diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index 9ccc563..47a6096 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -2213,7 +2213,7 @@
 
 #ifdef CONFIG_ARCH_OMAP15XX
 	/* Workaround to enable 115200 baud on OMAP1510 internal ports */
-	if (cpu_is_omap1510() && is_omap_port((unsigned int)up->port.membase)) {
+	if (cpu_is_omap1510() && is_omap_port(up)) {
 		if (baud == 115200) {
 			quot = 1;
 			serial_out(up, UART_OMAP_OSC_12M_SEL, 1);