cpufreq: Implement cpufreq_generic_suspend()
Multiple platforms need to set CPUs to a particular frequency before
suspending the system, so provide a common infrastructure for them.
Those platforms only need to point their ->suspend callback pointers
to the generic routine.
Tested-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
[rjw: Changelog]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 289a407..61dd72b 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1567,6 +1567,32 @@
.remove_dev = cpufreq_remove_dev,
};
+/*
+ * In case platform wants some specific frequency to be configured
+ * during suspend..
+ */
+int cpufreq_generic_suspend(struct cpufreq_policy *policy)
+{
+ int ret;
+
+ if (!policy->suspend_freq) {
+ pr_err("%s: suspend_freq can't be zero\n", __func__);
+ return -EINVAL;
+ }
+
+ pr_debug("%s: Setting suspend-freq: %u\n", __func__,
+ policy->suspend_freq);
+
+ ret = __cpufreq_driver_target(policy, policy->suspend_freq,
+ CPUFREQ_RELATION_H);
+ if (ret)
+ pr_err("%s: unable to set suspend-freq: %u. err: %d\n",
+ __func__, policy->suspend_freq, ret);
+
+ return ret;
+}
+EXPORT_SYMBOL(cpufreq_generic_suspend);
+
/**
* cpufreq_suspend() - Suspend CPUFreq governors
*