linux-kernel - Re: [PATCH v7 1/4] ASoC: arizona: Export functions to control subsystem DVFS

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Date:	Tue, 2 Jun 2015 11:32:41 +0100
From:	Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>
To:	Mark Brown <broonie@...nel.org>
Cc:	patches@...nsource.wolfsonmicro.com, linux-kernel@...r.kernel.org,
	alsa-devel@...a-project.org, lgirdwood@...il.com
Subject: Re: [PATCH v7 1/4] ASoC: arizona: Export functions to control
	subsystem DVFS

On Mon, Jun 01, 2015 at 05:36:04PM +0100, Mark Brown wrote:
> On Mon, Jun 01, 2015 at 05:22:51PM +0100, Richard Fitzgerald wrote:
> > On Mon, Jun 01, 2015 at 05:10:47PM +0100, Mark Brown wrote:
> 
> > > > +		if (priv->dvfs_reqs)
> > > > +			ret = arizona_dvfs_disable(codec);
> 
> > > Are you sure that the function shouldn't check for requests?  It seems
> > > like every caller is repeating the same check.
> 
> > Sorry, I don't understand your comment here. When SYSCLK is disabled
> > we need to disable DVFS so that the codec can't go into suspend in the
> > illegal state of DVFS enabled but insifficient DCVDD. However, if
> > dvfs_reqs==0 DVFS is already disabled so we can save some time.
> 
> Sure, but you repeat the same tests for dvfs_reqs at every call site
> which suggests it should be factored into the functions.

I don't. There are two cases that call them if (!dvfs_reqs) and two
that call them if (dvfs_reqs)


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