ASoC: ak4613: Implement suspend callback

Add the suspend callback to accompany the existing resume operation.
With the suspend/resume callbacks the regmap (regcache) state handling
can follow the recommended sequence.

Based on commit a2ebd58627e9aa48 ("ASoC: ak4642: Implement suspend
callback") by Peter Ujfalusi <peter.ujfalusi@ti.com>.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 11 insertions, 1 deletions

diff --git a/sound/soc/codecs/ak4613.c b/sound/soc/codecs/ak4613.c
index 5013d2ba0c10..97798d250f08 100644
--- a/sound/soc/codecs/ak4613.c
+++ b/sound/soc/codecs/ak4613.c
@@ -437,15 +437,25 @@ static struct snd_soc_dai_driver ak4613_dai = {
         .symmetric_rates = 1,
 };
 
-static int ak4613_resume(struct snd_soc_codec *codec)
+static int ak4613_suspend(struct snd_soc_codec *codec)
 {
         struct regmap *regmap = dev_get_regmap(codec->dev, NULL);
 
+        regcache_cache_only(regmap, true);
         regcache_mark_dirty(regmap);
+        return 0;
+}
+
+static int ak4613_resume(struct snd_soc_codec *codec)
+{
+        struct regmap *regmap = dev_get_regmap(codec->dev, NULL);
+
+        regcache_cache_only(regmap, false);
         return regcache_sync(regmap);
 }
 
 static struct snd_soc_codec_driver soc_codec_dev_ak4613 = {
+        .suspend                = ak4613_suspend,
         .resume                 = ak4613_resume,
         .set_bias_level         = ak4613_set_bias_level,
         .controls               = ak4613_snd_controls,