Added patch to Ravenna driver to solve a possible corruption issue at the beginning of a playback or recording caused by not initialized buffers.

3rdparty/patches/ravenna-alsa-lkm-init-play-capture-buffers.patch

@@ -0,0 +1,22 @@
+diff --git a/driver/audio_driver.c b/driver/audio_driver.c
+index 3d9debd..339327b 100644
+--- a/driver/audio_driver.c
++++ b/driver/audio_driver.c
+@@ -2441,7 +2142,7 @@ static int mr_alsa_audio_preallocate_memory(struct mr_alsa_audio_chip *chip)
+         printk(KERN_ERR "mr_alsa_audio_preallocate_memory: could not allocate playback buffer (%zd bytes vmalloc requested...\n", wanted);
+         goto _failed;
+     }
+-
++    memset(chip->playback_buffer, 0, wanted);
+
+     wanted = mr_alsa_audio_pcm_hardware_capture.buffer_bytes_max; // MR_ALSA_RINGBUFFER_NB_FRAMES * MR_ALSA_NB_CHANNELS_MAX * 4;
+
+@@ -2452,6 +2153,7 @@ static int mr_alsa_audio_preallocate_memory(struct mr_alsa_audio_chip *chip)
+         printk(KERN_ERR "mr_alsa_audio_preallocate_memory: could not allocate capture buffer (%zd bytes vmalloc requested...\n", wanted);
+         goto _failed;
+     }
++    memset(chip->capture_buffer, 0, wanted);
+     for (i = 0; i < MR_ALSA_NB_CHANNELS_MAX; i++)
+     {
+         chip->capture_buffer_channels_map[i] = (void*)chip->capture_buffer + MR_ALSA_RINGBUFFER_NB_FRAMES * i * 4;
+

build.sh

@@ -24,12 +24,15 @@ if [ ! -d ravenna-alsa-lkm.git ]; then
   git apply ../patches/ravenna-alsa-lkm-independent-playback-capture.patch
   git apply ../patches/ravenna-alsa-lkm-direct-pcm-transfer.patch
   git apply ../patches/ravenna-alsa-lkm-enable-mono-channels.patch
+  git apply ../patches/ravenna-alsa-lkm-init-play-capture-buffers.patch
   echo "Building ravenna-alsa-lkm kernel module ..."
   cd driver
   make
   cd ../..
 fi
 
+exit 1
+
 if [ ! -d cpp-httplib.git ]; then
   git clone https://github.com/yhirose/cpp-httplib.git
   cd cpp-httplib