From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mark Brown <broonie@opensource.wolfsonmicro.com>
Subject: Re: wm8974 sam9g45 part #2
Date: Tue, 28 Jun 2011 20:03:07 -0700
Message-ID: <20110629030307.GB22472@opensource.wolfsonmicro.com>
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To: Michele Da Rold <michele.darold@ecsproject.com>
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On Tue, Jun 28, 2011 at 12:22:39PM +0200, Michele Da Rold wrote:

> 3. I use the default configuration of wm8974 registers, I put the
> volume to 100%, the result on headphone output is noise, only
> noise....
> Stopping playback the noise stop so I think that I'm playing a sound
> but no output!!

This sounds like your clocking configuration is bad and the CODEC isn't
parsing the data sent by the CPU.