1 files changed, 10 insertions, 6 deletions

diff --git a/arch/arm/mach-shmobile/setup-rcar-gen2.c b/arch/arm/mach-shmobile/setup-rcar-gen2.c
index 10604480f325..542c5a47173f 100644
--- a/arch/arm/mach-shmobile/setup-rcar-gen2.c
+++ b/arch/arm/mach-shmobile/setup-rcar-gen2.c
@@ -30,12 +30,16 @@
 
 u32 rcar_gen2_read_mode_pins(void)
 {
-        void __iomem *modemr = ioremap_nocache(MODEMR, 4);
-        u32 mode;
-
-        BUG_ON(!modemr);
-        mode = ioread32(modemr);
-        iounmap(modemr);
+        static u32 mode;
+        static bool mode_valid;
+
+        if (!mode_valid) {
+                void __iomem *modemr = ioremap_nocache(MODEMR, 4);
+                BUG_ON(!modemr);
+                mode = ioread32(modemr);
+                iounmap(modemr);
+                mode_valid = true;
+        }
 
         return mode;
 }