>
> > @@ -1176,15 +1188,16 @@ afunc_set_alt(struct usb_function *fn, unsigned
> intf, unsigned alt)
> > factor = 1000;
> > } else {
> > ep_desc = &hs_epin_desc;
> > - factor = 125;
> > + factor = 8000;
> > }
> >
> > /* pre-compute some values for iso_complete() */
> > uac2->p_framesize = opts->p_ssize *
> > num_channels(opts->p_chmask);
> > rate = opts->p_srate * uac2->p_framesize;
> > - uac2->p_interval = (1 << (ep_desc->bInterval - 1)) * factor;
> > - uac2->p_pktsize = min_t(unsigned int, rate / uac2->p_interval,
> > + uac2->p_interval = factor / (1 << (ep_desc->bInterval
> > + - 1));
>
> Your version is correct. b_interval needs to get larger when bInterval decreases
> of course.
>
> > + uac2->p_pktsize = min_t(unsigned int, DIV_ROUND_UP(rate,
> > + uac2->p_interval),
> > prm->max_psize);
>
> This change, however, is not needed. uac2->p_pktsize needs to be rounded
> down, so an extra frame can be added when the residue accumulator
> overflows. The reason is simply that we can only send packets that contain full
> sample frames, so we have to evenly distribute those left-over samples that
> accumulate in one go once we have enough to fill a complete frame.
>
> Could you put the above change in an extra patch, as it's not directly related to
> your wMaxPacketSize change?
>
Ok, I will.
Peter
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