added checking for engine idle: which is actually the case over here :-)

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@10666 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/accelerants/nvidia/engine/nv_acc_dma.c

@@ -31,7 +31,12 @@ blit
 status_t nv_acc_wait_idle_dma()
 {
 	/* wait until engine completely idle */
-	//fixme: implement.
+	//fixme: add dma buffer state checking stuff here..
+	while (ACCR(STATUS))
+	{
+		/* snooze a bit so I do not hammer the bus */
+		snooze (100);
+	}
 
 	return B_OK;
 }