linux-kernel - Re: [PATCH v2 3/8] drm/panel: panel-edp: Implement .get

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Message-ID: <CAJMQK-g7CdR8sgVssGGYPCaeGz3dKwqsWBnCRCdMvsh1Mtph6g@mail.gmail.com>
Date:   Fri, 3 Jun 2022 12:01:06 +0800
From:   Hsin-Yi Wang <hsinyi@...omium.org>
To:     Doug Anderson <dianders@...omium.org>
Cc:     Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        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 <dri-devel@...ts.freedesktop.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        Rob Clark <robdclark@...omium.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Rob Herring <robh+dt@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/8] drm/panel: panel-edp: Implement .get_orientation callback

On Fri, Jun 3, 2022 at 5:51 AM Doug Anderson <dianders@...omium.org> wrote:
>
> Hi,
>
> On Wed, Jun 1, 2022 at 2:46 AM Hsin-Yi Wang <hsinyi@...omium.org> 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>
> > ---
> >  drivers/gpu/drm/panel/panel-edp.c | 8 ++++++++
> >  1 file changed, 8 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/panel/panel-edp.c b/drivers/gpu/drm/panel/panel-edp.c
> > index 1732b4f56e38..a2133581a72d 100644
> > --- a/drivers/gpu/drm/panel/panel-edp.c
> > +++ b/drivers/gpu/drm/panel/panel-edp.c
> > @@ -609,6 +609,13 @@ static int panel_edp_get_timings(struct drm_panel *panel,
> >         return p->desc->num_timings;
> >  }
> >
> > +static enum drm_panel_orientation panel_edp_get_orientation(struct drm_panel *panel)
> > +{
> > +       struct panel_edp *p = to_panel_edp(panel);
> > +
> > +       return p->orientation;
> > +}
> > +
> >  static int detected_panel_show(struct seq_file *s, void *data)
> >  {
> >         struct drm_panel *panel = s->private;
> > @@ -637,6 +644,7 @@ static const struct drm_panel_funcs panel_edp_funcs = {
> >         .prepare = panel_edp_prepare,
> >         .enable = panel_edp_enable,
> >         .get_modes = panel_edp_get_modes,
> > +       .get_orientation = panel_edp_get_orientation,
> >         .get_timings = panel_edp_get_timings,
> >         .debugfs_init = panel_edp_debugfs_init,
> >  };
>
> I'm curious: should we be removing the old
> drm_connector_set_panel_orientation() from panel_edp_get_modes()?
> ...or maybe you want to keep it for now because you're only adding
> support to the mediatek driver and for other drivers the WARN_ON is
> better than no orientation support at all?

Right, for the drm/kms drivers that calls
drm_connector_set_panel_orientation(), the
drm_connector_set_panel_orientation() called in panels is no-op, but
others they still need this to be called in the panel.
>
> Maybe you could put a comment next to the old
> drm_connector_set_panel_orientation() saying that it's deprecated and
> that drm drivers are expected to add a call to get_orientation()? Then
> when people see the WARN_ON splat they'll quickly figure out how to
> fix it. ...and eventually we can probably remove all the old calls
> from get_modes() ?
Sure, sounds good to me. I will add this.

>
> -Doug