From: Sean Paul <sean@poorly.run>
To: "dbasehore ." <dbasehore@chromium.org>
Cc: Sean Paul <sean@poorly.run>,
linux-kernel <linux-kernel@vger.kernel.org>,
Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Maxime Ripard <maxime.ripard@bootlin.com>,
David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
Thierry Reding <thierry.reding@gmail.com>,
Sam Ravnborg <sam@ravnborg.org>,
Jani Nikula <jani.nikula@linux.intel.com>,
Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
Rodrigo Vivi <rodrigo.vivi@intel.com>, CK Hu <ck.hu@mediatek.com>,
Philipp Zabel <p.zabel@pengutronix.de>,
Matthias Brugger <matthias.bgg@gmail.com>,
dri-devel <dri-devel@lists.freedesktop.org>,
Intel Graphics <intel-gfx@lists.freedesktop.org>,
"moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE"
<linux-arm-kernel@lists.infradead.org>,
"moderated list:ARM/Mediatek SoC support"
<linux-mediatek@lists.infradead.org>
Subject: Re: [PATCH v8 1/4] drm/panel: Add helper for reading DT rotation
Date: Tue, 8 Oct 2019 10:56:23 -0400 [thread overview]
Message-ID: <20191008145623.GA85762@art_vandelay> (raw)
In-Reply-To: <CAGAzgspJa1b1V06s3Om+OAbPLqWsWSptbVtQApEPAXDA7W-VSQ@mail.gmail.com>
On Mon, Oct 07, 2019 at 03:12:00PM -0700, dbasehore . wrote:
> On Mon, Oct 7, 2019 at 9:38 AM Sean Paul <sean@poorly.run> wrote:
> >
> > On Wed, Sep 25, 2019 at 03:58:30PM -0700, Derek Basehore wrote:
> > > This adds a helper function for reading the rotation (panel
> > > orientation) from the device tree.
> > >
> > > Signed-off-by: Derek Basehore <dbasehore@chromium.org>
> > > Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
> >
> > The patch LGTM, but I don't see it used anywhere later in the patch? Is there a
> > panel driver incoming?
>
> Yeah, the boe-tv101wum-nl6 panel will use it. It's not in the patch
> currently sent upstream since I don't want to step on their toes, but
> I plan on sending a patch to add it as soon as that is merged.
>
> I could hold back on this patch until that panel driver is merged too.
Yeah, I think it's probably best. I don't anticipate any changes will be
required, but it's always best to review the code end-to-end.
I haven't checked in on that review, but if it's close to landing, you can also
add a patch to this stack that is based on the in-flight patches. That way we can
get all the review out of the way and then when the panel lands, we can apply
your add-on with the rest of the series.
Sean
> Another alternative is to throw this into the generic drm_panel code,
> but there's no obvious place to put it since DRM seems to leave
> reading the DTS up to the panel drivers themselves.
>
> >
> > Sean
> >
> > > ---
> > > drivers/gpu/drm/drm_panel.c | 43 +++++++++++++++++++++++++++++++++++++
> > > include/drm/drm_panel.h | 9 ++++++++
> > > 2 files changed, 52 insertions(+)
> > >
> > > diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c
> > > index 6b0bf42039cf..0909b53b74e6 100644
> > > --- a/drivers/gpu/drm/drm_panel.c
> > > +++ b/drivers/gpu/drm/drm_panel.c
> > > @@ -264,6 +264,49 @@ struct drm_panel *of_drm_find_panel(const struct device_node *np)
> > > return ERR_PTR(-EPROBE_DEFER);
> > > }
> > > EXPORT_SYMBOL(of_drm_find_panel);
> > > +
> > > +/**
> > > + * of_drm_get_panel_orientation - look up the orientation of the panel through
> > > + * the "rotation" binding from a device tree node
> > > + * @np: device tree node of the panel
> > > + * @orientation: orientation enum to be filled in
> > > + *
> > > + * Looks up the rotation of a panel in the device tree. The orientation of the
> > > + * panel is expressed as a property name "rotation" in the device tree. The
> > > + * rotation in the device tree is counter clockwise.
