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-rw-r--r--shared-core/radeon_irq.c39
1 files changed, 39 insertions, 0 deletions
diff --git a/shared-core/radeon_irq.c b/shared-core/radeon_irq.c
index 7b170389..d652f1d2 100644
--- a/shared-core/radeon_irq.c
+++ b/shared-core/radeon_irq.c
@@ -163,6 +163,45 @@ int radeon_emit_and_wait_irq(drm_device_t *dev)
}
+int radeon_vblank_wait(drm_device_t *dev, unsigned int *sequence)
+{
+ drm_radeon_private_t *dev_priv =
+ (drm_radeon_private_t *)dev->dev_private;
+ unsigned int cur_vblank;
+ int ret = 0;
+
+ if ( !dev_priv ) {
+ DRM_ERROR( "%s called with no initialization\n", __func__ );
+ return DRM_ERR(EINVAL);
+ }
+
+ /* Assume that the user has missed the current sequence number by about
+ * a day rather than she wants to wait for years using vertical blanks :)
+ */
+ while ( ( ( cur_vblank = atomic_read(&dev->vbl_received ) )
+ + ~*sequence + 1 ) > (1<<23) ) {
+ dev_priv->stats.boxes |= RADEON_BOX_WAIT_IDLE;
+#ifdef __linux__
+ interruptible_sleep_on( &dev->vbl_queue );
+
+ if (signal_pending(current)) {
+ ret = -EINTR;
+ break;
+ }
+#endif /* __linux__ */
+#ifdef __FreeBSD__
+ ret = tsleep( &dev_priv->vbl_queue, 3*hz, "rdnvbl", PZERO | PCATCH);
+ if (ret)
+ break;
+#endif /* __FreeBSD__ */
+ }
+
+ *sequence = cur_vblank;
+
+ return ret;
+}
+
+
/* Needs the lock as it touches the ring.
*/
int radeon_irq_emit( DRM_IOCTL_ARGS )