diff --git a/biometrics/fingerprint/aidl/default/FakeFingerprintEngine.cpp b/biometrics/fingerprint/aidl/default/FakeFingerprintEngine.cpp
index 4e80052..a7acf3d 100644
--- a/biometrics/fingerprint/aidl/default/FakeFingerprintEngine.cpp
+++ b/biometrics/fingerprint/aidl/default/FakeFingerprintEngine.cpp
@@ -62,12 +62,17 @@
         return;
     }
 
+    waitForFingerDown(cb, cancel);
+
     updateContext(WorkMode::kEnroll, cb, const_cast<std::future<void>&>(cancel), 0, hat);
 }
 
 void FakeFingerprintEngine::authenticateImpl(ISessionCallback* cb, int64_t operationId,
                                              const std::future<void>& cancel) {
     BEGIN_OP(0);
+
+    waitForFingerDown(cb, cancel);
+
     updateContext(WorkMode::kAuthenticate, cb, const_cast<std::future<void>&>(cancel), operationId,
                   keymaster::HardwareAuthToken());
 }
@@ -84,6 +89,8 @@
         return;
     }
 
+    waitForFingerDown(cb, cancel);
+
     updateContext(WorkMode::kDetectInteract, cb, const_cast<std::future<void>&>(cancel), 0,
                   keymaster::HardwareAuthToken());
 }
@@ -398,6 +405,7 @@
 
 ndk::ScopedAStatus FakeFingerprintEngine::onPointerUpImpl(int32_t /*pointerId*/) {
     BEGIN_OP(0);
+    mFingerIsDown = false;
     return ndk::ScopedAStatus::ok();
 }
 
@@ -533,4 +541,17 @@
     isLockoutTimerStarted = false;
     isLockoutTimerAborted = false;
 }
+
+void FakeFingerprintEngine::waitForFingerDown(ISessionCallback* cb,
+                                              const std::future<void>& cancel) {
+    while (!mFingerIsDown) {
+        if (shouldCancel(cancel)) {
+            LOG(ERROR) << "waitForFingerDown, Fail: cancel";
+            cb->onError(Error::CANCELED, 0 /* vendorCode */);
+            return;
+        }
+        SLEEP_MS(10);
+    }
+}
+
 }  // namespace aidl::android::hardware::biometrics::fingerprint
diff --git a/biometrics/fingerprint/aidl/default/Session.cpp b/biometrics/fingerprint/aidl/default/Session.cpp
index c06c931..0dd6603 100644
--- a/biometrics/fingerprint/aidl/default/Session.cpp
+++ b/biometrics/fingerprint/aidl/default/Session.cpp
@@ -249,6 +249,7 @@
 ndk::ScopedAStatus Session::onPointerDown(int32_t pointerId, int32_t x, int32_t y, float minor,
                                           float major) {
     LOG(INFO) << "onPointerDown";
+    mEngine->notifyFingerdown();
     mWorker->schedule(Callable::from([this, pointerId, x, y, minor, major] {
         mEngine->onPointerDownImpl(pointerId, x, y, minor, major);
         enterIdling();
diff --git a/biometrics/fingerprint/aidl/default/include/FakeFingerprintEngine.h b/biometrics/fingerprint/aidl/default/include/FakeFingerprintEngine.h
index 15d8360..0d53575 100644
--- a/biometrics/fingerprint/aidl/default/include/FakeFingerprintEngine.h
+++ b/biometrics/fingerprint/aidl/default/include/FakeFingerprintEngine.h
@@ -75,6 +75,7 @@
     enum class WorkMode : int8_t { kIdle = 0, kAuthenticate, kEnroll, kDetectInteract };
 
     WorkMode getWorkMode() { return mWorkMode; }
+    void notifyFingerdown() { mFingerIsDown = true; }
 
     virtual std::string toString() const {
         std::ostringstream os;
@@ -100,6 +101,7 @@
     keymaster::HardwareAuthToken mHat;
     std::future<void> mCancel;
     int64_t mOperationId;
+    bool mFingerIsDown;
 
   private:
     static constexpr int32_t FINGERPRINT_ACQUIRED_VENDOR_BASE = 1000;
@@ -109,6 +111,7 @@
     int32_t getRandomInRange(int32_t bound1, int32_t bound2);
     bool checkSensorLockout(ISessionCallback*);
     void clearLockout(ISessionCallback* cb);
+    void waitForFingerDown(ISessionCallback* cb, const std::future<void>& cancel);
 
