm_dev->event_lock, flags);
 
 	list_for_each_entry_safe(e, t, &dev_priv->pageflip_event_list,
 			base.link) {
+		/* if event's pipe isn't same as crtc then ignor it. */
+		if (crtc != e->pipe)
+			continue;
+
+		is_checked = true;
+
 		do_gettimeofday(&now);
 		e->event.sequence = 0;
 		e->event.tv_sec = now.tv_sec;
@@ -511,8 +514,8 @@ static void fimd_finish_pageflip(struct drm_device *drm_dev, int crtc)
 		wake_up_interruptible(&e->base.file_priv->event_wait);
 	}
 
-	drm_vblank_put(drm_dev, crtc);
-	dev_priv->pageflip_event = false;
+	if (is_checked)
+		drm_vblank_put(drm_dev, crtc);
 
 	spin_unlock_irqrestore(&drm_dev->event_lock, flags);
 }