USB: xhci: Make endpoint interval debugging clearer.
Sarah Sharp [Tue, 16 Mar 2010 19:59:24 +0000 (12:59 -0700)]
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 <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/host/xhci-mem.c

index 49f7d72..bba9b19 100644 (file)
@@ -566,8 +566,13 @@ static inline unsigned int xhci_get_endpoint_interval(struct usb_device *udev,
                        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: