[alsa-devel] sgtl5000 fails after suspend/resume

[Fabio Estevam]

Hi Mark,

On Thu, Feb 15, 2018 at 4:16 PM, Mark Brown <broonie at kernel.org> wrote:

> Does it need a register map resync when powering on again?

Thanks for your suggestion! This works:

--- 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_component *component,
                                   enum snd_soc_bias_level level)
 {
+       struct sgtl5000_priv *sgtl = snd_soc_component_get_drvdata(component);
+       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_component_update_bits(component,
SGTL5000_CHIP_ANA_POWER,
                                    SGTL5000_REFTOP_POWERUP,
                                    SGTL5000_REFTOP_POWERUP);
                break;
        case SND_SOC_BIAS_OFF:
+               regcache_cache_only(sgtl->regmap, true);
                snd_soc_component_update_bits(component,
SGTL5000_CHIP_ANA_POWER,
                                    SGTL5000_REFTOP_POWERUP, 0);
                break;