diff --git a/audio/audio_hw.c b/audio/audio_hw.c
index a62c344..7b66a1a 100644
--- a/audio/audio_hw.c
+++ b/audio/audio_hw.c
@@ -71,7 +71,6 @@
     struct alsa_stream_in *active_input;
     struct alsa_stream_out *active_output;
     bool mic_mute;
-    int hifi_dsp_fd;
 };
 
 struct alsa_stream_out {
@@ -249,7 +248,6 @@
     struct alsa_audio_device *adev = out->dev;
     size_t frame_size = audio_stream_out_frame_size(stream);
     size_t out_frames = bytes / frame_size;
-    struct misc_io_pcm_buf_param pcmbuf;
 
     /* acquiring hw device mutex systematically is useful if a low priority thread is waiting
      * on the output stream mutex - e.g. executing select_mode() while holding the hw device
@@ -268,14 +266,6 @@
 
     pthread_mutex_unlock(&adev->lock);
 
-    if (adev->hifi_dsp_fd >= 0) {
-        pcmbuf.buf = (uint64_t)buffer;
-        pcmbuf.buf_size = bytes;
-        ret = ioctl(adev->hifi_dsp_fd, HIFI_MISC_IOCTL_PCM_GAIN, &pcmbuf);
-        if (ret) {
-            ALOGV("hifi_dsp: Error buffer processing: %d", errno);
-        }
-    }
 
     ret = pcm_mmap_write(out->pcm, buffer, out_frames * frame_size);
     if (ret == 0) {
@@ -638,11 +628,7 @@
 
 static int adev_close(hw_device_t *device)
 {
-    struct alsa_audio_device *adev = (struct alsa_audio_device *)device;
-
     ALOGV("adev_close");
-    if (adev->hifi_dsp_fd >= 0)
-        close(adev->hifi_dsp_fd);
     free(device);
     return 0;
 }
@@ -687,12 +673,6 @@
 
     *device = &adev->hw_device.common;
 
-    adev->hifi_dsp_fd = open(HIFI_DSP_MISC_DRIVER, O_WRONLY, 0);
-    if (adev->hifi_dsp_fd < 0) {
-        ALOGW("hifi_dsp: Error opening device %d", errno);
-    } else {
-        ALOGI("hifi_dsp: Open device");
-    }
     return 0;
 }