linux-kernel - Re: [alsa-devel] [PATCH v7 2/3] ASoC: da7210: Add support for line out and DAC

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Message-ID: <20111021090054.GF3513@opensource.wolfsonmicro.com>
Date:	Fri, 21 Oct 2011 10:00:55 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Ashish Chavan <ashish.chavan@...tcummins.com>
Cc:	"Girdwood, Liam" <lrg@...com>,
	alsa-devel <alsa-devel@...a-project.org>,
	David Dajun Chen <david.chen@...semi.com>,
	"kuninori.morimoto.gx" <kuninori.morimoto.gx@...esas.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [alsa-devel] [PATCH v7 2/3] ASoC: da7210: Add support for line
 out and DAC

On Fri, Oct 21, 2011 at 02:07:40PM +0530, Ashish Chavan wrote:
> On Thu, 2011-10-20 at 18:10 +0100, Girdwood, Liam wrote:

> > Any reason for not using DAPM here ? Otherwise they are always on
> > making your chip burn mW.....

> Not really. As explained in the comment in DAPM patch, this enables will
> be effective (burn mW) only after respective IO is taken out from
> STANDBY mode. DAPM takes care of managing STANDBY mode for all IOs and
> ADC/DAC. I know this way of handling low power mode is bit non-trivial,
> but it is what is recommended by chip designers. Actually Mark was also
> initially confused with this and requested to put enough documentation
> into code. After that I tried explaining the logic in source code
> comment in DAPM patch. Let me know if it is not clear and doesn't convey
> clearly what is should.

That'd be fine but there's no DAPM code in the patch, only code to
unconditionally enable on init.
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