linux-kernel - [PATCH 0/2] Add provision to keep idle state disabled

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Message-ID: <20230608085544.16211-1-quic_tnimkar@quicinc.com>
Date:   Thu, 8 Jun 2023 14:25:41 +0530
From:   Tushar Nimkar <quic_tnimkar@...cinc.com>
To:     "Rafael J . Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Ulf Hansson <ulf.hansson@...aro.org>
CC:     <linux-pm@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <quic_lsrao@...cinc.com>,
        <quic_mkshah@...cinc.com>, Tushar Nimkar <quic_tnimkar@...cinc.com>
Subject: [PATCH 0/2] Add provision to keep idle state disabled

CPUidle already has CPUIDLE_FLAG_OFF to keep idle state disabled,
Lets extend the support to set this flag using device tree.

This allows to keep an idle state disabled and they can be enabled back using
sysfs after certain point using below command.

echo N > /sys/devices/system/cpu/cpuX/cpuidle/stateX/disable 

This helps in cases where vendors want to keep cpuidle off until home
screen comes up. In the past attempt was done at [1] but it was not considered
safe option to export cpu_idle_poll_ctrl().

[1] https://patchwork.kernel.org/project/linux-arm-msm/patch/1637831676-32737-1-git-send-email-quic_mkshah@quicinc.com/

Thanks,
Tushar Nimkar.

Tushar Nimkar (2):
  dt-bindings: cpu: idle-states: Add idle-state-disabled property
  cpuidle: dt: Add support to keep idle state disabled

 Documentation/devicetree/bindings/cpu/idle-states.yaml | 8 ++++++++
 drivers/cpuidle/dt_idle_states.c                       | 3 +++
 2 files changed, 11 insertions(+)

-- 
2.17.1