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, 13 Jul 2015 17:50:49 +0000
From:	John Youn <John.Youn@...opsys.com>
To:	"balbi@...com" <balbi@...com>,
	Subbaraya Sundeep Bhatta <subbaraya.sundeep.bhatta@...inx.com>
CC:	John Youn <John.Youn@...opsys.com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH v2 3/3] usb: dwc3: gadget: return error if command sent
 to DEPCMD register fails

On 7/11/2015 12:29 PM, Felipe Balbi wrote:
> Hi,
> 
> On Sat, Jul 11, 2015 at 05:17:32PM +0000, Subbaraya Sundeep Bhatta wrote:
>>>>>> Hi Felipe,
>>>>>>
>>>>>> Just an update on this.
>>>>>>
>>>>>> I'm trying to get this working with our latest IP with dwc3 from
>>>>>> your testing/next branch. It fails the usbtest with a problem
>>>>>> unrelated to this patch.
>>>>>> .
>>>>>> It passes on 4.1.1.
>>>>>>
>>>>>> I'll have to look into the failure but I won't get to it until next
>>>>>> week as I'm off the rest of this week.
>>>>>
>>>>> interesting... If you could post failure signature, I can help
>>>>> looking at it, but I guess it's too late to ask :-)
>>>>>
>>>>> thanks for helping though
>>>>>
>>>>
>>>>
>>>> Hi Felipe,
>>>>
>>>> Nevermind about my issue, it ended up being a setup-related problem.
>>>>
>>>> I actually do see the same error as you due to this series of patches.
>>>> Except I see it happening before even the first iteration. I get a
>>>> completion status of 1 for the Set Endpoint Transfer Resources
>>>> command. I'm not sure why this is.
>>>>
>>>> I don't see any conflict with any previous Transfer Complete.
>>
>> Same behavior at my end too. Fails before first iteration and I get
>> completion status of 1 for Set Endpoint Resource command. Attached the
>> logs of testing done with this patch and without this patch.
>> Without this patch I often see completion status of 1 for Set Endpoint
>> Transfer Resources command for Bulk and Isoc endpoints but test
>> proceeds because driver just logs command completion status and moves
>> on. We can revert this patch for time being. IP version is 2.90a.
> 
> yeah, that's what I mean, it really seems like it's the IP misbehaving.
> 
> John, let's try to figure out what's the root cause of this, we really
> want to use command completion status at some point, but for now we need
> to revert the patch :-(
> 
> Let me know if you want me to log STARS ticket on your solvnet system.
> 
> cheers
> 

Hi Felipe,

We found the issue last week. 

The start config command isn't getting called during SET_INTERFACE. Thus the transfer resource index isn't getting reset, and with multiple SET_INTERFACE commands it will eventually exhaust the resources.

I tried out a fix and it works for me. I'll send it out separately for review.

Also, I noticed that the trace message that shows control transfers doesn't show the SET_INTERFACE properly. Any idea why this is?

For example, here is the line in the trace that corresponds to the SET_INTERFACE:
irq/33-dwc3-10808 [003] d...  2443.494368: dwc3_ctrl_req: bRequestType 01 bRequest 0b wValue 0001 wIndex 0000 wLength 0

John

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