From mboxrd@z Thu Jan 1 00:00:00 1970 From: Quentin Perret Subject: [PATCH v3 4/5] cpufreq: arm_big_little: Register an Energy Model Date: Fri, 1 Feb 2019 09:31:00 +0000 Message-ID: <20190201093101.31869-5-quentin.perret@arm.com> References: <20190201093101.31869-1-quentin.perret@arm.com> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Return-path: In-Reply-To: <20190201093101.31869-1-quentin.perret@arm.com> Sender: linux-kernel-owner@vger.kernel.org To: viresh.kumar@linaro.org, sudeep.holla@arm.com, rjw@rjwysocki.net, nm@ti.com, sboyd@kernel.org, mka@chromium.org Cc: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, dietmar.eggemann@arm.com, quentin.perret@arm.com List-Id: linux-pm@vger.kernel.org From: Dietmar Eggemann Now that PM_OPP provides a helper function to estimate the power consumed by CPUs, make sure to try and register an Energy Model (EM) from the arm_big_little CPUFreq driver, hence ensuring interested subsystems (the task scheduler, for example) can make use of that information when available. Signed-off-by: Dietmar Eggemann Signed-off-by: Quentin Perret --- drivers/cpufreq/arm_big_little.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/cpufreq/arm_big_little.c b/drivers/cpufreq/arm_big_little.c index cf62a1f64dd7..18b05bcb2614 100644 --- a/drivers/cpufreq/arm_big_little.c +++ b/drivers/cpufreq/arm_big_little.c @@ -487,6 +487,14 @@ static int bL_cpufreq_init(struct cpufreq_policy *policy) policy->cpuinfo.transition_latency = arm_bL_ops->get_transition_latency(cpu_dev); + ret = dev_pm_opp_get_opp_count(cpu_dev); + if (ret <= 0) { + dev_dbg(cpu_dev, "OPP table is not ready, deferring probe\n"); + return -EPROBE_DEFER; + } + + dev_pm_opp_of_register_em(policy->cpus, ret); + if (is_bL_switching_enabled()) per_cpu(cpu_last_req_freq, policy->cpu) = clk_get_cpu_rate(policy->cpu); -- 2.20.1