MT6357_ZCD_CON2
regmap_read(priv->regmap, MT6357_ZCD_CON2, &lgain);
regmap_update_bits(priv->regmap, MT6357_ZCD_CON2,
regmap_update_bits(priv->regmap, MT6357_ZCD_CON2,
volume_ramp(priv, lfrom, lto, rfrom, rto, MT6357_ZCD_CON2);
MT6357_ZCD_CON2, MT6357_AUD_HPL_GAIN_SFT,