ARM: OMAP2+: id: cache omap_type value

There is no need to read the register with every invocation of the function,
as the value is constant. Thus, cache the value in a static variable.

Signed-off-by: Tero Kristo <t-kristo@ti.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/arch/arm/mach-omap2/id.c b/arch/arm/mach-omap2/id.c
index 2a2f4d56e4c8..f8121dbc9d48 100644
--- a/arch/arm/mach-omap2/id.c
+++ b/arch/arm/mach-omap2/id.c
@@ -52,7 +52,10 @@ EXPORT_SYMBOL(omap_rev);
 
 int omap_type(void)
 {
-        u32 val = 0;
+        static u32 val = OMAP2_DEVICETYPE_MASK;
+
+        if (val < OMAP2_DEVICETYPE_MASK)
+                return val;
 
         if (cpu_is_omap24xx()) {
                 val = omap_ctrl_readl(OMAP24XX_CONTROL_STATUS);