diff --git a/usb/usb/Usb.cpp b/usb/usb/Usb.cpp
index 3944372..011c5e8 100644
--- a/usb/usb/Usb.cpp
+++ b/usb/usb/Usb.cpp
@@ -126,6 +126,9 @@ AltModeData::DisplayPortAltModeData constructAltModeData(string hpd, string pin_
 #define GL852G_PRODUCT_ID1 0x0608
 #define GL852G_PRODUCT_ID2 0x0610
 #define GL852G_VENDOR_CMD_REQ 0xe3
+// GL852G port 1 and port 2 JK level default settings
+#define GL852G_VENDOR_CMD_VALUE_DEFAULT 0x0008
+#define GL852G_VENDOR_CMD_INDEX_DEFAULT 0x0404
 
 ScopedAStatus Usb::enableUsbData(const string& in_portName, bool in_enable,
         int64_t in_transactionId) {
@@ -521,6 +524,61 @@ void updatePortStatus(android::hardware::usb::Usb *usb) {
     queryVersionHelper(usb, &currentPortStatus);
 }
 
+static int usbDeviceRemoved(const char *devname, void* client_data) {
+    return 0;
+}
+
+static int usbDeviceAdded(const char *devname, void* client_data) {
+    uint16_t vendorId, productId;
+    struct usb_device *device;
+    ::aidl::android::hardware::usb::Usb *usb;
+    int value, index;
+
+    device = usb_device_open(devname);
+    if (!device) {
+        ALOGE("usb_device_open failed\n");
+        return 0;
+    }
+
+    usb = (::aidl::android::hardware::usb::Usb *)client_data;
+    value = usb->mUsbHubVendorCmdValue;
+    index = usb->mUsbHubVendorCmdIndex;
+
+    // The vendor cmd only applies to USB Hubs of Genesys Logic, Inc.
+    // The request field of vendor cmd is fixed to 0xe3.
+    vendorId = usb_device_get_vendor_id(device);
+    productId = usb_device_get_product_id(device);
+    if (vendorId == GL852G_VENDOR_ID &&
+        (productId == GL852G_PRODUCT_ID1 || productId == GL852G_PRODUCT_ID2)) {
+        int ret = usb_device_control_transfer(device,
+            USB_DIR_OUT | USB_TYPE_VENDOR, GL852G_VENDOR_CMD_REQ, value, index,
+            NULL, 0, CTRL_TRANSFER_TIMEOUT_MSEC);
+        ALOGI("USB hub vendor cmd %s (wValue 0x%x, wIndex 0x%x, return %d)\n",
+                ret? "failed" : "succeeded", value, index, ret);
+    }
+
+    usb_device_close(device);
+
+    return 0;
+}
+
+void *usbHostWork(void *param) {
+    struct usb_host_context *ctx;
+
+    ALOGI("creating USB host thread\n");
+
+    ctx = usb_host_init();
+    if (!ctx) {
+        ALOGE("usb_host_init failed\n");
+        return NULL;
+    }
+
+    // This will never return, it will keep monitoring USB sysfs inotify events
+    usb_host_run(ctx, usbDeviceAdded, usbDeviceRemoved, NULL, param);
+
+    return NULL;
+}
+
 Usb::Usb()
     : mLock(PTHREAD_MUTEX_INITIALIZER),
       mRoleSwitchLock(PTHREAD_MUTEX_INITIALIZER),
@@ -542,7 +600,9 @@ Usb::Usb()
       mDisplayPortPollRunning(false),
       mDisplayPortPollStarting(false),
       mDisplayPortCVLock(PTHREAD_MUTEX_INITIALIZER),
-      mDisplayPortLock(PTHREAD_MUTEX_INITIALIZER) {
+      mDisplayPortLock(PTHREAD_MUTEX_INITIALIZER),
+      mUsbHubVendorCmdValue(GL852G_VENDOR_CMD_VALUE_DEFAULT),
+      mUsbHubVendorCmdIndex(GL852G_VENDOR_CMD_INDEX_DEFAULT) {
     pthread_condattr_t attr;
     if (pthread_condattr_init(&attr)) {
         ALOGE("pthread_condattr_init failed: %s", strerror(errno));
@@ -579,6 +639,10 @@ Usb::Usb()
         ALOGE("mDisplayPortActivateTimer timerfd failed: %s", strerror(errno));
         abort();
     }
+    if (pthread_create(&mUsbHost, NULL, usbHostWork, this)) {
+        ALOGE("pthread creation failed %d\n", errno);
+        abort();
+    }
 
     ALOGI("feature flag enable_usb_data_compliance_warning: %d",
           usb_flags::enable_usb_data_compliance_warning());
@@ -1950,82 +2014,6 @@ void Usb::shutdownDisplayPortPoll(bool force) {
     }
 }
 
