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ARM: 7653/2: do not scale loops_per_jiffy when using a constant delay clock 

When udelay() is implemented using an architected timer, it is wrong
to scale loops_per_jiffy when changing the CPU clock frequency since
the timer clock remains constant.

The lpj should probably become an implementation detail relevant to
the CPU loop based delay routine only and more confined to it. In the
mean time this is the minimal fix needed to have expected delays with
the timer based implementation when cpufreq is also in use.

Reported-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Nicolas Pitre <nico@linaro.org>
Tested-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Liviu Dudau <Liviu.Dudau@arm.com>
Cc: stable@vger.kernel.org
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Nicolas Pitre 2013-02-18 16:36:13 +01:00 committed by Russell King
parent 7c4e9ced42
commit 70264367a2
3 changed files with 5 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/arm/include/asm/delay.h
View File

@ -24,6 +24,7 @@ extern struct arm_delay_ops {
void (*delay)(unsigned long); void (*delay)(unsigned long);
void (*const_udelay)(unsigned long); void (*const_udelay)(unsigned long);
void (*udelay)(unsigned long); void (*udelay)(unsigned long);
bool const_clock;
} arm_delay_ops; } arm_delay_ops;
#define __delay(n) arm_delay_ops.delay(n) #define __delay(n) arm_delay_ops.delay(n)

3
arch/arm/kernel/smp.c
View File

@ -693,6 +693,9 @@ static int cpufreq_callback(struct notifier_block *nb,
if (freq->flags & CPUFREQ_CONST_LOOPS) if (freq->flags & CPUFREQ_CONST_LOOPS)
return NOTIFY_OK; return NOTIFY_OK;
if (arm_delay_ops.const_clock)
return NOTIFY_OK;
if (!per_cpu(l_p_j_ref, cpu)) { if (!per_cpu(l_p_j_ref, cpu)) {
per_cpu(l_p_j_ref, cpu) = per_cpu(l_p_j_ref, cpu) =
per_cpu(cpu_data, cpu).loops_per_jiffy; per_cpu(cpu_data, cpu).loops_per_jiffy;

1
arch/arm/lib/delay.c
View File

@ -77,6 +77,7 @@ void __init register_current_timer_delay(const struct delay_timer *timer)
arm_delay_ops.delay = __timer_delay; arm_delay_ops.delay = __timer_delay;
arm_delay_ops.const_udelay = __timer_const_udelay; arm_delay_ops.const_udelay = __timer_const_udelay;
arm_delay_ops.udelay = __timer_udelay; arm_delay_ops.udelay = __timer_udelay;
arm_delay_ops.const_clock = true;
delay_calibrated = true; delay_calibrated = true;
} else { } else {
pr_info("Ignoring duplicate/late registration of read_current_timer delay\n"); pr_info("Ignoring duplicate/late registration of read_current_timer delay\n");