linux-kernel - Re: [PATCH] ASoC: max98090: add shutdown callback for max98090

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Date:	Wed, 08 Apr 2015 18:14:18 +0800
From:	Caesar Wang <wxt@...k-chips.com>
To:	Heiko Stübner <heiko@...ech.de>
CC:	Sonny Rao <sonnyrao@...omium.org>,
	Cheng-Yi Chiang <cychiang@...omium.org>,
	Mark Brown <broonie@...nel.org>,
	zhengxing <zhengxing@...k-chips.com>,
	"jay.xu" <xjq@...k-chips.com>, linux-rockchip@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	dri-devel@...ts.freedesktop.org, Jaroslav Kysela <perex@...ex.cz>,
	alsa-devel@...a-project.org, Takashi Iwai <tiwai@...e.de>,
	linux-kernel@...r.kernel.org, Dylan Reid <dgreid@...omium.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
	Tushar Behera <tushar.b@...sung.com>
Subject: Re: [PATCH] ASoC: max98090: add shutdown callback for max98090

Heiko,

在 2015年04月08日 17:25, Heiko Stübner 写道:
> Hi Caesar,
>
> Am Mittwoch, 8. April 2015, 16:52:08 schrieb Caesar Wang:
>> To fix pop noise when shutdown,the pop noise during shutdown
>> is the pmic cutoff power of codec without any notice.
>>
>> Signed-off-by: jay.xu <xjq@...k-chips.com>
>> Signed-off-by: zhengxing <zhengxing@...k-chips.com>
>> Signed-off-by: Caesar Wang <wxt@...k-chips.com>
>>
>> Serien-cc: linux-kernel@...r.kernel.org
>> Serien-cc: devicetree@...r.kernel.org
>> Serien-cc: dianders@...omium.org
>>
>> ---
>>
>>   sound/soc/codecs/max98090.c | 17 +++++++++++++++++
>>   1 file changed, 17 insertions(+)
>>
>> diff --git a/sound/soc/codecs/max98090.c b/sound/soc/codecs/max98090.c
>> index b112b1c..066954a0 100644
>> --- a/sound/soc/codecs/max98090.c
>> +++ b/sound/soc/codecs/max98090.c
>> @@ -2611,6 +2611,22 @@ static int max98090_i2c_remove(struct i2c_client
>> *client) return 0;
>>   }
>>
>> +static void max98090_i2c_shutdown(struct i2c_client *i2c)
>> +{
>> +	struct max98090_priv *max98090 = dev_get_drvdata(&i2c->dev);
>> +
>> +	dev_info(&i2c->dev, "shut down device\n");
> is this dev_info really necessary? dev_dbg might be better, or leave it out
> completely, as it doesn't really provide any additional benefit.
>

As Mark suggestion, I will remove it.
>> +
>> +	/* Enable volume smoothing, disable zero cross.  This will cause
>> +	 * a quick 40ms ramp to mute on shutdown.
>> +	 */
> Comment style is off ... should be
>
> /*
>   * Enable volume smoothing, disable zero cross.  This will cause
>   * a quick 40ms ramp to mute on shutdown.
>   */
>

Done
>> +	regmap_write(max98090->regmap,
>> +		M98090_REG_LEVEL_CONTROL, M98090_VSENN_MASK);
>> +	regmap_write(max98090->regmap,
>> +		M98090_REG_DEVICE_SHUTDOWN, 0x00);
>> +	msleep(40);
>> +}
>> +
>>   #ifdef CONFIG_PM
>>   static int max98090_runtime_resume(struct device *dev)
>>   {
>> @@ -2697,6 +2713,7 @@ static struct i2c_driver max98090_i2c_driver = {
>>   	},
>>   	.probe  = max98090_i2c_probe,
>>   	.remove = max98090_i2c_remove,
>> +	.shutdown = max98090_i2c_shutdown,
>>   	.id_table = max98090_i2c_id,
>>   };
>
>
>

-- 
**************************************************************************************
王晓腾    Caesar Wang
系统产品三部   Product R&D Dept.III
福州瑞芯微电子有限公司 Fuzhou Rockchip Electronics Co.Ltd
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