     FakeLockoutTracker mLockoutTracker;
 
diff --git a/biometrics/fingerprint/aidl/default/tests/FakeFingerprintEngineTest.cpp b/biometrics/fingerprint/aidl/default/tests/FakeFingerprintEngineTest.cpp
index eedcae1..8b06c8e 100644
--- a/biometrics/fingerprint/aidl/default/tests/FakeFingerprintEngineTest.cpp
+++ b/biometrics/fingerprint/aidl/default/tests/FakeFingerprintEngineTest.cpp
@@ -185,6 +185,7 @@
     FingerprintHalProperties::enrollments({});
     FingerprintHalProperties::next_enrollment("4:0,0:true");
     keymaster::HardwareAuthToken hat{.mac = {2, 4}};
+    mEngine.notifyFingerdown();
     mEngine.enrollImpl(mCallback.get(), hat, mCancel.get_future());
     ASSERT_EQ(mEngine.getWorkMode(), FakeFingerprintEngine::WorkMode::kEnroll);
     mEngine.fingerDownAction();
@@ -202,6 +203,7 @@
     FingerprintHalProperties::next_enrollment(next);
     keymaster::HardwareAuthToken hat{.mac = {2, 4}};
     mCancel.set_value();
+    mEngine.notifyFingerdown();
     mEngine.enrollImpl(mCallback.get(), hat, mCancel.get_future());
     mEngine.fingerDownAction();
     ASSERT_EQ(Error::CANCELED, mCallback->mError);
@@ -215,6 +217,7 @@
     auto next = "2:0,0:false";
     FingerprintHalProperties::next_enrollment(next);
     keymaster::HardwareAuthToken hat{.mac = {2, 4}};
+    mEngine.notifyFingerdown();
     mEngine.enrollImpl(mCallback.get(), hat, mCancel.get_future());
     mEngine.fingerDownAction();
     ASSERT_EQ(Error::UNABLE_TO_PROCESS, mCallback->mError);
@@ -228,6 +231,7 @@
     FingerprintHalProperties::next_enrollment("4:0,5-[12,1013]:true");
     keymaster::HardwareAuthToken hat{.mac = {2, 4}};
     int32_t prevCnt = mCallback->mLastAcquiredCount;
+    mEngine.notifyFingerdown();
     mEngine.enrollImpl(mCallback.get(), hat, mCancel.get_future());
     mEngine.fingerDownAction();
     ASSERT_FALSE(FingerprintHalProperties::next_enrollment().has_value());
@@ -242,6 +246,7 @@
 TEST_F(FakeFingerprintEngineTest, Authenticate) {
     FingerprintHalProperties::enrollments({1, 2});
     FingerprintHalProperties::enrollment_hit(2);
+    mEngine.notifyFingerdown();
     mEngine.authenticateImpl(mCallback.get(), 0, mCancel.get_future());
     ASSERT_EQ(mEngine.getWorkMode(), FakeFingerprintEngine::WorkMode::kAuthenticate);
     mEngine.fingerDownAction();
@@ -255,6 +260,7 @@
     FingerprintHalProperties::enrollments({2});
     FingerprintHalProperties::enrollment_hit(2);
     mCancel.set_value();
+    mEngine.notifyFingerdown();
     mEngine.authenticateImpl(mCallback.get(), 0, mCancel.get_future());
     mEngine.fingerDownAction();
     ASSERT_EQ(Error::CANCELED, mCallback->mError);
@@ -264,6 +270,7 @@
 TEST_F(FakeFingerprintEngineTest, AuthenticateNotSet) {
     FingerprintHalProperties::enrollments({1, 2});
     FingerprintHalProperties::enrollment_hit({});
+    mEngine.notifyFingerdown();
     mEngine.authenticateImpl(mCallback.get(), 0, mCancel.get_future());
     mEngine.fingerDownAction();
     ASSERT_TRUE(mCallback->mAuthenticateFailed);
@@ -272,6 +279,7 @@
 TEST_F(FakeFingerprintEngineTest, AuthenticateNotEnrolled) {
     FingerprintHalProperties::enrollments({1, 2});
     FingerprintHalProperties::enrollment_hit(3);
+    mEngine.notifyFingerdown();
     mEngine.authenticateImpl(mCallback.get(), 0, mCancel.get_future());
     mEngine.fingerDownAction();
     ASSERT_TRUE(mCallback->mAuthenticateFailed);
@@ -282,6 +290,7 @@
     FingerprintHalProperties::enrollments({22, 2});
     FingerprintHalProperties::enrollment_hit(2);
     FingerprintHalProperties::lockout(true);
+    mEngine.notifyFingerdown();
     mEngine.authenticateImpl(mCallback.get(), 0, mCancel.get_future());
     mEngine.fingerDownAction();
     ASSERT_TRUE(mCallback->mLockoutPermanent);
@@ -290,6 +299,7 @@
 
