From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x226QyGoGC9nGpcE8CglYCVyshtnwO9BKz6h5czvxVX/8OjR91kTDJW1dSgg3OuUmwN8fyXLS ARC-Seal: i=1; a=rsa-sha256; t=1519403081; cv=none; d=google.com; s=arc-20160816; b=s+O49ZmVD9xqxQLSbbYG/cF+VwGGvFxocuRutYvZibU+91niv+D9imnr0ddyzoM8j1 4ZB+KJsNREdGMCezGi7arStxMiNrvCAGs+Y9tP9lfxcYCdwZGgGazc9DCS3Na3zIlEho ihXQlchf0ucIT0HuBg6EOqNQcfLp0NQsOJaexrZV8qE8EXN4ccEKilfFEQT2YlWkD1IR C0nfBHQXdWuGqmA/uu3l8NBMjcTWpl6uF3FwnsWm6OCfQjOY7gWOVPewCpUkhr4ZV6KH G1GKpR4VgrGI6Pj1aBPVRjZff82KwZG/cUBjg+zZMb04k/APKoPycf1iFeZqgjN05Cs5 +diw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=references:in-reply-to:message-id:date:subject:cc:to:from :arc-authentication-results; bh=RSbsANuSxBwcm+kRTuCfGyuJwHa/xjk6xBT0hXu0WcE=; b=YSpLHnuJO4mS0F/ingKfCUt5cPGjLrldy7pPnWgUyzqr9hfPNELfAobjLjE2nYnnsd NYMzBo2TvYh+WKwmLuUkt6nYHluEaaG1oMbU7983i57WpRJ0wF6if50PNzZdFzMpwN12 joqAJota9PQR4VExwery9uLopxL0W1cn2eXlr6pN46tDdPa12k+FQtGctcJhOPKkm48c gWOgSl86mN/ltbZBYEUTRTHhohDFuRRO4r6wrRn44pwmmGPVy3GG21s3QQBAULLz0bjp wz2s4WOJvl1fNZm+YWruTE6pMeXwjYJIGbiTKbEqFnPzNMkvqk9DGbmXm9VPBejBjrKw u16w== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of sudeep.holla@arm.com designates 217.140.101.70 as permitted sender) smtp.mailfrom=sudeep.holla@arm.com Authentication-Results: mx.google.com; spf=pass (google.com: domain of sudeep.holla@arm.com designates 217.140.101.70 as permitted sender) smtp.mailfrom=sudeep.holla@arm.com From: Sudeep Holla To: ALKML , LKML , DTML Cc: Sudeep Holla , Alexey Klimov , Arnd Bergmann , Greg Kroah-Hartman , linux-pm@vger.kernel.org Subject: [PATCH v6 20/20] cpufreq: scmi: add support for fast frequency switching Date: Fri, 23 Feb 2018 16:23:50 +0000 Message-Id: <1519403030-21189-21-git-send-email-sudeep.holla@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1519403030-21189-1-git-send-email-sudeep.holla@arm.com> References: <1519403030-21189-1-git-send-email-sudeep.holla@arm.com> X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1593209605546143756?= X-GMAIL-MSGID: =?utf-8?q?1593209605546143756?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 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 | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/drivers/cpufreq/scmi-cpufreq.c b/drivers/cpufreq/scmi-cpufreq.c index 3745dc5fe2a8..ec0c58ddc1ed 100644 --- a/drivers/cpufreq/scmi-cpufreq.c +++ b/drivers/cpufreq/scmi-cpufreq.c @@ -69,6 +69,22 @@ 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) { @@ -168,6 +184,7 @@ 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: @@ -206,6 +223,7 @@ 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