On 07/28/2015 03:38 AM, Peter Chen wrote:
> diff --git a/drivers/usb/gadget/function/f_uac2.c
> b/drivers/usb/gadget/function/f_uac2.c
> index 5318615..6a8e0d2 100644
> --- a/drivers/usb/gadget/function/f_uac2.c
> +++ b/drivers/usb/gadget/function/f_uac2.c
> @@ -975,6 +975,31 @@ free_ep(struct uac2_rtd_params *prm, struct usb_ep *ep)
> "%s:%d Error!\n", __func__, __LINE__);
> }
>
> +static void set_ep_max_packet_size (struct f_uac2_opts *uac2_opts,
> + struct usb_endpoint_descriptor *ep_desc, unsigned int factor)
scripts/checkpatch.pl will complain about a stray space before '(' and
wrong indentation. Also, uac2_opts can be const.
> +{
> + int chmask;
> + int srate;
> + int ssize;
These can be put in one line.
> + u16 max_packet_size;
> +
> + if (ep_desc == &fs_epin_desc || ep_desc == &hs_epin_desc) {
> + chmask = uac2_opts->p_chmask;
> + srate = uac2_opts->p_srate;
> + ssize = uac2_opts->p_ssize;
> + } else {
> + WARN_ON (ep_desc != &fs_epout_desc && ep_desc !=
> &hs_epout_desc);
I would rather pass a boolean flag called 'is_playback' than checking
the input parameter like this. But I forgot this detail in my proposal,
I admit.
Apart from that, I like the patch.
Thanks,
Daniel
> + chmask = uac2_opts->c_chmask;
> + srate = uac2_opts->c_srate;
> + ssize = uac2_opts->c_ssize;
> + }
> +
> + max_packet_size = num_channels(chmask) * ssize *
> + DIV_ROUND_UP(srate, factor / (1 << (ep_desc->bInterval - 1)));
> + ep_desc->wMaxPacketSize = min(cpu_to_le16(max_packet_size),
> + ep_desc->wMaxPacketSize);
> +}
> +
> static int
> afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
> {
> @@ -1070,10 +1095,14 @@ afunc_bind(struct usb_configuration *cfg, struct
> usb_function *fn)
> uac2->p_prm.uac2 = uac2;
> uac2->c_prm.uac2 = uac2;
>
> + /* Calculate wMaxPacketSize according to audio bandwidth */
> + set_ep_max_packet_size(uac2_opts, &fs_epin_desc, 1000);
> + set_ep_max_packet_size(uac2_opts, &fs_epout_desc, 1000);
> + set_ep_max_packet_size(uac2_opts, &hs_epin_desc, 8000);
> + set_ep_max_packet_size(uac2_opts, &hs_epout_desc, 8000);
> +
> hs_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress;
> - hs_epout_desc.wMaxPacketSize = fs_epout_desc.wMaxPacketSize;
> hs_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress;
> - hs_epin_desc.wMaxPacketSize = fs_epin_desc.wMaxPacketSize;
>
> ret = usb_assign_descriptors(fn, fs_audio_desc, hs_audio_desc, NULL);
> if (ret)
>
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