From: Derek Basehore <dbasehore@chromium.org>
To: linux-kernel@vger.kernel.org
Cc: Derek Basehore <dbasehore@chromium.org>,
Philipp Zabel <p.zabel@pengutronix.de>,
Maxime Ripard <maxime.ripard@bootlin.com>,
Sam Ravnborg <sam@ravnborg.org>,
intel-gfx@lists.freedesktop.org,
Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Jani Nikula <jani.nikula@linux.intel.com>,
David Airlie <airlied@linux.ie>,
Thierry Reding <thierry.reding@gmail.com>,
Matthias Brugger <matthias.bgg@gmail.com>,
dri-devel@lists.freedesktop.org, Daniel Vetter <daniel@ffwll.ch>,
Rodrigo Vivi <rodrigo.vivi@intel.com>, CK Hu <ck.hu@mediatek.com>,
linux-mediatek@lists.infradead.org, Sean Paul <sean@poorly.run>,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH v8 1/4] drm/panel: Add helper for reading DT rotation
Date: Wed, 25 Sep 2019 15:58:30 -0700 [thread overview]
Message-ID: <20190925225833.7310-2-dbasehore@chromium.org> (raw)
In-Reply-To: <20190925225833.7310-1-dbasehore@chromium.org>
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>
---
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
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next prev parent reply other threads:[~2019-09-25 22:59 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 ` Derek Basehore [this message]
2019-10-07 16:38 ` [PATCH v8 1/4] drm/panel: Add helper for reading DT rotation Sean Paul
2019-10-07 22:12 ` dbasehore .
2019-10-08 14:56 ` Sean Paul
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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