diff --git a/common/cmd_usb.c b/common/cmd_usb.c
index c192498..27813f0 100644
--- a/common/cmd_usb.c
+++ b/common/cmd_usb.c
@@ -441,6 +441,26 @@ static int do_usb_stop_keyboard(int force)
 	return 0;
 }
 
+static void do_usb_start(void)
+{
+	bootstage_mark_name(BOOTSTAGE_ID_USB_START, "usb_start");
+
+	if (usb_init() < 0)
+		return;
+
+#ifdef CONFIG_USB_STORAGE
+	/* try to recognize storage devices immediately */
+	usb_stor_curr_dev = usb_stor_scan(1);
+#endif
+#ifdef CONFIG_USB_HOST_ETHER
+	/* try to recognize ethernet devices immediately */
+	usb_ether_curr_dev = usb_host_eth_scan(1);
+#endif
+#ifdef CONFIG_USB_KEYBOARD
+	drv_usb_kbd_init();
+#endif
+}
+
 /******************************************************************************
  * usb command intepreter
  */
@@ -457,26 +477,20 @@ static int do_usb(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	if (argc < 2)
 		return CMD_RET_USAGE;
 
-	if ((strncmp(argv[1], "reset", 5) == 0) ||
-		 (strncmp(argv[1], "start", 5) == 0)) {
-		bootstage_mark_name(BOOTSTAGE_ID_USB_START, "usb_start");
+	if (strncmp(argv[1], "start", 5) == 0) {
+		if (usb_started)
+			return 0; /* Already started */
+		printf("starting USB...\n");
+		do_usb_start();
+		return 0;
+	}
+
+	if (strncmp(argv[1], "reset", 5) == 0) {
+		printf("resetting USB...\n");
 		if (do_usb_stop_keyboard(1) != 0)
 			return 1;
 		usb_stop();
-		printf("(Re)start USB...\n");
-		if (usb_init() >= 0) {
-#ifdef CONFIG_USB_STORAGE
-			/* try to recognize storage devices immediately */
-			usb_stor_curr_dev = usb_stor_scan(1);
-#endif
-#ifdef CONFIG_USB_HOST_ETHER
-			/* try to recognize ethernet devices immediately */
-			usb_ether_curr_dev = usb_host_eth_scan(1);
-#endif
-#ifdef CONFIG_USB_KEYBOARD
-			drv_usb_kbd_init();
-#endif
-		}
+		do_usb_start();
 		return 0;
 	}
 	if (strncmp(argv[1], "stop", 4) == 0) {