-struct hub_vendor_cmd {
-    // wValue filed of standard device request
-    int value;
-    // wIndex field of standard device request
-    int index;
-    // Output pipe to shell command
-    int out;
-    // Whether the hub is found
-    bool found;
-};
-
-static int usbDeviceAdded(const char *devname, void* client_data) {
-    struct hub_vendor_cmd *cmd = (struct hub_vendor_cmd *)client_data;
-    uint16_t vendorId, productId;
-    struct usb_device *device = usb_device_open(devname);
-
-    if (!device) {
-        dprintf(cmd->out, "usb_device_open failed\n");
-        return 0;
-    }
-
-    // The vendor cmd only applies to USB Hubs of Genesys Logic, Inc.
-    // The request field of vendor cmd is fixed to 0xe3.
-    vendorId = usb_device_get_vendor_id(device);
-    productId = usb_device_get_product_id(device);
-    if (vendorId == GL852G_VENDOR_ID &&
-        (productId == GL852G_PRODUCT_ID1 || productId == GL852G_PRODUCT_ID2)) {
-        int ret = usb_device_control_transfer(
-            device, USB_DIR_OUT | USB_TYPE_VENDOR,
-            GL852G_VENDOR_CMD_REQ, cmd->value, cmd->index, NULL, 0,
-            CTRL_TRANSFER_TIMEOUT_MSEC);
-        dprintf(cmd->out, "Vendor cmd %s (wValue %x, wIndex %x, return %d)\n",
-                ret? "failed" : "succeeded", cmd->value, cmd->index, ret);
-        // Stop iterating through usb devices once the hub is found.
-        cmd->found = true;
-        return 1;
-    }
-
-    return 0;
-}
-
-static int usbDiscoveryDone(void *client_data)
-{
-    struct hub_vendor_cmd *cmd = (struct hub_vendor_cmd *)client_data;
-
-    dprintf(cmd->out, "Done USB discovery, hub %s found\n",
-            cmd->found ? "is" : "not");
-
-    return 1;
-}
-
-static status_t sendHubVendorCmd(int out, Vector<String8>& args) {
-    if (args.size() < 3) {
-        dprintf(out, "Incorrect number of argument supplied\n");
-        return ::android::UNKNOWN_ERROR;
-    }
-    struct hub_vendor_cmd cmd = {
-      .value = std::stoi(args[1].c_str(), NULL, 16),
-      .index = std::stoi(args[2].c_str(), NULL, 16),
-      .out = out,
-      .found = false
-    };
-
-    struct usb_host_context *ctx;
-    ctx = usb_host_init();
-    if (!ctx) {
-        dprintf(out, "usb_host_init failed\n");
-        return ::android::UNKNOWN_ERROR;
-    }
-
-    usb_host_run(ctx, usbDeviceAdded, NULL, usbDiscoveryDone, &cmd);
-    usb_host_cleanup(ctx);
-
-    return ::android::NO_ERROR;
-}
-
 status_t Usb::handleShellCommand(int in, int out, int err, const char** argv,
                                  uint32_t argc) {
     uid_t uid = AIBinder_getCallingUid();
@@ -2041,13 +2029,28 @@ status_t Usb::handleShellCommand(int in, int out, int err, const char** argv,
 
     if (argc >= 1) {
         if (!utf8Args[0].compare(String8("hub-vendor-cmd"))) {
-            return sendHubVendorCmd(out, utf8Args);
+            if (utf8Args.size() < 3) {
+                dprintf(out, "Incorrect number of argument supplied\n");
+                return ::android::UNKNOWN_ERROR;
+            }
+            int value, index;
+            if (!::android::base::ParseInt(utf8Args[1].c_str(), &value) ||
+                !::android::base::ParseInt(utf8Args[2].c_str(), &index)) {
+                dprintf(out, "Fail to parse arguments\n");
+                return ::android::UNKNOWN_ERROR;
+            }
+            mUsbHubVendorCmdValue = value;
+            mUsbHubVendorCmdIndex = index;
+            ALOGI("USB hub vendor cmd update (wValue 0x%x, wIndex 0x%x)\n",
+                  mUsbHubVendorCmdValue, mUsbHubVendorCmdIndex);
+            return ::android::NO_ERROR;
         }
     }
 
     dprintf(out, "usage: adb shell cmd hub-vendor-cmd VALUE INDEX\n"
-                 "  VALUE wValue field in hex format, e.g. f321\n"
-                 "  INDEX wIndex field in hex format, e.g. f321\n");
+                 "  VALUE wValue field in hex format, e.g. 0xf321\n"
+                 "  INDEX wIndex field in hex format, e.g. 0xf321\n"
+                 "  The settings take effect next time the hub is enabled\n");
 
     return ::android::NO_ERROR;
 }
diff --git a/usb/usb/Usb.h b/usb/usb/Usb.h
index 91eea4f..96af846 100644
--- a/usb/usb/Usb.h
+++ b/usb/usb/Usb.h
@@ -167,10 +167,15 @@ struct Usb : public BnUsb {
      */
     bool mPartnerSupportsDisplayPort;
 
+    // Usb hub vendor command settings for JK level tuning
+    int mUsbHubVendorCmdValue;
+    int mUsbHubVendorCmdIndex;
+
   private:
     pthread_t mPoll;
     pthread_t mDisplayPortPoll;
     pthread_t mDisplayPortShutdownHelper;
+    pthread_t mUsbHost;
 };
 
 } // namespace usb