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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>
This commit is contained in:
Barry Song 2009-12-25 14:10:06 +08:00 committed by Mark Brown
parent 18240b67c8
commit afe1c2cd71
1 changed files with 32 additions and 0 deletions
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32
sound/soc/codecs/ad1836.c
View File

@ -223,6 +223,36 @@ static unsigned int ad1836_read_reg_cache(struct snd_soc_codec *codec,
return reg_cache[reg];
}
#ifdef CONFIG_PM
static int ad1836_soc_suspend(struct platform_device *pdev,
pm_message_t state)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
struct snd_soc_codec *codec = socdev->card->codec;
/* reset clock control mode */
u16 adc_ctrl2 = codec->read(codec, AD1836_ADC_CTRL2);
adc_ctrl2 &= ~AD1836_ADC_SERFMT_MASK;
return codec->write(codec, AD1836_ADC_CTRL2, adc_ctrl2);
}
static int ad1836_soc_resume(struct platform_device *pdev)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
struct snd_soc_codec *codec = socdev->card->codec;
/* restore clock control mode */
u16 adc_ctrl2 = codec->read(codec, AD1836_ADC_CTRL2);
adc_ctrl2 |= AD1836_ADC_AUX;
return codec->write(codec, AD1836_ADC_CTRL2, adc_ctrl2);
}
#else
#define ad1836_soc_suspend NULL
#define ad1836_soc_resume NULL
#endif
static int __devinit ad1836_spi_probe(struct spi_device *spi)
{
struct snd_soc_codec *codec;
@ -404,6 +434,8 @@ static int ad1836_remove(struct platform_device *pdev)
struct snd_soc_codec_device soc_codec_dev_ad1836 = {
.probe = ad1836_probe,
.remove = ad1836_remove,
.suspend = ad1836_soc_suspend,
.resume = ad1836_soc_resume,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_ad1836);