[alsa-devel] [PATCH] ASoC: sgtl5000: Make device cache only when powered off

[Mark Brown]

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 at linaro.org>
---
 sound/soc/codecs/sgtl5000.c |   15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/sound/soc/codecs/sgtl5000.c b/sound/soc/codecs/sgtl5000.c
index 1c3b20f..85a32e6 100644
--- a/sound/soc/codecs/sgtl5000.c
+++ b/sound/soc/codecs/sgtl5000.c
@@ -911,10 +911,25 @@ 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;
-- 
1.7.10.4