linux-kernel - Re: [PATCH v4] usb: gadget: f_uac2: fix superspeed transfer

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Date:   Wed, 20 Jul 2022 17:26:59 -0700
From:   Jack Pham <quic_jackp@...cinc.com>
To:     <3090101217@....edu.cn>
CC:     <gregkh@...uxfoundation.org>, <balbi@...nel.org>,
        <colin.king@...el.com>, <jbrunet@...libre.com>,
        <jleng@...arella.com>, <pavel.hofman@...tera.com>,
        <pawell@...ence.com>, <ruslan.bilovol@...il.com>,
        <linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>
Subject: Re: [PATCH v4] usb: gadget: f_uac2: fix superspeed transfer

Hi Greg,

On Fri, Feb 18, 2022 at 05:59:48PM +0800, 3090101217@....edu.cn wrote:
> From: Jing Leng <jleng@...arella.com>
> 
> On page 362 of the USB3.2 specification (
> https://usb.org/sites/default/files/usb_32_20210125.zip),
> The 'SuperSpeed Endpoint Companion Descriptor' shall only be returned
> by Enhanced SuperSpeed devices that are operating at Gen X speed.
> Each endpoint described in an interface is followed by a 'SuperSpeed
> Endpoint Companion Descriptor'.
> 
> If users use SuperSpeed UDC, host can't recognize the device if endpoint
> doesn't have 'SuperSpeed Endpoint Companion Descriptor' followed.
> 
> Currently in the uac2 driver code:
> 1. ss_epout_desc_comp follows ss_epout_desc;
> 2. ss_epin_fback_desc_comp follows ss_epin_fback_desc;
> 3. ss_epin_desc_comp follows ss_epin_desc;
> 4. Only ss_ep_int_desc endpoint doesn't have 'SuperSpeed Endpoint
> Companion Descriptor' followed, so we should add it.
> 
> Fixes: eaf6cbe09920 ("usb: gadget: f_uac2: add volume and mute support")
> Signed-off-by: Jing Leng <jleng@...arella.com>
> ---
> ChangeLog v3->v4:
> - Add "Fixes:" tag in the changelog area
> ChangeLog v2->v3:
> - Remove static variables which are explicitly initialized to 0
> - Remove redundant modification "case USB_SPEED_SUPER_PLUS:"
> ChangeLog v1->v2:
> - Update more detailed description of the PATCH

I don't see this patch in any of your trees, so I'm assuming it must not
have made it into your inbox.  If that's the case I would like to
resubmit on Jing's behalf as it does fix a legitimate issue with
enabling the UAC2 gadget in SuperSpeed.

Jack