From 9a07f27bc5ff2e36400e605d99cc1e129582a0ca Mon Sep 17 00:00:00 2001 From: Russell King Date: Mon, 17 Mar 2014 20:10:31 +0000 Subject: [PATCH] ARM: l2c: only write the auxiliary control register if required Avoid unnecessary writes to the auxiliary control register if the register already contains the required value. This allows us to avoid invoking the platforms secure monitor code unnecessarily. Signed-off-by: Russell King --- arch/arm/mm/cache-l2x0.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c index fc609550b7fa..1c947b4c7f05 100644 --- a/arch/arm/mm/cache-l2x0.c +++ b/arch/arm/mm/cache-l2x0.c @@ -92,7 +92,9 @@ static void l2c_enable(void __iomem *base, u32 aux, unsigned num_lock) { unsigned long flags; - writel_relaxed(aux, base + L2X0_AUX_CTRL); + /* Only write the aux register if it needs changing */ + if (readl_relaxed(base + L2X0_AUX_CTRL) != aux) + writel_relaxed(aux, base + L2X0_AUX_CTRL); l2c_unlock(base, num_lock); -- 2.20.1