ASoC: mediatek: mt6358: save PGA for mixer control

mt6358_amic_disable() resets PGA to 0.

Save the gain settings from mixer control and restore them when using
the microphone.
Signed-off-by: Tzung-Bi Shih <tzungbi@google.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/mt6358.c

@@ -450,6 +450,15 @@ static int mt6358_put_volsw(struct snd_kcontrol *kcontrol,
 		priv->ana_gain[AUDIO_ANALOG_VOLUME_HSOUTR] =
 			(reg >> RG_AUDHSGAIN_SFT) & RG_AUDHSGAIN_MASK;
 		break;
+	case MT6358_AUDENC_ANA_CON0:
+	case MT6358_AUDENC_ANA_CON1:
+		regmap_read(priv->regmap, MT6358_AUDENC_ANA_CON0, &reg);
+		priv->ana_gain[AUDIO_ANALOG_VOLUME_MICAMP1] =
+			(reg >> RG_AUDPREAMPLGAIN_SFT) & RG_AUDPREAMPLGAIN_MASK;
+		regmap_read(priv->regmap, MT6358_AUDENC_ANA_CON1, &reg);
+		priv->ana_gain[AUDIO_ANALOG_VOLUME_MICAMP2] =
+			(reg >> RG_AUDPREAMPRGAIN_SFT) & RG_AUDPREAMPRGAIN_MASK;
+		break;
 	}
 
 	return ret;
@@ -470,10 +479,10 @@ static const struct snd_kcontrol_new mt6358_snd_controls[] = {
 			   MT6358_ZCD_CON3, 0, 0x12, 1,
 			   snd_soc_get_volsw, mt6358_put_volsw, playback_tlv),
 	/* ul pga gain */
-	SOC_DOUBLE_R_TLV("PGA Volume",
+	SOC_DOUBLE_R_EXT_TLV("PGA Volume",
 			     MT6358_AUDENC_ANA_CON0, MT6358_AUDENC_ANA_CON1,
 			     8, 4, 0,
-			 pga_tlv),
+			     snd_soc_get_volsw, mt6358_put_volsw, pga_tlv),
 };
 
 /* MUX */
@@ -1750,6 +1759,21 @@ static void mt6358_dmic_disable(struct mt6358_priv *priv)
 	regmap_write(priv->regmap, MT6358_AUDENC_ANA_CON9, 0x0000);
 }
 
+static void mt6358_restore_pga(struct mt6358_priv *priv)
+{
+	unsigned int gain_l, gain_r;
+
+	gain_l = priv->ana_gain[AUDIO_ANALOG_VOLUME_MICAMP1];
+	gain_r = priv->ana_gain[AUDIO_ANALOG_VOLUME_MICAMP2];
+
+	regmap_update_bits(priv->regmap, MT6358_AUDENC_ANA_CON0,
+			   RG_AUDPREAMPLGAIN_MASK_SFT,
+			   gain_l << RG_AUDPREAMPLGAIN_SFT);
+	regmap_update_bits(priv->regmap, MT6358_AUDENC_ANA_CON1,
+			   RG_AUDPREAMPRGAIN_MASK_SFT,
+			   gain_r << RG_AUDPREAMPRGAIN_SFT);
+}
+
 static int mt_mic_type_event(struct snd_soc_dapm_widget *w,
 			     struct snd_kcontrol *kcontrol,
 			     int event)
@@ -1774,6 +1798,7 @@ static int mt_mic_type_event(struct snd_soc_dapm_widget *w,
 			mt6358_amic_enable(priv);
 			break;
 		}
+		mt6358_restore_pga(priv);
 
 		break;
 	case SND_SOC_DAPM_POST_PMD: