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/pmac64-cpufreq.c b/drivers/cpufreq/pmac64-cpufreq.c
index 234b598..6a338f8 100644
--- a/drivers/cpufreq/pmac64-cpufreq.c
+++ b/drivers/cpufreq/pmac64-cpufreq.c
@@ -79,8 +79,6 @@
static int (*g5_switch_freq)(int speed_mode);
static int (*g5_query_freq)(void);
-static DEFINE_MUTEX(g5_switch_mutex);
-
static unsigned long transition_latency;
#ifdef CONFIG_PMAC_SMU
@@ -314,21 +312,7 @@
static int g5_cpufreq_target(struct cpufreq_policy *policy, unsigned int index)
{
- struct cpufreq_freqs freqs;
- int rc;
-
- mutex_lock(&g5_switch_mutex);
-
- freqs.old = g5_cpu_freqs[g5_pmode_cur].frequency;
- freqs.new = g5_cpu_freqs[index].frequency;
-
- cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
- rc = g5_switch_freq(index);
- cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
-
- mutex_unlock(&g5_switch_mutex);
-
- return rc;
+ return g5_switch_freq(index);
}
static unsigned int g5_cpufreq_get_speed(unsigned int cpu)