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SubjectRe: [PATCH v4 20/20] cpufreq: scmi: add support for fast frequency switching
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On 07/11/17 06:19, Viresh Kumar wrote:
> 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.
>

OK, dropped now.

>> 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>
>

Thanks

--
Regards,
Sudeep

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