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

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Date:	Wed, 26 Mar 2014 17:06:16 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Roger Quadros <rogerq@...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

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>")

> Cc: 3.9+ <stable@...r.kernel.org> # 3.9+
> Cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> Reviewed-by: Felipe Balbi <balbi@...com>
> Signed-off-by: Roger Quadros <rogerq@...com>

WBR, Sergei


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