linux-kernel - Re: [PATCH] opp: Prepare for ->set_opp() helper to work without regulators

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Date:   Thu, 21 Jan 2021 16:58:45 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Dmitry Osipenko <digetx@...il.com>,
        Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Rafael Wysocki <rjw@...ysocki.net>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] opp: Prepare for ->set_opp() helper to work without
 regulators

On 20-01-21, 13:38, Viresh Kumar wrote:
> On 19-01-21, 12:05, Viresh Kumar wrote:
> > Until now the ->set_opp() helper (i.e. special implementation for
> > setting the OPPs for platforms) was implemented only to take care of
> > multiple regulators case, but going forward we would need that for other
> > use cases as well.
> > 
> > This patch prepares for that by allocating the regulator specific part
> > from dev_pm_opp_set_regulators() and the opp helper part from
> > dev_pm_opp_register_set_opp_helper().
> > 
> > Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> > ---
> > Dmitry,
> > 
> > I haven't tested this patch, can you please help with that ?
> > 
> >  drivers/opp/core.c | 81 ++++++++++++++++++++++++----------------------
> >  drivers/opp/opp.h  |  2 ++
> >  2 files changed, 45 insertions(+), 38 deletions(-)
> 
> Pushed with this diff.
> 
> diff --git a/drivers/opp/core.c b/drivers/opp/core.c
> index 1ed673334565..1dc5ca3f6d26 100644
> --- a/drivers/opp/core.c
> +++ b/drivers/opp/core.c
> @@ -1939,7 +1939,6 @@ struct opp_table *dev_pm_opp_set_regulators(struct device *dev,
>                                             unsigned int count)
>  {
>         struct dev_pm_opp_supply *supplies;
> -       struct dev_pm_set_opp_data *data;
>         struct opp_table *opp_table;
>         struct regulator *reg;
>         int ret, i;
> @@ -1990,9 +1989,8 @@ struct opp_table *dev_pm_opp_set_regulators(struct device *dev,
>         mutex_lock(&opp_table->lock);
>         opp_table->sod_supplies = supplies;
>         if (opp_table->set_opp_data) {
> -               data = opp_table->set_opp_data;
> -               data->old_opp.supplies = supplies;
> -               data->new_opp.supplies = supplies + count;
> +               opp_table->set_opp_data->old_opp.supplies = supplies;
> +               opp_table->set_opp_data->new_opp.supplies = supplies + count;
>         }
>         mutex_unlock(&opp_table->lock);
>  
> @@ -2038,7 +2036,7 @@ void dev_pm_opp_put_regulators(struct opp_table *opp_table)
>                 regulator_put(opp_table->regulators[i]);
>  
>         mutex_lock(&opp_table->lock);
> -       if (opp_table->sod_supplies) {
> +       if (opp_table->set_opp_data) {
>                 opp_table->set_opp_data->old_opp.supplies = NULL;
>                 opp_table->set_opp_data->new_opp.supplies = NULL;
>         }

And some more as pointed out by Dmitry (I will resend it again
properly).

t a/drivers/opp/core.c b/drivers/opp/core.c
index d8ca15d96ce9..747bdc4338f3 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -2118,8 +2118,12 @@ void dev_pm_opp_unregister_set_opp_helper(struct opp_table *opp_table)
        WARN_ON(!list_empty(&opp_table->opp_list));
 
        opp_table->set_opp = NULL;
+
+       mutex_lock(&opp_table->lock);
        kfree(opp_table->set_opp_data);
        opp_table->set_opp_data = NULL;
+       mutex_unlock(&opp_table->lock);
+
        dev_pm_opp_put_opp_table(opp_table);
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_unregister_set_opp_helper);

-- 
viresh