linux-kernel - Re: [PATCH v4] ASoC: tas2552: Support TI TAS2552 Amplifier

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Message-ID: <53B56F63.8000400@ti.com>
Date:	Thu, 3 Jul 2014 09:57:39 -0500
From:	Dan Murphy <dmurphy@...com>
To:	<balbi@...com>
CC:	<linux-sound@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<alsa-devel@...a-project.org>, <broonie@...nel.org>,
	<devicetree@...r.kernel.org>
Subject: Re: [PATCH v4] ASoC: tas2552: Support TI TAS2552 Amplifier

On 07/03/2014 09:52 AM, Felipe Balbi wrote:
> Hi,
>
> On Thu, Jul 03, 2014 at 09:39:53AM -0500, Dan Murphy wrote:
>> +static int tas2552_set_dai_fmt(struct snd_soc_dai *dai, unsigned int fmt)
>> +{
>> +	u8 serial_format;
>> +	struct snd_soc_codec *codec = dai->codec;
>> +
>> +	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
>> +	case SND_SOC_DAIFMT_CBS_CFS:
>> +		serial_format = 0x00;
>> +		break;
>> +	case SND_SOC_DAIFMT_CBS_CFM:
>> +		serial_format = TAS2552_WORD_CLK_MASK;
>> +		break;
>> +	case SND_SOC_DAIFMT_CBM_CFS:
>> +		serial_format = TAS2552_BIT_CLK_MASK;
>> +		break;
>> +	case SND_SOC_DAIFMT_CBM_CFM:
>> +		serial_format = (TAS2552_BIT_CLK_MASK | TAS2552_WORD_CLK_MASK);
>> +		break;
>> +	default:
>> +		return -EINVAL;
>> +	}
>> +
>> +	pm_runtime_get_sync(codec->dev);
>> +
>> +	snd_soc_update_bits(codec, TAS2552_SER_CTRL_1,
>> +			    (TAS2552_BIT_CLK_MASK | TAS2552_WORD_CLK_MASK),
>> +			    serial_format);
>> +
>> +	pm_runtime_put(codec->dev);
> I have a feeling it's better to just put at the end of the function.
> Remember your pm_runtime_put() will issue i2c transfers which can take a
> looooooong time ;-)

I thought about that but the next switch case could return if the format
mask is invalid which means the runtime calls would not be balanced.

So I decided to wrap the snd_soc calls with the pm_runtime calls to keep it
balanced.

Dan

>
> other than that, looks ok to me:
>
> Reviewed-by: Felipe Balbi <balbi@...com>
>


-- 
------------------
Dan Murphy

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