From mboxrd@z Thu Jan 1 00:00:00 1970 From: Quentin Perret Subject: [PATCH v3 0/5] Register an Energy Model for Arm reference platforms Date: Fri, 1 Feb 2019 09:30:56 +0000 Message-ID: <20190201093101.31869-1-quentin.perret@arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Return-path: 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 The Energy Model (EM) framework feeds interested subsystems (the scheduler/EAS as of now) with power costs provided by drivers. Yet, no driver is actually doing that upstream yet. This series updates a set of CPUFreq drivers in order to register power costs in the EM framework for some of the Arm reference platforms for EAS: Hikey960, Juno and TC2. The series is split as follows: - Patch 01 introduces in PM_OPP a helper function which estimates the CPU power using the P=CV²f equation also used by IPA. It should be noted that this introduces duplicate code with IPA, which will eventually be fixed by migrating IPA to using PM_EM. The ideal plan would be to do so later, in a separate patch series. I would indeed prefer to keep the thermal and CPUFreq discussion separate at this stage, if deemed acceptable. - Patches 02-04 make use of that PM_OPP helper function from the following CPUFreq drivers: cpufreq-dt, scpi-cpufreq and arm_big_little. - Patch 05 modifies the SCMI cpufreq driver to pass the power costs obtained from firmware to PM_EM. This patch is independent from the rest of the series. Changes since v2 (20190130170506.20450-1-quentin.perret@arm.com) - Added comment to explain why we check only the dynamic-power-coeff property and not voltages in dev_pm_opp_of_register_em() (Viresh) - Fixed comments/docstrings of new functions in opp/of.c (Matthias) - Added Matthias' Tested-by to patch 01 Changes since v1 (20190128165522.31749-1-quentin.perret@arm.com): - Dropped the DT patches that have been queued by Sudeep - Introduced dev_pm_opp_of_register_em() helper to check the presence of the DT coeff before calling PM_EM (Viresh, Matthias) - Coding-style improvements (Viresh, Matthias) Thanks, Quentin Dietmar Eggemann (1): cpufreq: arm_big_little: Register an Energy Model Quentin Perret (4): PM / OPP: Introduce a power estimation helper cpufreq: dt: Register an Energy Model cpufreq: scpi: Register an Energy Model cpufreq: scmi: Register an Energy Model drivers/cpufreq/arm_big_little.c | 8 +++ drivers/cpufreq/cpufreq-dt.c | 8 ++- drivers/cpufreq/scmi-cpufreq.c | 39 ++++++++++++- drivers/cpufreq/scpi-cpufreq.c | 9 ++- drivers/opp/of.c | 96 ++++++++++++++++++++++++++++++++ include/linux/pm_opp.h | 6 ++ 6 files changed, 157 insertions(+), 9 deletions(-) -- 2.20.1