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Date: Thu, 28 Sep 2017 14:11:46 +0100 From: Sudeep Holla <sudeep.holla@....com> To: ALKML <linux-arm-kernel@...ts.infradead.org>, LKML <linux-kernel@...r.kernel.org>, DTML <devicetree@...r.kernel.org> Cc: Sudeep Holla <sudeep.holla@....com>, Roy Franz <roy.franz@...ium.com>, Harb Abdulhamid <harba@...eaurora.org>, Nishanth Menon <nm@...com>, Arnd Bergmann <arnd@...db.de>, Loc Ho <lho@....com>, Alexey Klimov <alexey.klimov@....com>, Ryan Harkin <Ryan.Harkin@....com>, Jassi Brar <jassisinghbrar@...il.com>, "Rafael J. Wysocki" <rjw@...ysocki.net>, Viresh Kumar <viresh.kumar@...aro.org>, linux-pm@...r.kernel.org Subject: [PATCH v3 22/22] 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: "Rafael J. Wysocki" <rjw@...ysocki.net> Cc: Viresh Kumar <viresh.kumar@...aro.org> Cc: linux-pm@...r.kernel.org Signed-off-by: Sudeep Holla <sudeep.holla@....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 bc5385638eb4..067a39bd5167 100644 --- a/drivers/cpufreq/scmi-cpufreq.c +++ b/drivers/cpufreq/scmi-cpufreq.c @@ -65,6 +65,19 @@ 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) { @@ -168,6 +181,7 @@ 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: @@ -184,6 +198,7 @@ static int scmi_cpufreq_exit(struct cpufreq_policy *policy) { struct scmi_data *priv = policy->driver_data; + policy->fast_switch_possible = false; cpufreq_cooling_unregister(priv->cdev); dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &policy->freq_table); kfree(priv); @@ -227,6 +242,7 @@ 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, -- 2.7.4
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