From: Pavel Machek <pavel@ucw.cz>
To: Thara Gopinath <thara.gopinath@linaro.org>
Cc: rui.zhang@intel.com, ulf.hansson@linaro.org,
daniel.lezcano@linaro.org, bjorn.andersson@linaro.org,
agross@kernel.org, robh@kernel.org, amit.kucheria@verdurent.com,
mark.rutland@arm.com, rjw@rjwysocki.net,
linux-pm@vger.kernel.org, devicetree@vger.kernel.org,
linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v6 0/6] Introduce Power domain based warming device driver
Date: Wed, 17 Jun 2020 23:14:36 +0200 [thread overview]
Message-ID: <20200617211436.GA2078@bug> (raw)
In-Reply-To: <0eb2e140-9c9c-4777-9916-d81eddc793ca@linaro.org>
Hi!
> >>falls below certain threshold. These power domains can be considered as
> >>thermal warming devices. (opposite of thermal cooling devices).
> >
> >Would you explain when this is needed?
> >
> >I'd normally expect "too low" temperature to be a problem during power-on, but at
> >that time Linux is not running so it can not provide the heating...
> Hi Pavel,
>
> This is more in the scenario if the system in on and temperature is dipping
> (I have been told in colder climates). Idea is to turn on resources so as to
> prevent further dipping of temperature if possible.
I guess even that makes sense...
But, out of curiosity, do you know which kind of device is that and in what
kind of environment? I mean, theoretically it may make sense on a cellphone,
but... I guess you have some fun device and would like to know what it is :-).
Hmm. And we can make this quite generic.
while (too_cold())
barrier();
Wasting power is really easy :-).
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
prev parent reply other threads:[~2020-06-17 21:15 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-04 1:53 [PATCH v6 0/6] Introduce Power domain based warming device driver Thara Gopinath
2020-06-04 1:53 ` [PATCH v6 1/6] PM/Domains: Add support for retrieving genpd performance states information Thara Gopinath
2020-06-04 1:53 ` [PATCH v6 2/6] soc: qcom: rpmhpd: Introduce function to retrieve power domain performance state count Thara Gopinath
2020-06-16 9:21 ` Ulf Hansson
2020-06-16 17:19 ` Thara Gopinath
2020-06-04 1:53 ` [PATCH v6 3/6] thermal: Add generic power domain warming device driver Thara Gopinath
2020-06-16 9:21 ` Ulf Hansson
2020-07-03 10:02 ` Daniel Lezcano
2020-07-07 10:58 ` Lukasz Luba
2020-06-04 1:53 ` [PATCH v6 4/6] soc: qcom: Extend RPMh power controller driver to register warming devices Thara Gopinath
2020-06-16 9:21 ` Ulf Hansson
2020-06-04 1:53 ` [PATCH v6 5/6] dt-bindings: power: Extend RPMh power controller binding to describe thermal warming device Thara Gopinath
2020-06-16 9:21 ` Ulf Hansson
2020-06-04 1:53 ` [PATCH v6 6/6] arm64: dts: qcom: Indicate rpmhpd hosts a power domain that can be used as a " Thara Gopinath
2020-06-16 10:53 ` [PATCH v6 0/6] Introduce Power domain based warming device driver Pavel Machek
2020-06-16 17:24 ` Thara Gopinath
2020-06-17 21:14 ` Pavel Machek [this message]
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