linux-kernel - [PATCH 0/4] PM / devfreq: Add cpu based scaling support to passive governor

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Date:   Thu, 17 Jun 2021 15:05:42 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     andrew-sh.cheng@...iatek.com, hsinyi@...omium.org
Cc:     sibis@...eaurora.org, saravanak@...gle.com,
        myungjoo.ham@...sung.com, kyungmin.park@...sung.com,
        cw00.choi@...sung.com, chanwoo@...nel.org, cwchoi00@...il.com,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 0/4] PM / devfreq: Add cpu based scaling support to passive
 governor

The devfreq passive governor has already supported the devfreq parent device
for coupling the frequency change if some hardware have the constraints
such as power sharing and so on.

Add cpu based scaling support to passive governor with required-opp property.
It uses the cpufreq notifier to catch the frequency change timing of cpufreq
and get the next frequency according to new cpu frequency by using required-opp
property. It is based on patch[1] and then just code clean-up by myself.

Make the common code for both passive_devfreq and passive_cpufreq
parent type to remove the duplicate code.

The patch[2] is required for this patchset to use required-opp property.

[1] [RFC,v2] PM / devfreq: Add cpu based scaling support to passive_governor
- https://lore.kernel.org/patchwork/patch/1101049/
[2] opp: Allow required-opps to be used for non genpd use cases
- https://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm.git/commit/?h=opp/linux-next&id=5736929761d187499bdf8e2019090e3ed43d3d7b

Dear Andrew-sh.Cheng and Hsin-Yi Wang,
Please test your patches based on this patchset and then reply the test result
with your Tested-by tag or reviewed-by tag. Thanks for your work.

Chanwoo Choi (3):
  PM / devfreq: passive: Fix get_target_freq when not using required-opp
  PM / devfreq: Export devfreq_get_freq_ragne symbol within devfreq
  PM / devfreq: passive: Reduce duplicate code when passive_devfreq case

Saravana Kannan (1):
  PM / devfreq: Add cpu based scaling support to passive governor

 drivers/devfreq/devfreq.c          |  17 +-
 drivers/devfreq/governor.h         |  24 +++
 drivers/devfreq/governor_passive.c | 325 +++++++++++++++++++++++------
 include/linux/devfreq.h            |  16 +-
 4 files changed, 310 insertions(+), 72 deletions(-)

-- 
2.17.1