ASoC: max98373: Changed amp shutdown register as volatile

0x20FF(amp global enable) register was defined as non-volatile,
but it is not. Overheating, overcurrent can cause amp shutdown
in hardware.
'regmap_write' compare register readback value before writing
to avoid same value writing. 'regmap_read' just read cache
not actual hardware value for the non-volatile register.
When amp is internally shutdown by some reason, next 'AMP ON'
command can be ignored because regmap think amp is already ON.

Signed-off-by: Ryan Lee <ryans.lee@maximintegrated.com>
Link: https://lore.kernel.org/r/20210325033555.29377-1-ryans.lee@maximintegrated.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/codecs/max98373-i2c.c b/sound/soc/codecs/max98373-i2c.c
index 85f6865..ddb6436 100644 (file)
--- a/sound/soc/codecs/max98373-i2c.c
+++ b/sound/soc/codecs/max98373-i2c.c
@@ -446,6 +446,7 @@ static bool max98373_volatile_reg(struct device *dev, unsigned int reg)
        case MAX98373_R2054_MEAS_ADC_PVDD_CH_READBACK:
        case MAX98373_R2055_MEAS_ADC_THERM_CH_READBACK:
        case MAX98373_R20B6_BDE_CUR_STATE_READBACK:
+       case MAX98373_R20FF_GLOBAL_SHDN:
        case MAX98373_R21FF_REV_ID:
                return true;
        default:

diff --git a/sound/soc/codecs/max98373-sdw.c b/sound/soc/codecs/max98373-sdw.c
index d8c4766..f3a1220 100644 (file)
--- a/sound/soc/codecs/max98373-sdw.c
+++ b/sound/soc/codecs/max98373-sdw.c
@@ -220,6 +220,7 @@ static bool max98373_volatile_reg(struct device *dev, unsigned int reg)
        case MAX98373_R2054_MEAS_ADC_PVDD_CH_READBACK:
        case MAX98373_R2055_MEAS_ADC_THERM_CH_READBACK:
        case MAX98373_R20B6_BDE_CUR_STATE_READBACK:
+       case MAX98373_R20FF_GLOBAL_SHDN:
        case MAX98373_R21FF_REV_ID:
        /* SoundWire Control Port Registers */
        case MAX98373_R0040_SCP_INIT_STAT_1 ... MAX98373_R0070_SCP_FRAME_CTLR: