diff --git a/services/core/java/com/android/server/display/DisplayDeviceConfig.java b/services/core/java/com/android/server/display/DisplayDeviceConfig.java
index 6866137e294ee..064e307274b94 100644
--- a/services/core/java/com/android/server/display/DisplayDeviceConfig.java
+++ b/services/core/java/com/android/server/display/DisplayDeviceConfig.java
@@ -42,7 +42,6 @@ import com.android.server.display.config.DisplayConfiguration;
 import com.android.server.display.config.DisplayQuirks;
 import com.android.server.display.config.HbmTiming;
 import com.android.server.display.config.HighBrightnessMode;
-import com.android.server.display.config.Interpolation;
 import com.android.server.display.config.NitsMap;
 import com.android.server.display.config.Point;
 import com.android.server.display.config.RefreshRateRange;
@@ -1254,19 +1253,17 @@ public class DisplayDeviceConfig {
         }
     }
 
-    private int convertInterpolationType(Interpolation value) {
-        if (value == null) {
+    private int convertInterpolationType(String value) {
+        if (TextUtils.isEmpty(value)) {
             return INTERPOLATION_DEFAULT;
         }
-        switch (value) {
-            case _default:
-                return INTERPOLATION_DEFAULT;
-            case linear:
-                return INTERPOLATION_LINEAR;
-            default:
-                Slog.wtf(TAG, "Unexpected Interpolation Type: " + value);
-                return INTERPOLATION_DEFAULT;
+
+        if ("linear".equals(value)) {
+            return INTERPOLATION_LINEAR;
         }
+
+        Slog.wtf(TAG, "Unexpected Interpolation Type: " + value);
+        return INTERPOLATION_DEFAULT;
     }
 
     private void loadAmbientHorizonFromDdc(DisplayConfiguration config) {
diff --git a/services/core/xsd/display-device-config/display-device-config.xsd b/services/core/xsd/display-device-config/display-device-config.xsd
index be0ddc155ae03..5b4febda62efa 100644
--- a/services/core/xsd/display-device-config/display-device-config.xsd
+++ b/services/core/xsd/display-device-config/display-device-config.xsd
@@ -170,14 +170,6 @@
         </xs:restriction>
     </xs:simpleType>
 
-    <!-- Maps to DisplayDeviceConfig.INTERPOLATION_* values. -->
-    <xs:simpleType name="interpolation">
-        <xs:restriction base="xs:string">
-            <xs:enumeration value="default"/>
-            <xs:enumeration value="linear"/>
-        </xs:restriction>
-    </xs:simpleType>
-
     <xs:complexType name="thermalThrottling">
         <xs:complexType>
             <xs:element type="brightnessThrottlingMap" name="brightnessThrottlingMap">
@@ -216,7 +208,8 @@
                 <xs:annotation name="final"/>
             </xs:element>
         </xs:sequence>
-        <xs:attribute name="interpolation" type="interpolation" use="optional"/>
+        <!-- valid value of interpolation if specified: linear -->
+        <xs:attribute name="interpolation" type="xs:string" use="optional"/>
     </xs:complexType>
 
     <xs:complexType name="point">
diff --git a/services/core/xsd/display-device-config/schema/current.txt b/services/core/xsd/display-device-config/schema/current.txt
index 2890d686186ed..ba83c9fbcf914 100644
--- a/services/core/xsd/display-device-config/schema/current.txt
+++ b/services/core/xsd/display-device-config/schema/current.txt
@@ -108,17 +108,11 @@ package com.android.server.display.config {
     method public final void setTransitionPoint_all(@NonNull java.math.BigDecimal);
   }
 
-  public enum Interpolation {
-    method public String getRawName();
-    enum_constant public static final com.android.server.display.config.Interpolation _default;
-    enum_constant public static final com.android.server.display.config.Interpolation linear;
-  }
-
   public class NitsMap {
     ctor public NitsMap();
-    method public com.android.server.display.config.Interpolation getInterpolation();
+    method public String getInterpolation();
     method @NonNull public final java.util.List<com.android.server.display.config.Point> getPoint();
-    method public void setInterpolation(com.android.server.display.config.Interpolation);
+    method public void setInterpolation(String);
   }
 
   public class Point {