[PATCH v3 0/4] Update Energy Model after chip binning adjusted voltages

From: Lukasz Luba <lukasz.luba@arm.com>
To: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
	rafael@kernel.org
Cc: lukasz.luba@arm.com, dietmar.eggemann@arm.com,
	linux-arm-kernel@lists.infradead.org, sboyd@kernel.org,
	nm@ti.com, linux-samsung-soc@vger.kernel.org,
	daniel.lezcano@linaro.org, viresh.kumar@linaro.org,
	krzysztof.kozlowski@linaro.org, alim.akhtar@samsung.com,
	m.szyprowski@samsung.com, mhiramat@kernel.org
Subject: [PATCH v3 0/4] Update Energy Model after chip binning adjusted voltages
Date: Thu, 28 Mar 2024 08:51:08 +0000	[thread overview]
Message-ID: <20240328085112.3873050-1-lukasz.luba@arm.com> (raw)

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.

It has dependency on Exynos SoC driver.

Changes:
v3:
- updated header description patch 2/4 (Dietmar)
- removed 2 sentences from comment and adjusted in patch 3/4 (Dietmar)
- patch 4/4 re-phrased code comment (Dietmar)
- collected tags (Krzysztof, Viresh)
v2:
- removed 'ret' from error message which wasn't initialized (Christian)
v1:
- 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
RFC is at [1]

Regards,
Lukasz Luba

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      | 106 +++++++++++++++++++++++++------
 5 files changed, 122 insertions(+), 25 deletions(-)

-- 
2.25.1