Comment # 22 on bug 1167675 from Stefan Br���ns

I have just submitted the patch for interrupt out endpoints upstream. This
should fix the issue of Linux gadget keyboard being rejected (which does affect
any DUT which uses u-boot, not only RPIs).

With this accepted, you should be able to use and Rpi3 as KVM (Linux gadget
keyboard) and e.g. a Pine64 as DUT (which uses interrupts for transfers) or
maybe an Rpi4 (which has as XHCI controller and not the awkward DWC2).


@lnussel:
For the missing/incomplete support of the SetIdle request by the gadget
support, I think you can/have to implement that in userspace. Taking the code
from https://www.kernel.org/doc/Documentation/usb/gadget_hid.txt , just add a
500ms timeout to the select() loop and send the last report again.