ASoC: codecs: da9055: Minor improvement in ALC calibration process

This patch slightly improves ALC calibration process of da9055 codec
driver by muting Mic PGAs during calibration.

Signed-off-by: Ashish Chavan <ashish.chavan@kpitcummins.com>
Signed-off-by: David Dajun Chen <david.chen@diasemi.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/da9055.c

@@ -178,6 +178,12 @@
 #define DA9055_AIF_WORD_S24_LE		(2 << 2)
 #define DA9055_AIF_WORD_S32_LE		(3 << 2)
 
+/* MIC_L_CTRL bit fields */
+#define DA9055_MIC_L_MUTE_EN		(1 << 6)
+
+/* MIC_R_CTRL bit fields */
+#define DA9055_MIC_R_MUTE_EN		(1 << 6)
+
 /* MIXIN_L_CTRL bit fields */
 #define DA9055_MIXIN_L_MIX_EN		(1 << 3)
 
@@ -476,7 +482,7 @@ static int da9055_put_alc_sw(struct snd_kcontrol *kcontrol,
 			     struct snd_ctl_elem_value *ucontrol)
 {
 	struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
-	u8 reg_val, adc_left, adc_right;
+	u8 reg_val, adc_left, adc_right, mic_left, mic_right;
 	int avg_left_data, avg_right_data, offset_l, offset_r;
 
 	if (ucontrol->value.integer.value[0]) {
@@ -485,6 +491,16 @@ static int da9055_put_alc_sw(struct snd_kcontrol *kcontrol,
 		 * offsets must be done first
 		 */
 
+		/* Save current values from Mic control registers */
+		mic_left = snd_soc_read(codec, DA9055_MIC_L_CTRL);
+		mic_right = snd_soc_read(codec, DA9055_MIC_R_CTRL);
+
+		/* Mute Mic PGA Left and Right */
+		snd_soc_update_bits(codec, DA9055_MIC_L_CTRL,
+				    DA9055_MIC_L_MUTE_EN, DA9055_MIC_L_MUTE_EN);
+		snd_soc_update_bits(codec, DA9055_MIC_R_CTRL,
+				    DA9055_MIC_R_MUTE_EN, DA9055_MIC_R_MUTE_EN);
+
 		/* Save current values from ADC control registers */
 		adc_left = snd_soc_read(codec, DA9055_ADC_L_CTRL);
 		adc_right = snd_soc_read(codec, DA9055_ADC_R_CTRL);
@@ -520,6 +536,10 @@ static int da9055_put_alc_sw(struct snd_kcontrol *kcontrol,
 		/* Restore original values of ADC control registers */
 		snd_soc_write(codec, DA9055_ADC_L_CTRL, adc_left);
 		snd_soc_write(codec, DA9055_ADC_R_CTRL, adc_right);
+
+		/* Restore original values of Mic control registers */
+		snd_soc_write(codec, DA9055_MIC_L_CTRL, mic_left);
+		snd_soc_write(codec, DA9055_MIC_R_CTRL, mic_right);
 	}
 
 	return snd_soc_put_volsw(kcontrol, ucontrol);