linux-kernel - Re: [PATCH v2 4/4] media: platform: Add Renesas RZ/G2L CRU driver

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Message-ID: <CA+V-a8sNVJe5o5taQrEzLis0KbdihVv+JzSHU26FUfD=ctPhhg@mail.gmail.com>
Date:   Sat, 24 Sep 2022 12:38:03 +0100
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Jacopo Mondi <jacopo@...ndi.org>,
        Niklas Söderlund <niklas.soderlund@...natech.se>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [PATCH v2 4/4] media: platform: Add Renesas RZ/G2L CRU driver

Hi Sakari,

Thank you for the review.

On Fri, Sep 23, 2022 at 9:14 PM Sakari Ailus
<sakari.ailus@...ux.intel.com> wrote:
>
> Hi Prabhakar,
>
> On Tue, Sep 06, 2022 at 12:04:06AM +0100, Lad Prabhakar wrote:
> ...
>
> > +#define to_buf_list(vb2_buffer) (&container_of(vb2_buffer, \
> > +                                             struct rzg2l_cru_buffer, \
> > +                                             vb)->list)
>
> #define to_buf_list(vb2_buffer) \
>         (&container_of(vb2_buffer, struct rzg2l_cru_buffer, vb)->list)
>
OK.

>
> ...
>
> > +static int rzg2l_cru_open(struct file *file)
> > +{
> > +     struct rzg2l_cru_dev *cru = video_drvdata(file);
> > +     int ret;
> > +
> > +     ret = clk_prepare_enable(cru->pclk);
> > +     if (ret)
> > +             return ret;
> > +
> > +     ret = clk_prepare_enable(cru->vclk);
> > +     if (ret)
> > +             goto disable_pclk;
> > +
> > +     ret = clk_prepare_enable(cru->aclk);
> > +     if (ret)
> > +             goto disable_vclk;
> > +
> > +     ret = mutex_lock_interruptible(&cru->lock);
> > +     if (ret)
> > +             goto disable_aclk;
> > +
> > +     file->private_data = cru;
> > +     ret = v4l2_fh_open(file);
> > +     if (ret)
> > +             goto err_unlock;
> > +
> > +     ret = v4l2_pipeline_pm_get(&cru->vdev.entity);
>
> Please use runtime PM instead in sensor drivers, we're trying to get rid of
> this function.
>
OK.

> It'd be nice to have it in this one as well.
>
I'll will switch to runtime PM.

> > +     if (ret < 0)
> > +             goto err_open;
> > +
> > +     mutex_unlock(&cru->lock);
> > +
> > +     return 0;
> > +err_open:
> > +     v4l2_fh_release(file);
> > +err_unlock:
> > +     mutex_unlock(&cru->lock);
> > +disable_aclk:
> > +     clk_disable_unprepare(cru->aclk);
> > +disable_vclk:
> > +     clk_disable_unprepare(cru->vclk);
> > +disable_pclk:
> > +     clk_disable_unprepare(cru->pclk);
> > +
> > +     return ret;
> > +}
>
> ...
>
> > +void rzg2l_cru_v4l2_unregister(struct rzg2l_cru_dev *cru)
> > +{
> > +     if (!video_is_registered(&cru->vdev))
> > +             return;
> > +
> > +     v4l2_info(&cru->v4l2_dev, "Removed %s\n",
> > +               video_device_node_name(&cru->vdev));
>
> I'd just leave this out. Same for the similar message on registration.
>
OK, I'll drop both the messages.

Cheers,
Prabhakar