musb_hdrc: Make vbus sysfs entry report current Vbus status

Getting the current status of Vbus is useful when running
USB Compliance Tests.
Signed-off-by: Felipe Balbi <felipe.lima@indt.org.br>
Signed-off-by: Tony Lindgren <tony@atomide.com>

drivers/usb/musb/musb_core.c

@@ -1718,12 +1718,15 @@ musb_vbus_show(struct device *dev, struct device_attribute *attr, char *buf)
 	struct musb	*musb = dev_to_musb(dev);
 	unsigned long	flags;
 	unsigned long	val;
+	int		vbus;
 
 	spin_lock_irqsave(&musb->lock, flags);
 	val = musb->a_wait_bcon;
+	vbus = musb_platform_get_vbus_status(musb);
 	spin_unlock_irqrestore(&musb->lock, flags);
 
-	return sprintf(buf, "%lu\n", val);
+	return sprintf(buf, "Vbus %s, timeout %lu\n",
+			vbus ? "on" : "off", val);
 }
 static DEVICE_ATTR(vbus, 0644, musb_vbus_show, musb_vbus_store);