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 <katkam@codeaurora.org>

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)
 {