linux-kernel - Re: [PATCH] usb: gadget: composite: fill bcdUSB as 0x0320 for SuperSpeed or higher speeds

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Date:   Thu, 10 May 2018 08:03:06 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Felipe Balbi <felipe.balbi@...ux.intel.com>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <linux-usb@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH] usb: gadget: composite: fill bcdUSB as 0x0320 for
 SuperSpeed or higher speeds

Hi,

On Wed, 2018-05-09 at 14:33 +0300, Felipe Balbi wrote:
> Hi,
> 
> Chunfeng Yun <chunfeng.yun@...iatek.com> writes:
> > The USB3CV version 2.1.80 (March 26, 2018) requires all devices
> > ( gen1, gen2, single lane, dual lane) to return the value of 0x0320
> > in the bcdUSB field
> 
> this sounds really odd. What happens when I get a USB 3.1 compliant
> device off-the-shelf and run it through USB3CV? will it fail now?
It will fail, the last version require it 0x0310
> 
> Care to share a screenshot or the raw html of the test result?
A screenshot is attached
> 


Download attachment "dev_desc_test_fail.png" of type "image/png" (16866 bytes)