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 11167cbb9..e0020f1e2 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
@@ -610,7 +610,7 @@ static unsigned int xhci_port_protocol ( struct xhci_host *xhci,
 			for ( i = 0 ; i < psic ; i++ ) {
 //				psi = readl ( xhci->cap + supported +
 //					      XHCI_SUPPORTED_PSI ( i ) );
-				psi = readl ( xhci->cap + supported +
+				psi = readl ( xhci->cap_addr + supported +
 					      XHCI_SUPPORTED_PSI ( i ) );
 				psiv = XHCI_SUPPORTED_PSI_VALUE ( psi );
 				USB_LOG_DBG(" %d:%s \r\n", psiv, xhci_speed_name ( psi ) );