linux-kernel - Re: [PATCH v2 1/5] USB: gadget: f_rndis: fix bitrate for SuperSpeed and above

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Date:   Tue, 1 Dec 2020 16:48:17 +0800
From:   Peter Chen <hzpeterchen@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     balbi@...nel.org, peter.chen@....com, willmcvicker@...gle.com,
        USB list <linux-usb@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>, EJ Hsu <ejh@...dia.com>,
        stable <stable@...r.kernel.org>
Subject: Re: [PATCH v2 1/5] USB: gadget: f_rndis: fix bitrate for SuperSpeed
 and above

>
> From: Will McVicker <willmcvicker@...gle.com>
>

Reviewed-by: Peter Chen <peter.chen@....com>

Peter
> Align the SuperSpeed Plus bitrate for f_rndis to match f_ncm's ncm_bitrate
> defined by commit 1650113888fe ("usb: gadget: f_ncm: add SuperSpeed descriptors
> for CDC NCM").
>
> Cc: Felipe Balbi <balbi@...nel.org>
> Cc: EJ Hsu <ejh@...dia.com>
> Cc: Peter Chen <peter.chen@....com>
> Cc: stable <stable@...r.kernel.org>
> Signed-off-by: Will McVicker <willmcvicker@...gle.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
>  drivers/usb/gadget/function/f_rndis.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/usb/gadget/function/f_rndis.c b/drivers/usb/gadget/function/f_rndis.c
> index 9534c8ab62a8..0739b05a0ef7 100644
> --- a/drivers/usb/gadget/function/f_rndis.c
> +++ b/drivers/usb/gadget/function/f_rndis.c
> @@ -87,8 +87,10 @@ static inline struct f_rndis *func_to_rndis(struct usb_function *f)
>  /* peak (theoretical) bulk transfer rate in bits-per-second */
>  static unsigned int bitrate(struct usb_gadget *g)
>  {
> +       if (gadget_is_superspeed(g) && g->speed >= USB_SPEED_SUPER_PLUS)
> +               return 4250000000U;
>         if (gadget_is_superspeed(g) && g->speed == USB_SPEED_SUPER)
> -               return 13 * 1024 * 8 * 1000 * 8;
> +               return 3750000000U;
>         else if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
>                 return 13 * 512 * 8 * 1000 * 8;
>         else
> --
> 2.29.2
>