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From: Viresh Kumar <viresh.kumar@linaro.org>
To: Ulf Hansson <ulf.hansson@linaro.org>
Cc: Rajendra Nayak <rnayak@codeaurora.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Linux PM <linux-pm@vger.kernel.org>,
	DTML <devicetree@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-arm-msm <linux-arm-msm@vger.kernel.org>,
	Stephen Boyd <swboyd@chromium.org>,
	Roja Rani Yarubandi <rojay@codeaurora.org>,
	Stephan Gerhold <stephan@gerhold.net>
Subject: Re: [PATCH v6 1/2] PM / Domains: Add support for 'required-opps' to set default perf state
Date: Wed, 11 Aug 2021 16:49:00 +0530	[thread overview]
Message-ID: <20210811111900.bloukqgc3f2a4f2m@vireshk-i7> (raw)
In-Reply-To: <CAPDyKFp3xmx1r_2SCbrVcT-CcyUkTUoNgiUMWoyuWw5jE6WLrA@mail.gmail.com>

On 11-08-21, 12:52, Ulf Hansson wrote:
> On Wed, 11 Aug 2021 at 12:07, Viresh Kumar <viresh.kumar@linaro.org> wrote:
> >
> > On 11-08-21, 15:30, Rajendra Nayak wrote:
> > > In my case I don't want to error out if the property is missing, I want to error out
> > > only when the property exists but can't be translated into a performance state.
> > >
> > > So currently I check if the property exists and *only then* try to translate it, Ulf asked
> > > me to skip the check. If I do that and I call of_get_required_opp_performance_state()
> > > unconditionally, and if it errors out I will need to put in additional logic (check for
> > > return value of ENODEV) to distinguish between the property-does-not-exist vs
> > > property-exists-but-cannot-be-translated case.
> > > It just seems more straight-forward to call this only when the property exists, Ulf?
> >
> > The same check will be done by OPP core as well, so it is better to
> > optimize for the success case here. I will say, don't error out on
> > ENODEV, rest you know well.
> 
> This should work, while I generally favor not having to parse for
> specific return codes.
> 
> Another option is to add a new OPP OF helperfunction that just informs
> the caller whether the required-opps property exists (instead of
> open-coding that part), and if so, the caller can continue with
> of_get_required_opp_performance_state() and then expect it to succeed.
> 
> I have no strong opinion though! Whatever works for me.

I would like to work with the existing set of APIs, as the OPP core is
going to do that check anyways, again.

-- 
viresh

  reply	other threads:[~2021-08-11 11:19 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-04 10:58 [PATCH v6 0/2] " Rajendra Nayak
2021-08-04 10:58 ` [PATCH v6 1/2] " Rajendra Nayak
2021-08-06  9:32   ` Ulf Hansson
2021-08-09 11:08     ` Rajendra Nayak
2021-08-10  2:43       ` Viresh Kumar
2021-08-11 10:00         ` Rajendra Nayak
2021-08-11 10:07           ` Viresh Kumar
2021-08-11 10:52             ` Ulf Hansson
2021-08-11 11:19               ` Viresh Kumar [this message]
2021-08-09 22:26   ` Dmitry Osipenko
2021-08-09 22:44     ` Dmitry Osipenko
2021-08-09 23:46       ` Dmitry Osipenko
2021-08-10  0:37         ` Dmitry Osipenko
2021-08-11  9:45         ` Rajendra Nayak
2021-08-11 19:48           ` Dmitry Osipenko
2021-08-12  2:28             ` Dmitry Osipenko
2021-08-04 10:58 ` [PATCH v6 2/2] arm64: dts: sc7180: Add required-opps for i2c Rajendra Nayak

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