asoc: codecs: enable bcs port for headset record

Enable button click suppression port to send mbhc
events over the port to reduce glitches caused
by button events or plug removal events on the
record path.

Change-Id: I3f913ab1287f06afe6b5fc95da626f7c78ab448f
Signed-off-by: Karthikeyan Mani <kmani@codeaurora.org>

asoc/codecs/wcd937x/wcd937x.c

@@ -46,6 +46,7 @@ enum {
 	ALLOW_BUCK_DISABLE,
 	HPH_COMP_DELAY,
 	HPH_PA_DELAY,
+	AMIC2_BCS_ENABLE,
 };
 
 static const DECLARE_TLV_DB_SCALE(line_gain, 0, 7, 1);
@@ -1283,10 +1284,21 @@ static int wcd937x_codec_enable_adc(struct snd_soc_dapm_widget *w,
 				WCD937X_DIGITAL_CDC_ANA_CLK_CTL, 0x08, 0x08);
 		snd_soc_component_update_bits(component,
 				WCD937X_DIGITAL_CDC_ANA_CLK_CTL, 0x10, 0x10);
+		/* Enable BCS for Headset mic */
+		if (w->shift == 1 && !(snd_soc_component_read32(component,
+				WCD937X_TX_NEW_TX_CH2_SEL) & 0x80)) {
+			wcd937x_tx_connect_port(codec, MBHC, true);
+			set_bit(AMIC2_BCS_ENABLE, &wcd937x->status_mask);
+		}
 		wcd937x_tx_connect_port(component, ADC1 + (w->shift), true);
 		break;
 	case SND_SOC_DAPM_POST_PMD:
 		wcd937x_tx_connect_port(component, ADC1 + (w->shift), false);
+		if (w->shift == 1 &&
+			test_bit(AMIC2_BCS_ENABLE, &wcd937x->status_mask)) {
+			wcd937x_tx_connect_port(codec, MBHC, false);
+			clear_bit(AMIC2_BCS_ENABLE, &wcd937x->status_mask);
+		}
 		snd_soc_component_update_bits(component,
 				WCD937X_DIGITAL_CDC_ANA_CLK_CTL, 0x08, 0x00);
 		break;