 TEST_F(FakeFingerprintEngineTest, AuthenticateError8) {
     FingerprintHalProperties::operation_authenticate_error(8);
+    mEngine.notifyFingerdown();
     mEngine.authenticateImpl(mCallback.get(), 0, mCancel.get_future());
     mEngine.fingerDownAction();
     ASSERT_EQ(mCallback->mError, (Error)8);
@@ -298,6 +308,7 @@
 
 TEST_F(FakeFingerprintEngineTest, AuthenticateError9) {
     FingerprintHalProperties::operation_authenticate_error(1009);
+    mEngine.notifyFingerdown();
     mEngine.authenticateImpl(mCallback.get(), 0, mCancel.get_future());
     mEngine.fingerDownAction();
     ASSERT_EQ(mCallback->mError, (Error)7);
@@ -306,6 +317,7 @@
 
 TEST_F(FakeFingerprintEngineTest, AuthenticateFails) {
     FingerprintHalProperties::operation_authenticate_fails(true);
+    mEngine.notifyFingerdown();
     mEngine.authenticateImpl(mCallback.get(), 0, mCancel.get_future());
     mEngine.fingerDownAction();
     ASSERT_TRUE(mCallback->mAuthenticateFailed);
@@ -318,6 +330,7 @@
     FingerprintHalProperties::enrollment_hit(2);
     FingerprintHalProperties::operation_authenticate_acquired("4,1009");
     int32_t prevCount = mCallback->mLastAcquiredCount;
+    mEngine.notifyFingerdown();
     mEngine.authenticateImpl(mCallback.get(), 0, mCancel.get_future());
     mEngine.fingerDownAction();
     ASSERT_FALSE(mCallback->mAuthenticateFailed);
@@ -332,6 +345,7 @@
     FingerprintHalProperties::enrollments({1, 2});
     FingerprintHalProperties::enrollment_hit(2);
     FingerprintHalProperties::operation_detect_interaction_acquired("");
+    mEngine.notifyFingerdown();
     mEngine.detectInteractionImpl(mCallback.get(), mCancel.get_future());
     ASSERT_EQ(mEngine.getWorkMode(), FakeFingerprintEngine::WorkMode::kDetectInteract);
     mEngine.fingerDownAction();
@@ -345,6 +359,7 @@
     FingerprintHalProperties::enrollments({1, 2});
     FingerprintHalProperties::enrollment_hit(2);
     mCancel.set_value();
+    mEngine.notifyFingerdown();
     mEngine.detectInteractionImpl(mCallback.get(), mCancel.get_future());
     mEngine.fingerDownAction();
     ASSERT_EQ(Error::CANCELED, mCallback->mError);
@@ -355,6 +370,7 @@
     FingerprintHalProperties::detect_interaction(true);
     FingerprintHalProperties::enrollments({1, 2});
     FingerprintHalProperties::enrollment_hit({});
+    mEngine.notifyFingerdown();
     mEngine.detectInteractionImpl(mCallback.get(), mCancel.get_future());
     mEngine.fingerDownAction();
     ASSERT_EQ(1, mCallback->mInteractionDetectedCount);
@@ -363,6 +379,7 @@
 TEST_F(FakeFingerprintEngineTest, InteractionDetectNotEnrolled) {
     FingerprintHalProperties::enrollments({1, 2});
     FingerprintHalProperties::enrollment_hit(25);
