Index: drmP.h
===================================================================
RCS file: /home/ncvs/src/sys/dev/drm/drmP.h,v
retrieving revision 1.47.2.1
diff -u -r1.47.2.1 drmP.h
--- drmP.h	23 Sep 2011 00:51:37 -0000	1.47.2.1
+++ drmP.h	22 Jun 2012 22:23:29 -0000
@@ -731,7 +731,8 @@
 d_poll_t drm_poll;
 d_mmap_t drm_mmap;
 extern drm_local_map_t	*drm_getsarea(struct drm_device *dev);
-
+extern struct drm_file	*drm_find_file_by_proc(struct drm_device *dev,
+					       DRM_STRUCTPROC *p);
 /* File operations helpers (drm_fops.c) */
 extern int		drm_open_helper(struct cdev *kdev, int flags, int fmt,
 					 DRM_STRUCTPROC *p,
Index: drm_fops.c
===================================================================
RCS file: /home/ncvs/src/sys/dev/drm/drm_fops.c,v
retrieving revision 1.8.2.1
diff -u -r1.8.2.1 drm_fops.c
--- drm_fops.c	23 Sep 2011 00:51:37 -0000	1.8.2.1
+++ drm_fops.c	22 Jun 2012 22:22:10 -0000
@@ -39,6 +39,23 @@
 
 #include "dev/drm/drmP.h"
 
+struct drm_file *
+drm_find_file_by_proc(struct drm_device *dev, DRM_STRUCTPROC *p)
+{
+	uid_t uid = p->td_ucred->cr_svuid;
+	pid_t pid = p->td_proc->p_pid;
+	struct drm_file *priv;
+
+	DRM_SPINLOCK_ASSERT(&dev->dev_lock);
+
+	TAILQ_FOREACH(priv, &dev->files, link) {
+		if (priv->pid == pid && priv->uid == uid)
+			return priv;
+	}
+
+	return NULL;
+}
+
 /* drm_open_helper is called whenever a process opens /dev/drm. */
 int drm_open_helper(struct cdev *kdev, int flags, int fmt, DRM_STRUCTPROC *p,
 		    struct drm_device *dev)
Index: radeon_drv.c
===================================================================
RCS file: /home/ncvs/src/sys/dev/drm/radeon_drv.c,v
retrieving revision 1.20.4.1
diff -u -r1.20.4.1 radeon_drv.c
--- radeon_drv.c	23 Sep 2011 00:51:37 -0000	1.20.4.1
+++ radeon_drv.c	22 Jun 2012 22:34:07 -0000
@@ -99,6 +99,36 @@
 }
 
 static int
+radeon_suspend(device_t kdev)
+{
+	struct drm_device *dev = device_get_softc(kdev);
+	drm_radeon_cp_stop_t stop_args;
+
+	stop_args.flush = stop_args.idle = 0;
+	DRM_LOCK();
+	if (drm_find_file_by_proc(dev, DRM_CURPROC) &&
+	    radeon_cp_stop(dev, &stop_args, dev->lock.file_priv) != 0)
+		return (EBUSY);
+	DRM_UNLOCK();
+
+	return (bus_generic_suspend(kdev));
+}
+
+static int
+radeon_resume(device_t kdev)
+{
+	struct drm_device *dev = device_get_softc(kdev);
+
+	DRM_LOCK();
+	if (drm_find_file_by_proc(dev, DRM_CURPROC) &&
+	    radeon_cp_resume(dev, NULL, NULL) != 0)
+		return (EBUSY);
+	DRM_UNLOCK();
+	
+	return (bus_generic_resume(kdev));
+}
+
+static int
 radeon_detach(device_t kdev)
 {
 	struct drm_device *dev = device_get_softc(kdev);
@@ -115,6 +145,8 @@
 	/* Device interface */
 	DEVMETHOD(device_probe,		radeon_probe),
 	DEVMETHOD(device_attach,	radeon_attach),
+	DEVMETHOD(device_suspend,	radeon_suspend),
+	DEVMETHOD(device_resume,	radeon_resume),
 	DEVMETHOD(device_detach,	radeon_detach),
 
 	{ 0, 0 }