diff --git a/graphics/common/aidl/android/hardware/graphics/common/DisplayHotplugEvent.aidl b/graphics/common/aidl/android/hardware/graphics/common/DisplayHotplugEvent.aidl
index c807ffd..f779105 100644
--- a/graphics/common/aidl/android/hardware/graphics/common/DisplayHotplugEvent.aidl
+++ b/graphics/common/aidl/android/hardware/graphics/common/DisplayHotplugEvent.aidl
@@ -23,23 +23,23 @@
 @Backing(type="int")
 enum DisplayHotplugEvent {
     /**
-     * Display is successfully connected.
-     * Connected may be called more than once and the behavior of subsequent
-     * calls is that SurfaceFlinger queries the display properties again.
+     * Display was successfully connected.
+     * CONNECTED may be emitted more than once and the behavior of subsequent
+     * events is that SurfaceFlinger queries the display properties again.
      */
     CONNECTED = 0,
 
-    /** Display is successfully disconnected */
+    /** Display was successfully disconnected */
     DISCONNECTED = 1,
 
-    /** Display is plugged in, but an unknown error occurred */
+    /** Unknown error occurred */
     ERROR_UNKNOWN = -1,
 
-    /** Display is plugged in, but incompatible cable error detected */
+    /** Display was plugged in, but incompatible cable error detected */
     ERROR_INCOMPATIBLE_CABLE = -2,
 
     /**
-     * Display is plugged in, but exceeds the max number of
+     * Display was plugged in, but exceeds the max number of
      * displays that can be simultaneously connected
      */
     ERROR_TOO_MANY_DISPLAYS = -3,
diff --git a/graphics/composer/aidl/aidl_api/android.hardware.graphics.composer3/current/android/hardware/graphics/composer3/IComposerClient.aidl b/graphics/composer/aidl/aidl_api/android.hardware.graphics.composer3/current/android/hardware/graphics/composer3/IComposerClient.aidl
index 55604a6..adbc344 100644
--- a/graphics/composer/aidl/aidl_api/android.hardware.graphics.composer3/current/android/hardware/graphics/composer3/IComposerClient.aidl
+++ b/graphics/composer/aidl/aidl_api/android.hardware.graphics.composer3/current/android/hardware/graphics/composer3/IComposerClient.aidl
@@ -88,6 +88,7 @@
   android.hardware.graphics.composer3.DisplayConfiguration[] getDisplayConfigurations(long display, int maxFrameIntervalNs);
   oneway void notifyExpectedPresent(long display, in android.hardware.graphics.composer3.ClockMonotonicTimestamp expectedPresentTime, int frameIntervalNs);
   int getMaxLayerPictureProfiles(long display);
+  oneway void startHdcpNegotiation(long display, in android.hardware.drm.HdcpLevels levels);
   const int EX_BAD_CONFIG = 1;
   const int EX_BAD_DISPLAY = 2;
   const int EX_BAD_LAYER = 3;
diff --git a/graphics/composer/aidl/android/hardware/graphics/composer3/IComposerClient.aidl b/graphics/composer/aidl/android/hardware/graphics/composer3/IComposerClient.aidl
index edbb988..b4d2e7f 100644
--- a/graphics/composer/aidl/android/hardware/graphics/composer3/IComposerClient.aidl
+++ b/graphics/composer/aidl/android/hardware/graphics/composer3/IComposerClient.aidl
@@ -16,6 +16,7 @@
 
 package android.hardware.graphics.composer3;
 
