On Wed, Nov 23, 2011 at 08:20:54AM +0000, Li Yang-R58472 wrote: > >Leo, I have debugged this issue at my board just now, the reason of > >failure is we only have one ep struct for ep0, so when talking about ep0, > >it always pointers to udc->ep[0]. So even we initialize the current qh > >address for ep0in at probe, it still can't get the ep0in's qh address > >through ep structure, as ep0 is always udc->ep[0]. > > Oops. I forgot the fact that we used a single ep structure to handle > both IN and OUT ep0 because the gadget layer only knows about one ep0 > structure.
the gadget framework knows about USB endpoints which are bidirectional logical entities. One USB endpoint is composed of two unidirectional HW endpoints. > I guess currently we have no other way out unless the gadget layer do > honor ep0 with direction. IMHO, it is a limitation to current gadget > APIs that each udc driver need to take too much care of the protocol > related stuff on ep0. indeed, if you can come up with a sensible patch we're here to review ;-) -- balbi
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