diff --git a/hal/acdb.h b/hal/acdb.h
index 7f5fad7..e0d4628 100644
--- a/hal/acdb.h
+++ b/hal/acdb.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013-2018, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2013-2019, The Linux Foundation. All rights reserved.
  * Not a Contribution.
  *
  * Copyright (C) 2013 The Android Open Source Project
@@ -50,6 +50,7 @@
 typedef int  (*acdb_init_v4_t)(void *, int);
 typedef void (*acdb_send_audio_cal_t)(int, int, int , int);
 typedef void (*acdb_send_audio_cal_v3_t)(int, int, int, int, int);
+typedef void (*acdb_send_audio_cal_v4_t)(int, int, int, int, int, int);
 typedef void (*acdb_send_voice_cal_t)(int, int);
 typedef int (*acdb_reload_vocvoltable_t)(int);
 typedef int  (*acdb_get_default_app_type_t)(void);
diff --git a/hal/msm8974/platform.c b/hal/msm8974/platform.c
index 07d3837..aa6d59b 100644
--- a/hal/msm8974/platform.c
+++ b/hal/msm8974/platform.c
@@ -317,6 +317,7 @@
     acdb_deallocate_t          acdb_deallocate;
     acdb_send_audio_cal_t      acdb_send_audio_cal;
     acdb_send_audio_cal_v3_t   acdb_send_audio_cal_v3;
+    acdb_send_audio_cal_v4_t   acdb_send_audio_cal_v4;
     acdb_set_audio_cal_t       acdb_set_audio_cal;
     acdb_get_audio_cal_t       acdb_get_audio_cal;
     acdb_send_voice_cal_t      acdb_send_voice_cal;
@@ -3259,6 +3260,12 @@
             ALOGE("%s: Could not find the symbol acdb_send_audio_cal_v3 from %s",
                   __func__, LIB_ACDB_LOADER);
 
+        my_data->acdb_send_audio_cal_v4 = (acdb_send_audio_cal_v4_t)dlsym(my_data->acdb_handle,
+                                                    "acdb_loader_send_audio_cal_v4");
+        if (!my_data->acdb_send_audio_cal_v4)
+            ALOGE("%s: Could not find the symbol acdb_send_audio_cal_v4 from %s",
+                  __func__, LIB_ACDB_LOADER);
+
         my_data->acdb_set_audio_cal = (acdb_set_audio_cal_t)dlsym(my_data->acdb_handle,
                                                     "acdb_loader_set_audio_cal_v2");
         if (!my_data->acdb_set_audio_cal)
@@ -4940,6 +4947,7 @@
     bool is_incall_rec_usecase = false;
     snd_device_t incall_rec_device;
     int sample_rate = DEFAULT_OUTPUT_SAMPLING_RATE;
+    struct audio_backend_cfg backend_cfg = {0};
 
     if (voice_is_in_call(my_data->adev))
         is_incall_rec_usecase = voice_is_in_call_rec_stream(usecase->stream.in);
@@ -4978,11 +4986,13 @@
             acdb_dev_id = acdb_device_table[platform_get_spkr_prot_snd_device(new_snd_device[i])];
             sample_rate = audio_extn_utils_get_app_sample_rate_for_device(my_data->adev, usecase,
                                                           new_snd_device[i]);
+            platform_get_codec_backend_cfg(my_data->adev, new_snd_device[i], &backend_cfg);
         } else {
             // Use in_call_rec snd_device to extract the ACDB device ID instead of split snd devices
             acdb_dev_id = acdb_device_table[platform_get_spkr_prot_snd_device(snd_device)];
             sample_rate = audio_extn_utils_get_app_sample_rate_for_device(my_data->adev, usecase,
                                                           snd_device);
+            platform_get_codec_backend_cfg(my_data->adev, snd_device, &backend_cfg);
         }
 
         // Do not use Rx path default app type for TX path
@@ -4991,6 +5001,12 @@
             app_type  = DEFAULT_APP_TYPE_TX_PATH;
         }
 
+        /* Override backend cfg sample rate in calibration for vi feedback usecase */
+        if (usecase->id == USECASE_AUDIO_SPKR_CALIB_TX) {
+            ALOGV("Reset backend cfg sample rate to 8KHz for spkr calib Tx use case");
+            backend_cfg.sample_rate = sample_rate;
+        }
+
         if (acdb_dev_id < 0) {
             ALOGE("%s: Could not find acdb id for device(%d)",
                   __func__, new_snd_device[i]);
@@ -5015,7 +5031,11 @@
         else
             acdb_dev_type = ACDB_DEV_TYPE_IN;
 
-        if (my_data->acdb_send_audio_cal_v3) {
+        if (my_data->acdb_send_audio_cal_v4) {
+            my_data->acdb_send_audio_cal_v4(acdb_dev_id, acdb_dev_type,
+                                            app_type, sample_rate, i,
+                                            backend_cfg.sample_rate);
+        } else if (my_data->acdb_send_audio_cal_v3) {
             my_data->acdb_send_audio_cal_v3(acdb_dev_id, acdb_dev_type,
                                             app_type, sample_rate, i);
         } else if (my_data->acdb_send_audio_cal) {