asoc: wcd937x: stop mbhc during ssr down

Stop mbhc operations during ssr down to cancel
any pending detection sequences.

Change-Id: I6aa8c61c2cc74fc08adf57c58673acaa753ac322
Signed-off-by: Ramprasad Katkam <[email protected]>

asoc/codecs/wcd937x/wcd937x-mbhc.c

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0-only
-/* Copyright (c) 2018, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2018-2019, The Linux Foundation. All rights reserved.
  */
 #include <linux/module.h>
 #include <linux/init.h>
@@ -974,6 +974,31 @@ void wcd937x_mbhc_hs_detect_exit(struct snd_soc_component *component)
 }
 EXPORT_SYMBOL(wcd937x_mbhc_hs_detect_exit);
 
+/*
+ * wcd937x_mbhc_ssr_down: stop mbhc during
+ * wcd937x subsystem restart
+ * @mbhc: pointer to wcd937x_mbhc structure
+ * @component: handle to snd_soc_component *
+ */
+void wcd937x_mbhc_ssr_down(struct wcd937x_mbhc *mbhc,
+		         struct snd_soc_component *component)
+{
+	struct wcd_mbhc *wcd_mbhc = NULL;
+
+	if (!mbhc || !component)
+		return;
+
+	wcd_mbhc = &mbhc->wcd_mbhc;
+	if (wcd_mbhc == NULL) {
+		dev_err(component->dev, "%s: wcd_mbhc is NULL\n", __func__);
+		return;
+	}
+
+	wcd937x_mbhc_hs_detect_exit(component);
+	wcd_mbhc_deinit(wcd_mbhc);
+}
+EXPORT_SYMBOL(wcd937x_mbhc_ssr_down);
+
 /*
  * wcd937x_mbhc_post_ssr_init: initialize mbhc for
  * wcd937x post subsystem restart
@@ -997,8 +1022,6 @@ int wcd937x_mbhc_post_ssr_init(struct wcd937x_mbhc *mbhc,
 		return -EINVAL;
 	}
 
-	wcd937x_mbhc_hs_detect_exit(component);
-	wcd_mbhc_deinit(wcd_mbhc);
 	snd_soc_component_update_bits(component, WCD937X_ANA_MBHC_MECH,
 				0x20, 0x20);
 	ret = wcd_mbhc_init(wcd_mbhc, component, &mbhc_cb, &intr_ids,

asoc/codecs/wcd937x/wcd937x-mbhc.h

@@ -1,5 +1,5 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
-/* Copyright (c) 2018, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2018-2019, The Linux Foundation. All rights reserved.
  */
 #ifndef __WCD937X_MBHC_H__
 #define __WCD937X_MBHC_H__
@@ -21,6 +21,8 @@ extern int wcd937x_mbhc_hs_detect(struct snd_soc_component *component,
 extern void wcd937x_mbhc_deinit(struct snd_soc_component *component);
 extern int wcd937x_mbhc_post_ssr_init(struct wcd937x_mbhc *mbhc,
 				    struct snd_soc_component *component);
+extern void wcd937x_mbhc_ssr_down(struct wcd937x_mbhc *mbhc,
+				    struct snd_soc_component *component);
 extern int wcd937x_mbhc_get_impedance(struct wcd937x_mbhc *wcd937x_mbhc,
 				    uint32_t *zl, uint32_t *zr);
 #else
@@ -47,7 +49,11 @@ static inline int wcd937x_mbhc_post_ssr_init(struct wcd937x_mbhc *mbhc,
 {
 	return 0;
 }
-
+static inline void wcd937x_mbhc_ssr_down(struct wcd937x_mbhc *mbhc,
+					   struct snd_soc_component *component)
+{
+	return 0;
+}
 static inline int wcd937x_mbhc_get_impedance(struct wcd937x_mbhc *wcd937x_mbhc,
 					   uint32_t *zl, uint32_t *zr)
 {

asoc/codecs/wcd937x/wcd937x.c

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * Copyright (c) 2018, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2018-2019, The Linux Foundation. All rights reserved.
  */
 
 #include <linux/module.h>
@@ -1422,6 +1422,8 @@ static int wcd937x_event_notify(struct notifier_block *block,
 					0x80, 0x00);
 		break;
 	case BOLERO_WCD_EVT_SSR_DOWN:
+		mbhc = &wcd937x->mbhc->wcd_mbhc;
+		wcd937x_mbhc_ssr_down(wcd937x->mbhc, component);
 		wcd937x_reset_low(wcd937x->dev);
 		break;
 	case BOLERO_WCD_EVT_SSR_UP: