Merge "st-hal: Fix pcm NULL dereference"
diff --git a/sound_trigger_hw.c b/sound_trigger_hw.c
index 11b7274..9a81ec9 100644
--- a/sound_trigger_hw.c
+++ b/sound_trigger_hw.c
@@ -746,7 +746,7 @@
 {
     struct listnode *p_ses_node = NULL;
     st_session_t *p_ses = NULL;
-    bool conc_allowed = false;
+    bool conc_allowed = false, lpi_changed = false, barge_in_mode = false;
     unsigned int num_sessions = 0;
 
     ALOGV_IF(config != NULL, "%s: Enter, event type = %d, audio device = %d",
@@ -836,6 +836,8 @@
                 p_ses = node_to_item(p_ses_node, st_session_t, list_node);
                 st_session_pause(p_ses);
             }
+            pthread_mutex_unlock(&stdev->lock);
+            return;
         } else {
             if (event_type == AUDIO_EVENT_CAPTURE_DEVICE_INACTIVE) {
                 list_for_each(p_ses_node, &stdev->sound_model_list) {
@@ -863,26 +865,49 @@
      * configuration which will be used during device backend setting as part
      * of session's start/resume.
      */
-    stdev->lpi_enable = st_hw_check_lpi_support(stdev, p_ses);
+    barge_in_mode = stdev->barge_in_mode;
+    st_hw_check_and_update_lpi(stdev, p_ses);
+    lpi_changed = stdev->lpi_enable != platform_get_lpi_mode(stdev->platform);
     stdev->vad_enable = st_hw_check_vad_support(stdev, p_ses, stdev->lpi_enable);
 
-    if (stdev->lpi_enable != platform_get_lpi_mode(stdev->platform) &&
+    /*
+     * Usecase 1: Playback enabled without display on/battery charging:
+     *            lpi_changed = true, so transition occurs.
+     * Usecase 2: Playback enabled with display on/battery charging:
+     *            lpi_changed = false, and barge_in_mode changes from false to
+     *            true. Dynamic EC update or transition will occur depending
+     *            on the flag.
+     * Usecase 3: Playback disabled without display on/battery charging:
+     *            lpi_changed = true, so transition occurs.
+     * Usecase 4: Playback disabled with display on/battery charging:
+     *            lpi_changed = false, and barge_in_mode changes from true to
+     *            false. Dynamic EC update or transition will occur depending
+     *            on the flag.
+     */
+    if ((lpi_changed || barge_in_mode != stdev->barge_in_mode) &&
         !is_any_session_buffering()) {
-        list_for_each(p_ses_node, &stdev->sound_model_list) {
-            p_ses = node_to_item(p_ses_node, st_session_t, list_node);
-            if (p_ses && p_ses->exec_mode == ST_EXEC_MODE_ADSP) {
-                ALOGD("%s:[%d] LPI: pause SVA session",
-                    __func__, p_ses->sm_handle);
-                st_session_pause(p_ses);
+        if (!lpi_changed && stdev->support_dynamic_ec_update) {
+            platform_stdev_update_ec_effect(stdev->platform,
+                stdev->barge_in_mode);
+        } else {
+            list_for_each(p_ses_node, &stdev->sound_model_list) {
+                p_ses = node_to_item(p_ses_node, st_session_t, list_node);
+                if (p_ses && p_ses->exec_mode == ST_EXEC_MODE_ADSP) {
+                    ALOGD("%s:[%d] LPI: pause SVA session",
+                        __func__, p_ses->sm_handle);
+                    st_session_pause(p_ses);
+                }
             }
-        }
-        platform_stdev_reset_backend_cfg(stdev->platform);
-        list_for_each(p_ses_node, &stdev->sound_model_list) {
-            p_ses = node_to_item(p_ses_node, st_session_t, list_node);
-            if (p_ses && p_ses->exec_mode == ST_EXEC_MODE_ADSP) {
-                ALOGD("%s:[%d] LPI: resume SVA session",
-                    __func__, p_ses->sm_handle);
-                st_session_resume(p_ses);
+
+            platform_stdev_reset_backend_cfg(stdev->platform);
+
+            list_for_each(p_ses_node, &stdev->sound_model_list) {
+                p_ses = node_to_item(p_ses_node, st_session_t, list_node);
+                if (p_ses && p_ses->exec_mode == ST_EXEC_MODE_ADSP) {
+                    ALOGD("%s:[%d] LPI: resume SVA session",
+                        __func__, p_ses->sm_handle);
+                    st_session_resume(p_ses);
+                }
             }
         }
     }
@@ -1088,6 +1113,50 @@
     ALOGV("%s: Exit", __func__);
 }
 
