diff --git a/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/port/xhci/xhci.c b/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/port/xhci/xhci.c
index 292af3f2c..11167cbb9 100644
--- a/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/port/xhci/xhci.c
+++ b/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/port/xhci/xhci.c
@@ -522,7 +522,8 @@ static unsigned int xhci_supported_protocol ( struct xhci_host *xhci,
 							 supported ) ) ) {
 
 		/* Determine port range */
-		ports = readl ( xhci->cap + supported + XHCI_SUPPORTED_PORTS );
+//		ports = readl ( xhci->cap + supported + XHCI_SUPPORTED_PORTS );
+		ports = readl ( xhci->cap_addr + supported + XHCI_SUPPORTED_PORTS );
 		offset = XHCI_SUPPORTED_PORTS_OFFSET ( ports );
 		count = XHCI_SUPPORTED_PORTS_COUNT ( ports );