drm/panel: Add helper for reading DT rotation (5f3e7503) · Commits · 戴 / test

drivers/gpu/drm/drm_panel.c

+43 −0

Original line number	Diff line number	Diff line
		@@ -260,6 +260,49 @@ 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. Return a negative error code on failure.
		*/
		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

		#if IS_REACHABLE(CONFIG_BACKLIGHT_CLASS_DEVICE)

include/drm/drm_panel.h

+10 −0

Original line number	Diff line number	Diff line
		@@ -35,6 +35,8 @@ struct drm_device;
		struct drm_panel;
		struct display_timing;

		enum drm_panel_orientation;

		/**
		* struct drm_panel_funcs - perform operations on a given panel
		*
		@@ -188,11 +190,19 @@ int drm_panel_get_modes(struct drm_panel panel, struct drm_connector connector

		#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

		#if IS_ENABLED(CONFIG_DRM_PANEL) && (IS_BUILTIN(CONFIG_BACKLIGHT_CLASS_DEVICE) \|\| \

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