linux-kernel - Re: [PATCH v2 3/3] usb: dwc3: gadget: return error if command sent to DEPCMD register fails

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Date:	Mon, 29 Jun 2015 16:47:01 -0500
From:	Felipe Balbi <balbi@...com>
To:	Subbaraya Sundeep Bhatta <subbaraya.sundeep.bhatta@...inx.com>
CC:	<balbi@...com>, <gregkh@...uxfoundation.org>,
	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<stable@...r.kernel.org>,
	Subbaraya Sundeep Bhatta <sbhatta@...inx.com>
Subject: Re: [PATCH v2 3/3] usb: dwc3: gadget: return error if command sent
 to DEPCMD register fails

Hi,

On Thu, May 21, 2015 at 03:46:48PM +0530, Subbaraya Sundeep Bhatta wrote:
> We need to return error to caller if command is not sent to
> controller succesfully.
> 
> Signed-off-by: Subbaraya Sundeep Bhatta <sbhatta@...inx.com>
> Fixes: 72246da40f37 (usb: Introduce DesignWare USB3 DRD Driver)
> Cc: <stable@...r.kernel.org>
> ---
> v2 changes:
> 	Added Fixes and Cc in commit message.

I noticed that this breaks at least my AM437x silicon with DWC3 2.40a
when used with g_zero and testusb. As of now, it could be that silicon
is mis-behaving because I got a Transfer Complete before the failing Set
Endpoint Transfer Resource command.

In any case, can you run on your setup with g_zero and test.sh/testusb
[1]/[2] just to verify that it really works for you ?

Meanwhile, I'll continue testing on my end.

cheers

[1] https://gitorious.org/usb/usb-tools/source/47ef073d9b6c0eae816204c81374aafb795c6e40:testusb.c
[2] https://gitorious.org/usb/usb-tools/source/47ef073d9b6c0eae816204c81374aafb795c6e40:test.sh

-- 
balbi

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