linux-kernel - Re: [PATCH 21/31] soc/tegra: Remove the call to devm_pm_opp_set

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Date:   Fri, 27 May 2022 08:22:41 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Dmitry Osipenko <dmitry.osipenko@...labora.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Rafael Wysocki <rjw@...ysocki.net>,
        Stephen Boyd <sboyd@...nel.org>, Nishanth Menon <nm@...com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Dmitry Osipenko <digetx@...il.com>,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 21/31] soc/tegra: Remove the call to
 devm_pm_opp_set_clkname()

On 26-05-22, 20:57, Dmitry Osipenko wrote:
> On 5/26/22 14:42, Viresh Kumar wrote:
> > The OPP core already performs devm_pm_opp_set_clkname() with name as
> > NULL, the callers shouldn't be doing the same unless they have a
> > different clock name to add here.

This is confusing. Updated this as:

    The OPP core already performs clk_get(dev, NULL) by default for everyone
    and the callers shouldn't try to set clkname unless they have an actual
    clock name to add here.


> > 
> > Drop the call.
> > 
> > Cc: Dmitry Osipenko <digetx@...il.com>
> > Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> > ---
> >  drivers/soc/tegra/common.c | 6 ------
> >  1 file changed, 6 deletions(-)
> > 
> > diff --git a/drivers/soc/tegra/common.c b/drivers/soc/tegra/common.c
> > index 32c346b72635..49a5360f4507 100644
> > --- a/drivers/soc/tegra/common.c
> > +++ b/drivers/soc/tegra/common.c
> > @@ -108,12 +108,6 @@ int devm_tegra_core_dev_init_opp_table(struct device *dev,
> >  	u32 hw_version;
> >  	int err;
> >  
> > -	err = devm_pm_opp_set_clkname(dev, NULL);
> > -	if (err) {
> > -		dev_err(dev, "failed to set OPP clk: %d\n", err);
> > -		return err;
> > -	}
> > -
> >  	/* Tegra114+ doesn't support OPP yet */
> >  	if (!of_machine_is_compatible("nvidia,tegra20") &&
> >  	    !of_machine_is_compatible("nvidia,tegra30"))
> 
> I can't see where OPP core performs devm_pm_opp_set_clkname().

Sorry about that, it is clk_get() it performs from
_update_opp_table_clk().

I don't think you need to call devm_pm_opp_set_clkname() here, but
lets see if this breaks anything for you.

-- 
viresh