+static void handle_screen_status_change(audio_event_info_t* config)
+{
+    unsigned int num_sessions = 0;
+    struct listnode *p_ses_node = NULL;
+    st_session_t *p_ses = NULL;
+
+    pthread_mutex_lock(&stdev->lock);
+    stdev->screen_off = config->u.value;
+    ALOGD("%s: screen %s", __func__, stdev->screen_off ? "off" : "on");
+
+    num_sessions = get_num_sessions();
+    if (!num_sessions) {
+        pthread_mutex_unlock(&stdev->lock);
+        return;
+    }
+
+    st_hw_check_and_update_lpi(stdev, p_ses);
+
+    if (stdev->lpi_enable != platform_get_lpi_mode(stdev->platform) &&
+        !is_any_session_buffering()) {
+        list_for_each(p_ses_node, &stdev->sound_model_list) {
+            p_ses = node_to_item(p_ses_node, st_session_t, list_node);
+            if (p_ses && p_ses->exec_mode == ST_EXEC_MODE_ADSP) {
+                ALOGD("%s:[%d] LPI: pause SVA session",
+                    __func__, p_ses->sm_handle);
+                st_session_pause(p_ses);
+            }
+        }
+
+        platform_stdev_reset_backend_cfg(stdev->platform);
+
+        list_for_each(p_ses_node, &stdev->sound_model_list) {
+            p_ses = node_to_item(p_ses_node, st_session_t, list_node);
+            if (p_ses && p_ses->exec_mode == ST_EXEC_MODE_ADSP) {
+                ALOGD("%s:[%d] LPI: resume SVA session",
+                    __func__, p_ses->sm_handle);
+                st_session_resume(p_ses);
+            }
+        }
+    }
+    pthread_mutex_unlock(&stdev->lock);
+    ALOGV("%s: Exit", __func__);
+}
+
 static void handle_battery_status_change(audio_event_info_t* config)
 {
     unsigned int num_sessions;
@@ -1112,7 +1181,7 @@
      * So check and update the lpi/vad configuration which will be used during
      * device backend setting as part of session's start/resume.
      */
-    stdev->lpi_enable = st_hw_check_lpi_support(stdev, p_ses);
+    st_hw_check_and_update_lpi(stdev, p_ses);
     stdev->vad_enable = st_hw_check_vad_support(stdev, p_ses,
         stdev->lpi_enable);
     if (stdev->lpi_enable != platform_get_lpi_mode(stdev->platform) &&
@@ -1126,7 +1195,9 @@
                 st_session_pause(p_ses);
             }
         }
+
         platform_stdev_reset_backend_cfg(stdev->platform);
+
         list_for_each(p_ses_node, &stdev->sound_model_list) {
             p_ses = node_to_item(p_ses_node, st_session_t, list_node);
             if (p_ses && p_ses->exec_mode == ST_EXEC_MODE_ADSP) {
@@ -2000,7 +2071,7 @@
     }
 
     st_session->sm_type = sound_model->type;
-    stdev->lpi_enable = st_hw_check_lpi_support(stdev, NULL);
+    st_hw_check_and_update_lpi(stdev, NULL);
     st_hw_check_and_set_lpi_mode(st_session);
 
     /* CPE DRAM can only be accessed by single client, i.e. Apps or CPE,
@@ -2169,7 +2240,7 @@
         }
     }
 
-    stdev->lpi_enable = st_hw_check_lpi_support(stdev, NULL);
+    st_hw_check_and_update_lpi(stdev, NULL);
     stdev->vad_enable = st_hw_check_vad_support(stdev, best_ses,
                                                 stdev->lpi_enable);
 
@@ -2406,7 +2477,7 @@
 
     if (ST_EXEC_MODE_ADSP == st_session->exec_mode ||
         ST_EXEC_MODE_ARM == st_session->exec_mode) {
-        stdev->lpi_enable = st_hw_check_lpi_support(stdev, st_session);
+        st_hw_check_and_update_lpi(stdev, st_session);
         stdev->vad_enable = st_hw_check_vad_support(stdev, st_session,
                                                     stdev->lpi_enable);
         int vad_preroll = st_session_get_preroll(st_session);
@@ -3012,6 +3083,15 @@
         handle_battery_status_change(config);
         break;
 
