linux-kernel - Re: [PATCH v4 5/8] drm/panel: panel-simple: Implement .get

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Date:   Tue, 7 Jun 2022 11:54:43 +0800
From:   Hsin-Yi Wang <hsinyi@...omium.org>
To:     Sam Ravnborg <sam@...nborg.org>
Cc:     Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Matthias Brugger <matthias.bgg@...il.com>,
        dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org,
        Rob Clark <robdclark@...omium.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 5/8] drm/panel: panel-simple: Implement
 .get_orientation callback

On Tue, Jun 7, 2022 at 3:25 AM Sam Ravnborg <sam@...nborg.org> wrote:
>
> Hi Hsin-Yi,
>
> On Mon, Jun 06, 2022 at 11:24:28PM +0800, Hsin-Yi Wang wrote:
> > To return the orientation property to drm/kms driver.
> >
> > Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
> > Reviewed-by: Hans de Goede <hdegoede@...hat.com>
> > Reviewed-by: Douglas Anderson <dianders@...omium.org>
> > ---
> >  drivers/gpu/drm/panel/panel-simple.c | 16 +++++++++++++++-
> >  1 file changed, 15 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
> > index 4a2e580a2f7b..f232b8cf4075 100644
> > --- a/drivers/gpu/drm/panel/panel-simple.c
> > +++ b/drivers/gpu/drm/panel/panel-simple.c
> > @@ -411,7 +411,12 @@ static int panel_simple_get_modes(struct drm_panel *panel,
> >       /* add hard-coded panel modes */
> >       num += panel_simple_get_non_edid_modes(p, connector);
> >
> > -     /* set up connector's "panel orientation" property */
> > +     /*
> > +      * drm drivers are expected to call drm_panel_get_orientation() to get
> > +      * panel's orientation then drm_connector_set_panel_orientation() to
> > +      * set the property before drm_dev_register(). Otherwise there will be
> > +      * a WARN_ON if orientation is set after drm is registered.
> > +      */
>
> This comment is not really relevant here. If we need to explain this
> then put it in drm_panel.c/h - as this applies for all panels and not
> just the panel_simple.
> Keep in mind, this is the source new panels often use a inspiration and
> no need to have this copied around.
>
Will update this.

> >       drm_connector_set_panel_orientation(connector, p->orientation);
> >
> >       return num;
> > @@ -434,6 +439,14 @@ static int panel_simple_get_timings(struct drm_panel *panel,
> >       return p->desc->num_timings;
> >  }
> >
> > +static enum drm_panel_orientation panel_simple_get_orientation(struct drm_panel *panel)
> > +{
> > +       struct panel_simple *p = to_panel_simple(panel);
> > +
> > +       return p->orientation;
> > +}
> > +
> > +
> >  static const struct drm_panel_funcs panel_simple_funcs = {
> >       .disable = panel_simple_disable,
> >       .unprepare = panel_simple_unprepare,
> > @@ -441,6 +454,7 @@ static const struct drm_panel_funcs panel_simple_funcs = {
> >       .enable = panel_simple_enable,
> >       .get_modes = panel_simple_get_modes,
> >       .get_timings = panel_simple_get_timings,
> > +     .get_orientation = panel_simple_get_orientation,
>
> I like the order in this list to match the order in the .h file.
> So my OCD would like you to move it up right after get_modes,
> but feel free to ignore this.
>
Sure.

> With the suggested changes:
> Reviewed-by: Sam Ravnborg <sam@...nborg.org>
>
> >  };
> >
> >  static struct panel_desc panel_dpi;
> > --
> > 2.36.1.255.ge46751e96f-goog