linux-kernel - Re: [alsa-devel] [PATCH v2] ASoC: codecs: Add DA9055 codec driver

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Message-ID: <20120919025035.GI8832@opensource.wolfsonmicro.com>
Date:	Tue, 18 Sep 2012 22:50:36 -0400
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Ashish Chavan <ashish.chavan@...tcummins.com>
Cc:	lrg <lrg@...com>, alsa-devel <alsa-devel@...a-project.org>,
	David Dajun Chen <david.chen@...semi.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [alsa-devel] [PATCH v2] ASoC: codecs: Add DA9055 codec driver

On Fri, Sep 14, 2012 at 04:57:37PM +0530, Ashish Chavan wrote:

This looks like a good improvement, a few issues remain though:

> +	/* DAC Routing control */
> +	SOC_ENUM("DAC Left Select", da9055_dac_l_select),
> +	SOC_ENUM("DAC Right Select", da9055_dac_r_select),

DAPM.  This even says its a routing control...

> +	/* To select if MIC Bias powers MIC 1 or MIC 2 */
> +	SOC_ENUM("Mic Bias Select", da9055_mic_bias_select),

This would normally be something controlled by the board...  what
exactly is this doing?  How does the MICBIAS relate to the microphone
inputs?

> +	case SND_SOC_BIAS_STANDBY:
> +		if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
> +			/* Enable VMID reference & master bias */
> +			snd_soc_update_bits(codec, DA9055_REFERENCES,
> +					    DA9055_VMID_EN | DA9055_BIAS_EN,
> +					    DA9055_VMID_EN | DA9055_BIAS_EN);
> +		}
> +		regcache_sync(da9055->regmap);

Doing the sync every time is very odd, why is it only done on
transitions from _OFF?  Given that there's no regulator support here
it's also a bit surprising that you need to do a sync outside of system
suspend...

> +	da9055->mclk_rate       = 0;    /* This will be set from set_sysclk() */
> +	da9055->master          = 0;    /* This will be set from set_fmt() */

You use kzalloc...
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