+    case AUDIO_EVENT_SCREEN_STATUS_CHANGED:
+        if (!config) {
+            ALOGE("%s: NULL config for AUDIO_EVENT_SCREEN_STATUS_CHANGED", __func__);
+            ret = -EINVAL;
+            break;
+        }
+        handle_screen_status_change(config);
+        break;
+
     default:
         ALOGW("%s: Unknown event %d", __func__, event);
         break;
diff --git a/sound_trigger_hw.h b/sound_trigger_hw.h
index 5780bc5..4117d32 100644
--- a/sound_trigger_hw.h
+++ b/sound_trigger_hw.h
@@ -261,6 +261,10 @@
     int lpma_handle;
     bool is_charging;
     bool enable_debug_dumps;
+    bool support_barge_in_mode;
+    bool support_dynamic_ec_update;
+    bool screen_off;
+    bool barge_in_mode;
 };
 
 typedef struct sound_trigger_device sound_trigger_device_t;
diff --git a/sound_trigger_platform.c b/sound_trigger_platform.c
index fade7ad..1f16826 100644
--- a/sound_trigger_platform.c
+++ b/sound_trigger_platform.c
@@ -140,6 +140,8 @@
 #define ST_PARAM_KEY_TRANSIT_TO_NON_LPI_ON_BATTERY_CHARGING \
     "transit_to_non_lpi_on_battery_charging"
 #define ST_PARAM_KEY_PLATFORM_LPI_ENABLE "platform_lpi_enable"
+#define ST_PARAM_KEY_SUPPORT_BARGE_IN_MODE \
+    "support_non_lpi_without_ec"
 #define ST_PARAM_KEY_TRANSIT_WAIT_TIME "transit_wait_time"
 #define ST_PARAM_KEY_SPLIT_EC_REF_DATA "split_ec_ref_data"
 #define ST_PARAM_KEY_EC_REF_CHANNEL_COUNT "ec_ref_channel_count"
@@ -400,7 +402,6 @@
 
     char backend_port[ST_BACKEND_PORT_NAME_MAX_SIZE];
     st_codec_backend_cfg_t codec_backend_cfg;
-    bool ec_ref_enabled;
     char ec_ref_mixer_path[ST_MAX_LENGTH_MIXER_CONTROL];
     int bad_mic_channel_index;
 
@@ -739,10 +740,11 @@
     stdev->dedicated_headset_path = true;
     stdev->disable_hwmad = false;
     stdev->platform_lpi_enable = ST_PLATFORM_LPI_NONE;
+    stdev->screen_off = true;
+    stdev->support_dynamic_ec_update = true;
 
     platform->cpe_fe_to_be_fixed = true;
     platform->bad_mic_channel_index = 0;
-    platform->ec_ref_enabled = false;
     platform->be_dai_name_table = NULL;
     platform->max_be_dai_names = 0;
     platform->lpma_cfg.num_bb_ids = 0;
@@ -1059,6 +1061,14 @@
             ST_PLATFORM_LPI_DISABLE;
     }
 
