diff --git a/drivers/tty/serial/8250/8250.c b/drivers/tty/serial/8250/8250.c
index 6e1958a..9693d5a 100644
--- a/drivers/tty/serial/8250/8250.c
+++ b/drivers/tty/serial/8250/8250.c
@@ -980,14 +980,17 @@ static void autoconfig_16550a(struct uart_8250_port *up)
 		 */
 		serial_out(up, UART_IER, iersave | UART_IER_UUE);
 		if (serial_in(up, UART_IER) & UART_IER_UUE) {
-			/*
-			 * It's an Xscale.
-			 * We'll leave the UART_IER_UUE bit set to 1 (enabled).
-			 */
-			DEBUG_AUTOCONF("Xscale ");
-			up->port.type = PORT_XSCALE;
-			up->capabilities |= UART_CAP_UUE | UART_CAP_RTOIE;
-			return;
+			serial_out(up, UART_IER, iersave | UART_IER_RTOIE);
+			if (serial_in(up, UART_IER) & UART_IER_RTOIE) {
+				/*
+				 * It's an Xscale.
+				 * We'll leave the UART_IER_UUE bit set to 1 (enabled).
+				 */
+				DEBUG_AUTOCONF("Xscale ");
+				up->port.type = PORT_XSCALE;
+				up->capabilities |= UART_CAP_UUE | UART_CAP_RTOIE;
+				return;
+			}
 		}
 	} else {
 		/*