linux-kernel - Re: [PATCH v3 04/12] opp: Add dev_pm_opp_sync

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Date:   Mon, 18 Jan 2021 16:36:47 +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>,
        Peter Geis <pgwipeout@...il.com>,
        Nicolas Chauvet <kwizart@...il.com>,
        "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>, Nishanth Menon <nm@...com>,
        Yangtao Li <tiny.windzz@...il.com>,
        Matt Merhar <mattmerhar@...tonmail.com>,
        linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH v3 04/12] opp: Add dev_pm_opp_sync_regulators()

On 18-01-21, 16:30, Viresh Kumar wrote:
> On 18-01-21, 03:55, Dmitry Osipenko wrote:
> > Extend OPP API with dev_pm_opp_sync_regulators() function, which syncs
> > voltage state of regulators.
> > 
> > Tested-by: Peter Geis <pgwipeout@...il.com>
> > Tested-by: Nicolas Chauvet <kwizart@...il.com>
> > Tested-by: Matt Merhar <mattmerhar@...tonmail.com>
> > Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> > ---
> >  drivers/opp/core.c     | 45 ++++++++++++++++++++++++++++++++++++++++++
> >  include/linux/pm_opp.h |  6 ++++++
> >  2 files changed, 51 insertions(+)
> > 
> > diff --git a/drivers/opp/core.c b/drivers/opp/core.c
> > index 7b4d07279638..99d18befc209 100644
> > --- a/drivers/opp/core.c
> > +++ b/drivers/opp/core.c
> > @@ -2686,3 +2686,48 @@ void dev_pm_opp_remove_table(struct device *dev)
> >  	dev_pm_opp_put_opp_table(opp_table);
> >  }
> >  EXPORT_SYMBOL_GPL(dev_pm_opp_remove_table);
> > +
> > +/**
> > + * dev_pm_opp_sync_regulators() - Sync state of voltage regulators
> > + * @dev:	device for which we do this operation
> > + *
> > + * Sync voltage state of the OPP table regulators.
> > + *
> > + * Return: 0 on success or a negative error value.
> > + */
> > +int dev_pm_opp_sync_regulators(struct device *dev)
> > +{
> > +	struct opp_table *opp_table;
> > +	struct regulator *reg;
> > +	int i, ret = 0;
> > +
> > +	/* Device may not have OPP table */
> > +	opp_table = _find_opp_table(dev);
> > +	if (IS_ERR(opp_table))
> > +		return 0;
> > +
> > +	/* Regulator may not be required for the device */
> > +	if (!opp_table->regulators)
> > +		goto put_table;
> > +
> > +	mutex_lock(&opp_table->lock);
> > +
> > +	/* Nothing to sync if voltage wasn't changed */
> > +	if (!opp_table->enabled)
> > +		goto unlock;
> > +
> > +	for (i = 0; i < opp_table->regulator_count; i++) {
> > +		reg = opp_table->regulators[i];
> > +		ret = regulator_sync_voltage(reg);
> > +		if (ret)
> > +			break;
> > +	}
> > +unlock:
> > +	mutex_unlock(&opp_table->lock);
> > +put_table:
> > +	/* Drop reference taken by _find_opp_table() */
> > +	dev_pm_opp_put_opp_table(opp_table);
> > +
> > +	return ret;
> > +}
> > +EXPORT_SYMBOL_GPL(dev_pm_opp_sync_regulators);
> > diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
> > index c24bd34339d7..1c3a09cc8dcd 100644
> > --- a/include/linux/pm_opp.h
> > +++ b/include/linux/pm_opp.h
> > @@ -162,6 +162,7 @@ int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, const struct cpumask *cp
> >  int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask);
> >  void dev_pm_opp_remove_table(struct device *dev);
> >  void dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask);
> > +int dev_pm_opp_sync_regulators(struct device *dev);
> >  #else
> >  static inline struct opp_table *dev_pm_opp_get_opp_table(struct device *dev)
> >  {
> > @@ -398,6 +399,11 @@ static inline void dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask
> >  {
> >  }
> >  
> > +static inline int dev_pm_opp_sync_regulators(struct device *dev)
> > +{
> > +	return -ENOTSUPP;
> > +}
> > +
> >  #endif		/* CONFIG_PM_OPP */
> >  
> >  #if defined(CONFIG_PM_OPP) && defined(CONFIG_OF)
> 
> Applied. Thanks.
> 
> I had to apply it manually, please make sure it looks okay.

Sorry about this, I wanted to reply to
"opp: Add devm_pm_opp_register_set_opp_helper" and replied to this one
accidentally.

-- 
viresh