+    err = str_parms_get_str(parms, ST_PARAM_KEY_SUPPORT_BARGE_IN_MODE,
+                            str_value, sizeof(str_value));
+    if (err >= 0) {
+        str_parms_del(parms, ST_PARAM_KEY_SUPPORT_BARGE_IN_MODE);
+        stdev->support_barge_in_mode =
+            !strncasecmp(str_value, "true", 4) ? true : false;
+    }
+
     err = str_parms_get_int(parms, ST_PARAM_KEY_TRANSIT_WAIT_TIME, &value);
     if (err >= 0) {
         str_parms_del(parms, ST_PARAM_KEY_TRANSIT_WAIT_TIME);
@@ -2232,12 +2242,28 @@
                                 str_value, sizeof(str_value));
         if (err >= 0) {
             str_parms_del(parms, ST_PARAM_KEY_LPI_MODE);
-            if (!strncasecmp(str_value, "NON_LPI", sizeof("NON_LPI")))
+            /*
+             * The default setting will have 2 lsm_usecases in the xml -
+             * lpi_mode LPI and NON_LPI_BARGE_IN. With this configuration,
+             * dynamic EC updates are supported when barge_in_mode is enabled
+             * or disabled. If a third lsm_usecase is present in the xml with
+             * lpi_mode NON_LPI, then transitions will occur when barge_in_mode
+             * is enabled or disabled. This allows for different number of MICs
+             * between non-LPI with barge-in and non-LPI without barge-in.
+             */
+            if (!strncasecmp(str_value, "NON_LPI",
+                sizeof("NON_LPI"))) {
                 lsm_params->lpi_enable = ST_PLATFORM_LPI_DISABLE;
-            else if (!strncasecmp(str_value, "LPI", sizeof("LPI")))
+                my_data->stdev->support_dynamic_ec_update = false;
+            } else if (!strncasecmp(str_value, "NON_LPI_BARGE_IN",
+                sizeof("NON_LPI_BARGE_IN"))) {
+                lsm_params->lpi_enable = ST_PLATFORM_LPI_DISABLE_AND_BARGE_IN;
+            } else if (!strncasecmp(str_value, "LPI", sizeof("LPI"))) {
                 lsm_params->lpi_enable = ST_PLATFORM_LPI_ENABLE;
-            else
+            } else {
                 ALOGE("%s: invalid lpi_mode set: %s", __func__, str_value);
+                goto err_exit;
+            }
         }
     }
 
@@ -5005,6 +5031,7 @@
     struct platform_data *my_data = (struct platform_data *)platform;
     audio_devices_t capture_device =
         platform_stdev_get_capture_device(platform);
+    sound_trigger_device_t *stdev = my_data->stdev;
 
     ALOGV("%s: Enter", __func__);
 
@@ -5023,12 +5050,32 @@
         usecase = node_to_item(lsm_node, struct st_lsm_params, list_node);
         if (usecase->exec_mode == exec_mode) {
             if (my_data->xml_version >= PLATFORM_XML_VERSION_0x0105) {
+                /*
+                 * When the capture device matches, the lsm_usecase with the
+                 * following lpi_mode will be selected:
+                 *
+                 * ST_PLATFORM_LPI_NONE, when no lpi_mode is present.
+                 *
+                 * ST_PLATFORM_LPI_ENABLE, when lpi_enable is true.
+                 *
+                 * ST_PLATFORM_LPI_DISABLE_AND_BARGE_IN, when lpi_enable is
+                 * false and either no lsm_usecase with ST_PLATFORM_LPI_DISABLE
+                 * is present or barge_in_mode is active.
+                 *
+                 * ST_PLATFORM_LPI_DISABLE, when lpi_enable is false and an
+                 * lsm_usecase with this lpi_mode is present and barge_in_mode
+                 * is inactive.
+                 */
                 if (capture_device == usecase->capture_device &&
                     (usecase->lpi_enable == ST_PLATFORM_LPI_NONE ||
-                     (lpi_enable && usecase->lpi_enable ==
-                      ST_PLATFORM_LPI_ENABLE) ||
-                     (!lpi_enable && usecase->lpi_enable ==
-                      ST_PLATFORM_LPI_DISABLE))) {
+                     (usecase->lpi_enable == ST_PLATFORM_LPI_ENABLE &&
+                      lpi_enable) ||
+                     (usecase->lpi_enable ==
+                      ST_PLATFORM_LPI_DISABLE_AND_BARGE_IN && !lpi_enable &&
+                      (stdev->support_dynamic_ec_update ||
+                       stdev->barge_in_mode)) ||
+                     (usecase->lpi_enable == ST_PLATFORM_LPI_DISABLE &&
+                      !lpi_enable && !stdev->barge_in_mode))) {
                     *lsm_usecase = usecase;
                     v_info->in_channels = usecase->in_channels;
                     v_info->fluence_type = usecase->fluence_type;
@@ -5382,6 +5429,38 @@
         strlcat(ec_ref_mixer_path, " line",  DEVICE_NAME_MAX_SIZE);
 }
 
