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Commit 02f208c5 authored by Sudeep Holla's avatar Sudeep Holla
Browse files

cpufreq: scmi: add support for fast frequency switching 



The cpufreq core provides option for drivers to implement fast_switch
callback which is invoked for frequency switching from interrupt context.

This patch adds support for fast_switch callback in SCMI cpufreq driver
by making use of polling based SCMI transfer. It also sets the flag
fast_switch_possible.

Cc: linux-pm@vger.kernel.org
Acked-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: default avatarSudeep Holla <sudeep.holla@arm.com>
parent 99d6bdf3

drivers/cpufreq/scmi-cpufreq.c

+18 −0
Original line number Diff line number Diff line
@@ -61,6 +61,22 @@ scmi_cpufreq_set_target(struct cpufreq_policy *policy, unsigned int index) 
	return ret;

}



static unsigned int scmi_cpufreq_fast_switch(struct cpufreq_policy *policy,

					     unsigned int target_freq)

{

	struct scmi_data *priv = policy->driver_data;

	struct scmi_perf_ops *perf_ops = handle->perf_ops;



	if (!perf_ops->freq_set(handle, priv->domain_id,

				target_freq * 1000, true)) {

		arch_set_freq_scale(policy->related_cpus, target_freq,

				    policy->cpuinfo.max_freq);

		return target_freq;

	}



	return 0;

}



static int

scmi_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask)

{
@@ -160,6 +176,7 @@ static int scmi_cpufreq_init(struct cpufreq_policy *policy) 


	policy->cpuinfo.transition_latency = latency;



	policy->fast_switch_possible = true;

	return 0;



out_free_cpufreq_table:
@@ -198,6 +215,7 @@ static struct cpufreq_driver scmi_cpufreq_driver = { 
	.verify	= cpufreq_generic_frequency_table_verify,

	.attr	= cpufreq_generic_attr,

	.target_index	= scmi_cpufreq_set_target,

	.fast_switch	= scmi_cpufreq_fast_switch,

	.get	= scmi_cpufreq_get_rate,

	.init	= scmi_cpufreq_init,

	.exit	= scmi_cpufreq_exit,