+import android.hardware.drm.HdcpLevels;
 import android.hardware.graphics.common.DisplayDecorationSupport;
 import android.hardware.graphics.common.Hdr;
 import android.hardware.graphics.common.HdrConversionCapability;
@@ -938,4 +939,21 @@
      * pipeline, a value of zero should be returned here.
      */
     int getMaxLayerPictureProfiles(long display);
+
+    /**
+     * Supports HDCP lazy activation.
+     *
+     * When SurfaceFlinger detects secure layers, this method is called to instruct HWC side that
+     * HDCP negotiation process can be started.
+     *
+     * When HDCP is successfully started or failed to start, HWC reports the HDCP levels via
+     * IComposerCallback.onHdcpLevelsChanged().
+     *
+     * @param display is the display whose HDCP negotiation can be started.
+     * @param levels is the desired HDCP levels.
+     *
+     * @see IComposerCallback.onHdcpLevelsChanged
+     *
+     */
+    oneway void startHdcpNegotiation(long display, in HdcpLevels levels);
 }
diff --git a/graphics/composer/aidl/vts/Android.bp b/graphics/composer/aidl/vts/Android.bp
index 894ca52..61c2593 100644
--- a/graphics/composer/aidl/vts/Android.bp
+++ b/graphics/composer/aidl/vts/Android.bp
@@ -71,6 +71,7 @@
         "libarect",
         "libbase",
         "libfmq",
+        "libgmock",
         "libgtest",
         "libmath",
         "librenderengine",
diff --git a/graphics/composer/aidl/vts/VtsHalGraphicsComposer3_TargetTest.cpp b/graphics/composer/aidl/vts/VtsHalGraphicsComposer3_TargetTest.cpp
index 4c8a68e..354e3e0 100644
--- a/graphics/composer/aidl/vts/VtsHalGraphicsComposer3_TargetTest.cpp
+++ b/graphics/composer/aidl/vts/VtsHalGraphicsComposer3_TargetTest.cpp
@@ -29,6 +29,7 @@
 #include <android/hardware/graphics/composer3/ComposerClientWriter.h>
 #include <binder/ProcessState.h>
 #include <cutils/ashmem.h>
+#include <gmock/gmock.h>
 #include <gtest/gtest.h>
 #include <ui/Fence.h>
 #include <ui/GraphicBuffer.h>
@@ -47,6 +48,8 @@
 #undef LOG_TAG
 #define LOG_TAG "VtsHalGraphicsComposer3_TargetTest"
 
+using testing::Ge;
+
 namespace aidl::android::hardware::graphics::composer3::vts {
 
 using namespace std::chrono_literals;
@@ -1409,14 +1412,6 @@
     }
 }
 
-TEST_P(GraphicsComposerAidlV3Test, GetMaxLayerPictureProfiles) {
-    for (const auto& display : mDisplays) {
-        const auto& [status, maxPorfiles] =
-                mComposerClient->getMaxLayerPictureProfiles(display.getDisplayId());
-        EXPECT_TRUE(status.isOk());
-    }
-}
-
 // Tests for Command.
 class GraphicsComposerAidlCommandTest : public GraphicsComposerAidlTest {
   protected:
@@ -3249,19 +3244,44 @@
     });
 }
 
-TEST_P(GraphicsComposerAidlCommandV3Test, getMaxLayerPictureProfiles_success) {
+class GraphicsComposerAidlCommandV4Test : public GraphicsComposerAidlCommandTest {
+  protected:
+    void SetUp() override {
+        GraphicsComposerAidlTest::SetUp();
+        if (getInterfaceVersion() <= 3) {
+            GTEST_SKIP() << "Device interface version is expected to be >= 4";
+        }
+    }
+};
+
+TEST_P(GraphicsComposerAidlCommandV4Test, getMaxLayerPictureProfiles_success) {
     for (auto& display : mDisplays) {
         int64_t displayId = display.getDisplayId();
         if (!hasDisplayCapability(displayId, DisplayCapability::PICTURE_PROCESSING)) {
             continue;
         }
         const auto& [status, maxProfiles] =
-                mComposerClient->getMaxLayerPictureProfiles(getPrimaryDisplayId());
+                mComposerClient->getMaxLayerPictureProfiles(displayId);
         EXPECT_TRUE(status.isOk());
+        EXPECT_THAT(maxProfiles, Ge(0));
     }
 }
 
-TEST_P(GraphicsComposerAidlCommandV3Test, setDisplayPictureProfileId_success) {
+TEST_P(GraphicsComposerAidlCommandV4Test, getMaxLayerPictureProfiles_unsupported) {
+    for (auto& display : mDisplays) {
+        int64_t displayId = display.getDisplayId();
+        if (hasDisplayCapability(displayId, DisplayCapability::PICTURE_PROCESSING)) {
+            continue;
+        }
+        const auto& [status, maxProfiles] =
+                mComposerClient->getMaxLayerPictureProfiles(displayId);
+        EXPECT_FALSE(status.isOk());
+        EXPECT_NO_FATAL_FAILURE(
+                assertServiceSpecificError(status, IComposerClient::EX_UNSUPPORTED));
+    }
+}
+
+TEST_P(GraphicsComposerAidlCommandV4Test, setDisplayPictureProfileId_success) {
     for (auto& display : mDisplays) {
         int64_t displayId = display.getDisplayId();
         if (!hasDisplayCapability(displayId, DisplayCapability::PICTURE_PROCESSING)) {
@@ -3272,7 +3292,7 @@
         const auto layer = createOnScreenLayer(display);
         const auto buffer = allocate(::android::PIXEL_FORMAT_RGBA_8888);
         ASSERT_NE(nullptr, buffer->handle);
-        // TODO(b/337330263): Lookup profile IDs from PictureProfileService
+        // TODO(b/337330263): Lookup profile IDs from MediaQualityManager
         writer.setDisplayPictureProfileId(displayId, PictureProfileId(1));
         writer.setLayerBuffer(displayId, layer, /*slot*/ 0, buffer->handle,
                               /*acquireFence*/ -1);
@@ -3281,7 +3301,7 @@
     }
 }
 