> > > + *
> > > + * Return: 0 when a valid rotation value (0, 90, 180, or 270) is read or the
> > > + * rotation property doesn't exist. -EERROR otherwise.
> > > + */
> > > +int of_drm_get_panel_orientation(const struct device_node *np,
> > > + enum drm_panel_orientation *orientation)
> > > +{
> > > + int rotation, ret;
> > > +
> > > + ret = of_property_read_u32(np, "rotation", &rotation);
> > > + if (ret == -EINVAL) {
> > > + /* Don't return an error if there's no rotation property. */
> > > + *orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
> > > + return 0;
> > > + }
> > > +
> > > + if (ret < 0)
> > > + return ret;
> > > +
> > > + if (rotation == 0)
> > > + *orientation = DRM_MODE_PANEL_ORIENTATION_NORMAL;
> > > + else if (rotation == 90)
> > > + *orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP;
> > > + else if (rotation == 180)
> > > + *orientation = DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP;
> > > + else if (rotation == 270)
> > > + *orientation = DRM_MODE_PANEL_ORIENTATION_LEFT_UP;
> > > + else
> > > + return -EINVAL;
> > > +
> > > + return 0;
> > > +}
> > > +EXPORT_SYMBOL(of_drm_get_panel_orientation);
> > > #endif
> > >
> > > MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
> > > diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h
> > > index 624bd15ecfab..d16158deacdc 100644
> > > --- a/include/drm/drm_panel.h
> > > +++ b/include/drm/drm_panel.h
> > > @@ -34,6 +34,8 @@ struct drm_device;
> > > struct drm_panel;
> > > struct display_timing;
> > >
> > > +enum drm_panel_orientation;
> > > +
> > > /**
> > > * struct drm_panel_funcs - perform operations on a given panel
> > > *
> > > @@ -165,11 +167,18 @@ int drm_panel_get_modes(struct drm_panel *panel);
> > >
> > > #if defined(CONFIG_OF) && defined(CONFIG_DRM_PANEL)
> > > struct drm_panel *of_drm_find_panel(const struct device_node *np);
> > > +int of_drm_get_panel_orientation(const struct device_node *np,
> > > + enum drm_panel_orientation *orientation);
> > > #else
> > > static inline struct drm_panel *of_drm_find_panel(const struct device_node *np)
> > > {
> > > return ERR_PTR(-ENODEV);
> > > }
> > > +static inline int of_drm_get_panel_orientation(const struct device_node *np,
> > > + enum drm_panel_orientation *orientation)
> > > +{
> > > + return -ENODEV;
> > > +}
> > > #endif
> > >
> > > #endif
> > > --
> > > 2.23.0.351.gc4317032e6-goog
> > >
> >
> > --
> > Sean Paul, Software Engineer, Google / Chromium OS
--
Sean Paul, Software Engineer, Google / Chromium OS
next prev parent reply other threads:[~2019-10-08 14:56 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-25 22:58 [PATCH v8 0/4] Panel rotation patches Derek Basehore
2019-09-25 22:58 ` [PATCH v8 1/4] drm/panel: Add helper for reading DT rotation Derek Basehore
2019-10-07 16:38 ` Sean Paul
2019-10-07 22:12 ` dbasehore .
2019-10-08 14:56 ` Sean Paul [this message]
2019-09-25 22:58 ` [PATCH v8 2/4] drm/panel: set display info in panel attach Derek Basehore
2019-09-29 5:23 ` [v8,2/4] " james qian wang (Arm Technology China)
2019-09-30 23:14 ` dbasehore .
2019-10-07 16:44 ` Sean Paul
2019-10-07 22:01 ` dbasehore .
2019-10-08 15:02 ` Sean Paul
2019-09-25 22:58 ` [PATCH v8 3/4] drm/connector: Split out orientation quirk detection Derek Basehore
2019-10-07 16:45 ` Sean Paul
2019-09-25 22:58 ` [PATCH v8 4/4] drm/mtk: add panel orientation property Derek Basehore
2019-10-07 16:48 ` Sean Paul
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