linux-kernel - Re: Problem with dwc2 gadget isochronous in transfers

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Date:	Thu, 24 Mar 2016 10:48:46 -0700
From:	John Youn <John.Youn@...opsys.com>
To:	John Keeping <john@...anate.com>,
	John Youn <John.Youn@...opsys.com>
CC:	Roman Bacik <rbacik@...adcom.com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Problem with dwc2 gadget isochronous in transfers

On 3/24/2016 4:32 AM, John Keeping wrote:
> Hi,
> 
> I've been trying to use the uac2 gadget function on a Radxa Rock2 board
> which uses the dwc2 driver, but it seems there is a problem with
> isochronous in endpoints (out works fine).
> 
> When trying to use the audio gadget no data is transferred and the other
> end of the link ends up timing out.  With debug logging enabled in dwc2
> the GINTSTS_INCOMPL_SOIN interrupt triggers continuously, as seen in the
> log below (from which I snipped 6,000+ more occurences).  I'm guessing
> the root cause of this relates to the line:
> 
>     [  320.656450] dwc2 ff580000.usb: dwc2_hsotg_epint: EPDisbld
> 
> during the setup phase, but I have no idea why that's happening.
> 


Hi John,

We have a patch series that fixes up the ISOC code and which possibly
addresses the failures here. We hope to submit them for review within
the next week or so.

Appreciate if you would test and report any problems based off of
those patches.

Regards,
John