[PATCHv2 24/33] ARM: OMAP2+: id: cache omap_type value
From: Tero Kristo <hidden>
Date: 2015-02-13 16:12:43
Also in:
linux-omap
Subsystem:
arm port, omap2+ support, the rest · Maintainers:
Russell King, Aaro Koskinen, Andreas Kemnade, Kevin Hilman, Roger Quadros, Tony Lindgren, Linus Torvalds
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 <redacted> --- arch/arm/mach-omap2/id.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/arch/arm/mach-omap2/id.c b/arch/arm/mach-omap2/id.c
index c25feba..3ce76a7 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);
--
1.7.9.5