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Message-ID: <CAJMQK-joqHaJeTNurzecmXcZ_eiK+24Tc0ok2zcFdUNXz3TQmQ@mail.gmail.com>
Date: Tue, 7 Jun 2022 15:53:31 +0800
From: Hsin-Yi Wang <hsinyi@...omium.org>
To: Stephen Boyd <swboyd@...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@...ts.freedesktop.org,
linux-mediatek@...ts.infradead.org,
Rob Clark <robdclark@...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 1/8] drm/panel: Add an API drm_panel_get_orientation()
to return panel orientation
On Tue, Jun 7, 2022 at 3:06 AM Stephen Boyd <swboyd@...omium.org> wrote:
>
> Quoting Hsin-Yi Wang (2022-06-06 08:24:24)
> > diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c
> > index f634371c717a..e12056cfeca8 100644
> > --- a/drivers/gpu/drm/drm_panel.c
> > +++ b/drivers/gpu/drm/drm_panel.c
> > @@ -223,6 +223,15 @@ int drm_panel_get_modes(struct drm_panel *panel,
> > }
> > EXPORT_SYMBOL(drm_panel_get_modes);
> >
> > +enum drm_panel_orientation drm_panel_get_orientation(struct drm_panel *panel)
>
> Should 'panel' be marked const to indicate that it can't be modified?
>
But .get_orientation() will need to call to_XXX_panel, eg.
static inline struct boe_panel *to_boe_panel(struct drm_panel *panel)
==> .get_modes(panel) <-- can't be const.
==> drm_panel_get_orientation(panel) <-- can't be const.
We can definitely cast it in the functions, or make to_XXX_panel()
accept const, but I think this will lose the meaning of using const
anyway.
> > +{
> > + if (panel && panel->funcs && panel->funcs->get_orientation)
> > + return panel->funcs->get_orientation(panel);
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