linux-kernel - Re: [PATCH 11/15] drm/panfrost: set devfreq clock name

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Message-ID: <CAJiuCce2vb+M5Dn7FSr=N2WfrAEQrUjLPuShqFyPFxwfrdDqaA@mail.gmail.com>
Date:   Fri, 29 May 2020 14:35:54 +0200
From:   Clément Péron <peron.clem@...il.com>
To:     Steven Price <steven.price@....com>
Cc:     Rob Herring <robh@...nel.org>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>,
        Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Stephen Boyd <sboyd@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 11/15] drm/panfrost: set devfreq clock name

Hi Steven,

On Thu, 28 May 2020 at 15:23, Steven Price <steven.price@....com> wrote:
>
> On 10/05/2020 17:55, Clément Péron wrote:
> > Some SoCs have  several clocks defined and the OPP core
> > needs to know the exact name of the clk to use.
> >
> > Set the clock name to "core".
> >
> > Signed-off-by: Clément Péron <peron.clem@...il.com>
>
> This is unfortunately a regression for the RK3288. The device tree
> binding doesn't require "clock-names", and for the RK3288 it currently
> isn't specified. So this breaks the platform.
>
> Adding the "clock-names" to the device tree 'fixes' it, but we really
> need to keep backwards compatibility.

Yes you're right, thanks for cathing this.

Regards,
Clement

>
> Steve
>
> > ---
> >   drivers/gpu/drm/panfrost/panfrost_devfreq.c | 13 +++++++++++++
> >   drivers/gpu/drm/panfrost/panfrost_devfreq.h |  1 +
> >   2 files changed, 14 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> > index 9ffea0d4a087..6bf3541b4d53 100644
> > --- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> > +++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> > @@ -103,6 +103,14 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
> >
> >       spin_lock_init(&pfdevfreq->lock);
> >
> > +     opp_table = dev_pm_opp_set_clkname(dev, "core");
> > +     if (IS_ERR(opp_table)) {
> > +             ret = PTR_ERR(opp_table);
> > +             goto err_fini;
> > +     }
> > +
> > +     pfdevfreq->clkname_opp_table = opp_table;
> > +
> >       opp_table = dev_pm_opp_set_regulators(dev, pfdev->comp->supply_names,
> >                                             pfdev->comp->num_supplies);
> >       if (IS_ERR(opp_table)) {
> > @@ -176,6 +184,11 @@ void panfrost_devfreq_fini(struct panfrost_device *pfdev)
> >               dev_pm_opp_put_regulators(pfdevfreq->regulators_opp_table);
> >               pfdevfreq->regulators_opp_table = NULL;
> >       }
> > +
> > +     if (pfdevfreq->clkname_opp_table) {
> > +             dev_pm_opp_put_clkname(pfdevfreq->clkname_opp_table);
> > +             pfdevfreq->clkname_opp_table = NULL;
> > +     }
> >   }
> >
> >   void panfrost_devfreq_resume(struct panfrost_device *pfdev)
> > diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.h b/drivers/gpu/drm/panfrost/panfrost_devfreq.h
> > index 347cde4786cf..1f2475e1d034 100644
> > --- a/drivers/gpu/drm/panfrost/panfrost_devfreq.h
> > +++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.h
> > @@ -16,6 +16,7 @@ struct panfrost_device;
> >   struct panfrost_devfreq {
> >       struct devfreq *devfreq;
> >       struct opp_table *regulators_opp_table;
> > +     struct opp_table *clkname_opp_table;
> >       struct thermal_cooling_device *cooling;
> >       bool opp_of_table_added;
> >
> >
>