+int platform_stdev_update_ec_effect
+(
+    void *platform,
+    bool enable_ec
+)
+{
+    struct platform_data *my_data = (struct platform_data *)platform;
+    sound_trigger_device_t *stdev = my_data->stdev;
+    struct mixer_ctl *ctl = NULL;
+    const char *mixer_ctl_name = "FFECNS Effect";
+    int status = 0;
+
+    ALOGD("%s: Turning %s EC effect", __func__, enable_ec ? "on" : "off");
+
+    ctl = mixer_get_ctl_by_name(stdev->mixer, mixer_ctl_name);
+    if (!ctl) {
+        ALOGE("%s: ERROR. Could not get ctl for mixer cmd - %s",
+        __func__, mixer_ctl_name);
+        return -EINVAL;
+    }
+
+    if (enable_ec)
+        status = mixer_ctl_set_enum_by_string(ctl, "ECNS");
+    else
+        status = mixer_ctl_set_enum_by_string(ctl, "NS_ONLY");
+
+    if (status)
+        ALOGE("%s: ERROR. Mixer ctl set failed", __func__);
+
+    return status;
+}
+
 void platform_stdev_send_ec_ref_cfg
 (
    void *platform,
@@ -5391,13 +5470,12 @@
 {
     struct platform_data *my_data = (struct platform_data *)platform;
     sound_trigger_device_t *stdev = my_data->stdev;
-    struct sound_trigger_event_info event_info;
+    struct sound_trigger_event_info event_info = {{0}, 0};
 
     if (is_ec_profile(profile_type)) {
         event_info.st_ec_ref_enabled = enable;
         if (enable) {
             stdev->audio_hal_cb(ST_EVENT_UPDATE_ECHO_REF, &event_info);
-            my_data->ec_ref_enabled = enable;
             strlcpy(my_data->ec_ref_mixer_path, "echo-reference",
                     sizeof(my_data->ec_ref_mixer_path));
 
@@ -5412,15 +5490,10 @@
             stdev->audio_hal_cb(ST_EVENT_UPDATE_ECHO_REF, &event_info);
             /* avoid disabling echo if audio hal has enabled echo ref */
             if (!stdev->audio_ec_enabled) {
-                if (my_data->ec_ref_enabled) {
-                    ALOGD("%s: reset echo ref %s", __func__,
-                            my_data->ec_ref_mixer_path);
-                    audio_route_reset_and_update_path(stdev->audio_route,
-                            my_data->ec_ref_mixer_path);
-                    my_data->ec_ref_enabled = enable;
-                } else {
-                    ALOGD("%s: EC Reference is already disabled", __func__);
-                }
+                ALOGD("%s: reset echo ref %s", __func__,
+                    my_data->ec_ref_mixer_path);
+                audio_route_reset_and_update_path(stdev->audio_route,
+                        my_data->ec_ref_mixer_path);
             } else {
                 ALOGD("%s: audio hal has already enabled EC", __func__);
             }
diff --git a/sound_trigger_platform.h b/sound_trigger_platform.h
index cd415ac..4d976cf 100644
--- a/sound_trigger_platform.h
+++ b/sound_trigger_platform.h
@@ -279,7 +279,8 @@
 typedef enum {
     ST_PLATFORM_LPI_NONE,
     ST_PLATFORM_LPI_ENABLE,
-    ST_PLATFORM_LPI_DISABLE
+    ST_PLATFORM_LPI_DISABLE,
+    ST_PLATFORM_LPI_DISABLE_AND_BARGE_IN
 } st_platform_lpi_enable_t;
 
 struct st_lsm_params {
@@ -616,6 +617,12 @@
    st_profile_type_t profile_type
 );
 
+int platform_stdev_update_ec_effect
+(
+    void *platform,
+    bool enable_ec
+);
+
 void platform_stdev_send_ec_ref_cfg
 (
    void *platform,
diff --git a/sound_trigger_prop_intf.h b/sound_trigger_prop_intf.h
index 6d8f039..7ad34dc 100644
--- a/sound_trigger_prop_intf.h
+++ b/sound_trigger_prop_intf.h
@@ -73,7 +73,8 @@
     AUDIO_EVENT_CAPTURE_STREAM_ACTIVE,
     AUDIO_EVENT_BATTERY_STATUS_CHANGED,
     AUDIO_EVENT_GET_PARAM,
-    AUDIO_EVENT_UPDATE_ECHO_REF
+    AUDIO_EVENT_UPDATE_ECHO_REF,
+    AUDIO_EVENT_SCREEN_STATUS_CHANGED
 };
 typedef enum audio_event_type audio_event_type_t;
 
diff --git a/st_hw_common.c b/st_hw_common.c
index 14230c4..3c31a2c 100644
--- a/st_hw_common.c
+++ b/st_hw_common.c
@@ -180,7 +180,7 @@
     return true;
 }
 
