linux-kernel - Re: [PATCH v2 2/2] ASoC: fsl: imx-wm8962: Grant hw

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Message-ID: <20131210111505.GE29268@sirena.org.uk>
Date:	Tue, 10 Dec 2013 11:15:05 +0000
From:	Mark Brown <broonie@...nel.org>
To:	Nicolin Chen <Guangyu.Chen@...escale.com>
Cc:	Nicolin Chen <b42378@...escale.com>, lgirdwood@...il.com,
	alsa-devel@...a-project.org, tiwai@...e.de, perex@...ex.cz,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] ASoC: fsl: imx-wm8962: Grant hw_params/free()
 permission to control FLL

On Tue, Dec 10, 2013 at 06:51:36PM +0800, Nicolin Chen wrote:
> On Tue, Dec 10, 2013 at 10:47:45AM +0000, Mark Brown wrote:

> > For this sort of question you should follow the DAPM graph...  the
> > headphone and speaker mixers have IN4 and MIXIN as inputs for analogue
> > bypass and the STL and STR paths provide digital sidetones through the
> > ADC and DAC.

> So I could test it merely by using 'amixer cset' to enable those switches
> without doing anything to power WM8962 up as long as my operation follows
> the DAPM graph so that the DPAM would automatically turn on the regulator
> for me?

Yes, as soon as you have a complete path from an active input to an
active output the path should get powered up.

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