-TEST_P(GraphicsComposerAidlCommandV3Test, setLayerPictureProfileId_success) {
+TEST_P(GraphicsComposerAidlCommandV4Test, setLayerPictureProfileId_success) {
     for (auto& display : mDisplays) {
         int64_t displayId = display.getDisplayId();
         if (!hasDisplayCapability(displayId, DisplayCapability::PICTURE_PROCESSING)) {
@@ -3299,14 +3319,14 @@
         ASSERT_NE(nullptr, buffer->handle);
         writer.setLayerBuffer(displayId, layer, /*slot*/ 0, buffer->handle,
                               /*acquireFence*/ -1);
-        // TODO(b/337330263): Lookup profile IDs from PictureProfileService
+        // TODO(b/337330263): Lookup profile IDs from MediaQualityManager
         writer.setLayerPictureProfileId(displayId, layer, PictureProfileId(1));
         execute();
         ASSERT_TRUE(mReader.takeErrors().empty());
     }
 }
 
-TEST_P(GraphicsComposerAidlCommandV3Test, setLayerPictureProfileId_failsWithTooManyProfiles) {
+TEST_P(GraphicsComposerAidlCommandV4Test, setLayerPictureProfileId_failsWithTooManyProfiles) {
     for (auto& display : mDisplays) {
         int64_t displayId = display.getDisplayId();
         if (!hasDisplayCapability(displayId, DisplayCapability::PICTURE_PROCESSING)) {
@@ -3325,7 +3345,7 @@
             ASSERT_NE(nullptr, buffer->handle);
             writer.setLayerBuffer(displayId, layer, /*slot*/ 0, buffer->handle,
                                   /*acquireFence*/ -1);
-            // TODO(b/337330263): Lookup profile IDs from PictureProfileService
+            // TODO(b/337330263): Lookup profile IDs from MediaQualityManager
             writer.setLayerPictureProfileId(displayId, layer, PictureProfileId(profileId));
         }
         execute();
@@ -3335,16 +3355,6 @@
     }
 }
 
