usb/gadget: Add driver for Aspeed SoC virtual hub

Quoted 5 lines · Benjamin Herrenschmidt

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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 ?