diff --git a/services/core/java/com/android/server/hdmi/HdmiCecLocalDeviceAudioSystem.java b/services/core/java/com/android/server/hdmi/HdmiCecLocalDeviceAudioSystem.java
index 10f7db5e3a731..a2882de7ee7ac 100644
--- a/services/core/java/com/android/server/hdmi/HdmiCecLocalDeviceAudioSystem.java
+++ b/services/core/java/com/android/server/hdmi/HdmiCecLocalDeviceAudioSystem.java
@@ -961,7 +961,10 @@ public class HdmiCecLocalDeviceAudioSystem extends HdmiCecLocalDeviceSource {
     @ServiceThreadOnly
     void doManualPortSwitching(int portId, IHdmiControlCallback callback) {
         assertRunOnServiceThread();
-        // TODO: validate port ID
+        if (!mService.isValidPortId(portId)) {
+            invokeCallback(callback, HdmiControlManager.RESULT_TARGET_NOT_AVAILABLE);
+            return;
+        }
         if (portId == getLocalActivePort()) {
             invokeCallback(callback, HdmiControlManager.RESULT_SUCCESS);
             return;