From mboxrd@z Thu Jan 1 00:00:00 1970 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753616AbeABOnv (ORCPT + 1 other); Tue, 2 Jan 2018 09:43:51 -0500 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70]:39948 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753589AbeABOnq (ORCPT ); Tue, 2 Jan 2018 09:43:46 -0500 From: Sudeep Holla To: ALKML , LKML , DTML Cc: Sudeep Holla , Roy Franz , Harb Abdulhamid , Nishanth Menon , Arnd Bergmann , Loc Ho , Alexey Klimov , Ryan Harkin , Jassi Brar , linux-pm@vger.kernel.org Subject: [PATCH v5 20/20] cpufreq: scmi: add support for fast frequency switching Date: Tue, 2 Jan 2018 14:42:42 +0000 Message-Id: <1514904162-11201-21-git-send-email-sudeep.holla@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1514904162-11201-1-git-send-email-sudeep.holla@arm.com> References: <1514904162-11201-1-git-send-email-sudeep.holla@arm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return-Path: 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: Rafael J. Wysocki Acked-by: Viresh Kumar Signed-off-by: Sudeep Holla --- drivers/cpufreq/scmi-cpufreq.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/drivers/cpufreq/scmi-cpufreq.c b/drivers/cpufreq/scmi-cpufreq.c index 0ee9335d0063..d0a82d7c6fd4 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) { @@ -163,6 +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: @@ -222,6 +236,7 @@ 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