? sys/external/bsd/dwc2/cscope.out
Index: sys/external/bsd/dwc2/dwc2.c
===================================================================
RCS file: /cvsroot/src/sys/external/bsd/dwc2/dwc2.c,v
retrieving revision 1.15
diff -u -p -r1.15 dwc2.c
--- sys/external/bsd/dwc2/dwc2.c	22 Oct 2013 09:42:20 -0000	1.15
+++ sys/external/bsd/dwc2/dwc2.c	22 Oct 2013 13:02:57 -0000
@@ -1328,13 +1328,40 @@ dwc2_device_start(usbd_xfer_handle xfer)
 	dwc2_urb->status = -EINPROGRESS;
 	dwc2_urb->packet_count = xfer->nframes;
 
-	if (xfertype == UE_INTERRUPT) {
-		if (dpipe->pipe.interval == USBD_DEFAULT_INTERVAL)
-			dwc2_urb->interval = ed->bInterval;
+	if (xfertype == UE_INTERRUPT ||
+	    xfertype == UE_ISOCHRONOUS) {
+		uint16_t ival;
+
+		if (xfertype == UE_ISOCHRONOUS || 
+		    dpipe->pipe.interval == USBD_DEFAULT_INTERVAL)
+			ival = ed->bInterval;
 		else
-			dwc2_urb->interval = dpipe->pipe.interval;
-	} else if (xfertype == UE_ISOCHRONOUS)
-		dwc2_urb->interval = ed->bInterval;
+			ival = dpipe->pipe.interval;
+
+		if (ival < 1) {
+			retval = -ENODEV;
+			goto fail;
+		}
+		switch (dev->speed) {
+		case USB_SPEED_HIGH:
+			if (ival > 16) {
+				/*
+				 * illegal with high-speed, but there
+				 * were documentation bugs in the spec,
+				 * so be generous
+				 */
+				ival = 256;
+			} else
+				ival = (1 << (ival - 1));
+			break;
+
+		case USB_SPEED_LOW:
+			if (xfertype == UE_INTERRUPT && ival < 10)
+				ival = 10;
+			break;
+		}
+		dwc2_urb->interval = ival;
+	}
 
 	/* XXXNH bring down from callers?? */
 // 	mutex_enter(&sc->sc_lock);