diff --git a/common/aidl/aidl_api/android.hardware.common/current/android/hardware/common/SynchronizedReadWrite.aidl b/common/aidl/aidl_api/android.hardware.common/current/android/hardware/common/SynchronizedReadWrite.aidl
deleted file mode 100644
index aec3d6d..0000000
--- a/common/aidl/aidl_api/android.hardware.common/current/android/hardware/common/SynchronizedReadWrite.aidl
+++ /dev/null
@@ -1,22 +0,0 @@
-///////////////////////////////////////////////////////////////////////////////
-// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
-///////////////////////////////////////////////////////////////////////////////
-
-// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
-// edit this file. It looks like you are doing that because you have modified
-// an AIDL interface in a backward-incompatible way, e.g., deleting a function
-// from an interface or a field from a parcelable and it broke the build. That
-// breakage is intended.
-//
-// You must not make a backward incompatible changes to the AIDL files built
-// with the aidl_interface module type with versions property set. The module
-// type is used to build AIDL files in a way that they can be used across
-// independently updatable components of the system. If a device is shipped
-// with such a backward incompatible change, it has a high risk of breaking
-// later when a module using the interface is updated, e.g., Mainline modules.
-
-package android.hardware.common;
-@VintfStability
-enum SynchronizedReadWrite {
-  EMPTY = 0,
-}
diff --git a/common/aidl/aidl_api/android.hardware.common/current/android/hardware/common/UnsynchronizedWrite.aidl b/common/aidl/aidl_api/android.hardware.common/current/android/hardware/common/UnsynchronizedWrite.aidl
deleted file mode 100644
index e390d20..0000000
--- a/common/aidl/aidl_api/android.hardware.common/current/android/hardware/common/UnsynchronizedWrite.aidl
+++ /dev/null
@@ -1,22 +0,0 @@
-///////////////////////////////////////////////////////////////////////////////
-// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
-///////////////////////////////////////////////////////////////////////////////
-
-// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
-// edit this file. It looks like you are doing that because you have modified
-// an AIDL interface in a backward-incompatible way, e.g., deleting a function
-// from an interface or a field from a parcelable and it broke the build. That
-// breakage is intended.
-//
-// You must not make a backward incompatible changes to the AIDL files built
-// with the aidl_interface module type with versions property set. The module
-// type is used to build AIDL files in a way that they can be used across
-// independently updatable components of the system. If a device is shipped
-// with such a backward incompatible change, it has a high risk of breaking
-// later when a module using the interface is updated, e.g., Mainline modules.
-
-package android.hardware.common;
-@VintfStability
-enum UnsynchronizedWrite {
-  EMPTY = 0,
-}
diff --git a/common/aidl/android/hardware/common/MQDescriptor.aidl b/common/aidl/android/hardware/common/MQDescriptor.aidl
index 7e89b15..8997688 100644
--- a/common/aidl/android/hardware/common/MQDescriptor.aidl
+++ b/common/aidl/android/hardware/common/MQDescriptor.aidl
@@ -22,12 +22,9 @@
  * For use with libfmq. This is created from an instance of AidlMessageQueue,
  * and is used to pass information required to create another instance of that
  * queue for fast communication.
- * T - is used to specify the type of the payload
- * Flavor - is used to specify the type of the queue using
- * android.hardware.common.SynchronizedReadWrite or UnsynchronizedWrite
  */
 @VintfStability
-parcelable MQDescriptor<T, Flavor> {
+parcelable MQDescriptor {
     /*
      * Describes each of the grantors for the message queue. They are used to
      * get the readptr, writeptr, dataptr, and the optional EventFlag word
diff --git a/common/aidl/android/hardware/common/SynchronizedReadWrite.aidl b/common/aidl/android/hardware/common/SynchronizedReadWrite.aidl
deleted file mode 100644
index ef93bf2..0000000
--- a/common/aidl/android/hardware/common/SynchronizedReadWrite.aidl
+++ /dev/null
@@ -1,27 +0,0 @@
-/*
- * Copyright 2020 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package android.hardware.common;
-
-/*
- * For use with android.hardware.common.MQDescriptor to specify which type of
- * queue to use. SynchronizedReadWrite is single reader, single writer, with no
- * overflow. All messages written need to be read.
- */
-@VintfStability
-enum SynchronizedReadWrite {
-    EMPTY,
-}
diff --git a/common/aidl/android/hardware/common/UnsynchronizedWrite.aidl b/common/aidl/android/hardware/common/UnsynchronizedWrite.aidl
deleted file mode 100644
index aa27c8d..0000000
--- a/common/aidl/android/hardware/common/UnsynchronizedWrite.aidl
+++ /dev/null
@@ -1,27 +0,0 @@
-/*
- * Copyright 2020 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package android.hardware.common;
-
-/*
- * For use with android.hardware.common.MQDescriptor to specify which type of
- * queue to use. UnsynchronizedWrite is single writer, multiple reader, with
- * overflow. If messages are not read fast enough, they can be overwritten.
- */
-@VintfStability
-enum UnsynchronizedWrite {
-    EMPTY,
-}
diff --git a/tests/msgq/1.0/ITestMsgQ.hal b/tests/msgq/1.0/ITestMsgQ.hal
index bd10237..112270a 100644
--- a/tests/msgq/1.0/ITestMsgQ.hal
+++ b/tests/msgq/1.0/ITestMsgQ.hal
@@ -31,7 +31,7 @@
      *
      * @return ret True if the setup is successful.
      */
-    configureFmqSyncReadWrite(fmq_sync<int32_t> mqDesc) generates(bool ret);
+    configureFmqSyncReadWrite(fmq_sync<uint16_t> mqDesc) generates(bool ret);
 
