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SubjectRe: [PATCH v4 20/20] cpufreq: scmi: add support for fast frequency switching
On 03-11-17, 14:47, Sudeep Holla wrote:
> 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: "Rafael J. Wysocki" <rjw@rjwysocki.net>
> Cc: Viresh Kumar <viresh.kumar@linaro.org>
> Cc: linux-pm@vger.kernel.org
> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
> ---
> drivers/cpufreq/scmi-cpufreq.c | 16 ++++++++++++++++
> 1 file changed, 16 insertions(+)
>
> diff --git a/drivers/cpufreq/scmi-cpufreq.c b/drivers/cpufreq/scmi-cpufreq.c
> index b1057a13e6a7..91df5013f7b2 100644
> --- a/drivers/cpufreq/scmi-cpufreq.c
> +++ b/drivers/cpufreq/scmi-cpufreq.c
> @@ -64,6 +64,19 @@ scmi_cpufreq_set_target(struct cpufreq_policy *policy, unsigned int index)
> return perf_ops->freq_set(handle, priv->domain_id, freq, false);
> }
>
> +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))
> + return target_freq;
> +
> + return 0;
> +}
> +
> static int
> scmi_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask)
> {
> @@ -167,6 +180,7 @@ 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:
> @@ -183,6 +197,7 @@ static int scmi_cpufreq_exit(struct cpufreq_policy *policy)
> {
> struct scmi_data *priv = policy->driver_data;
>
> + policy->fast_switch_possible = false;

You don't need this.

> cpufreq_cooling_unregister(priv->cdev);
> dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &policy->freq_table);
> kfree(priv);
> @@ -226,6 +241,7 @@ 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,

Apart from that.

Acked-by: Viresh Kumar <viresh.kumar@linaro.org>

--
viresh

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