Message-id: <20150105214039.2f6065fe@songinha-Samsung-DeskTop-System>
Date:	Mon, 05 Jan 2015 21:40:39 +0900
From:	Inha Song <ideal.song@...sung.com>
To:	Lars-Peter Clausen <lars@...afoo.de>
Cc:	alsa-devel@...a-project.org, mark.rutland@....com,
	devicetree@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	linux@....linux.org.uk, pawel.moll@....com,
	ijc+devicetree@...lion.org.uk, sbkim73@...sung.com,
	linux-kernel@...r.kernel.org, robh+dt@...nel.org,
	lgirdwood@...il.com, tiwai@...e.de, broonie@...nel.org,
	kgene@...nel.org, s.nawrocki@...sung.com, galak@...eaurora.org,
	grant.likely@...aro.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [alsa-devel] [PATCH 1/3] ASoC: samsung: Add machine driver for
 Trats2

Hi,

Thanks for your comments.


> Hi,
> 
> A few small comments inline.
> 
> On 01/05/2015 12:25 PM, Inha Song wrote:
> > --- /dev/null
> > +++ b/sound/soc/samsung/trats2_wm1811.c
> > @@ -0,0 +1,216 @@
> >[...]
> > +#include <linux/of.h>
> > +#include <linux/module.h>
> > +#include <linux/clk.h>
> > +#include <sound/soc.h>
> > +#include <sound/pcm_params.h>
> > +#include "i2s.h"
> > +#include "i2s-regs.h"
> 
> You probably don't need i2s-regs.h

OK, I will remove.

> 
> > +#include "../codecs/wm8994.h"
> > +
> > +struct trats2_machine_priv {
> > +	struct clk *clk_mclk;
> > +};
> > +
> > +static struct trats2_machine_priv trats2_wm1811_priv;
> > +
> > +static const struct snd_kcontrol_new trats2_controls[] = {
> > +	SOC_DAPM_PIN_SWITCH("SPK"),
> > +};
> > +
> > +const struct snd_soc_dapm_widget trats2_dapm_widgets[] = {
> 
> static

Sorry for my mistake.

> 
> > +	SND_SOC_DAPM_SPK("SPK", NULL),
> > +};
> > +
> > +static int trats2_aif1_hw_params(struct snd_pcm_substream *substream,
> > +				 struct snd_pcm_hw_params *params)
> > +{
> > +	struct snd_soc_pcm_runtime *rtd = substream->private_data;
> > +	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
> > +	struct snd_soc_dai *codec_dai = rtd->codec_dai;
> > +	struct trats2_machine_priv *priv = snd_soc_card_get_drvdata(rtd->card);
> > +	unsigned int sysclk_rate;
> > +	unsigned int mclk_rate =
> > +			(unsigned int)clk_get_rate(priv->clk_mclk);
> > +	int ret;
> > +
> > +	/* Set the codec DAI configuration to Master*/
> > +	ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S
> > +					| SND_SOC_DAIFMT_NB_NF
> > +					| SND_SOC_DAIFMT_CBM_CFM);
> > +	if (ret < 0) {
> > +		dev_err(codec_dai->dev,
> > +			"Failed to set codec dai format: %d\n", ret);
> > +		return ret;
> > +	}
> > +
> > +	/* Set the cpu DAI configuration to Slave */
> > +	ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S
> > +					| SND_SOC_DAIFMT_NB_NF
> > +					| SND_SOC_DAIFMT_CBM_CFM);
> > +	if (ret < 0) {
> > +		dev_err(cpu_dai->dev,
> > +			"Failed to set cpu dai format: %d\n", ret);
> > +		return ret;
> > +	}
> 
> 
> Use the dai_fmt field in the dai_link struct to setup the DAI link format. 
> This will configure both the CPU and the CODEC DAI with the specified 
> format, no need to do it manually.

Ok, move to dai_fmt.

> 
> >[...]
> > +static struct snd_soc_ops trats2_aif1_ops = {
> 
> const

I will fix this.

> 
> > +	.hw_params = trats2_aif1_hw_params,
> > +};
> > +
> > +static int trats2_init_paiftx(struct snd_soc_pcm_runtime *rtd)
> > +{
> > +	struct snd_soc_codec *codec = rtd->codec;
> > +	struct snd_soc_card *card = rtd->card;
> > +	struct trats2_machine_priv *priv = snd_soc_card_get_drvdata(card);
> > +	int ret;
> > +
> > +	ret = clk_prepare_enable(priv->clk_mclk);
> 
> Maybe just do this in the platform device probe handler and you should have 
> a matching disable call somewhere.

Ok, I will move clk_prepare_enable call to snd_soc_ops->startup
and clk_disable_unprepare call to snd_soc_ops->shutdown.

Best Regards,
Inha Song.

> 
> > +	if (ret) {
> > +		dev_err(codec->dev, "Failed to enable mclk: %d\n", ret);
> > +		return ret;
> > +	}
> > +
> > +	return 0;
> > +}
> >[...]
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