+/**
+ * Waits for a sequence number to be signaled, and cleans up the
+ * request and object lists appropriately for that event.
+ */
+static int
+i915_wait_request(struct drm_device *dev, uint32_t seqno)
+{
+ return i915_do_wait_request(dev, seqno, 1);
+}
+
+/**
+ * Waits for the ring to finish up to the latest request. Usefull for waiting
+ * for flip events, e.g for the overlay support. */
+int i915_lp_ring_sync(struct drm_device *dev)
+{
+ uint32_t seqno;
+ int ret;
+
+ seqno = i915_add_request(dev, NULL, 0);
+
+ if (seqno == 0)
+ return -ENOMEM;
+
+ ret = i915_do_wait_request(dev, seqno, 0);
+ BUG_ON(ret == -ERESTARTSYS);
+ return ret;
+}
+