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ARM: 7685/1: delay: use private ticks_per_jiffy field for timer-based delay ops

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Commit 70264367a2 ("ARM: 7653/2: do not scale loops_per_jiffy when
using a constant delay clock") fixed a problem with our timer-based
delay loop, where loops_per_jiffy is scaled by cpufreq yet used directly
by the timer delay ops.

This patch fixes the problem in a more elegant way by keeping a private
ticks_per_jiffy field in the delay ops, independent of loops_per_jiffy
and therefore not subject to scaling. The loop-based delay continues to
use loops_per_jiffy directly, as it should.

Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Will Deacon
2013-03-28 11:17:55 +01:00
committed by Russell King
parent 93dc68876b
commit 6f3d90e556
3 changed files with 6 additions and 7 deletions
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3
arch/arm/kernel/smp.c
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@@ -673,9 +673,6 @@ static int cpufreq_callback(struct notifier_block *nb,
if (freq->flags & CPUFREQ_CONST_LOOPS)
return NOTIFY_OK;
if (arm_delay_ops.const_clock)
return NOTIFY_OK;
if (!per_cpu(l_p_j_ref, cpu)) {
per_cpu(l_p_j_ref, cpu) =
per_cpu(cpu_data, cpu).loops_per_jiffy;