2 files changed, 130 insertions, 0 deletions
diff --git a/src/com/android/settings/development/DevelopmentSettingsDashboardFragment.java b/src/com/android/settings/development/DevelopmentSettingsDashboardFragment.java
index 5be381a04c..54ca6ef776 100644
--- a/src/com/android/settings/development/DevelopmentSettingsDashboardFragment.java
+++ b/src/com/android/settings/development/DevelopmentSettingsDashboardFragment.java
@@ -439,6 +439,7 @@ public class DevelopmentSettingsDashboardFragment extends RestrictedDashboardFra
         controllers.add(new TransitionAnimationScalePreferenceController(context));
         controllers.add(new AnimatorDurationScalePreferenceController(context));
         controllers.add(new SecondaryDisplayPreferenceController(context));
+        controllers.add(new HighFrequencyDisplayPreferenceController(context));
         controllers.add(new GpuViewUpdatesPreferenceController(context));
         controllers.add(new HardwareLayersUpdatesPreferenceController(context));
         controllers.add(new DebugGpuOverdrawPreferenceController(context));
diff --git a/src/com/android/settings/development/HighFrequencyDisplayPreferenceController.java b/src/com/android/settings/development/HighFrequencyDisplayPreferenceController.java
new file mode 100644
index 0000000000..cbb8d4ce6d
--- /dev/null
+++ b/src/com/android/settings/development/HighFrequencyDisplayPreferenceController.java
@@ -0,0 +1,129 @@
+/*
+ * Copyright (C) 2018 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 com.android.settings.development;
+
+import android.content.Context;
+import android.os.IBinder;
+import android.os.Parcel;
+import android.os.RemoteException;
+import android.os.ServiceManager;
+import android.text.TextUtils;
+
+import com.android.settings.R;
+import com.android.settings.core.PreferenceControllerMixin;
+import com.android.settingslib.development.DeveloperOptionsPreferenceController;
+
+import androidx.annotation.VisibleForTesting;
+import androidx.preference.ListPreference;
+import androidx.preference.Preference;
+import androidx.preference.SwitchPreference;
+
+public class HighFrequencyDisplayPreferenceController extends DeveloperOptionsPreferenceController
+        implements Preference.OnPreferenceChangeListener, PreferenceControllerMixin {
+
+    private static final String HIGH_FREQUENCY_DISPLAY_KEY = "high_frequency_display_device";
+
+    private static final String SURFACE_FLINGER_SERVICE_KEY = "SurfaceFlinger";
+    private static final String SURFACE_COMPOSER_INTERFACE_KEY = "android.ui.ISurfaceComposer";
+    private static final int SURFACE_FLINGER_HIGH_FREQUENCY_DISPLAY_CODE = 1029;
+
+    private final IBinder mSurfaceFlingerBinder;
+
+    public HighFrequencyDisplayPreferenceController(Context context) {
+        super(context);
+        mSurfaceFlingerBinder = ServiceManager.getService(SURFACE_FLINGER_SERVICE_KEY);
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return HIGH_FREQUENCY_DISPLAY_KEY;
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        Boolean isEnabled = (Boolean) newValue;
+        writeHighFrequencyDisplaySetting(isEnabled);
+        ((SwitchPreference) preference).setChecked(isEnabled);
+        return true;
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        boolean enableHighFrequencyPanel = readHighFrequencyDisplaySetting();
+        ((SwitchPreference) preference).setChecked(enableHighFrequencyPanel);
+    }
+
+    @Override
+    protected void onDeveloperOptionsSwitchDisabled() {
+        super.onDeveloperOptionsSwitchDisabled();
+        writeHighFrequencyDisplaySetting(false);
+        ((SwitchPreference) mPreference).setChecked(false);
+    }
+
+    @VisibleForTesting
+    boolean readHighFrequencyDisplaySetting() {
+        boolean isEnabled = false;
+        try {
+            if (mSurfaceFlingerBinder != null) {
+                final Parcel data = Parcel.obtain();
+                final Parcel result = Parcel.obtain();
+                data.writeInterfaceToken(SURFACE_COMPOSER_INTERFACE_KEY);
+                data.writeInt(0);
+                data.writeInt(0);
+                mSurfaceFlingerBinder.transact(
+                        SURFACE_FLINGER_HIGH_FREQUENCY_DISPLAY_CODE,
+                        data, result, 0);
+
+                if (result.readInt() != 1 || result.readInt() != 1) {
+                    isEnabled = true;
+                }
+            }
+        } catch (RemoteException ex) {
+            // intentional no-op
+        }
+        return isEnabled;
+    }
+
+    @VisibleForTesting
+    void writeHighFrequencyDisplaySetting(boolean isEnabled) {
+        int multiplier;
+        int divisor;
+
+        if (isEnabled) {
+            // 60Hz * 3/2 = 90Hz
+            multiplier = 2;
+            divisor = 3;
+        } else {
+            multiplier = 1;
+            divisor = 1;
+        }
+
+        try {
+            if (mSurfaceFlingerBinder != null) {
+                final Parcel data = Parcel.obtain();
+                data.writeInterfaceToken(SURFACE_COMPOSER_INTERFACE_KEY);
+                data.writeInt(multiplier);
+                data.writeInt(divisor);
+                mSurfaceFlingerBinder.transact(
+                        SURFACE_FLINGER_HIGH_FREQUENCY_DISPLAY_CODE,
+                        data, null, 0);
+            }
+        } catch (RemoteException ex) {
+            // intentional no-op
+        }
+    }
+}