On 07/27/2015 08:51 AM, Peter Chen wrote:
> The p_interval should be less if the 'bInterval' at the descriptor
> is larger, eg, if 'bInterval' is 5 for HS, the p_interval should be
> 8000 / 16 = 500.
>
> It fixes the patch 9bb87f16 "usb: gadget: f_uac2: send reasonably
> sized packets"
>
Acked-by: Daniel Mack <zonque@xxxxxxxxx>
Thanks for spotting this!
Daniel
> Cc: Daniel Mack <zonque@xxxxxxxxx>
> Cc: <stable@xxxxxxxxxxxxxxx> #v3.18+
> Signed-off-by: Peter Chen <peter.chen@xxxxxxxxxxxxx>
> ---
> drivers/usb/gadget/function/f_uac2.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/usb/gadget/function/f_uac2.c b/drivers/usb/gadget/function/f_uac2.c
> index 51ca32d..4bd9a8e 100644
> --- a/drivers/usb/gadget/function/f_uac2.c
> +++ b/drivers/usb/gadget/function/f_uac2.c
> @@ -1191,14 +1191,14 @@ 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_interval = factor / (1 << (ep_desc->bInterval - 1));
> uac2->p_pktsize = min_t(unsigned int, rate / uac2->p_interval,
> prm->max_psize);
>
>
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