linux-kernel - Re: [PATCH] usb: gadget: zero: Fix SuperSpeed enumeration for alternate setting 1

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Message-ID: <5332E759.20007@ti.com>
Date:	Wed, 26 Mar 2014 16:42:33 +0200
From:	Roger Quadros <rogerq@...com>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	<balbi@...com>
CC:	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	"3.9+" <stable@...r.kernel.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: Re: [PATCH] usb: gadget: zero: Fix SuperSpeed enumeration for alternate
 setting 1

On 03/26/2014 03:06 PM, Sergei Shtylyov wrote:
> Hello.
> 
> On 26-03-2014 13:28, Roger Quadros wrote:
> 
>> It was impossible to enumerate on a SuperSpeed (XHCI) host
>> with alternate setting = 1 due to the wrongly set 'bMaxBurst'
>> field in the SuperSpeed Endpoint Companion descriptor.
> 
>> Testcase:
>> <host> modprobe -r usbtest; modprobe usbtest alt=1
>> <device> modprobe g_zero
>> plug device to SuperSpeed port on the host.
> 
>> Without this patch the host always complains like so
>> "usb 12-2: Not enough bandwidth for new device state.
>>   usb 12-2: Not enough bandwidth for altsetting 1"
> 
>> Bug was introduced by commit cf9a08ae in v3.9
> 
>    Please also specify that commit's summary in parens. Also, there's now an adopted standard way of saying this:
> 
> Fixes: <12-digit SHA ID> ("<summary line>")
> 
Right. will send a v2. Thanks.

cheers,
-roger
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