linux-kernel - Re: [PATCH] usb: gadget: f_uac2: fix superspeed transfer

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Date:   Mon, 14 Feb 2022 11:36:56 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     3090101217@....edu.cn
Cc:     balbi@...nel.org, ruslan.bilovol@...il.com,
        pavel.hofman@...tera.com, jbrunet@...libre.com,
        jackp@...eaurora.org, colin.king@...el.com, pawell@...ence.com,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jing Leng <jleng@...arella.com>
Subject: Re: [PATCH] usb: gadget: f_uac2: fix superspeed transfer

On Mon, Feb 14, 2022 at 11:26:06AM +0800, 3090101217@....edu.cn wrote:
> From: Jing Leng <jleng@...arella.com>
> 
> ss_ep_int_desc endpoint doesn't have 'SuperSpeed Endpoint
> Companion Descriptor', so we should add it.

This is not a "fix" but rather a new feature.

Why does this endpoint need this descriptor?  We need a lot more
description here please.

> 
> Signed-off-by: Jing Leng <jleng@...arella.com>
> ---
>  drivers/usb/gadget/function/f_uac2.c | 19 +++++++++++++++++--
>  1 file changed, 17 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/gadget/function/f_uac2.c b/drivers/usb/gadget/function/f_uac2.c
> index 097a709549d6..a6fc492f9148 100644
> --- a/drivers/usb/gadget/function/f_uac2.c
> +++ b/drivers/usb/gadget/function/f_uac2.c
> @@ -282,6 +282,14 @@ static struct usb_endpoint_descriptor ss_ep_int_desc = {
>  	.bInterval = 4,
>  };
>  
> +static struct usb_ss_ep_comp_descriptor ss_ep_int_desc_comp = {
> +	.bLength = sizeof(ss_ep_int_desc_comp),
> +	.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
> +	.bMaxBurst = 0,
> +	.bmAttributes = 0,

0 is the default value if it is not defined.

thanks,

greg k-h