     /**
      * This method requests the service to return an MQDescriptor to
@@ -46,7 +46,7 @@
      * @return mqDesc This structure describes the unsynchronized FMQ that was
      * set up by the service. Client can use it to set up the FMQ at its end.
      */
-    getFmqUnsyncWrite(bool configureFmq) generates(bool ret, fmq_unsync<int32_t> mqDesc);
+    getFmqUnsyncWrite(bool configureFmq) generates(bool ret, fmq_unsync<uint16_t> mqDesc);
 
     /**
      * This method request the service to write into the synchronized read/write
diff --git a/tests/msgq/1.0/default/TestMsgQ.cpp b/tests/msgq/1.0/default/TestMsgQ.cpp
index 4473737..ba665c9 100644
--- a/tests/msgq/1.0/default/TestMsgQ.cpp
+++ b/tests/msgq/1.0/default/TestMsgQ.cpp
@@ -25,7 +25,7 @@
 
 // Methods from ::android::hardware::tests::msgq::V1_0::ITestMsgQ follow.
 Return<bool> TestMsgQ::configureFmqSyncReadWrite(
-        const android::hardware::MQDescriptorSync<int32_t>& mqDesc) {
+    const android::hardware::MQDescriptorSync<uint16_t>& mqDesc) {
     mFmqSynchronized.reset(new (std::nothrow) MessageQueueSync(mqDesc));
     if ((mFmqSynchronized == nullptr) || (mFmqSynchronized->isValid() == false)) {
         return false;
@@ -56,7 +56,7 @@
 }
 
 Return<bool> TestMsgQ::requestWriteFmqSync(int32_t count) {
-    std::vector<int32_t> data(count);
+    std::vector<uint16_t> data(count);
     for (int i = 0; i < count; i++) {
         data[i] = i;
     }
@@ -65,14 +65,14 @@
 }
 
 Return<bool> TestMsgQ::requestReadFmqSync(int32_t count) {
-    std::vector<int32_t> data(count);
+    std::vector<uint16_t> data(count);
     bool result = mFmqSynchronized->read(&data[0], count)
             && verifyData(&data[0], count);
     return result;
 }
 
 Return<bool> TestMsgQ::requestWriteFmqUnsync(int32_t count) {
-    std::vector<int32_t> data(count);
+    std::vector<uint16_t> data(count);
     for (int i = 0; i < count; i++) {
         data[i] = i;
     }
@@ -81,14 +81,14 @@
 }
 
 Return<bool> TestMsgQ::requestReadFmqUnsync(int32_t count) {
-    std::vector<int32_t> data(count);
+    std::vector<uint16_t> data(count);
     bool result =
             mFmqUnsynchronized->read(&data[0], count) && verifyData(&data[0], count);
     return result;
 }
 
 Return<void> TestMsgQ::requestBlockingRead(int32_t count) {
-    std::vector<int32_t> data(count);
+    std::vector<uint16_t> data(count);
     bool result = mFmqSynchronized->readBlocking(
             &data[0],
             count,
@@ -103,7 +103,7 @@
 }
 
 Return<void> TestMsgQ::requestBlockingReadDefaultEventFlagBits(int32_t count) {
-    std::vector<int32_t> data(count);
+    std::vector<uint16_t> data(count);
     bool result = mFmqSynchronized->readBlocking(
             &data[0],
             count);
@@ -116,7 +116,7 @@
 }
 
 Return<void> TestMsgQ::requestBlockingReadRepeat(int32_t count, int32_t numIter) {
-    std::vector<int32_t> data(count);
+    std::vector<uint16_t> data(count);
     for (int i = 0; i < numIter; i++) {
         bool result = mFmqSynchronized->readBlocking(
                 &data[0],
diff --git a/tests/msgq/1.0/default/TestMsgQ.h b/tests/msgq/1.0/default/TestMsgQ.h
index 8a204b7..f9fcddd 100644
--- a/tests/msgq/1.0/default/TestMsgQ.h
+++ b/tests/msgq/1.0/default/TestMsgQ.h
@@ -49,13 +49,13 @@
 using android::hardware::MessageQueue;
 
 struct TestMsgQ : public ITestMsgQ {
-    typedef MessageQueue<int32_t, kSynchronizedReadWrite> MessageQueueSync;
-    typedef MessageQueue<int32_t, kUnsynchronizedWrite> MessageQueueUnsync;
+    typedef MessageQueue<uint16_t, kSynchronizedReadWrite> MessageQueueSync;
+    typedef MessageQueue<uint16_t, kUnsynchronizedWrite> MessageQueueUnsync;
 
     TestMsgQ() : mFmqSynchronized(nullptr), mFmqUnsynchronized(nullptr) {}
 
     // Methods from ::android::hardware::tests::msgq::V1_0::ITestMsgQ follow.
-    Return<bool> configureFmqSyncReadWrite(const MQDescriptorSync<int32_t>& mqDesc) override;
+    Return<bool> configureFmqSyncReadWrite(const MQDescriptorSync<uint16_t>& mqDesc) override;
     Return<void> getFmqUnsyncWrite(bool configureFmq, getFmqUnsyncWrite_cb _hidl_cb) override;
     Return<bool> requestWriteFmqSync(int32_t count) override;
     Return<bool> requestReadFmqSync(int32_t count) override;
@@ -73,7 +73,7 @@
     /*
      * Utility function to verify data read from the fast message queue.
      */
-    bool verifyData(int32_t* data, int count) {
+    bool verifyData(uint16_t* data, int count) {
         for (int i = 0; i < count; i++) {
             if (data[i] != i) return false;
         }