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[PATCHv3,23/35] ARM: OMAP2+: id: cache omap_type value

Message ID 1424891085-10392-24-git-send-email-t-kristo@ti.com (mailing list archive)
State New, archived
Headers show

Commit Message

Tero Kristo Feb. 25, 2015, 7:04 p.m. UTC 
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>
---
 arch/arm/mach-omap2/id.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
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Patch

diff --git a/arch/arm/mach-omap2/id.c b/arch/arm/mach-omap2/id.c
index 2a2f4d5..1f5949f 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 + 1;
+
+	if (val < OMAP2_DEVICETYPE_MASK)
+		return val;
 
 	if (cpu_is_omap24xx()) {
 		val = omap_ctrl_readl(OMAP24XX_CONTROL_STATUS);