-class GraphicsComposerAidlCommandV4Test : public GraphicsComposerAidlCommandTest {
-  protected:
-    void SetUp() override {
-        GraphicsComposerAidlTest::SetUp();
-        if (getInterfaceVersion() <= 3) {
-            GTEST_SKIP() << "Device interface version is expected to be >= 4";
-        }
-    }
-};
-
 TEST_P(GraphicsComposerAidlCommandV4Test, SetUnsupportedLayerLuts) {
     auto& writer = getWriter(getPrimaryDisplayId());
     const auto& [layerStatus, layer] =
diff --git a/power/aidl/aidl_api/android.hardware.power/current/android/hardware/power/CpuHeadroomParams.aidl b/power/aidl/aidl_api/android.hardware.power/current/android/hardware/power/CpuHeadroomParams.aidl
index 09a2ace..de92105 100644
--- a/power/aidl/aidl_api/android.hardware.power/current/android/hardware/power/CpuHeadroomParams.aidl
+++ b/power/aidl/aidl_api/android.hardware.power/current/android/hardware/power/CpuHeadroomParams.aidl
@@ -34,9 +34,10 @@
 package android.hardware.power;
 @JavaDerive(equals=true, toString=true) @VintfStability
 parcelable CpuHeadroomParams {
-  android.hardware.power.CpuHeadroomParams.CalculationType calculationType;
-  android.hardware.power.CpuHeadroomParams.SelectionType selectionType;
-  int pid;
+  android.hardware.power.CpuHeadroomParams.CalculationType calculationType = android.hardware.power.CpuHeadroomParams.CalculationType.MIN;
+  int calculationWindowMillis = 1000;
+  android.hardware.power.CpuHeadroomParams.SelectionType selectionType = android.hardware.power.CpuHeadroomParams.SelectionType.ALL;
+  int[] tids;
   enum CalculationType {
     MIN,
     AVERAGE,
diff --git a/power/aidl/aidl_api/android.hardware.power/current/android/hardware/power/CpuHeadroomResult.aidl b/power/aidl/aidl_api/android.hardware.power/current/android/hardware/power/CpuHeadroomResult.aidl
new file mode 100644
index 0000000..9303906
--- /dev/null
+++ b/power/aidl/aidl_api/android.hardware.power/current/android/hardware/power/CpuHeadroomResult.aidl
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2024 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.
+ */
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
+//
+// You must not make a backward incompatible change to any AIDL file 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.power;
+@JavaDerive(equals=true, toString=true) @VintfStability
+union CpuHeadroomResult {
+  float globalHeadroom;
+  float[] perCoreHeadroom;
+}
diff --git a/power/aidl/aidl_api/android.hardware.power/current/android/hardware/power/GpuHeadroomParams.aidl b/power/aidl/aidl_api/android.hardware.power/current/android/hardware/power/GpuHeadroomParams.aidl
index 64bb4a4..6faa938 100644
--- a/power/aidl/aidl_api/android.hardware.power/current/android/hardware/power/GpuHeadroomParams.aidl
+++ b/power/aidl/aidl_api/android.hardware.power/current/android/hardware/power/GpuHeadroomParams.aidl
@@ -34,7 +34,8 @@
 package android.hardware.power;
 @JavaDerive(equals=true, toString=true) @VintfStability
 parcelable GpuHeadroomParams {
-  android.hardware.power.GpuHeadroomParams.CalculationType calculationType;
+  android.hardware.power.GpuHeadroomParams.CalculationType calculationType = android.hardware.power.GpuHeadroomParams.CalculationType.MIN;
+  int calculationWindowMillis = 1000;
   enum CalculationType {
     MIN,
     AVERAGE,
diff --git a/power/aidl/aidl_api/android.hardware.power/current/android/hardware/power/GpuHeadroomResult.aidl b/power/aidl/aidl_api/android.hardware.power/current/android/hardware/power/GpuHeadroomResult.aidl
new file mode 100644
index 0000000..bbd3d8b
--- /dev/null
+++ b/power/aidl/aidl_api/android.hardware.power/current/android/hardware/power/GpuHeadroomResult.aidl
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2024 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.
+ */
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
+//
+// You must not make a backward incompatible change to any AIDL file 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.power;
+@JavaDerive(equals=true, toString=true) @VintfStability
+union GpuHeadroomResult {
+  float globalHeadroom;
+}
diff --git a/power/aidl/aidl_api/android.hardware.power/current/android/hardware/power/IPower.aidl b/power/aidl/aidl_api/android.hardware.power/current/android/hardware/power/IPower.aidl
index a855ddd..9d20ca1 100644
--- a/power/aidl/aidl_api/android.hardware.power/current/android/hardware/power/IPower.aidl
+++ b/power/aidl/aidl_api/android.hardware.power/current/android/hardware/power/IPower.aidl
@@ -44,8 +44,8 @@
   android.hardware.power.ChannelConfig getSessionChannel(in int tgid, in int uid);
   oneway void closeSessionChannel(in int tgid, in int uid);
   android.hardware.power.SupportInfo getSupportInfo();
-  float[] getCpuHeadroom(in android.hardware.power.CpuHeadroomParams params);
-  float getGpuHeadroom(in android.hardware.power.GpuHeadroomParams params);
+  android.hardware.power.CpuHeadroomResult getCpuHeadroom(in android.hardware.power.CpuHeadroomParams params);
+  android.hardware.power.GpuHeadroomResult getGpuHeadroom(in android.hardware.power.GpuHeadroomParams params);
   long getCpuHeadroomMinIntervalMillis();
   long getGpuHeadroomMinIntervalMillis();
   oneway void sendCompositionData(in android.hardware.power.CompositionData[] data);
diff --git a/power/aidl/android/hardware/power/CpuHeadroomParams.aidl b/power/aidl/android/hardware/power/CpuHeadroomParams.aidl
index cf71b67..64c7b44 100644
--- a/power/aidl/android/hardware/power/CpuHeadroomParams.aidl
+++ b/power/aidl/android/hardware/power/CpuHeadroomParams.aidl
@@ -32,7 +32,14 @@
     /**
      * The calculation type.
      */
-    CalculationType calculationType;
+    CalculationType calculationType = CalculationType.MIN;
+
+    /**
+     * The calculation rolling window size in milliseconds.
+     * The device should support a superset of [50, 10000] and try to use the closest feasible
+     * window size to the provided value param.
+     */
+    int calculationWindowMillis = 1000;
 
