Re: [PATCH v3 4/9] usb: gadget: f_midi: defaults buflen sizes to 512

From: Michal Nazarewicz
Date: Sat Aug 06 2016 - 17:07:53 EST


On Fri, Aug 05 2016, Felipe F. Tonello wrote:
> 512 is the value used by wMaxPacketSize, as specified by the USB Spec. This
> makes sure this driver uses, by default, the most optimal value for IN and OUT
> endpoint requests.
>
> Signed-off-by: Felipe F. Tonello <eu@xxxxxxxxxxxxxxxxx>

Acked-by: Michal Nazarewicz <mina86@xxxxxxxxxx>

> ---
> drivers/usb/gadget/function/f_midi.c | 2 +-
> drivers/usb/gadget/legacy/gmidi.c | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/usb/gadget/function/f_midi.c b/drivers/usb/gadget/function/f_midi.c
> index 39018dea7035..a7b50ac947f8 100644
> --- a/drivers/usb/gadget/function/f_midi.c
> +++ b/drivers/usb/gadget/function/f_midi.c
> @@ -1122,7 +1122,7 @@ static struct usb_function_instance *f_midi_alloc_inst(void)
> opts->func_inst.free_func_inst = f_midi_free_inst;
> opts->index = SNDRV_DEFAULT_IDX1;
> opts->id = SNDRV_DEFAULT_STR1;
> - opts->buflen = 256;
> + opts->buflen = 512;
> opts->qlen = 32;
> opts->in_ports = 1;
> opts->out_ports = 1;
> diff --git a/drivers/usb/gadget/legacy/gmidi.c b/drivers/usb/gadget/legacy/gmidi.c
> index fc2ac150f5ff..0bf39c3ccdb1 100644
> --- a/drivers/usb/gadget/legacy/gmidi.c
> +++ b/drivers/usb/gadget/legacy/gmidi.c
> @@ -47,7 +47,7 @@ static char *id = SNDRV_DEFAULT_STR1;
> module_param(id, charp, S_IRUGO);
> MODULE_PARM_DESC(id, "ID string for the USB MIDI Gadget adapter.");
>
> -static unsigned int buflen = 256;
> +static unsigned int buflen = 512;
> module_param(buflen, uint, S_IRUGO);
> MODULE_PARM_DESC(buflen, "MIDI buffer length");
>
> --
> 2.9.0
>

--
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