[PATCH V3 0/9] Add callback to register with energy model

Viresh Kumar
2021-08-12T04:39:00Z

Many cpufreq drivers register with the energy model for each policy and
do exactly the same thing. Follow the footsteps of thermal-cooling, to
get it done from the cpufreq core itself.

Provide a new callback, which will be called, if present, by the cpufreq
core at the right moment (more on that in the code's comment). Also
provide a generic implementation that uses dev_pm_opp_of_register_em().

This also allows us to register with the EM at a later point of time,
compared to ->init(), from where the EM core can access cpufreq policy
directly using cpufreq_cpu_get() type of helpers and perform other work,
like marking few frequencies inefficient, this will be done separately.

This is build/boot tested by the bot for a couple of boards.

https://gitlab.com/vireshk/pmko/-/pipelines/351965580

FWIW, I have queued up the series for linux-next to get more testing, but your
reviews are welcome. Thanks.

V2->V3:
- Drop the auto-register part from all logs, this isn't called auto registration
anymore.
- Call register_em() only for new policies.
- Update scmi driver to register with EM only when required.
- Add Rby tags.

V1->V2:
- Add a callback instead of flag.
- Register before governor is initialized.
- Update scmi driver as well.
- Don't unregister from the EM core.

--
Viresh

Viresh Kumar (9):
cpufreq: Add callback to register with energy model
cpufreq: dt: Use .register_em() to register with energy model
cpufreq: imx6q: Use .register_em() to register with energy model
cpufreq: mediatek: Use .register_em() to register with energy model
cpufreq: omap: Use .register_em() to register with energy model
cpufreq: qcom-cpufreq-hw: Use .register_em() to register with energy
model
cpufreq: scpi: Use .register_em() to register with energy model
cpufreq: vexpress: Use .register_em() to register with energy model
cpufreq: scmi: Use .register_em() to register with energy model

drivers/cpufreq/cpufreq-dt.c | 3 +-
drivers/cpufreq/cpufreq.c | 13 ++++++
drivers/cpufreq/imx6q-cpufreq.c | 2 +-
drivers/cpufreq/mediatek-cpufreq.c | 3 +-
drivers/cpufreq/omap-cpufreq.c | 2 +-
drivers/cpufreq/qcom-cpufreq-hw.c | 3 +-
drivers/cpufreq/scmi-cpufreq.c | 65 +++++++++++++++++---------
drivers/cpufreq/scpi-cpufreq.c | 3 +-
drivers/cpufreq/vexpress-spc-cpufreq.c | 3 +-
include/linux/cpufreq.h | 14 ++++++
10 files changed, 76 insertions(+), 35 deletions(-)