cpufreq: acme: Add exynos_cpufreq_get_locked.

It is accompanied by a lock job to prevent
reading frequency during frequency change

Change-Id: Iaf163321dff7437ad215b200f10589225a73c4f7
Signed-off-by: Youngtae Lee <yt0729.lee@samsung.com>

diff --git a/drivers/cpufreq/exynos-acme.c b/drivers/cpufreq/exynos-acme.c
index 8bccc3485d9998fbc25de41482d1380e0c842b70..5e2da3343feb3741260797fded8d28f8d120e956 100644 (file)
--- a/drivers/cpufreq/exynos-acme.c
+++ b/drivers/cpufreq/exynos-acme.c
@@ -407,6 +407,16 @@ out:
        return ret;
 }
 
+static unsigned int exynos_cpufreq_get(unsigned int cpu)
+{
+       struct exynos_cpufreq_domain *domain = find_domain(cpu);
+
+       if (!domain)
+               return 0;
+
+       return get_freq(domain);
+}
+
 static int exynos_cpufreq_target(struct cpufreq_policy *policy,
                                        unsigned int target_freq,
                                        unsigned int relation)
@@ -538,7 +548,6 @@ static struct notifier_block exynos_cpufreq_pm = {
        .notifier_call = exynos_cpufreq_pm_notifier,
 };
 
-unsigned int exynos_cpufreq_get(unsigned int cpu);
 static struct cpufreq_driver exynos_driver = {
        .name           = "exynos_cpufreq",
        .flags          = CPUFREQ_STICKY | CPUFREQ_HAVE_GOVERNOR_PER_POLICY,
@@ -778,15 +787,23 @@ unsigned int exynos_cpufreq_get_max_freq(struct cpumask *mask)
 }
 EXPORT_SYMBOL(exynos_cpufreq_get_max_freq);
 
-unsigned int exynos_cpufreq_get(unsigned int cpu)
+unsigned int exynos_cpufreq_get_locked(unsigned int cpu)
 {
        struct exynos_cpufreq_domain *domain = find_domain(cpu);
 
        if (!domain)
                return 0;
 
+       /*
+        * It is accompanied by a lock job to prevent
+        * reading frequency during frequency change
+        */
+       mutex_lock(&domain->lock);
+       mutex_unlock(&domain->lock);
+
        return get_freq(domain);
 }
+EXPORT_SYMBOL(exynos_cpufreq_get_locked);
 
 /*********************************************************************
  *                          SYSFS INTERFACES                         *