Merge "Make mTvSystemAudioModeSupport originally null and fix related logic"

services/core/java/com/android/server/hdmi/HdmiCecLocalDeviceAudioSystem.java

@@ -74,7 +74,15 @@ public class HdmiCecLocalDeviceAudioSystem extends HdmiCecLocalDeviceSource {
     @GuardedBy("mLock")
     private boolean mSystemAudioControlFeatureEnabled;
 
-    private boolean mTvSystemAudioModeSupport;
+    /**
+     * Indicates if the TV that the current device is connected to supports System Audio Mode or not
+     *
+     * <p>If the current device has no information on this, keep mTvSystemAudioModeSupport null
+     *
+     * <p>The boolean will be reset to null every time when the current device goes to standby
+     * or loses its physical address.
+     */
+    private Boolean mTvSystemAudioModeSupport = null;
 
     // Whether ARC is available or not. "true" means that ARC is established between TV and
     // AVR as audio receiver.
@@ -321,7 +329,7 @@ public class HdmiCecLocalDeviceAudioSystem extends HdmiCecLocalDeviceSource {
     @ServiceThreadOnly
     protected void onStandby(boolean initiatedByCec, int standbyAction) {
         assertRunOnServiceThread();
-        mTvSystemAudioModeSupport = false;
+        mTvSystemAudioModeSupport = null;
         // Record the last state of System Audio Control before going to standby
         synchronized (mLock) {
             mService.writeStringSystemProperty(
@@ -1029,12 +1037,11 @@ public class HdmiCecLocalDeviceAudioSystem extends HdmiCecLocalDeviceSource {
      * <p>The result of the query may be cached until Audio device type is put in standby or loses
      * its physical address.
      */
-    // TODO(amyjojo): making mTvSystemAudioModeSupport null originally and fix the logic.
     void queryTvSystemAudioModeSupport(TvSystemAudioModeSupportedCallback callback) {
-        if (!mTvSystemAudioModeSupport) {
+        if (mTvSystemAudioModeSupport == null) {
             addAndStartAction(new DetectTvSystemAudioModeSupportAction(this, callback));
         } else {
-            callback.onResult(true);
+            callback.onResult(mTvSystemAudioModeSupport);
         }
     }