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

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Message-ID: <20131210110842.GD12042@MrMyself>
Date:	Tue, 10 Dec 2013 19:08:44 +0800
From:	Nicolin Chen <Guangyu.Chen@...escale.com>
To:	Mark Brown <broonie@...nel.org>
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 11:15:05AM +0000, Mark Brown wrote:
> 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.

I'll try again tomorrow. Thank you sir.


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