[PATCHv6 22/34] ARM: OMAP2+: id: cache omap_type value
From: Tero Kristo <hidden>
Date: 2015-03-31 19:14:15
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 2a2f4d5..f8121db 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);
--
1.7.9.5