asoc: wcd938x: stop mbhc during ssr down

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

Change-Id: Iff054cf8b3099959a1be561bd937057258f57b81
Signed-off-by: Meng Wang <mengw@codeaurora.org>

asoc/codecs/wcd938x/wcd938x-mbhc.h

@@ -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.
  */
 #ifndef __WCD938X_MBHC_H__
 #define __WCD938X_MBHC_H__
@@ -20,6 +20,8 @@ extern void wcd938x_mbhc_hs_detect_exit(struct snd_soc_component *component);
 extern int wcd938x_mbhc_hs_detect(struct snd_soc_component *component,
 				struct wcd_mbhc_config *mbhc_cfg);
 extern void wcd938x_mbhc_deinit(struct snd_soc_component *component);
+extern void wcd938x_mbhc_ssr_down(struct wcd938x_mbhc *mbhc,
+				struct snd_soc_component *component);
 extern int wcd938x_mbhc_post_ssr_init(struct wcd938x_mbhc *mbhc,
 				    struct snd_soc_component *component);
 extern int wcd938x_mbhc_get_impedance(struct wcd938x_mbhc *wcd938x_mbhc,
@@ -43,6 +45,10 @@ static inline int wcd938x_mbhc_hs_detect(struct snd_soc_component *component,
 static inline void wcd938x_mbhc_deinit(struct snd_soc_component *component)
 {
 }
+static inline void wcd938x_mbhc_ssr_down(struct wcd938x_mbhc *mbhc,
+					struct snd_soc_component *component)
+{
+}
 static inline int wcd938x_mbhc_post_ssr_init(struct wcd938x_mbhc *mbhc,
 					   struct snd_soc_component *component)
 {