asoc: wcd938x: Enable watchdog interrupt

Handle PDM watchdog interrupt. Enable watchdog
before analog PA is enabled and disable it
after analog PA is disabled so as to prevent false alarms.

Change-Id: Id45dee1a150c471d1bb29b9bfed9f416b8454a5f
Signed-off-by: Karthikeyan Mani <[email protected]>

asoc/codecs/wcd938x/internal.h

@@ -95,6 +95,7 @@ struct wcd938x_priv {
 	struct snd_info_entry *entry;
 	struct snd_info_entry *version_entry;
 	int flyback_cur_det_disable;
+	int ear_rx_path;
 };
 
 struct wcd938x_micbias_setting {

asoc/codecs/wcd938x/wcd938x.c

@@ -29,6 +29,7 @@
 
 #define WCD938X_VERSION_1_0 1
 #define WCD938X_VERSION_ENTRY_SIZE 32
+#define EAR_RX_PATH_AUX 1
 
 #define ADC_MODE_VAL_HIFI     0x01
 #define ADC_MODE_VAL_LO_HIF   0x02
@@ -629,6 +630,8 @@ static int wcd938x_codec_enable_hphr_pa(struct snd_soc_dapm_widget *w,
 		/* 100 usec delay as per HW requirement */
 		usleep_range(100, 110);
 		set_bit(HPH_PA_DELAY, &wcd938x->status_mask);
+		snd_soc_component_update_bits(component,
+				WCD938X_DIGITAL_PDM_WD_CTL1, 0x17, 0x13);
 		break;
 	case SND_SOC_DAPM_POST_PMU:
 		/*
@@ -666,6 +669,8 @@ static int wcd938x_codec_enable_hphr_pa(struct snd_soc_dapm_widget *w,
 	case SND_SOC_DAPM_POST_PMD:
 		/* 7 msec delay as per HW requirement */
 		usleep_range(7000, 7010);
+		snd_soc_component_update_bits(component,
+				WCD938X_DIGITAL_PDM_WD_CTL1, 0x17, 0x00);
 		blocking_notifier_call_chain(&wcd938x->mbhc->notifier,
 					     WCD_EVENT_POST_HPHR_PA_OFF,
 					     &wcd938x->mbhc->wcd_mbhc);
@@ -706,6 +711,8 @@ static int wcd938x_codec_enable_hphl_pa(struct snd_soc_dapm_widget *w,
 		/* 100 usec delay as per HW requirement */
 		usleep_range(100, 110);
 		set_bit(HPH_PA_DELAY, &wcd938x->status_mask);
+		snd_soc_component_update_bits(component,
+				WCD938X_DIGITAL_PDM_WD_CTL0, 0x17, 0x13);
 		break;
 	case SND_SOC_DAPM_POST_PMU:
 		/*
@@ -743,6 +750,8 @@ static int wcd938x_codec_enable_hphl_pa(struct snd_soc_dapm_widget *w,
 	case SND_SOC_DAPM_POST_PMD:
 		/* 7 msec delay as per HW requirement */
 		usleep_range(7000, 7010);
+		snd_soc_component_update_bits(component,
+				WCD938X_DIGITAL_PDM_WD_CTL0, 0x17, 0x00);
 		blocking_notifier_call_chain(&wcd938x->mbhc->notifier,
 					     WCD_EVENT_POST_HPHL_PA_OFF,
 					     &wcd938x->mbhc->wcd_mbhc);
@@ -775,6 +784,8 @@ static int wcd938x_codec_enable_aux_pa(struct snd_soc_dapm_widget *w,
 		ret = swr_slvdev_datapath_control(wcd938x->rx_swr_dev,
 			    wcd938x->rx_swr_dev->dev_num,
 			    true);
+		snd_soc_component_update_bits(component,
+				WCD938X_DIGITAL_PDM_WD_CTL2, 0x05, 0x05);
 		break;
 	case SND_SOC_DAPM_POST_PMU:
 		/* 1 msec delay as per HW requirement */
@@ -798,6 +809,8 @@ static int wcd938x_codec_enable_aux_pa(struct snd_soc_dapm_widget *w,
 	case SND_SOC_DAPM_POST_PMD:
 		/* 1 msec delay as per HW requirement */
 		usleep_range(1000, 1010);
+		snd_soc_component_update_bits(component,
+				WCD938X_DIGITAL_PDM_WD_CTL2, 0x05, 0x00);
 		wcd_cls_h_fsm(component, &wcd938x->clsh_info,
 			     WCD_CLSH_EVENT_POST_PA,
 			     WCD_CLSH_STATE_AUX,
@@ -831,6 +844,21 @@ static int wcd938x_codec_enable_ear_pa(struct snd_soc_dapm_widget *w,
 		ret = swr_slvdev_datapath_control(wcd938x->rx_swr_dev,
 			    wcd938x->rx_swr_dev->dev_num,
 			    true);
+		/*
+		 * Enable watchdog interrupt for HPHL or AUX
+		 * depending on mux value
+		 */
+		wcd938x->ear_rx_path =
+			snd_soc_component_read32(
+				component, WCD938X_DIGITAL_CDC_EAR_PATH_CTL);
+		if (wcd938x->ear_rx_path & EAR_RX_PATH_AUX)
+			snd_soc_component_update_bits(component,
+					WCD938X_DIGITAL_PDM_WD_CTL2,
+					0x05, 0x05);
+		else
+			snd_soc_component_update_bits(component,
+					WCD938X_DIGITAL_PDM_WD_CTL0,
+					0x17, 0x13);
 		break;
 	case SND_SOC_DAPM_POST_PMU:
 		/* 6 msec delay as per HW requirement */
@@ -854,6 +882,14 @@ static int wcd938x_codec_enable_ear_pa(struct snd_soc_dapm_widget *w,
 	case SND_SOC_DAPM_POST_PMD:
 		/* 7 msec delay as per HW requirement */
 		usleep_range(7000, 7010);
+		if (wcd938x->ear_rx_path & EAR_RX_PATH_AUX)
+			snd_soc_component_update_bits(component,
+					WCD938X_DIGITAL_PDM_WD_CTL2,
+					0x05, 0x00);
+		else
+			snd_soc_component_update_bits(component,
+					WCD938X_DIGITAL_PDM_WD_CTL0,
+					0x17, 0x00);
 		wcd_cls_h_fsm(component, &wcd938x->clsh_info,
 			     WCD_CLSH_EVENT_POST_PA,
 			     WCD_CLSH_STATE_EAR,
@@ -2717,6 +2753,13 @@ struct wcd938x_pdata *wcd938x_populate_dt_data(struct device *dev)
 	return pdata;
 }
 
+static irqreturn_t wcd938x_wd_handle_irq(int irq, void *data)
+{
+	pr_err_ratelimited("%s: Watchdog interrupt for irq =%d triggered\n",
+			   __func__, irq);
+	return IRQ_HANDLED;
+}
+
 static int wcd938x_bind(struct device *dev)
 {
 	int ret = 0, i = 0;
@@ -2780,6 +2823,18 @@ static int wcd938x_bind(struct device *dev)
 	}
 	wcd938x->tx_swr_dev->slave_irq = wcd938x->virq;
 
+	/* Request for watchdog interrupt */
+	wcd_request_irq(&wcd938x->irq_info, WCD938X_IRQ_HPHR_PDM_WD_INT,
+			"HPHR PDM WD INT", wcd938x_wd_handle_irq, NULL);
+	wcd_request_irq(&wcd938x->irq_info, WCD938X_IRQ_HPHL_PDM_WD_INT,
+			"HPHL PDM WD INT", wcd938x_wd_handle_irq, NULL);
+	wcd_request_irq(&wcd938x->irq_info, WCD938X_IRQ_AUX_PDM_WD_INT,
+			"AUX PDM WD INT", wcd938x_wd_handle_irq, NULL);
+	/* Enable watchdog interrupt for HPH and AUX */
+	wcd_enable_irq(&wcd938x->irq_info, WCD938X_IRQ_HPHR_PDM_WD_INT);
+	wcd_enable_irq(&wcd938x->irq_info, WCD938X_IRQ_HPHL_PDM_WD_INT);
+	wcd_enable_irq(&wcd938x->irq_info, WCD938X_IRQ_AUX_PDM_WD_INT);
+
 	ret = snd_soc_register_component(dev, &soc_codec_dev_wcd938x,
 				     NULL, 0);
 	if (ret) {