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>

2 files changed, 33 insertions, 0 deletions

diff --git a/sound/soc/codecs/ad1836.c b/sound/soc/codecs/ad1836.c
index 2c18e3d1b71e..83add2f3afba 100644
--- a/sound/soc/codecs/ad1836.c
+++ b/sound/soc/codecs/ad1836.c
@@ -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);
 
diff --git a/sound/soc/codecs/ad1836.h b/sound/soc/codecs/ad1836.h
index 7660ee6973c0..e9d90d3951c5 100644
--- a/sound/soc/codecs/ad1836.h
+++ b/sound/soc/codecs/ad1836.h
@@ -54,6 +54,7 @@
 #define AD1836_ADC_SERFMT_MASK         (7 << 6)
 #define AD1836_ADC_SERFMT_PCK256       (0x4 << 6)
 #define AD1836_ADC_SERFMT_PCK128       (0x5 << 6)
+#define AD1836_ADC_AUX                 (0x6 << 6)
 
 #define AD1836_ADC_CTRL3               14