From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x225tarjVoTwwDvm7XGiOgpR4Zo22eczcW0N2/l62r5vzTpNv9sAdL34e9aaF0TVJMBPHo3IU ARC-Seal: i=1; a=rsa-sha256; t=1518461175; cv=none; d=google.com; s=arc-20160816; b=wwfSxs/UA7OPU70CCjNH3X+g+TBqAybdBAODPbz0JizQcNrtbfKsQQAeDPMvNZDvHf uitA7lA8j1u+OP24l0ox97QUOQUgWsgwl+Tv98SZutgMXvohR48veETfAIxLuyxCt60X W8ZzsAb64AuWTQfhg+8Psx+K/R5F/tWOWyt5DUa7ykb1q+zZMalQkMhup49SeNkmSCmr JBdZtJLmFwRz+KvdpItWJbmG0S8Wnj2cMV743H2R2J132nzThQ9QnrLRrt6GMVJDLNfc S8GVTINkIBBc79CXdnvt6w8aQgJvEylog6nhQawBg44pxl3izZft8FKstLEvOeK5WtId voYA== 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=PjOe8S8Onvct3BSagmr9w+aYI5UY8YfLSSSDIIsw9bc=; b=Hle+KBbwJYDpeN9/WFSpE70Jk6GI/ZsJx3OGwTOOSoogZJFz+PpvoGeAyOZhtHhoAf a/BocBD0Ty6mjX7CyQOTf3k2Kq5bQAD550r2Qapxomdq4cqrYwik9O2IkW1bZM+69CmI 3ieMpz7VJl794WM7lSsSnwiqMZwgKqr3tStTtLaJqeexDkwCdTsutiaKFUBVXdrj7cbN RKAT3572G+svdjYeK+2QHs4CTIu9++8jkv9Z9w/fzjK+DCRtNl7tAkOOly/NxbwpByaI e/aLlRdWO9IlJwXAZv64QQ7x2vAAdm+GWDT4kzoyihYY2Nup+BH6lK/i57NHnpslQrUG Zu5g== 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 , Greg Kroah-Hartman , Arnd Bergmann , Alexey Klimov , linux-pm@vger.kernel.org Subject: [PATCH v5 20/20] cpufreq: scmi: add support for fast frequency switching Date: Mon, 12 Feb 2018 18:45:24 +0000 Message-Id: <1518461124-17371-21-git-send-email-sudeep.holla@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1518461124-17371-1-git-send-email-sudeep.holla@arm.com> References: <1518461124-17371-1-git-send-email-sudeep.holla@arm.com> X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1592221946058023869?= X-GMAIL-MSGID: =?utf-8?q?1592221946058023869?= 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 | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/drivers/cpufreq/scmi-cpufreq.c b/drivers/cpufreq/scmi-cpufreq.c index d6d35f7692b3..c869c99b2142 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: @@ -201,6 +215,7 @@ 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