USB: xhci: Make endpoint interval debugging clearer.

The xHCI hardware can only handle polling intervals that are a power of
two. When we add a new endpoint during a bandwidth allocation, and the
polling interval is rounded down to a power of two, print the original
polling interval in the endpoint descriptor.

Signed-off-by: Sarah Sharp <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/host/xhci-mem.c

···
 			if (interval < 3)
 				interval = 3;
 			if ((1 << interval) != 8*ep->desc.bInterval)
-				dev_warn(&udev->dev, "ep %#x - rounding interval to %d microframes\n",
-						ep->desc.bEndpointAddress, 1 << interval);
+				dev_warn(&udev->dev,
+						"ep %#x - rounding interval"
+						" to %d microframes, "
+						"ep desc says %d microframes\n",
+						ep->desc.bEndpointAddress,
+						1 << interval,
+						8*ep->desc.bInterval);
 		}
 		break;
 	default: