linux-kernel - Re: [PATCH 2/4] ASoC: sunxi: Add Allwinner A10 Digital Audio driver

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Date:	Fri, 10 Jun 2016 09:36:43 +0200
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Mark Brown <broonie@...nel.org>
Cc:	Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
	Andrea Venturi <ennesimamail.av@...il.com>,
	Code Kipper <codekipper@...il.com>, gianfranco@...devices.com
Subject: Re: [PATCH 2/4] ASoC: sunxi: Add Allwinner A10 Digital Audio driver

Hi Mark,

On Fri, Jun 10, 2016 at 01:37:55AM +0100, Mark Brown wrote:
> > > > +static int sun4i_i2s_dai_probe(struct snd_soc_dai *dai)
> > > > +{
> > > > +	struct sun4i_i2s *i2s = snd_soc_dai_get_drvdata(dai);
> 
> > > > +	/* Enable the whole hardware block */
> > > > +	regmap_write(i2s->regmap, SUN4I_I2S_CTRL_REG,
> > > > +		     SUN4I_I2S_CTRL_GL_EN);
> 
> > > Runtime PM?  It also seems like this is something that ought to be
> > > covered in the suspend and resume callbacks.
> 
> > runtime_pm is supported, and uses the regmap cache to keep those
> > changes.
> 
> No, my point is that I'd expect to see the block powered off on suspend.

It is. The bus clock is disabled, which also puts the IP in reset.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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