     /**
      * Defines how to select the CPU.
@@ -47,16 +54,17 @@
     /**
      * The CPU selection type.
      */
-    SelectionType selectionType;
+    SelectionType selectionType = SelectionType.ALL;
 
     /**
-     * The caller thread's PID.
+     * The thread TIDs to track.
      *
-     * If pid is positive, return the headroom only for cores that are available
-     * to the given pid, otherwise return the headroom(s) for all cores.
+     * If tids are not-empty, return the headrooms only for cores that are available
+     * to the given tids, otherwise return the headroom(s) for all cores.
      *
-     * This should handle all the cases including but not limited to thread core
-     * affinity and app cpuset that change the available CPU cores for the caller.
+     * This should handle all the cases including but not limited to core affinity and app cpuset
+     * that change the available CPU cores for the caller. And the HAL should check that the TIDs
+     * have the same core affinity.
      */
-    int pid;
+    int[] tids;
 }
diff --git a/power/aidl/android/hardware/power/CpuHeadroomResult.aidl b/power/aidl/android/hardware/power/CpuHeadroomResult.aidl
new file mode 100644
index 0000000..316d5f6
--- /dev/null
+++ b/power/aidl/android/hardware/power/CpuHeadroomResult.aidl
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2024 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.power;
+
+/**
+ * Headroom value result depending on the request params.
+ *
+ * Each value is ranged from [0, 100], where 0 indicates no CPU resources were left
+ * during the calculation interval and the app may expect low resources to be granted.
+ */
+@VintfStability
+@JavaDerive(equals=true, toString=true)
+union CpuHeadroomResult {
+    /**
+     * If ALL selection type is requested.
+     */
+    float globalHeadroom;
+    /**
+     * If PER_CORE selection type is requested.
+     */
+    float[] perCoreHeadroom;
+}
diff --git a/power/aidl/android/hardware/power/GpuHeadroomParams.aidl b/power/aidl/android/hardware/power/GpuHeadroomParams.aidl
index 972adbc..68848d8 100644
--- a/power/aidl/android/hardware/power/GpuHeadroomParams.aidl
+++ b/power/aidl/android/hardware/power/GpuHeadroomParams.aidl
@@ -32,5 +32,11 @@
     /**
      * The calculation type.
      */
-    CalculationType calculationType;
+    CalculationType calculationType = CalculationType.MIN;
+
+    /**
+     * The device should support a superset of [50, 10000] and try to use the closest feasible
+     * window size to the provided value param.
+     */
+    int calculationWindowMillis = 1000;
 }
diff --git a/power/aidl/android/hardware/power/GpuHeadroomResult.aidl b/power/aidl/android/hardware/power/GpuHeadroomResult.aidl
new file mode 100644
index 0000000..ef3257d
--- /dev/null
+++ b/power/aidl/android/hardware/power/GpuHeadroomResult.aidl
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2024 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.power;
+
+/**
+ * Headroom value result depending on the request params.
+ *
+ * Each value is ranged from [0, 100], where 0 indicates no GPU resources were left
+ * during the calculation interval and the app may expect low resources to be granted.
+ */
+@VintfStability
+@JavaDerive(equals=true, toString=true)
+union GpuHeadroomResult {
+    float globalHeadroom;
+}
diff --git a/power/aidl/android/hardware/power/IPower.aidl b/power/aidl/android/hardware/power/IPower.aidl
index db1d93f..41a9379 100644
--- a/power/aidl/android/hardware/power/IPower.aidl
+++ b/power/aidl/android/hardware/power/IPower.aidl
@@ -21,7 +21,9 @@
 import android.hardware.power.CompositionData;
 import android.hardware.power.CompositionUpdate;
 import android.hardware.power.CpuHeadroomParams;
+import android.hardware.power.CpuHeadroomResult;
 import android.hardware.power.GpuHeadroomParams;
+import android.hardware.power.GpuHeadroomResult;
 import android.hardware.power.IPowerHintSession;
 import android.hardware.power.Mode;
 import android.hardware.power.SessionConfig;
@@ -162,24 +164,21 @@
      * Provides an estimate of available CPU headroom the device based on past history.
      * <p>
      * @param params params to customize the CPU headroom calculation
-     * @return a single value or an array of values depending on selection type of params.
-     *         Each value is ranged from [0, 100], and 0 indicates no CPU resources were left
-     *         during the calculation interval and the app may expect low resources to be granted.
      * @throws EX_UNSUPPORTED_OPERATION if the API is unsupported or the request params can't be
      *         served.
+     * @throws EX_SECURITY if the TIDs passed in do not belong to the same process.
+     * @throws EX_ILLEGAL_STATE if the TIDs passed in do not have the same core affinity setting.
      */
-    float[] getCpuHeadroom(in CpuHeadroomParams params);
+    CpuHeadroomResult getCpuHeadroom(in CpuHeadroomParams params);
 
