On Mon, 11 Aug 2014, Felipe Balbi wrote:

> > > I don't know what exactly problem you met, but current pullup dp during 
> > > loading
> > > gadget driver behavior is not suitable for webcam and android use case 
> > > even vbus
> > > is there.
> > 
> > Why not?  What's wrong with it?
> 
> g_uvc needs a userspace counterpart. If we connect to the host before
> userspace is ready, we might connect as a non-usable function.

Okay, but can't that be fixed in g_uvc?  Have it disable the pullup 
until the userspace component is ready, then enable the pullup.

I'm not sure how this could be made to work in a composite gadget,
though.  What if there were two uvc functions?  The pullup would have
to remain disabled until both userspace components were ready.

Alan Stern

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