diff --git a/common/usb_hc.h b/common/usb_hc.h
index fbf8eef8..bc70d6b7 100644
--- a/common/usb_hc.h
+++ b/common/usb_hc.h
@@ -59,12 +59,19 @@ struct usbh_endpoint_cfg {
  * @{
  */
 
+/**
+ * @brief usb host software init, used for global reset.
+ *
+ * @return int
+ */
+int usb_hc_sw_init(void);
+
 /**
  * @brief usb host controller hardware init.
  *
  * @return int
  */
-int usb_hc_init(void);
+int usb_hc_hw_init(void);
 
 /**
  * @brief get port connect status
@@ -144,11 +151,12 @@ int usbh_control_transfer(usbh_epinfo_t ep, struct usb_setup_packet *setup, uint
  *   of bytes successfully transferred.  On a failure, a negated errno value
  *   is returned that indicates the nature of the failure:
  *
- *     EAGAIN - If devices NAKs the transfer (or NYET or other error where
+ *     -EAGAIN - If devices NAKs the transfer (or NYET or other error where
  *              it may be appropriate to restart the entire transaction).
- *     EPERM  - If the endpoint stalls
- *     EIO    - On a TX or data toggle error
- *     EPIPE  - Overrun errors
+ *     -EPERM  - If the endpoint stalls
+ *     -EIO    - On a TX or data toggle error
+ *     -EPIPE  - Overrun errors
+ *     -ETIMEDOUT  - Sem wait timeout
  *
  */
 int usbh_ep_bulk_transfer(usbh_epinfo_t ep, uint8_t *buffer, uint32_t buflen, uint32_t timeout);
@@ -166,11 +174,12 @@ int usbh_ep_bulk_transfer(usbh_epinfo_t ep, uint8_t *buffer, uint32_t buflen, ui
  *   of bytes successfully transferred.  On a failure, a negated errno value
  *   is returned that indicates the nature of the failure:
  *
- *     EAGAIN - If devices NAKs the transfer (or NYET or other error where
+ *     -EAGAIN - If devices NAKs the transfer (or NYET or other error where
  *              it may be appropriate to restart the entire transaction).
- *     EPERM  - If the endpoint stalls
- *     EIO    - On a TX or data toggle error
- *     EPIPE  - Overrun errors
+ *     -EPERM  - If the endpoint stalls
+ *     -EIO    - On a TX or data toggle error
+ *     -EPIPE  - Overrun errors
+ *     -ETIMEDOUT  - Sem wait timeout
  *
  */
 int usbh_ep_intr_transfer(usbh_epinfo_t ep, uint8_t *buffer, uint32_t buflen, uint32_t timeout);
diff --git a/core/usbh_core.c b/core/usbh_core.c
index 93cd1bf3..26a495b4 100644
--- a/core/usbh_core.c
+++ b/core/usbh_core.c
@@ -745,13 +745,15 @@ static void usbh_portchange_detect_thread(void *argument)
 {
     struct usbh_hubport *hport = NULL;
 
+    usb_hc_sw_init();
+    
     for (uint8_t port = USBH_HUB_PORT_START_INDEX; port <= CONFIG_USBHOST_RHPORTS; port++) {
         usbh_core_cfg.rhport[port - 1].hport.port = port;
         usbh_core_cfg.rhport[port - 1].devgen.next = 1;
         usbh_hport_activate(&usbh_core_cfg.rhport[port - 1].hport);
     }
 
-    usb_hc_init();
+    usb_hc_hw_init();
 
     while (1) {
         usbh_portchange_wait(&hport);
@@ -844,9 +846,8 @@ int usbh_initialize(void)
     usbh_class_info_table_end = (struct usbh_class_info *)(class_info_table[0] + (sizeof(class_info_table) / sizeof(class_info_table[0])));
 #endif
 
-#ifdef CONFIG_USBHOST_HUB
     usbh_workq_initialize();
-#endif
+
     usbh_core_cfg.pscevent = usb_osal_event_create();
     if (usbh_core_cfg.pscevent == NULL) {
         return -1;