     /**
      * Provides an estimate of available GPU headroom the device based on past history.
      * <p>
      * @param params params to customize the GPU headroom calculation
-     * @return Value is ranged from [0, 100], and 0 indicates no GPU resources were left
-     *         during the calculation interval and the app may expect low resources to be granted.
      * @throws EX_UNSUPPORTED_OPERATION if the API is unsupported or the request params can't be
      *         served.
      */
-    float getGpuHeadroom(in GpuHeadroomParams params);
+    GpuHeadroomResult getGpuHeadroom(in GpuHeadroomParams params);
 
     /**
      * Minimum polling interval for calling getCpuHeadroom in milliseconds.
diff --git a/power/aidl/default/Power.cpp b/power/aidl/default/Power.cpp
index d9353fe..8490b62 100644
--- a/power/aidl/default/Power.cpp
+++ b/power/aidl/default/Power.cpp
@@ -71,14 +71,22 @@
     return ScopedAStatus::ok();
 }
 
-ndk::ScopedAStatus Power::getCpuHeadroom(const CpuHeadroomParams& _,
-                                         std::vector<float>* _aidl_return) {
-    *_aidl_return = {0.5f};
-    return ndk::ScopedAStatus::ok();
+ndk::ScopedAStatus Power::getCpuHeadroom(const CpuHeadroomParams& params,
+                                         CpuHeadroomResult* _aidl_return) {
+    if (params.selectionType == CpuHeadroomParams::SelectionType::ALL) {
+        _aidl_return->set<CpuHeadroomResult::globalHeadroom>(100.0f);
+        return ndk::ScopedAStatus::ok();
+    } else if (params.selectionType == CpuHeadroomParams::SelectionType::PER_CORE) {
+        std::vector<float> headroom = {50.0f, 100.0f};
+        _aidl_return->set<CpuHeadroomResult::perCoreHeadroom>(headroom);
+        return ndk::ScopedAStatus::ok();
+    }
+    return ndk::ScopedAStatus::fromExceptionCode(EX_UNSUPPORTED_OPERATION);
 }
 
-ndk::ScopedAStatus Power::getGpuHeadroom(const GpuHeadroomParams& _, float* _aidl_return) {
-    *_aidl_return = 0.5f;
+ndk::ScopedAStatus Power::getGpuHeadroom(const GpuHeadroomParams& _,
+                                         GpuHeadroomResult* _aidl_return) {
+    _aidl_return->set<GpuHeadroomResult::globalHeadroom>(100.0f);
     return ndk::ScopedAStatus::ok();
 }
 
