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 v3 (20190201093101.31869-1-quentin.per...@arm.com) - Moved the OPP count inside dev_pm_opp_of_register_em() (Matthias, Sudeep) Changes since v2 (20190130170506.20450-1-quentin.per...@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.per...@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 | 2 + drivers/cpufreq/cpufreq-dt.c | 2 + drivers/cpufreq/scmi-cpufreq.c | 39 ++++++++++++- drivers/cpufreq/scpi-cpufreq.c | 3 + drivers/opp/of.c | 99 ++++++++++++++++++++++++++++++++ include/linux/pm_opp.h | 6 ++ 6 files changed, 148 insertions(+), 3 deletions(-) -- 2.20.1
