Hi Simon,
While working on moving the sunxi ehci code over to the driver model I've found this bug in the usb uclass which causes a div by zero error.
I've spend a couple of hours yesterday evening debugging this and I'm happy to report that I've a fix now. This fix has not seen as much testing as I would have liked, but I believe it is correct and want to share it now anyways to avoid people doing double work.
While thinking more about this I've come up with what I believe is a better way to deal with this all together. I'll send that out right after this one, note that the intend is that only one of the 2 patches gets applied, preferably the latter as I believe that one is the best.
Regards,
Hans
p.s.
I've found 2 other issues with the dm usb code:
1) usb-1 devices / hubs behind a usb-2 (root)hub do not seem to work, this is a familiar issue which I fixed in the pre dm usb code a while back. I'll investigate this one myself.
2) "usb reset" is buggered, it either hangs or reboots the system. I would appreciate if you could take a look (assuming you can reproduce it).