ASoC: wcd937x: Fix audio distortion issue during headset record

Audio is distorted during first 3 secs on headset record
while doing device switch from dmic to headset mic.
Disable BCS before slow insertion detection and enable it
afterwards to resolve the issue.

Change-Id: Icb18a0b5decb0c0bd9959bce7cced70a27566d41
Signed-off-by: Vatsal Bucha <[email protected]>

asoc/codecs/wcd937x/internal.h

@@ -133,6 +133,7 @@ enum {
 	WCD_BOLERO_EVT_RX_MUTE = 1,	/* for RX mute/unmute */
 	WCD_BOLERO_EVT_IMPED_TRUE,	/* for imped true */
 	WCD_BOLERO_EVT_IMPED_FALSE,	/* for imped false */
+	WCD_BOLERO_EVT_BCS_CLK_OFF,
 };
 
 enum {
@@ -164,6 +165,9 @@ enum {
 	WCD937X_NUM_IRQS,
 };
 
+extern void wcd937x_disable_bcs_before_slow_insert(
+				struct snd_soc_component *component,
+				bool bcs_disable);
 extern struct wcd937x_mbhc *wcd937x_soc_get_mbhc(
 				struct snd_soc_component *component);
 extern int wcd937x_mbhc_micb_adjust_voltage(struct snd_soc_component *component,

asoc/codecs/wcd937x/wcd937x-mbhc.c

@@ -810,6 +810,15 @@ static void wcd937x_mbhc_moisture_polling_ctrl(struct wcd_mbhc *mbhc,
 			0x04, (enable << 2));
 }
 
+static void wcd937x_mbhc_bcs_enable(struct wcd_mbhc *mbhc,
+						  bool bcs_enable)
+{
+	if (bcs_enable)
+		wcd937x_disable_bcs_before_slow_insert(mbhc->component, false);
+	else
+		wcd937x_disable_bcs_before_slow_insert(mbhc->component, true);
+}
+
 static const struct wcd_mbhc_cb mbhc_cb = {
 	.request_irq = wcd937x_mbhc_request_irq,
 	.irq_control = wcd937x_mbhc_irq_control,
@@ -834,6 +843,7 @@ static const struct wcd_mbhc_cb mbhc_cb = {
 	.mbhc_get_moisture_status = wcd937x_mbhc_get_moisture_status,
 	.mbhc_moisture_polling_ctrl = wcd937x_mbhc_moisture_polling_ctrl,
 	.mbhc_moisture_detect_en = wcd937x_mbhc_moisture_detect_en,
+	.bcs_enable = wcd937x_mbhc_bcs_enable,
 };
 
 static int wcd937x_get_hph_type(struct snd_kcontrol *kcontrol,

asoc/codecs/wcd937x/wcd937x.c

@@ -1517,6 +1517,21 @@ int wcd937x_micbias_control(struct snd_soc_component *component,
 }
 EXPORT_SYMBOL(wcd937x_micbias_control);
 
+void wcd937x_disable_bcs_before_slow_insert(struct snd_soc_component *component,
+					    bool bcs_disable)
+{
+	struct wcd937x_priv *wcd937x = snd_soc_component_get_drvdata(component);
+
+	if (wcd937x->update_wcd_event) {
+		if (bcs_disable)
+			wcd937x->update_wcd_event(wcd937x->handle,
+						WCD_BOLERO_EVT_BCS_CLK_OFF, 0);
+		else
+			wcd937x->update_wcd_event(wcd937x->handle,
+						WCD_BOLERO_EVT_BCS_CLK_OFF, 1);
+	}
+}
+
 static int wcd937x_get_logical_addr(struct swr_device *swr_dev)
 {
 	int ret = 0;