On Mon, 4 May 2020, Andrey Konovalov wrote: > On Mon, May 4, 2020 at 4:24 PM Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > > > > On Mon, 4 May 2020, Andrey Konovalov wrote: > > > > > One more question (sorry for so many :). > > > > > > Looking at other fields of usb_request struct I see frame_number. > > > AFAIU it's filled in by the UDC driver for ISO transfers. Does it make > > > sense to expose it to userspace? I don't see any composite/legacy > > > gadgets use that field at all. > > > > Do any of those gadget drivers use isochronous endpoints? > > Yes, there are audio/uvc function/legacy drivers that use those. > > > In fact, it also looks like none of the drivers in gadget/udc/ touch > > the frame_number field. Maybe we should just get rid of it, since it > > isn't being used. > > It is used by dwc2/3 gadget drivers (which are not in gadget/udc/). Well, if Felipe thinks we ought to keep the field then you might as well export it to userspace. Drivers are free to ignore it. :-) Alan Stern