-bool st_hw_check_lpi_support
+void st_hw_check_and_update_lpi
 (
     struct sound_trigger_device *stdev,
     st_session_t *st_ses
@@ -189,29 +189,34 @@
     st_session_t *ses = NULL;
     struct listnode *ses_node = NULL;
 
+    stdev->lpi_enable = false;
+    stdev->barge_in_mode = true;
     /*
      * ST_PLATFORM_LPI_NONE is used for backward compatibility. With this
      * setting, the st_vendor_uuid->lpi_enable flag will be used.
      */
     if (stdev->platform_lpi_enable == ST_PLATFORM_LPI_DISABLE) {
         ALOGD("%s: lpi NOT enabled in platform setting", __func__);
-        return false;
+        return;
     } else if ((stdev->platform_lpi_enable == ST_PLATFORM_LPI_NONE) &&
                st_ses && !st_ses->vendor_uuid_info->lpi_enable) {
         ALOGD("%s: lpi NOT enabled for ses %d", __func__, st_ses->sm_handle);
-        return false;
+        return;
     }
 
-    if (stdev->rx_concurrency_active || stdev->tx_concurrency_active) {
+    if (stdev->rx_concurrency_active || stdev->conc_voice_active ||
+        stdev->conc_voip_active) {
         ALOGD("%s: lpi NOT supported due to concurrency", __func__);
-        return false;
+        return;
     }
 
     if (stdev->is_charging &&
         stdev->transit_to_non_lpi_on_battery_charging) {
         ALOGD("%s: lpi NOT supported. battery status %d", __func__,
             stdev->is_charging);
-        return false;
+        if (stdev->support_barge_in_mode)
+            stdev->barge_in_mode = false;
+        return;
     }
 
     list_for_each(ses_node, &stdev->sound_model_list) {
@@ -220,14 +225,23 @@
         if (ses->client_req_det_mode == ST_DET_HIGH_PERF_MODE) {
             ALOGD("%s:[%d] lpi NOT supported due to high perf mode", __func__,
                 ses->sm_handle);
-            return false;
+            if (stdev->support_barge_in_mode)
+                stdev->barge_in_mode = false;
+            return;
         }
     }
 
+    if (!stdev->screen_off && stdev->support_barge_in_mode) {
+        ALOGD("%s: lpi NOT supported. Screen is on", __func__);
+        stdev->barge_in_mode = false;
+        return;
+    }
+
     if (stdev->platform_lpi_enable == ST_PLATFORM_LPI_NONE)
-        return is_projected_lpi_budget_available(stdev, st_ses);
+        stdev->lpi_enable = is_projected_lpi_budget_available(stdev, st_ses);
     else
-        return true;
+        stdev->lpi_enable = true;
+    stdev->barge_in_mode = !stdev->lpi_enable;
 }
 
 bool st_hw_check_vad_support
@@ -295,6 +309,8 @@
                 is_projected_lpi_budget_available(st_ses->stdev, stc_ses));
         } else {
             st_ses->hw_ses_adsp->lpi_enable = st_ses->stdev->lpi_enable;
+            st_ses->hw_ses_adsp->barge_in_mode =
+                st_ses->stdev->barge_in_mode;
         }
     }
     pthread_mutex_unlock(&st_ses->lock);
diff --git a/st_hw_common.h b/st_hw_common.h
index 6fb9548..6f822ea 100644
--- a/st_hw_common.h
+++ b/st_hw_common.h
@@ -35,7 +35,7 @@
 #include "st_session.h"
 
 bool st_hw_check_ses_ss_usecase_allowed(st_session_t *st_ses);
-bool st_hw_check_lpi_support(struct sound_trigger_device *stdev, st_session_t *st_ses);
+void st_hw_check_and_update_lpi(struct sound_trigger_device *stdev, st_session_t *st_ses);
 bool st_hw_check_vad_support(struct sound_trigger_device *stdev, st_session_t *st_ses, bool lpi_enable);
 void st_hw_check_and_set_lpi_mode(st_session_t *st_ses);
 bool st_hw_check_multi_stage_lsm_support();
diff --git a/st_hw_session.h b/st_hw_session.h
index 6c61bee..4a8218d 100644
--- a/st_hw_session.h
+++ b/st_hw_session.h
@@ -106,6 +106,7 @@
     bool is_generic_event;
     struct listnode lsm_ss_cfg_list;
     bool lpi_enable;
+    bool barge_in_mode;
     bool lab_enabled;
 
     int rc_config_update_counter;
diff --git a/st_hw_session_lsm.c b/st_hw_session_lsm.c
index d68a662..ec2a63b 100644
--- a/st_hw_session_lsm.c
+++ b/st_hw_session_lsm.c
@@ -2505,6 +2505,16 @@
         goto error_exit;
     }
 
