On 17/05/17 11:15, Sekhar Nori wrote:
> Calculate wMaxPacketSize before endpoint matching the
> descriptor is found.
>
> This allows audio gadget to be used with controllers
> which have a shortage or unavailability of endpoints
> that can handle max packet size of 1023 (FS) or 1024
> (HS).
>
> With this audio gadget can be used on TI's OMAP-L138 SoC
> which has a MUSB HS controller with endpoints having max
> packet size much less than 1023 or 1024. See mode_2_cfg in
> drivers/usb/musb/musb_core.c
>
> Signed-off-by: Sekhar Nori
Acked-by: Roger Quadros
> ---
> drivers/usb/gadget/function/f_uac2.c | 12 ++--
> 1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/usb/gadget/function/f_uac2.c
> b/drivers/usb/gadget/function/f_uac2.c
> index f6a0d3a1311b..5a7ba058d947 100644
> --- a/drivers/usb/gadget/function/f_uac2.c
> +++ b/drivers/usb/gadget/function/f_uac2.c
> @@ -1065,6 +1065,12 @@ afunc_bind(struct usb_configuration *cfg, struct
> usb_function *fn)
> agdev->as_in_intf = ret;
> agdev->as_in_alt = 0;
>
> + /* Calculate wMaxPacketSize according to audio bandwidth */
> + set_ep_max_packet_size(uac2_opts, &fs_epin_desc, 1000, true);
> + set_ep_max_packet_size(uac2_opts, &fs_epout_desc, 1000, false);
> + set_ep_max_packet_size(uac2_opts, &hs_epin_desc, 8000, true);
> + set_ep_max_packet_size(uac2_opts, &hs_epout_desc, 8000, false);
> +
> agdev->out_ep = usb_ep_autoconfig(gadget, &fs_epout_desc);
> if (!agdev->out_ep) {
> dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
> @@ -1080,12 +1086,6 @@ 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, true);
> - set_ep_max_packet_size(uac2_opts, &fs_epout_desc, 1000, false);
> - set_ep_max_packet_size(uac2_opts, &hs_epin_desc, 8000, true);
> - set_ep_max_packet_size(uac2_opts, &hs_epout_desc, 8000, false);
> -
> hs_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress;
> hs_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress;
>
>
--
cheers,
-roger
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