ASoC: sgtl5000: Make device cache only when powered off

When the regulators have been disabled mark the device as cache only so
that we don't try to interact with the hardware.

Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 15 insertions, 0 deletions

diff --git a/sound/soc/codecs/sgtl5000.c b/sound/soc/codecs/sgtl5000.c
index b4297416401e..c8f2afb74706 100644
--- a/sound/soc/codecs/sgtl5000.c
+++ b/sound/soc/codecs/sgtl5000.c
@@ -907,10 +907,25 @@ static int sgtl5000_set_bias_level(struct snd_soc_codec *codec,
                         if (ret)
                                 return ret;
                         udelay(10);
+
+                        regcache_cache_only(sgtl5000->regmap, false);
+
+                        ret = regcache_sync(sgtl5000->regmap);
+                        if (ret != 0) {
+                                dev_err(codec->dev,
+                                        "Failed to restore cache: %d\n", ret);
+
+                                regcache_cache_only(sgtl5000->regmap, true);
+                                regulator_bulk_disable(ARRAY_SIZE(sgtl5000->supplies),
+                                                       sgtl5000->supplies);
+
+                                return ret;
+                        }
                 }
 
                 break;
         case SND_SOC_BIAS_OFF:
+                regcache_cache_only(sgtl5000->regmap, true);
                 regulator_bulk_disable(ARRAY_SIZE(sgtl5000->supplies),
                                         sgtl5000->supplies);
                 break;