linux-kernel - Re: [PATCH v2 11/48] opp: Add dev_pm_opp_find_level

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Message-ID: <20201224064339.zngidobhstnlu2a3@vireshk-i7>
Date:   Thu, 24 Dec 2020 12:13:39 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Peter Geis <pgwipeout@...il.com>,
        Nicolas Chauvet <kwizart@...il.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Kevin Hilman <khilman@...nel.org>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Viresh Kumar <vireshk@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-media@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-clk@...r.kernel.org
Subject: Re: [PATCH v2 11/48] opp: Add dev_pm_opp_find_level_ceil()

On 23-12-20, 23:37, Dmitry Osipenko wrote:
> 23.12.2020 07:19, Viresh Kumar пишет:
> > On 22-12-20, 22:15, Dmitry Osipenko wrote:
> >> 22.12.2020 09:42, Viresh Kumar пишет:
> >>> On 17-12-20, 21:06, Dmitry Osipenko wrote:
> >>>> Add a ceil version of the dev_pm_opp_find_level(). It's handy to have if
> >>>> levels don't start from 0 in OPP table and zero usually means a minimal
> >>>> level.
> >>>>
> >>>> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> >>>
> >>> Why doesn't the exact version work for you here ?
> >>>
> >>
> >> The exact version won't find OPP for level=0 if levels don't start with
> >> 0, where 0 means that minimal level is desired.
> > 
> > Right, but why do you need to send 0 for your platform ?
> > 
> 
> To put power domain into the lowest performance state when device is idling.

I see. So you really want to set it to the lowest state or just take the vote
out ? Which may end up powering off the domain in the worst case ?

-- 
viresh