1 files changed, 2 insertions, 1 deletions

diff --git a/arch/mips/alchemy/common/usb.c b/arch/mips/alchemy/common/usb.c
index fcc695626117..2adc7edda49c 100644
--- a/arch/mips/alchemy/common/usb.c
+++ b/arch/mips/alchemy/common/usb.c
@@ -14,6 +14,7 @@
 #include <linux/module.h>
 #include <linux/spinlock.h>
 #include <linux/syscore_ops.h>
+#include <asm/cpu.h>
 #include <asm/mach-au1x00/au1000.h>
 
 /* control register offsets */
@@ -358,7 +359,7 @@ static inline int au1200_coherency_bug(void)
 {
 #if defined(CONFIG_DMA_COHERENT)
         /* Au1200 AB USB does not support coherent memory */
-        if (!(read_c0_prid() & 0xff)) {
+        if (!(read_c0_prid() & PRID_REV_MASK)) {
                 printk(KERN_INFO "Au1200 USB: this is chip revision AB !!\n");
                 printk(KERN_INFO "Au1200 USB: update your board or re-configure"
                                  " the kernel\n");