[v4,2/2] usb/gadget: Add driver for Aspeed SoC virtual hub

[Benjamin Herrenschmidt <benh@kernel.crashing.org>]

On Thu, 2018-03-15 at 08:03 +1100, Benjamin Herrenschmidt wrote:
> > > Do you have more comments for the rest of the driver or that's it ?
> > 
> > so far, that's it.
> 
> Ok. I'll re-send.

So I'll resend in a minute, doing a few more tests, however, I've
noticed something which I wont' have time to track down til at
best next week, I wonder if it's normal/expected.

If I just create a mass storage function set to be "removable" and
"cdrom" with no file attached,  and enable it, I get an endless stream
of resets. It looks like the host constantly does USB resets.

I suspect the host is sending SCSI commands that fail and resets
as a result, but that's spamming both logs and is rather ... sub
optimal.

Do we know what's going on ? Is this just TEST_UNIT_READY or some other
media check ? Or are we missing some commands we should actually
implement in the mass storage gadget ?

Cheers,
Ben.
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