+    mEngine.notifyFingerdown();
     mEngine.detectInteractionImpl(mCallback.get(), mCancel.get_future());
     mEngine.fingerDownAction();
     ASSERT_EQ(1, mCallback->mInteractionDetectedCount);
@@ -371,6 +388,7 @@
 TEST_F(FakeFingerprintEngineTest, InteractionDetectError) {
     FingerprintHalProperties::detect_interaction(true);
     FingerprintHalProperties::operation_detect_interaction_error(8);
+    mEngine.notifyFingerdown();
     mEngine.detectInteractionImpl(mCallback.get(), mCancel.get_future());
     mEngine.fingerDownAction();
     ASSERT_EQ(0, mCallback->mInteractionDetectedCount);
@@ -384,6 +402,7 @@
     FingerprintHalProperties::enrollment_hit(2);
     FingerprintHalProperties::operation_detect_interaction_acquired("4,1013");
     int32_t prevCount = mCallback->mLastAcquiredCount;
+    mEngine.notifyFingerdown();
     mEngine.detectInteractionImpl(mCallback.get(), mCancel.get_future());
     mEngine.fingerDownAction();
     ASSERT_EQ(1, mCallback->mInteractionDetectedCount);
diff --git a/biometrics/fingerprint/aidl/default/tests/FakeFingerprintEngineUdfpsTest.cpp b/biometrics/fingerprint/aidl/default/tests/FakeFingerprintEngineUdfpsTest.cpp
index f551899..5a30db1 100644
--- a/biometrics/fingerprint/aidl/default/tests/FakeFingerprintEngineUdfpsTest.cpp
+++ b/biometrics/fingerprint/aidl/default/tests/FakeFingerprintEngineUdfpsTest.cpp
@@ -145,6 +145,7 @@
 TEST_F(FakeFingerprintEngineUdfpsTest, authenticate) {
     std::shared_ptr<TestSessionCallback> cb = ndk::SharedRefBase::make<TestSessionCallback>();
     std::promise<void> cancel;
+    mEngine.notifyFingerdown();
     mEngine.authenticateImpl(cb.get(), 1, cancel.get_future());
     ASSERT_TRUE(mEngine.getWorkMode() == FakeFingerprintEngineUdfps::WorkMode::kAuthenticate);
     mEngine.onPointerDownImpl(1, 2, 3, 4.0, 5.0);
@@ -158,6 +159,7 @@
     std::promise<void> cancel;
     keymaster::HardwareAuthToken hat{.mac = {5, 6}};
     FingerprintHalProperties::next_enrollment("5:0,0:true");
+    mEngine.notifyFingerdown();
     mEngine.enrollImpl(cb.get(), hat, cancel.get_future());
     ASSERT_TRUE(mEngine.getWorkMode() == FakeFingerprintEngineUdfps::WorkMode::kEnroll);
     mEngine.onPointerDownImpl(1, 2, 3, 4.0, 5.0);
@@ -173,6 +175,7 @@
     FingerprintHalProperties::operation_detect_interaction_acquired("");
     std::shared_ptr<TestSessionCallback> cb = ndk::SharedRefBase::make<TestSessionCallback>();
     std::promise<void> cancel;
+    mEngine.notifyFingerdown();
     mEngine.detectInteractionImpl(cb.get(), cancel.get_future());
     ASSERT_TRUE(mEngine.getWorkMode() == FakeFingerprintEngineUdfps::WorkMode::kDetectInteract);
     mEngine.onPointerDownImpl(1, 2, 3, 4.0, 5.0);