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ARM: l2c: only write the auxiliary control register if required

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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 <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2014-03-17 20:10:31 +00:00
parent 17f3f99fab
commit 9a07f27bc5
1 changed files with 3 additions and 1 deletions
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4
arch/arm/mm/cache-l2x0.c
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@ -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);