[PATCH 4.9 71/86] ASoC: sgtl5000: Fix suspend/resume

Greg Kroah-Hartman
2018-03-16T15:23:34Z

From: Fabio Estevam <fabio.estevam@nxp.com>

commit a8992973edbb2555e956b90f6fe97c4bc14d761d upstream.

Commit 8419caa72702 ("ASoC: sgtl5000: Do not disable regulators in
SND_SOC_BIAS_OFF") causes the sgtl5000 to fail after a suspend/resume
sequence:

Playing WAVE '/media/a2002011001-e02.wav' : Signed 16 bit Little
Endian, Rate 44100 Hz, Stereo
aplay: pcm_write:2051: write error: Input/output error

The problem is caused by the fact that the aforementioned commit
dropped the cache handling, so re-introduce the register map
resync to fix the problem.

Suggested-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
sound/soc/codecs/sgtl5000.c | 11 +++++++++++
1 file changed, 11 insertions(+)

--- a/sound/soc/codecs/sgtl5000.c
+++ b/sound/soc/codecs/sgtl5000.c
@@ -774,15 +774,26 @@ static int sgtl5000_pcm_hw_params(struct
static int sgtl5000_set_bias_level(struct snd_soc_codec *codec,
enum snd_soc_bias_level level)
{
+ struct sgtl5000_priv *sgtl = snd_soc_codec_get_drvdata(codec);
+ int ret;
+
switch (level) {
case SND_SOC_BIAS_ON:
case SND_SOC_BIAS_PREPARE:
case SND_SOC_BIAS_STANDBY:
+ regcache_cache_only(sgtl->regmap, false);
+ ret = regcache_sync(sgtl->regmap);
+ if (ret) {
+ regcache_cache_only(sgtl->regmap, true);
+ return ret;
+ }
+
snd_soc_update_bits(codec, SGTL5000_CHIP_ANA_POWER,
SGTL5000_REFTOP_POWERUP,
SGTL5000_REFTOP_POWERUP);
break;
case SND_SOC_BIAS_OFF:
+ regcache_cache_only(sgtl->regmap, true);
snd_soc_update_bits(codec, SGTL5000_CHIP_ANA_POWER,
SGTL5000_REFTOP_POWERUP, 0);
break;