From owner-freebsd-arm@FreeBSD.ORG  Mon May  5 11:56:54 2014
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Date: Mon, 05 May 2014 13:57:44 +0200
From: Hans Petter Selasky <hps@selasky.org>
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To: Johny Mattsson <johny.mattsson+fbsd@gmail.com>, 
 freebsd-arm@freebsd.org
Subject: USB isochronous traffic with Rasberry Pi [WAS: Re: USB audio device
 on Raspberry Pi]
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Hi,

To get USB isochronous traffic working with the DWC OTG you need this patch:

http://svnweb.freebsd.org/changeset/base/265358

BTW: I see that every second or so there is a glitch. I suspect this is 
because someone in the kernel is calling DELAY(). Is there an easy way 
to figure out who is blocking the DWC OTG interrupt routine from executing?

I was thinking about adding something like:

if (!cold)
	printf("Using delay\n");

To the DELAY() function to figure out the caller.

--HPS