ASoC: sgtl5000: Fix suspend/resume

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>

diff --git a/sound/soc/codecs/sgtl5000.c b/sound/soc/codecs/sgtl5000.c
index f2bb4fe..0b11a2e 100644 (file)
--- a/sound/soc/codecs/sgtl5000.c
+++ b/sound/soc/codecs/sgtl5000.c
@@ -871,15 +871,26 @@ static int sgtl5000_pcm_hw_params(struct snd_pcm_substream *substream,
 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;