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From: Hsin-Yi Wang <hsinyi@chromium.org>
To: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Viresh Kumar <vireshk@kernel.org>,
	Linux PM <linux-pm@vger.kernel.org>, Nishanth Menon <nm@ti.com>,
	Stephen Boyd <sboyd@kernel.org>,
	"Rafael J . Wysocki" <rjw@rjwysocki.net>,
	lkml <linux-kernel@vger.kernel.org>,
	"MyungJoo Ham )" <myungjoo.ham@samsung.com>,
	Kyungmin Park <kyungmin.park@samsung.com>,
	Chanwoo Choi <cw00.choi@samsung.com>,
	Saravana Kannan <saravanak@google.com>
Subject: Re: [PATCH v5 0/3] Add required-opps support to devfreq passive gov
Date: Thu, 4 Feb 2021 16:12:01 +0800	[thread overview]
Message-ID: <CAJMQK-jaYTG_jRB1mfs8c1=NWM2bEAWhUUhjVTfGJ5fCR6dCkQ@mail.gmail.com> (raw)
In-Reply-To: <20210204054133.sb6vymf56u43bpwe@vireshk-i7>

On Thu, Feb 4, 2021 at 1:41 PM Viresh Kumar <viresh.kumar@linaro.org> wrote:
>
> On 03-02-21, 17:23, Hsin-Yi Wang wrote:
> > The devfreq passive governor scales the frequency of a "child" device based
> > on the current frequency of a "parent" device (not parent/child in the
> > sense of device hierarchy). As of today, the passive governor requires one
> > of the following to work correctly:
> > 1. The parent and child device have the same number of frequencies
> > 2. The child device driver passes a mapping function to translate from
> >    parent frequency to child frequency.
> >
> > When (1) is not true, (2) is the only option right now. But often times,
> > all that is required is a simple mapping from parent's frequency to child's
> > frequency.
> >
> > Since OPPs already support pointing to other "required-opps", add support
> > for using that to map from parent device frequency to child device
> > frequency. That way, every child device driver doesn't have to implement a
> > separate mapping function anytime (1) isn't true.
>
> So you guys aren't interested in dev_pm_opp_set_opp() but just the
> translation of the required-OPPs ?
>
I think this series focuses on required-opps.

> I am fine with most of the stuff and I would like to take it via OPP
> tree, hope that would be fine ?
>
Sounds good to me, thanks.

> --
> viresh

  reply	other threads:[~2021-02-04  8:13 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20210203092602epcas1p1550c96a2ed1b0b6d0a0f9f750cb76e45@epcas1p1.samsung.com>
2021-02-03  9:23 ` Hsin-Yi Wang
2021-02-03  9:23   ` [PATCH v5 1/3] OPP: Add function to look up required OPP's for a given OPP Hsin-Yi Wang
2021-02-04  5:46     ` Viresh Kumar
2021-02-03  9:23   ` [PATCH v5 2/3] PM / devfreq: Cache OPP table reference in devfreq Hsin-Yi Wang
2021-02-03  9:24   ` [PATCH v5 3/3] PM / devfreq: Add required OPPs support to passive governor Hsin-Yi Wang
2021-02-04  2:49     ` Viresh Kumar
2021-02-04  7:07       ` Hsin-Yi Wang
2021-02-03 10:12   ` [PATCH v5 0/3] Add required-opps support to devfreq passive gov Chanwoo Choi
2021-02-04  5:41   ` Viresh Kumar
2021-02-04  8:12     ` Hsin-Yi Wang [this message]
2021-02-04  8:53     ` Chanwoo Choi

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