Merge "PowerManager: Adds a call to reduce refresh rate while device is in BatterySaverMode." into lmp-dev

services/core/java/com/android/server/power/PowerManagerService.java

@@ -58,6 +58,8 @@ import android.os.SystemProperties;
 import android.os.SystemService;
 import android.os.UserHandle;
 import android.os.WorkSource;
+import android.os.Parcel;
+import android.os.ServiceManager;
 import android.provider.Settings;
 import android.service.dreams.DreamManagerInternal;
 import android.util.EventLog;
@@ -659,6 +661,7 @@ public final class PowerManagerService extends com.android.server.SystemService
         if (mLowPowerModeEnabled != lowPowerModeEnabled) {
             mLowPowerModeEnabled = lowPowerModeEnabled;
             powerHintInternal(POWER_HINT_LOW_POWER_MODE, lowPowerModeEnabled ? 1 : 0);
+            setSurfaceFlingerLowPowerMode(lowPowerModeEnabled ? 1 : 0);
             mLowPowerModeEnabled = lowPowerModeEnabled;
             BackgroundThread.getHandler().post(new Runnable() {
                 @Override
@@ -2094,6 +2097,21 @@ public final class PowerManagerService extends com.android.server.SystemService
         nativeSendPowerHint(hintId, data);
     }
 
+    private static void setSurfaceFlingerLowPowerMode(int enabled) {
+        try {
+            final IBinder flinger = ServiceManager.getService("SurfaceFlinger");
+            if (flinger != null) {
+                final Parcel data = Parcel.obtain();
+                data.writeInterfaceToken("android.ui.ISurfaceComposer");
+                data.writeInt(enabled);
+                flinger.transact(1016, data, null, 0);
+                data.recycle();
+            }
+        } catch (RemoteException ex) {
+            Slog.e(TAG, "Failed to reduce refresh rate", ex);
+        }
+    }
+
     /**
      * Low-level function turn the device off immediately, without trying
      * to be clean.  Most people should use {@link ShutdownThread} for a clean shutdown.