usb: gadget: pxa25x_udc: use udc-core's reset notifier

Replace usb_gadget_driver's disconnect with udc-core's reset notifier at
bus reset handler.
Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/gadget/udc/pxa25x_udc.c

@@ -1283,6 +1283,33 @@ static int pxa25x_udc_start(struct usb_gadget *g,
 	return retval;
 }
 
+static void
+reset_gadget(struct pxa25x_udc *dev, struct usb_gadget_driver *driver)
+{
+	int i;
+
+	/* don't disconnect drivers more than once */
+	if (dev->gadget.speed == USB_SPEED_UNKNOWN)
+		driver = NULL;
+	dev->gadget.speed = USB_SPEED_UNKNOWN;
+
+	/* prevent new request submissions, kill any outstanding requests  */
+	for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) {
+		struct pxa25x_ep *ep = &dev->ep[i];
+
+		ep->stopped = 1;
+		nuke(ep, -ESHUTDOWN);
+	}
+	del_timer_sync(&dev->timer);
+
+	/* report reset; the driver is already quiesced */
+	if (driver)
+		usb_gadget_udc_reset(&dev->gadget, driver);
+
+	/* re-init driver-visible data structures */
+	udc_reinit(dev);
+}
+
 static void
 stop_activity(struct pxa25x_udc *dev, struct usb_gadget_driver *driver)
 {
@@ -1721,7 +1748,7 @@ pxa25x_udc_irq(int irq, void *_dev)
 				/* reset driver and endpoints,
 				 * in case that's not yet done
 				 */
-				stop_activity (dev, dev->driver);
+				reset_gadget(dev, dev->driver);
 
 			} else {
 				DBG(DBG_VERBOSE, "USB reset end\n");