103 lines
3.2 KiB
Diff
103 lines
3.2 KiB
Diff
From c74b76bb8a4da44a9f8cf06f4aba9f3334e1a148 Mon Sep 17 00:00:00 2001
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From: Derek Basehore <dbasehore@chromium.org>
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Date: Tue, 9 Jul 2019 19:16:56 -0700
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Subject: [PATCH 1/4] drm/panel: Add helper for reading DT rotation
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This adds a helper function for reading the rotation (panel
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orientation) from the device tree.
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Signed-off-by: Derek Basehore <dbasehore@chromium.org>
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---
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drivers/gpu/drm/drm_panel.c | 43 +++++++++++++++++++++++++++++++++++++
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include/drm/drm_panel.h | 9 ++++++++
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2 files changed, 52 insertions(+)
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diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c
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index d37b83f40..b2d8fa2c3 100644
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--- a/drivers/gpu/drm/drm_panel.c
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+++ b/drivers/gpu/drm/drm_panel.c
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@@ -168,6 +168,49 @@ struct drm_panel *of_drm_find_panel(const struct device_node *np)
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return ERR_PTR(-EPROBE_DEFER);
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}
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EXPORT_SYMBOL(of_drm_find_panel);
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+
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+/**
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+ * of_drm_get_panel_orientation - look up the orientation of the panel through
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+ * the "rotation" binding from a device tree node
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+ * @np: device tree node of the panel
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+ * @orientation: orientation enum to be filled in
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+ *
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+ * Looks up the rotation of a panel in the device tree. The orientation of the
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+ * panel is expressed as a property name "rotation" in the device tree. The
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+ * rotation in the device tree is counter clockwise.
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+ *
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+ * Return: 0 when a valid rotation value (0, 90, 180, or 270) is read or the
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+ * rotation property doesn't exist. -EERROR otherwise.
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+ */
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+int of_drm_get_panel_orientation(const struct device_node *np,
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+ enum drm_panel_orientation *orientation)
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+{
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+ int rotation, ret;
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+
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+ ret = of_property_read_u32(np, "rotation", &rotation);
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+ if (ret == -EINVAL) {
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+ /* Don't return an error if there's no rotation property. */
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+ *orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
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+ return 0;
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+ }
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+
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+ if (ret < 0)
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+ return ret;
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+
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+ if (rotation == 0)
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+ *orientation = DRM_MODE_PANEL_ORIENTATION_NORMAL;
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+ else if (rotation == 90)
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+ *orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP;
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+ else if (rotation == 180)
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+ *orientation = DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP;
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+ else if (rotation == 270)
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+ *orientation = DRM_MODE_PANEL_ORIENTATION_LEFT_UP;
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+ else
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+ return -EINVAL;
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+
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+ return 0;
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+}
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+EXPORT_SYMBOL(of_drm_get_panel_orientation);
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#endif
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int drm_panel_notifier_register(struct drm_panel *panel,
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diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h
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index 6aab8fefc..c58c4c19f 100644
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--- a/include/drm/drm_panel.h
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+++ b/include/drm/drm_panel.h
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@@ -53,6 +53,8 @@ struct drm_device;
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struct drm_panel;
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struct display_timing;
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+enum drm_panel_orientation;
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+
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/**
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* @loader_protect: protect loader logo panel's power
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* struct drm_panel_funcs - perform operations on a given panel
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@@ -240,11 +242,18 @@ int drm_panel_notifier_call_chain(struct drm_panel *panel,
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#if defined(CONFIG_OF) && defined(CONFIG_DRM_PANEL)
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struct drm_panel *of_drm_find_panel(const struct device_node *np);
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+int of_drm_get_panel_orientation(const struct device_node *np,
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+ enum drm_panel_orientation *orientation);
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#else
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static inline struct drm_panel *of_drm_find_panel(const struct device_node *np)
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{
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return ERR_PTR(-ENODEV);
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}
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+static inline int of_drm_get_panel_orientation(const struct device_node *np,
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+ enum drm_panel_orientation *orientation)
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+{
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+ return -ENODEV;
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+}
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#endif
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#endif
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--
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2.34.1
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