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 and DT files 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.
* Patches 06-07 provide the dynamic-power-coefficient values for Juno
and TC2.
Thanks,
Quentin
Dietmar Eggemann (3):
cpufreq: arm_big_little: Register an Energy Model
arm64: dts: juno: Add cpu dynamic-power-coefficient information
arm: dts: vexpress-v2p-ca15_a7: Add cpu dynamic-power-coefficient
information
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
arch/arm/boot/dts/vexpress-v2p-ca15_a7.dts | 5 ++
arch/arm64/boot/dts/arm/juno-r2.dts | 6 +++
arch/arm64/boot/dts/arm/juno.dts | 6 +++
drivers/cpufreq/arm_big_little.c | 10 ++++
drivers/cpufreq/cpufreq-dt.c | 7 ++-
drivers/cpufreq/scmi-cpufreq.c | 36 ++++++++++++-
drivers/cpufreq/scpi-cpufreq.c | 8 ++-
drivers/opp/of.c | 60 ++++++++++++++++++++++
include/linux/pm_opp.h | 5 ++
9 files changed, 140 insertions(+), 3 deletions(-)
--
2.20.1
