On Wed, Aug 27, 2014 at 3:23 AM, Daniel Mack <[email protected]> wrote:
> @@ -1099,11 +1139,31 @@ afunc_set_alt(struct usb_function *fn, unsigned intf,
> unsigned alt)
> prm = &uac2->c_prm;
> config_ep_by_speed(gadget, fn, ep);
> agdev->as_out_alt = alt;
> + req_len = prm->max_psize;
> } else if (intf == agdev->as_in_intf) {
> + struct f_uac2_opts *opts = agdev_to_uac2_opts(agdev);
> + unsigned int rate = opts->p_srate * opts->p_ssize *
> + num_channels(opts->p_chmask);
> + struct usb_endpoint_descriptor *ep_desc;
> + unsigned int factor;
> +
> ep = agdev->in_ep;
> prm = &uac2->p_prm;
> config_ep_by_speed(gadget, fn, ep);
> agdev->as_in_alt = alt;
> +
> + /* pre-calculate the playback endpoint's interval */
> + if (gadget->speed == USB_SPEED_FULL) {
> + ep_desc = &fs_epin_desc;
> + factor = 1000;
> + } else {
> + ep_desc = &hs_epin_desc;
> + factor = 125;
> + }
> +
> + uac2->p_interval = (1 << (ep_desc->bInterval - 1)) * factor;
> + req_len = rate / uac2->p_interval;
>
(a) For 44.1/2/S16, req_len = 176
> + uac2->p_residue = 0;
> } else {
> dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
> return -EINVAL;
> @@ -1128,7 +1188,7 @@ afunc_set_alt(struct usb_function *fn, unsigned intf,
> unsigned alt)
>
> req->zero = 0;
> req->context = &prm->ureq[i];
> - req->length = prm->max_psize;
> + req->length = req_len;
(b) req->length = req_len or 176
> req->complete = agdev_iso_complete;
> req->buf = prm->rbuf + i * req->length;
>
Here req[0]->buf is req->length, which is 176 bytes from (b).
I hope this makes it clear.
-jassi
> }
> --
> 2.1.0
>
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