linux-kernel - Re: [PATCH] ASoC: cs42888: Add codec driver support

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Date:	Mon, 24 Feb 2014 15:52:24 +0000
From:	"Austin, Brian" <Brian.Austin@...rus.com>
To:	Mark Brown <broonie@...nel.org>
CC:	Nicolin Chen <Guangyu.Chen@...escale.com>,
	"Handrigan, Paul" <Paul.Handrigan@...rus.com>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"pawel.moll@....com" <pawel.moll@....com>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	"galak@...eaurora.org" <galak@...eaurora.org>,
	"rob@...dley.net" <rob@...dley.net>,
	Liam Girdwood <lgirdwood@...il.com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>
Subject: Re: [PATCH] ASoC: cs42888: Add codec driver support


> 
>> +	/* Disable auto-mute */
>> +	regmap_update_bits(cs42888->regmap, CS42888_TXCTL,
>> +			   CS42888_TXCTL_AMUTE | CS42888_TXCTL_DAC_SZC_MASK,
>> +			   CS42888_TXCTL_DAC_SZC_SR);
> 
> Does this interfere with the manual mute controls or is it a separate
> thing?  If it plays nicely with the manual controls it's probably better
> to leave it enabled since it improves performance in some benchmarks
> (that's why hardware tends to have the feature).

Auto-Mute should be enabled by default.

> 
>> +	if (!IS_ERR(cs42888->clk))
>> +		clk_disable_unprepare(cs42888->clk);
> 
> Does the device work without MCLK?
Yes, MCLK is required. If you can’t get the clock you should error out.



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