linux-kernel - Re: [PATCH 1/2] dt-bindings: arm: idle-states: Add idle-state-disabled property

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Message-ID: <806f395c-91d7-a410-51ab-93898faba7ce@quicinc.com>
Date:   Wed, 21 Jun 2023 11:57:28 +0530
From:   Tushar Nimkar <quic_tnimkar@...cinc.com>
To:     Sudeep Holla <sudeep.holla@....com>
CC:     "Rafael J . Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        <linux-pm@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <quic_lsrao@...cinc.com>,
        <quic_mkshah@...cinc.com>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH 1/2] dt-bindings: arm: idle-states: Add
 idle-state-disabled property

Thanks again Sudeep,

On 6/16/2023 9:09 PM, Sudeep Holla wrote:
> On Fri, Jun 16, 2023 at 11:26:18AM +0530, Tushar Nimkar wrote:

> 
> OK try command line approach to disable all states(you can't get partial
> on/off in that case). I don't think the build config is of any use as we
> end up enabling it which will affect other platforms.
> 
Do you mean cpuidle.off=1 ?
It will disable idle states but this will not allow cpuidle_init() and 
governors register to happen which mean no way to re-enable idle states.
Do you mean any other command line approach?

> 
> The above still holds, so still NACK. It is a policy and not a
> hardware/firmware property or feature.
> 
Yes, understood!

Thanks,
Tushar