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ASoC: ad1836: reset and restore clock control mode in suspend/resume entry
Tests show frequent suspend/resume(frequent poweroff/on ad1836 internal components) maybe make ad1836 clock mode wrong sometimes after wakeup. This patch reset/restore ad1836 clock mode while executing PM, then ad1836 can always resume to right clock status. Signed-off-by: Barry Song <21cnbao@gmail.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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@ -223,6 +223,36 @@ static unsigned int ad1836_read_reg_cache(struct snd_soc_codec *codec,
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return reg_cache[reg];
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}
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#ifdef CONFIG_PM
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static int ad1836_soc_suspend(struct platform_device *pdev,
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pm_message_t state)
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{
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struct snd_soc_device *socdev = platform_get_drvdata(pdev);
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struct snd_soc_codec *codec = socdev->card->codec;
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/* reset clock control mode */
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u16 adc_ctrl2 = codec->read(codec, AD1836_ADC_CTRL2);
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adc_ctrl2 &= ~AD1836_ADC_SERFMT_MASK;
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return codec->write(codec, AD1836_ADC_CTRL2, adc_ctrl2);
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}
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static int ad1836_soc_resume(struct platform_device *pdev)
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{
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struct snd_soc_device *socdev = platform_get_drvdata(pdev);
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struct snd_soc_codec *codec = socdev->card->codec;
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/* restore clock control mode */
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u16 adc_ctrl2 = codec->read(codec, AD1836_ADC_CTRL2);
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adc_ctrl2 |= AD1836_ADC_AUX;
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return codec->write(codec, AD1836_ADC_CTRL2, adc_ctrl2);
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}
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#else
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#define ad1836_soc_suspend NULL
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#define ad1836_soc_resume NULL
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#endif
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static int __devinit ad1836_spi_probe(struct spi_device *spi)
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{
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struct snd_soc_codec *codec;
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@ -404,6 +434,8 @@ static int ad1836_remove(struct platform_device *pdev)
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struct snd_soc_codec_device soc_codec_dev_ad1836 = {
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.probe = ad1836_probe,
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.remove = ad1836_remove,
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.suspend = ad1836_soc_suspend,
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.resume = ad1836_soc_resume,
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};
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EXPORT_SYMBOL_GPL(soc_codec_dev_ad1836);
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