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From: "Clément Péron" <peron.clem@gmail.com>
To: Steven Price <steven.price@arm.com>
Cc: Nishanth Menon <nm@ti.com>,
	Tomeu Vizoso <tomeu.vizoso@collabora.com>,
	Stephen Boyd <sboyd@kernel.org>,
	Viresh Kumar <vireshk@kernel.org>,
	dri-devel <dri-devel@lists.freedesktop.org>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	Chen-Yu Tsai <wens@csie.org>,
	Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Subject: Re: [PATCH 07/15] drm/panfrost: use device_property_present to check for OPP
Date: Fri, 29 May 2020 14:45:05 +0200	[thread overview]
Message-ID: <CAJiuCcfJnBxh6McsNLKJ=HegS6dCVNVOChCOrcPGWobU3G8KKg@mail.gmail.com> (raw)
In-Reply-To: <2f7a41d6-325d-3731-0a6a-fa2e41d4e33a@arm.com>

Hi Steven,

On Thu, 28 May 2020 at 15:22, Steven Price <steven.price@arm.com> wrote:
>
> On 10/05/2020 17:55, Clément Péron wrote:
> > Instead of expecting an error from dev_pm_opp_of_add_table()
> > do a simple device_property_present() check.
> >
> > Signed-off-by: Clément Péron <peron.clem@gmail.com>
>
> I'm not sure I understand why this is better. We seem to have more code
> to do roughly the same thing just with the hard-coded
> "operating-points-v2" name (if there's ever a 'v3' we'll then have to
> update this).
>
> Is the desire just to get an error on probe if the table is malformed?
> Have you hit this situation? If so this sounds like something which
> would be better fixed in the generic OPP code rather than Panfrost itself.

The idea was to avoid calling devfreq if there is no opp table.
But I think you're right we don't have to check for malformed
device-tree in the driver.

I will drop this patch,

Regards,
Clement


>
> Steve
>
> > ---
> >   drivers/gpu/drm/panfrost/panfrost_devfreq.c | 14 +++++++++-----
> >   1 file changed, 9 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> > index d9007f44b772..fce21c682414 100644
> > --- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> > +++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> > @@ -96,15 +96,19 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
> >       struct thermal_cooling_device *cooling;
> >       struct panfrost_devfreq *pfdevfreq = &pfdev->pfdevfreq;
> >
> > -     ret = dev_pm_opp_of_add_table(dev);
> > -     if (ret == -ENODEV) /* Optional, continue without devfreq */
> > +     if (!device_property_present(dev, "operating-points-v2"))
> > +             /* Optional, continue without devfreq */
> >               return 0;
> > -     else if (ret)
> > -             return ret;
> > -     pfdevfreq->opp_of_table_added = true;
> >
> >       spin_lock_init(&pfdevfreq->lock);
> >
> > +     ret = dev_pm_opp_of_add_table(dev);
> > +     if (ret) {
> > +             DRM_DEV_ERROR(dev, "Couldn't add OPP table\n");
> > +             goto err_fini;
> > +     }
> > +     pfdevfreq->opp_of_table_added = true;
> > +
> >       panfrost_devfreq_reset(pfdevfreq);
> >
> >       cur_freq = clk_get_rate(pfdev->clock);
> >
>
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  reply	other threads:[~2020-05-30  9:42 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-10 16:55 [PATCH 00/15][RFC] Add regulator devfreq support to Panfrost Clément Péron
2020-05-10 16:55 ` [PATCH 01/15] drm/panfrost: avoid static declaration Clément Péron
2020-05-28 13:22   ` Steven Price
2020-05-10 16:55 ` [PATCH 02/15] drm/panfrost: clean headers in devfreq Clément Péron
2020-05-28 13:22   ` Steven Price
2020-05-10 16:55 ` [PATCH 03/15] drm/panfrost: don't use pfdevfreq.busy_count to know if hw is idle Clément Péron
2020-05-28 13:22   ` Steven Price
2020-05-10 16:55 ` [PATCH 04/15] drm/panfrost: introduce panfrost_devfreq struct Clément Péron
2020-05-28 13:22   ` Steven Price
2020-05-10 16:55 ` [PATCH 05/15] drm/panfrost: use spinlock instead of atomic Clément Péron
2020-05-28 13:22   ` Steven Price
2020-05-29 12:20   ` Robin Murphy
2020-05-29 12:35     ` Clément Péron
2020-05-29 12:47       ` Steven Price
2020-05-10 16:55 ` [PATCH 06/15] drm/panfrost: properly handle error in probe Clément Péron
2020-05-28 13:22   ` Steven Price
2020-05-10 16:55 ` [PATCH 07/15] drm/panfrost: use device_property_present to check for OPP Clément Péron
2020-05-28 13:22   ` Steven Price
2020-05-29 12:45     ` Clément Péron [this message]
2020-05-10 16:55 ` [PATCH 08/15] drm/panfrost: move devfreq_init()/fini() in device Clément Péron
2020-05-28 13:22   ` Steven Price
2020-05-29 12:38     ` Clément Péron
2020-06-08 11:55       ` Tomeu Vizoso
2020-05-10 16:55 ` [PATCH 09/15] drm/panfrost: dynamically alloc regulators Clément Péron
2020-05-28 13:22   ` Steven Price
2020-05-10 16:55 ` [PATCH 10/15] drm/panfrost: add regulators to devfreq Clément Péron
2020-05-28 13:23   ` Steven Price
2020-05-29 12:37     ` Clément Péron
2020-05-10 16:55 ` [PATCH 11/15] drm/panfrost: set devfreq clock name Clément Péron
2020-05-28 13:23   ` Steven Price
2020-05-29 12:35     ` Clément Péron
2020-05-10 16:55 ` [PATCH 12/15] arm64: defconfig: Enable devfreq cooling device Clément Péron
2020-05-10 16:55 ` [PATCH 13/15] arm64: dts: allwinner: h6: Add cooling map for GPU Clément Péron
2020-05-10 16:55 ` [PATCH 14/15] [DO NOT MERGE] arm64: dts: allwinner: h6: Add GPU OPP table Clément Péron
2020-05-10 16:55 ` [PATCH 15/15] [DO NOT MERGE] arm64: dts: allwinner: force GPU regulator to be always Clément Péron
2020-05-11  5:43 ` [PATCH 00/15][RFC] Add regulator devfreq support to Panfrost Tomeu Vizoso

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