cpufreq: move freq change notifications to cpufreq core
Most of the drivers do following in their ->target_index() routines:
struct cpufreq_freqs freqs;
freqs.old = old freq...
freqs.new = new freq...
cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
/* Change rate here */
cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
This is replicated over all cpufreq drivers today and there doesn't exists a
good enough reason why this shouldn't be moved to cpufreq core instead.
There are few special cases though, like exynos5440, which doesn't do everything
on the call to ->target_index() routine and call some kind of bottom halves for
doing this work, work/tasklet/etc..
They may continue doing notification from their own code as flag:
CPUFREQ_ASYNC_NOTIFICATION is already set for them.
All drivers are also modified in this patch to avoid breaking 'git bisect', as
double notification would happen otherwise.
Acked-by: Hans-Christian Egtvedt <egtvedt@samfundet.no>
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Russell King <linux@arm.linux.org.uk>
Acked-by: Stephen Warren <swarren@nvidia.com>
Tested-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Reviewed-by: Lan Tianyu <tianyu.lan@intel.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/drivers/cpufreq/speedstep-centrino.c b/drivers/cpufreq/speedstep-centrino.c
index c51ec8c..4e1daca 100644
--- a/drivers/cpufreq/speedstep-centrino.c
+++ b/drivers/cpufreq/speedstep-centrino.c
@@ -423,9 +423,8 @@
static int centrino_target(struct cpufreq_policy *policy, unsigned int index)
{
unsigned int msr, oldmsr = 0, h = 0, cpu = policy->cpu;
- struct cpufreq_freqs freqs;
int retval = 0;
- unsigned int j, first_cpu, tmp;
+ unsigned int j, first_cpu;
struct cpufreq_frequency_table *op_points;
cpumask_var_t covered_cpus;
@@ -473,16 +472,6 @@
goto out;
}
- freqs.old = extract_clock(oldmsr, cpu, 0);
- freqs.new = extract_clock(msr, cpu, 0);
-
- pr_debug("target=%dkHz old=%d new=%d msr=%04x\n",
- op_points->frequency, freqs.old, freqs.new,
- msr);
-
- cpufreq_notify_transition(policy, &freqs,
- CPUFREQ_PRECHANGE);
-
first_cpu = 0;
/* all but 16 LSB are reserved, treat them with care */
oldmsr &= ~0xffff;
@@ -497,8 +486,6 @@
cpumask_set_cpu(j, covered_cpus);
}
- cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
-
if (unlikely(retval)) {
/*
* We have failed halfway through the frequency change.
@@ -509,12 +496,6 @@
for_each_cpu(j, covered_cpus)
wrmsr_on_cpu(j, MSR_IA32_PERF_CTL, oldmsr, h);
-
- tmp = freqs.new;
- freqs.new = freqs.old;
- freqs.old = tmp;
- cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
- cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
}
retval = 0;