[PATCH 0/4] Update Energy Model after chip binning adjusted voltages

Lukasz Luba
2024-03-14T14:04:41Z

Hi all,

This is a follow-up patch aiming to add EM modification due to chip binning.
The first RFC and the discussion can be found here [1].

It uses Exynos chip driver code as a 1st user. The EM framework has been
extended to handle this use case easily, when the voltage has been changed
after setup. On my Odroid-xu4 in some OPPs I can observe ~20% power difference.
According to that data in driver tables it could be up to ~29%.

This chip binning is applicable to a lot of SoCs, so the EM framework should
make it easy to update. It uses the existing OPP and DT information to
re-calculate the new power values.

Changes:
v2:
- exported the OPP calculation function from the OPP/OF so it can be
used from EM fwk (Viresh)
- refactored EM updating function to re-use common code
- added new EM function which can be used by chip device drivers which
modify the voltage in OPPs
v1 is at [1]

Regards,
Lukasz Luba

[1] https://lore.kernel.org/lkml/20231220110339.1065505-1-lukasz.luba@arm.com/

Lukasz Luba (4):
OPP: OF: Export dev_opp_pm_calc_power() for usage from EM
PM: EM: Change the em_adjust_new_capacity() to re-use code
PM: EM: Add em_dev_update_chip_binning()
soc: samsung: exynos-asv: Update Energy Model after adjusting voltage

drivers/opp/of.c | 17 +++--
drivers/soc/samsung/exynos-asv.c | 11 +++-
include/linux/energy_model.h | 5 ++
include/linux/pm_opp.h | 8 +++
kernel/power/energy_model.c | 109 +++++++++++++++++++++++++------
5 files changed, 125 insertions(+), 25 deletions(-)

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2.25.1