diff --git a/power/aidl/default/Power.h b/power/aidl/default/Power.h
index 51528c6..c4aa7ab 100644
--- a/power/aidl/default/Power.h
+++ b/power/aidl/default/Power.h
@@ -46,9 +46,10 @@
     ndk::ScopedAStatus closeSessionChannel(int32_t tgid, int32_t uid) override;
     ndk::ScopedAStatus getSupportInfo(SupportInfo* _aidl_return) override;
     ndk::ScopedAStatus getCpuHeadroom(const CpuHeadroomParams& params,
-                                      std::vector<float>* _aidl_return) override;
+                                      CpuHeadroomResult* _aidl_return) override;
+
     ndk::ScopedAStatus getGpuHeadroom(const GpuHeadroomParams& params,
-                                      float* _aidl_return) override;
+                                      GpuHeadroomResult* _aidl_return) override;
     ndk::ScopedAStatus getCpuHeadroomMinIntervalMillis(int64_t* _aidl_return) override;
     ndk::ScopedAStatus getGpuHeadroomMinIntervalMillis(int64_t* _aidl_return) override;
     ndk::ScopedAStatus sendCompositionData(const std::vector<CompositionData>& in_data) override;
diff --git a/power/aidl/vts/VtsHalPowerTargetTest.cpp b/power/aidl/vts/VtsHalPowerTargetTest.cpp
index 0df360a..ffe20c6 100644
--- a/power/aidl/vts/VtsHalPowerTargetTest.cpp
+++ b/power/aidl/vts/VtsHalPowerTargetTest.cpp
@@ -45,7 +45,9 @@
 using android::hardware::power::ChannelConfig;
 using android::hardware::power::ChannelMessage;
 using android::hardware::power::CpuHeadroomParams;
+using android::hardware::power::CpuHeadroomResult;
 using android::hardware::power::GpuHeadroomParams;
+using android::hardware::power::GpuHeadroomResult;
 using android::hardware::power::IPower;
 using android::hardware::power::IPowerHintSession;
 using android::hardware::power::Mode;
@@ -307,7 +309,7 @@
         GTEST_SKIP() << "DEVICE not launching with Power V6 and beyond.";
     }
     CpuHeadroomParams params;
-    std::vector<float> headroom;
+    CpuHeadroomResult headroom;
     auto ret = power->getCpuHeadroom(params, &headroom);
     if (ret.getExceptionCode() == EX_UNSUPPORTED_OPERATION) {
         GTEST_SKIP() << "power->getCpuHeadroom is not supported";
@@ -316,9 +318,9 @@
     int64_t minIntervalMillis;
     ASSERT_TRUE(power->getCpuHeadroomMinIntervalMillis(&minIntervalMillis).isOk());
     ASSERT_GE(minIntervalMillis, 0);
-    ASSERT_GE(headroom.size(), 1);
-    ASSERT_GE(headroom[0], 0.0f);
-    ASSERT_LE(headroom[0], 100.00f);
+    ASSERT_EQ(headroom.getTag(), CpuHeadroomResult::globalHeadroom);
+    ASSERT_GE(headroom.get<CpuHeadroomResult::globalHeadroom>(), 0.0f);
+    ASSERT_LE(headroom.get<CpuHeadroomResult::globalHeadroom>(), 100.00f);
 }
 
 TEST_P(PowerAidl, getGpuHeadroom) {
@@ -326,7 +328,7 @@
         GTEST_SKIP() << "DEVICE not launching with Power V6 and beyond.";
     }
     GpuHeadroomParams params;
-    float headroom;
+    GpuHeadroomResult headroom;
     auto ret = power->getGpuHeadroom(params, &headroom);
     if (ret.getExceptionCode() == EX_UNSUPPORTED_OPERATION) {
         GTEST_SKIP() << "power->getGpuHeadroom is not supported";
@@ -335,8 +337,9 @@
     int64_t minIntervalMillis;
     ASSERT_TRUE(power->getGpuHeadroomMinIntervalMillis(&minIntervalMillis).isOk());
     ASSERT_GE(minIntervalMillis, 0);
-    ASSERT_GE(headroom, 0.0f);
-    ASSERT_LE(headroom, 100.00f);
+    ASSERT_EQ(headroom.getTag(), GpuHeadroomResult::globalHeadroom);
+    ASSERT_GE(headroom.get<GpuHeadroomResult::globalHeadroom>(), 0.0f);
+    ASSERT_LE(headroom.get<GpuHeadroomResult::globalHeadroom>(), 100.00f);
 }
 
