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From: Viresh Kumar <viresh.kumar@linaro.org>
To: Ulf Hansson <ulf.hansson@linaro.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>,
	Stephan Gerhold <stephan@gerhold.net>,
	Loic Poulain <loic.poulain@linaro.org>,
	Andy Gross <agross@kernel.org>,
	linux-arm-msm <linux-arm-msm@vger.kernel.org>,
	Lina Iyer <ilina@codeaurora.org>
Subject: Re: [PATCH] arch: arm64: dts: apq8016-dbc: Add missing cpu opps
Date: Mon, 11 May 2020 10:59:01 +0530	[thread overview]
Message-ID: <20200511052901.tfjpjawhca7w3tun@vireshk-i7> (raw)
In-Reply-To: <CAPDyKFohjoY0rsTwVGQY_csDRfvxF0RiU+d12EpC+mk6BC95gA@mail.gmail.com>

On 08-05-20, 14:08, Ulf Hansson wrote:
> + Lina
> 
> On Thu, 7 May 2020 at 07:33, Bjorn Andersson <bjorn.andersson@linaro.org> wrote:
> >
> > On Wed 06 May 14:18 PDT 2020, Stephan Gerhold wrote:
> >
> > Viresh, Ulf,
> >
> > Stephan is trying to describe the relationship between the CPU rail and
> > the memory rail on db410c (where the performance state of the memory
> > rail needs to be kept above the performance state of the CPU supply.
> >
> > The latter is modelled as a power-domain and the performance state
> > changes as expected, but no one enables the power-domain.
> 
> Just to make one thing clear, from a genpd framework point of view,
> power on/off of a genpd is orthogonal to setting/aggregating
> performance states for it.
> 
> It's instead up to the genpd provider to deal with this (as I
> understand, that seems to be the issue from the below discussions).
> 
> >
> > What's the appropriate method for ensuring the power-domain is
> > enabled/disabled as needed? Should it be referenced in the hierarchical
> > power domain for the CPUs perhaps?
> 
> If I understand the dependency correctly, perhaps you are right that
> there needs to be a subdomain assigned. Although, I don't know if this
> ever has been tested to work for a real use case, when it comes to
> performance state propagations upwards in the hierarchy.
> 
> Viresh?

I have modeled that with a fake system, and yes it was tested. But not on real
hardware but it should work nevertheless.

-- 
viresh

  parent reply	other threads:[~2020-05-11  5:29 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-01 17:50 [PATCH] arch: arm64: dts: apq8016-dbc: Add missing cpu opps Loic Poulain
2020-04-01 23:46 ` Bjorn Andersson
2020-04-02  8:13 ` Stephan Gerhold
2020-04-02  9:58   ` Loic Poulain
2020-04-03  1:31   ` Bjorn Andersson
2020-04-03 10:09     ` Stephan Gerhold
2020-04-03 18:00       ` Stephan Gerhold
2020-04-23  4:55         ` Bjorn Andersson
2020-04-26 12:31           ` Stephan Gerhold
2020-05-06 21:18             ` Stephan Gerhold
2020-05-07  5:34               ` Bjorn Andersson
2020-05-08 12:08                 ` Ulf Hansson
2020-05-08 13:42                   ` Stephan Gerhold
2020-05-11  5:29                   ` Viresh Kumar [this message]
2020-05-07 10:46               ` Stephan Gerhold
2020-05-21 19:18                 ` Stephan Gerhold
2020-05-23 12:08                   ` Stephan Gerhold
2020-05-27 20:47                     ` Georgi Djakov
2020-05-25 15:32           ` Niklas Cassel
2020-05-25 16:36             ` Stephan Gerhold
2020-05-25 19:44               ` Niklas Cassel
2020-05-26  8:59                 ` Stephan Gerhold
2020-05-26 15:54                   ` Niklas Cassel
2020-05-26 20:54                     ` Stephan Gerhold
2020-05-27 10:39                       ` Niklas Cassel
2020-05-27 12:04                         ` Stephan Gerhold
2020-05-27 12:59                           ` Niklas Cassel
2020-05-27 20:56                             ` Stephan Gerhold
2020-05-27 23:10                               ` Niklas Cassel
2020-05-28 13:32                                 ` Stephan Gerhold
2020-05-28  4:44                           ` Viresh Kumar
2020-04-28 20:04 ` Amit Kucheria

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