2 files changed, 8 insertions, 48 deletions

diff --git a/drivers/usb/core/devices.c b/drivers/usb/core/devices.c
index 1ef2de6e375a..d8b0041de612 100644
--- a/drivers/usb/core/devices.c
+++ b/drivers/usb/core/devices.c
@@ -157,38 +157,25 @@ static char *usb_dump_endpoint_descriptor(int speed, char *start, char *end,
 	switch (usb_endpoint_type(desc)) {
 	case USB_ENDPOINT_XFER_CONTROL:
 		type = "Ctrl";
-		if (speed == USB_SPEED_HIGH)	/* uframes per NAK */
-			interval = desc->bInterval;
-		else
-			interval = 0;
 		dir = 'B';			/* ctrl is bidirectional */
 		break;
 	case USB_ENDPOINT_XFER_ISOC:
 		type = "Isoc";
-		interval = 1 << (desc->bInterval - 1);
 		break;
 	case USB_ENDPOINT_XFER_BULK:
 		type = "Bulk";
-		if (speed == USB_SPEED_HIGH && dir == 'O') /* uframes per NAK */
-			interval = desc->bInterval;
-		else
-			interval = 0;
 		break;
 	case USB_ENDPOINT_XFER_INT:
 		type = "Int.";
-		if (speed == USB_SPEED_HIGH || speed >= USB_SPEED_SUPER)
-			interval = 1 << (desc->bInterval - 1);
-		else
-			interval = desc->bInterval;
 		break;
 	default:	/* "can't happen" */
 		return start;
 	}
-	interval *= (speed == USB_SPEED_HIGH ||
-		     speed >= USB_SPEED_SUPER) ? 125 : 1000;
-	if (interval % 1000)
+
+	interval = usb_decode_interval(desc, speed);
+	if (interval % 1000) {
 		unit = 'u';
-	else {
+	} else {
 		unit = 'm';
 		interval /= 1000;
 	}
diff --git a/drivers/usb/core/endpoint.c b/drivers/usb/core/endpoint.c
index 903426b6d305..a2530811cf7d 100644
--- a/drivers/usb/core/endpoint.c
+++ b/drivers/usb/core/endpoint.c
@@ -84,40 +84,13 @@ static ssize_t interval_show(struct device *dev, struct device_attribute *attr,
 			     char *buf)
 {
 	struct ep_device *ep = to_ep_device(dev);
+	unsigned int interval;
 	char unit;
-	unsigned interval = 0;
-	unsigned in;
 
-	in = (ep->desc->bEndpointAddress & USB_DIR_IN);
-
-	switch (usb_endpoint_type(ep->desc)) {
-	case USB_ENDPOINT_XFER_CONTROL:
-		if (ep->udev->speed == USB_SPEED_HIGH)
-			/* uframes per NAK */
-			interval = ep->desc->bInterval;
-		break;
-
-	case USB_ENDPOINT_XFER_ISOC:
-		interval = 1 << (ep->desc->bInterval - 1);
-		break;
-
-	case USB_ENDPOINT_XFER_BULK:
-		if (ep->udev->speed == USB_SPEED_HIGH && !in)
-			/* uframes per NAK */
-			interval = ep->desc->bInterval;
-		break;
-
-	case USB_ENDPOINT_XFER_INT:
-		if (ep->udev->speed == USB_SPEED_HIGH)
-			interval = 1 << (ep->desc->bInterval - 1);
-		else
-			interval = ep->desc->bInterval;
-		break;
-	}
-	interval *= (ep->udev->speed == USB_SPEED_HIGH) ? 125 : 1000;
-	if (interval % 1000)
+	interval = usb_decode_interval(ep->desc, ep->udev->speed);
+	if (interval % 1000) {
 		unit = 'u';
-	else {
+	} else {
 		unit = 'm';
 		interval /= 1000;
 	}