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From: Viresh Kumar <viresh.kumar@linaro.org>
To: Lukasz Luba <lukasz.luba@arm.com>, vincent.guittot@linaro.org
Cc: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
	devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	vireshk@kernel.org, robh+dt@kernel.org, sboyd@kernel.org,
	nm@ti.com, rafael@kernel.org, sudeep.holla@arm.com,
	daniel.lezcano@linaro.org, Dietmar.Eggemann@arm.com
Subject: Re: [PATCH 0/4] Add sustainable OPP concept
Date: Thu, 29 Oct 2020 13:23:56 +0530	[thread overview]
Message-ID: <20201029075356.rruej6jlerhfa4oy@vireshk-i7> (raw)
In-Reply-To: <20201029074057.6ugmwyzna52x3oli@vireshk-i7>

On 29-10-20, 13:10, Viresh Kumar wrote:
> On 28-10-20, 14:08, Lukasz Luba wrote:
> > Hi all,
> > 
> > This patch set introduces a concept of sustainable OPP, which then can be used
> > by kernel frameworks or governors for estimating system sustainable system
> > state. This kind of estimation is done e.g. in thermal governor Intelligent
> > Power Allocation (IPA), which calculates sustainable power of the whole system
> > and then derives some coefficients for internal algorithm.
> > 
> > The patch set introduces a new DT bindings 'opp-sustainable', with parsing
> > code. It also adds a function (in patch 3/4) which allows device drivers to set
> > directly the sustainable OPP. This is helpful when the device drivers populate
> > the OPP table by themself (example in patch 4/4).
> > 
> 
> Can we please have some more information about this ? What does the
> sustainable OPP mean ? How will platform guys know or learn about this
> ? How we are going to use it finally ? What does it have to do with
> temperature of the SoC or the thermal affects, etc.

And that we need a real user of this first if it is ever going to be
merged.

-- 
viresh

  reply	other threads:[~2020-10-29  7:56 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-28 14:08 [PATCH 0/4] Add sustainable OPP concept Lukasz Luba
2020-10-28 14:08 ` [PATCH 1/4] dt-bindings: opp: Introduce opp-sustainable bindings Lukasz Luba
2020-10-28 21:47   ` Nishanth Menon
2020-10-29 10:04     ` Lukasz Luba
2020-10-29 12:59       ` Nishanth Menon
2020-10-29 13:33         ` Lukasz Luba
2020-10-29 13:49           ` Nishanth Menon
2020-10-29 14:20             ` Lukasz Luba
2020-10-30 19:34   ` Rob Herring
2020-11-02  8:40     ` Lukasz Luba
2020-10-28 14:08 ` [PATCH 2/4] OPP: Add support for parsing the 'opp-sustainable' property Lukasz Luba
2020-10-30 11:47   ` Quentin Perret
2020-10-30 12:53     ` Lukasz Luba
2020-10-28 14:08 ` [PATCH 3/4] OPP: Add dev_pm_opp_set_sustainable_opp_freq() Lukasz Luba
2020-10-28 14:08 ` [PATCH 4/4] firmware: arm_scmi/perf: Mark sustainable OPP Lukasz Luba
2020-10-29  7:40 ` [PATCH 0/4] Add sustainable OPP concept Viresh Kumar
2020-10-29  7:53   ` Viresh Kumar [this message]
2020-10-29  9:56     ` Lukasz Luba
2020-10-30  8:29       ` Viresh Kumar
2020-10-30  9:19         ` Lukasz Luba
2020-10-30  9:52           ` Viresh Kumar
2020-10-30 10:56             ` Lukasz Luba
2020-10-30 11:17               ` Viresh Kumar
2020-10-30 12:40                 ` Lukasz Luba

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