On Sun, 22 Apr 2007, Hamish Moffatt wrote:
> > Now I'm getting confused. Your driver runs on the device and usbtest
> > runs on the host. How can the host get confused about the device's speed,
> > and what could your driver possibly do to confuse it?
>
> I don't know? All I know is that usbtest.c reports that the device speed
> is unknown, in the probe routine. This shows up as follows when I run
> the testusb program;
>
> unknown speed /proc/bus/usb/002/013
That line is printed by testusb, not by usbtest. In fact, if you look at
the source code for testusb, in the find_testdev() routine you'll see a
comment:
// FIXME ask usbfs what speed; update USBDEVFS_CONNECTINFO
// so it tells about high speed etc
The program prints out "unknown" because it doesn't try to find out what
the speed actually is.
> /proc/bus/usb/002/013 test 0, 0.000003 secs
> /proc/bus/usb/002/013 test 1, 0.002860 secs
> [...]
>
> > Furthermore, there's no way for usbcore on the host to leave the speed set
> > to UNKNOWN. Look at the code in hub_port_wait_reset() in
> > drivers/usb/core/hub.c.
>
> It's only usbtest that's reporting unknown speed. Other messages from
> the kernel seem to be as expected. Here's what I get on the host with
> CONFIG_USB_DEBUG;
> Apr 21 17:15:19 snake kernel: usbtest 2-3:3.0: Linux gadget zero
> Apr 21 17:15:19 snake kernel: usbtest 2-3:3.0: full speed {control in/out
> bulk-in bulk-out} tests (+alt)
That last line _is_ printed by usbtest, as you can easily see. It doesn't
look confused in any way, and it reports the correct speed.
Alan Stern
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