 // FIXED_PERFORMANCE mode is required for all devices which ship on Android 11
diff --git a/thermal/aidl/aidl_api/android.hardware.thermal/current/android/hardware/thermal/IThermal.aidl b/thermal/aidl/aidl_api/android.hardware.thermal/current/android/hardware/thermal/IThermal.aidl
index 904496c..3cff780 100644
--- a/thermal/aidl/aidl_api/android.hardware.thermal/current/android/hardware/thermal/IThermal.aidl
+++ b/thermal/aidl/aidl_api/android.hardware.thermal/current/android/hardware/thermal/IThermal.aidl
@@ -46,4 +46,5 @@
   void unregisterThermalChangedCallback(in android.hardware.thermal.IThermalChangedCallback callback);
   void registerCoolingDeviceChangedCallbackWithType(in android.hardware.thermal.ICoolingDeviceChangedCallback callback, in android.hardware.thermal.CoolingType type);
   void unregisterCoolingDeviceChangedCallback(in android.hardware.thermal.ICoolingDeviceChangedCallback callback);
+  float forecastSkinTemperature(in int forecastSeconds);
 }
diff --git a/thermal/aidl/android/hardware/thermal/IThermal.aidl b/thermal/aidl/android/hardware/thermal/IThermal.aidl
index 4aa4090..87f7637 100644
--- a/thermal/aidl/android/hardware/thermal/IThermal.aidl
+++ b/thermal/aidl/android/hardware/thermal/IThermal.aidl
@@ -225,4 +225,20 @@
      *         getMessage() must be populated with human-readable error message.
      */
     void unregisterCoolingDeviceChangedCallback(in ICoolingDeviceChangedCallback callback);
+
+    /**
+     * Retrieves the forecasted skin temperature in Celsius.
+     *
+     * @param forecastSeconds the number of seconds to forecast the skin temperature, it should
+     *                        at least support superset of [0, 60] seconds range.
+     *
+     * @return forecasted skin temperature in Celsius.
+     *
+     * @throws EX_ILLEGAL_STATE If the Thermal HAL is not initialized successfully
+     * @throws EX_ILLEGAL_ARGUMENT If the provided forecastSeconds is negative
+     * @throws EX_UNSUPPORTED_OPERATION if API is not supported or the forecastSeconds exceeds the
+     *         supported range. And the getMessage() must be populated with human-readable
+     *         error message.
+     */
+    float forecastSkinTemperature(in int forecastSeconds);
 }
diff --git a/thermal/aidl/default/Thermal.cpp b/thermal/aidl/default/Thermal.cpp
index 41d0be8..339e9b8 100644
--- a/thermal/aidl/default/Thermal.cpp
+++ b/thermal/aidl/default/Thermal.cpp
@@ -191,4 +191,9 @@
     }
     return ScopedAStatus::ok();
 }
+
+ndk::ScopedAStatus Thermal::forecastSkinTemperature(int32_t, float*) {
+    return ndk::ScopedAStatus::fromExceptionCode(EX_UNSUPPORTED_OPERATION);
+}
+
 }  // namespace aidl::android::hardware::thermal::impl::example
diff --git a/thermal/aidl/default/Thermal.h b/thermal/aidl/default/Thermal.h
index d3d8874..a4d8b00 100644
--- a/thermal/aidl/default/Thermal.h
+++ b/thermal/aidl/default/Thermal.h
@@ -60,6 +60,8 @@
 
     ndk::ScopedAStatus unregisterCoolingDeviceChangedCallback(
             const std::shared_ptr<ICoolingDeviceChangedCallback>& in_callback) override;
+    ndk::ScopedAStatus forecastSkinTemperature(int32_t forecastSeconds,
+                                               float* _aidl_return) override;
 
   private:
     std::mutex thermal_callback_mutex_;
diff --git a/thermal/aidl/vts/VtsHalThermalTargetTest.cpp b/thermal/aidl/vts/VtsHalThermalTargetTest.cpp
index 066e773..17653b4 100644
--- a/thermal/aidl/vts/VtsHalThermalTargetTest.cpp
+++ b/thermal/aidl/vts/VtsHalThermalTargetTest.cpp
@@ -426,6 +426,23 @@
     }
 }
 
+// Test Thermal->forecastSkinTemperature.
+TEST_P(ThermalAidlTest, ForecastSkinTemperatureTest) {
+    auto apiLevel = ::android::base::GetIntProperty<int32_t>("ro.vendor.api_level", 0);
+    if (apiLevel < 202504) {
+        GTEST_SKIP() << "Skipping test as the vendor level is below 202504: " << apiLevel;
+    }
+    float temperature = 0.0f;
+    ::ndk::ScopedAStatus status = mThermal->forecastSkinTemperature(1, &temperature);
+    if (status.getExceptionCode() == EX_UNSUPPORTED_OPERATION) {
+        GTEST_SKIP() << "Skipping test as temperature forecast is not supported";
+    }
+    for (int i = 0; i <= 60; i++) {
+        status = mThermal->forecastSkinTemperature(i, &temperature);
+        ASSERT_NE(NAN, temperature);
+    }
+}
+
 GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(ThermalAidlTest);
 INSTANTIATE_TEST_SUITE_P(
         Thermal, ThermalAidlTest,