diff options
Diffstat (limited to 'drivers/gpu/drm/drm_panel.c')
| -rw-r--r-- | drivers/gpu/drm/drm_panel.c | 85 |
1 files changed, 44 insertions, 41 deletions
diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c index 8c7bac85a793..f634371c717a 100644 --- a/drivers/gpu/drm/drm_panel.c +++ b/drivers/gpu/drm/drm_panel.c @@ -70,16 +70,12 @@ EXPORT_SYMBOL(drm_panel_init); * * Add a panel to the global registry so that it can be looked up by display * drivers. - * - * Return: 0 on success or a negative error code on failure. */ -int drm_panel_add(struct drm_panel *panel) +void drm_panel_add(struct drm_panel *panel) { mutex_lock(&panel_lock); list_add_tail(&panel->list, &panel_list); mutex_unlock(&panel_lock); - - return 0; } EXPORT_SYMBOL(drm_panel_add); @@ -98,42 +94,6 @@ void drm_panel_remove(struct drm_panel *panel) EXPORT_SYMBOL(drm_panel_remove); /** - * drm_panel_attach - attach a panel to a connector - * @panel: DRM panel - * @connector: DRM connector - * - * After obtaining a pointer to a DRM panel a display driver calls this - * function to attach a panel to a connector. - * - * An error is returned if the panel is already attached to another connector. - * - * When unloading, the driver should detach from the panel by calling - * drm_panel_detach(). - * - * Return: 0 on success or a negative error code on failure. - */ -int drm_panel_attach(struct drm_panel *panel, struct drm_connector *connector) -{ - return 0; -} -EXPORT_SYMBOL(drm_panel_attach); - -/** - * drm_panel_detach - detach a panel from a connector - * @panel: DRM panel - * - * Detaches a panel from the connector it is attached to. If a panel is not - * attached to any connector this is effectively a no-op. - * - * This function should not be called by the panel device itself. It - * is only for the drm device that called drm_panel_attach(). - */ -void drm_panel_detach(struct drm_panel *panel) -{ -} -EXPORT_SYMBOL(drm_panel_detach); - -/** * drm_panel_prepare - power on a panel * @panel: DRM panel * @@ -300,6 +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) |