diff --git a/usb/gadget/aidl/aidl_api/android.hardware.usb.gadget/current/android/hardware/usb/gadget/UsbSpeed.aidl b/usb/gadget/aidl/aidl_api/android.hardware.usb.gadget/current/android/hardware/usb/gadget/UsbSpeed.aidl
index 0f54ee5..7d4fa17 100644
--- a/usb/gadget/aidl/aidl_api/android.hardware.usb.gadget/current/android/hardware/usb/gadget/UsbSpeed.aidl
+++ b/usb/gadget/aidl/aidl_api/android.hardware.usb.gadget/current/android/hardware/usb/gadget/UsbSpeed.aidl
@@ -34,11 +34,15 @@
 package android.hardware.usb.gadget;
 @Backing(type="int") @VintfStability
 enum UsbSpeed {
-  UNKNOWN = 0,
-  LOWSPEED = 1,
-  FULLSPEED = 2,
-  HIGHSPEED = 3,
-  SUPERSPEED = 4,
-  SUPERSPEED_10Gb = 5,
-  SUPERSPEED_20Gb = 6,
+  UNKNOWN = (-1),
+  LOWSPEED = 0,
+  FULLSPEED = 1,
+  HIGHSPEED = 2,
+  SUPERSPEED = 3,
+  SUPERSPEED_10Gb = 4,
+  SUPERSPEED_20Gb = 5,
+  USB4_GEN2_10Gb = 6,
+  USB4_GEN2_20Gb = 7,
+  USB4_GEN3_20Gb = 8,
+  USB4_GEN3_40Gb = 9,
 }
diff --git a/usb/gadget/aidl/android/hardware/usb/gadget/IUsbGadget.aidl b/usb/gadget/aidl/android/hardware/usb/gadget/IUsbGadget.aidl
index 24a27c6..9c3f0d4 100644
--- a/usb/gadget/aidl/android/hardware/usb/gadget/IUsbGadget.aidl
+++ b/usb/gadget/aidl/android/hardware/usb/gadget/IUsbGadget.aidl
@@ -16,7 +16,6 @@
 
 package android.hardware.usb.gadget;
 
-import android.hardware.usb.gadget.GadgetFunction;
 import android.hardware.usb.gadget.IUsbGadgetCallback;
 
 @VintfStability
@@ -35,7 +34,7 @@
      *
      */
     void setCurrentUsbFunctions(in long functions, in IUsbGadgetCallback callback,
-        in long timeoutMs, long transactionId);
+            in long timeoutMs, long transactionId);
 
     /**
      * This function is used to query the USB functions included in the
diff --git a/usb/gadget/aidl/android/hardware/usb/gadget/IUsbGadgetCallback.aidl b/usb/gadget/aidl/android/hardware/usb/gadget/IUsbGadgetCallback.aidl
index 5a682d6..b4945a0 100644
--- a/usb/gadget/aidl/android/hardware/usb/gadget/IUsbGadgetCallback.aidl
+++ b/usb/gadget/aidl/android/hardware/usb/gadget/IUsbGadgetCallback.aidl
@@ -16,7 +16,6 @@
 
 package android.hardware.usb.gadget;
 
-import android.hardware.usb.gadget.GadgetFunction;
 import android.hardware.usb.gadget.Status;
 import android.hardware.usb.gadget.UsbSpeed;
 
diff --git a/usb/gadget/aidl/android/hardware/usb/gadget/UsbSpeed.aidl b/usb/gadget/aidl/android/hardware/usb/gadget/UsbSpeed.aidl
index 0492757..2a3fb93 100644
--- a/usb/gadget/aidl/android/hardware/usb/gadget/UsbSpeed.aidl
+++ b/usb/gadget/aidl/android/hardware/usb/gadget/UsbSpeed.aidl
@@ -22,29 +22,55 @@
     /**
      * UNKNOWN - Not Connected or Unsupported Speed
      */
-    UNKNOWN = 0,
+    UNKNOWN = -1,
+
     /**
      * USB Low Speed
      */
-    LOWSPEED = 1,
+    LOWSPEED = 0,
+
     /**
      * USB Full Speed
      */
-    FULLSPEED = 2,
+    FULLSPEED = 1,
+
     /**
      * USB High Speed
      */
-    HIGHSPEED = 3,
+    HIGHSPEED = 2,
+
     /**
      * USB Super Speed
      */
-    SUPERSPEED = 4,
+    SUPERSPEED = 3,
+
     /**
      * USB Super Speed 10Gbps
      */
-    SUPERSPEED_10Gb = 5,
+    SUPERSPEED_10Gb = 4,
+
     /**
      * USB Super Speed 20Gbps
      */
-    SUPERSPEED_20Gb = 6,
+    SUPERSPEED_20Gb = 5,
+
+    /**
+     * USB4 Gen2 x 1 (10Gbps)
+     */
+    USB4_GEN2_10Gb = 6,
+
+    /**
+     * USB4 Gen2 x 2 (20Gbps)
+     */
+    USB4_GEN2_20Gb = 7,
+
+    /**
+     * USB4 Gen3 x 1 (20Gbps)
+     */
+    USB4_GEN3_20Gb = 8,
+
+    /**
+     * USB4 Gen3 x 2 (40Gbps)
+     */
+    USB4_GEN3_40Gb = 9,
 }