+    if (!p_ses->stdev->lpi_enable && !p_ses->stdev->barge_in_mode) {
+        status = platform_stdev_update_ec_effect(p_ses->stdev->platform,
+            false);
+        if (status) {
+            ALOGE("%s: ERROR. Failed to update EC ref, returned status %d",
+                  __func__, status);
+            goto error_exit_1;
+        }
+    }
+
     /* SVA doesn't support per keyword recogntion mode.
        Use the per soundmodel recognition mode */
     if (recognition_mode & RECOGNITION_MODE_VOICE_TRIGGER){
@@ -3927,6 +3937,16 @@
         goto exit_1;
     }
 
+    if (!p_ses->stdev->lpi_enable && !p_ses->stdev->barge_in_mode) {
+        status = platform_stdev_update_ec_effect(p_ses->stdev->platform,
+            false);
+        if (status) {
+            ALOGE("%s: ERROR. Failed to update EC ref, %d",
+                  __func__, status);
+            goto exit_2;
+        }
+    }
+
     status = ape_start(p_ses);
     if (status)
         goto exit_2;
diff --git a/st_session.c b/st_session.c
index 8dd1bae..b946f5f 100644
--- a/st_session.c
+++ b/st_session.c
@@ -2453,10 +2453,14 @@
      * It is possible the BE LPI mode has been updated, but not the FE mode.
      * DSP requires both FE and BE to be in the same mode for any configuration
      * changes between LPI and non-LPI switch, so update the FE mode to the
-     * same as BE mode by re-opening LSM session.
+     * same as BE mode by re-opening LSM session. This is also used for
+     * other transition usecases which require dereg_sm and reg_sm.
      */
-    if (hw_ses->lpi_enable != hw_ses->stdev->lpi_enable) {
+    if (hw_ses->lpi_enable != hw_ses->stdev->lpi_enable ||
+        (hw_ses->barge_in_mode != hw_ses->stdev->barge_in_mode &&
+         !hw_ses->stdev->support_dynamic_ec_update)) {
         hw_ses->lpi_enable = hw_ses->stdev->lpi_enable;
+        hw_ses->barge_in_mode = hw_ses->stdev->barge_in_mode;
         if (!load_sm) {
             load_sm = true;
             status = hw_ses->fptrs->dereg_sm(hw_ses);
@@ -4188,8 +4192,35 @@
 
     case ST_SES_EV_RESUME:
         stc_ses->paused = false;
-        if (!is_any_client_in_state(st_ses, ST_STATE_ACTIVE))
+        if (!is_any_client_in_state(st_ses, ST_STATE_ACTIVE)) {
+            /*
+             * When a transition is needed due to lpi mode or barge-in mode,
+             * call dereg_sm and reg_sm to select the updated lsm_usecase.
+             */
+            if (hw_ses->lpi_enable != hw_ses->stdev->lpi_enable ||
+                (hw_ses->barge_in_mode != hw_ses->stdev->barge_in_mode &&
+                 !hw_ses->stdev->support_dynamic_ec_update)) {
+
+                hw_ses->lpi_enable = hw_ses->stdev->lpi_enable;
+                hw_ses->barge_in_mode = hw_ses->stdev->barge_in_mode;
+
+                status = hw_ses->fptrs->dereg_sm(hw_ses);
+                if (status) {
+                    ALOGE("%s:[%d] failed to dereg_sm err %d", __func__,
+                        st_ses->sm_handle, status);
+                    break;
+                }
+
+                status = hw_ses->fptrs->reg_sm(hw_ses, st_ses->sm_info.sm_data,
+                    st_ses->sm_info.sm_size, st_ses->sm_info.sm_type);
+                if (status) {
+                    ALOGE("%s:[%d] failed to reg_sm err %d", __func__,
+                        st_ses->sm_handle, status);
+                    STATE_TRANSITION(st_ses, idle_state_fn);
+                }
+            }
             break;
+        }
         /* Fall through */
     case ST_SES_EV_START:
     case ST_SES_EV_RESTART: