audio-kernel: wcd: Disable 1M Pull-up resistor

1M Pull-up resistor within WCD causes LPD (Liquid Presence
Detection) failures. So add support for disabling 1Mohm
Pull-up resistor. Re-enable it whenever wcd enters into
audio mode.

Change-Id: Ib3115315bc61d4e6126ddf688653182417d5d54d
Signed-off-by: Phani Kumar Uppalapati <[email protected]>

asoc/codecs/wcd-mbhc-v2.c

@@ -963,10 +963,15 @@ static bool wcd_mbhc_moisture_detect(struct wcd_mbhc *mbhc, bool detection_type)
 	return ret;
 }
 
-static void wcd_mbhc_set_hsj_connect(struct snd_soc_component *component, bool connect)
+static void wcd_mbhc_set_hsj_connect(struct wcd_mbhc *mbhc, bool connect)
 {
+	struct snd_soc_component *component = mbhc->component;
+
 #if IS_ENABLED(CONFIG_QCOM_WCD_USBSS_I2C)
 	if (connect) {
+		if (mbhc->mbhc_cb && mbhc->mbhc_cb->zdet_leakage_resistance)
+			mbhc->mbhc_cb->zdet_leakage_resistance(mbhc, false); /* enable 1M pull-up */
+
 		if (of_find_property(component->card->dev->of_node,
 					"qcom,usbss-hsj-connect-enabled", NULL))
 			wcd_usbss_switch_update(WCD_USBSS_HSJ_CONNECT, WCD_USBSS_CABLE_CONNECT);
@@ -974,6 +979,9 @@ static void wcd_mbhc_set_hsj_connect(struct snd_soc_component *component, bool c
 		if (of_find_property(component->card->dev->of_node,
 					"qcom,usbss-hsj-connect-enabled", NULL))
 			wcd_usbss_switch_update(WCD_USBSS_HSJ_CONNECT, WCD_USBSS_CABLE_DISCONNECT);
+
+		if (mbhc->mbhc_cb && mbhc->mbhc_cb->zdet_leakage_resistance)
+			mbhc->mbhc_cb->zdet_leakage_resistance(mbhc, true); /* disable 1M pull-up */
 	}
 #endif
 }
@@ -1019,7 +1027,7 @@ static void wcd_mbhc_swch_irq_handler(struct wcd_mbhc *mbhc)
 	if ((mbhc->current_plug == MBHC_PLUG_TYPE_NONE) &&
 	    detection_type) {
 
-		wcd_mbhc_set_hsj_connect(component, 1);
+		wcd_mbhc_set_hsj_connect(mbhc, 1);
 		/* If moisture is present, then enable polling, disable
 		 * moisture detection and wait for interrupt
 		 */
@@ -1135,7 +1143,7 @@ static void wcd_mbhc_swch_irq_handler(struct wcd_mbhc *mbhc)
 				mbhc->mbhc_cb->mbhc_moisture_detect_en(mbhc,
 									false);
 		}
-		wcd_mbhc_set_hsj_connect(component, 0);
+		wcd_mbhc_set_hsj_connect(mbhc, 0);
 
 	} else if (!detection_type) {
 		/* Disable external voltage source to micbias if present */

asoc/codecs/wcd939x/wcd939x-mbhc.c

@@ -1344,6 +1344,17 @@ static void wcd939x_surge_reset_routine(struct wcd_mbhc *mbhc)
 	regcache_sync(wcd939x->regmap);
 }
 
+static void wcd939x_mbhc_zdet_leakage_resistance(struct wcd_mbhc *mbhc,
+							bool enable)
+{
+	if (enable)
+		snd_soc_component_update_bits(mbhc->component, WCD939X_ZDET_BIAS_CTL,
+				0x80, 0x80); /* disable 1M pull-up */
+	else
+		snd_soc_component_update_bits(mbhc->component, WCD939X_ZDET_BIAS_CTL,
+				0x80, 0x00); /* enable 1M pull-up */
+}
+
 static const struct wcd_mbhc_cb mbhc_cb = {
 	.request_irq = wcd939x_mbhc_request_irq,
 	.irq_control = wcd939x_mbhc_irq_control,
@@ -1370,6 +1381,7 @@ static const struct wcd_mbhc_cb mbhc_cb = {
 	.mbhc_moisture_detect_en = wcd939x_mbhc_moisture_detect_en,
 	.bcs_enable = wcd939x_mbhc_bcs_enable,
 	.surge_reset_routine = wcd939x_surge_reset_routine,
+	.zdet_leakage_resistance = wcd939x_mbhc_zdet_leakage_resistance,
 };
 
 static int wcd939x_get_hph_type(struct snd_kcontrol *kcontrol,

asoc/codecs/wcd939x/wcd939x.c

@@ -443,6 +443,11 @@ static int wcd939x_init_reg(struct snd_soc_component *component)
 	if (wcd939x->version != WCD939X_VERSION_2_0)
 		snd_soc_component_write(component, WCD939X_CFG0, 0x05);
 
+	/*
+	 * Disable 1M pull-up by default during boot by writing 0b1 to bit[7].
+	 * This gets re-enabled when headset is inserted.
+	 */
+	snd_soc_component_update_bits(component, WCD939X_ZDET_BIAS_CTL, 0x80, 0x80);
 	return 0;
 }
 

include/asoc/wcd-mbhc-v2.h

@@ -531,6 +531,7 @@ struct wcd_mbhc_cb {
 	void (*mbhc_moisture_polling_ctrl)(struct wcd_mbhc *mbhc, bool enable);
 	void (*mbhc_moisture_detect_en)(struct wcd_mbhc *mbhc, bool enable);
 	void (*surge_reset_routine)(struct wcd_mbhc *mbhc);
+	void (*zdet_leakage_resistance)(struct wcd_mbhc *mbhc, bool enable);
 };
 
 struct wcd_mbhc_fn {