4  * Permission is hereby granted, free of charge, to any person obtaining a
17  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
42  * For easy integration into drivers using the &drm_bridge infrastructure please
47  * drm_panel_init - initialize a panel
63 	INIT_LIST_HEAD(&panel->list);  in drm_panel_init()
64 	INIT_LIST_HEAD(&panel->followers);  in drm_panel_init()
65 	mutex_init(&panel->follower_lock);  in drm_panel_init()
66 	panel->dev = dev;  in drm_panel_init()
67 	panel->funcs = funcs;  in drm_panel_init()
68 	panel->connector_type = connector_type;  in drm_panel_init()
73  * drm_panel_add - add a panel to the global registry
82 	list_add_tail(&panel->list, &panel_list);  in drm_panel_add()
88  * drm_panel_remove - remove a panel from the global registry
96 	list_del_init(&panel->list);  in drm_panel_remove()
102  * drm_panel_prepare - power on a panel
117 		return -EINVAL;  in drm_panel_prepare()
119 	if (panel->prepared) {  in drm_panel_prepare()
120 		dev_warn(panel->dev, "Skipping prepare of already prepared panel\n");  in drm_panel_prepare()
124 	mutex_lock(&panel->follower_lock);  in drm_panel_prepare()
126 	if (panel->funcs && panel->funcs->prepare) {  in drm_panel_prepare()
127 		ret = panel->funcs->prepare(panel);  in drm_panel_prepare()
131 	panel->prepared = true;  in drm_panel_prepare()
133 	list_for_each_entry(follower, &panel->followers, list) {  in drm_panel_prepare()
134 		ret = follower->funcs->panel_prepared(follower);  in drm_panel_prepare()
136 			dev_info(panel->dev, "%ps failed: %d\n",  in drm_panel_prepare()
137 				 follower->funcs->panel_prepared, ret);  in drm_panel_prepare()
142 	mutex_unlock(&panel->follower_lock);  in drm_panel_prepare()
149  * drm_panel_unprepare - power off a panel
165 		return -EINVAL;  in drm_panel_unprepare()
167 	if (!panel->prepared) {  in drm_panel_unprepare()
168 		dev_warn(panel->dev, "Skipping unprepare of already unprepared panel\n");  in drm_panel_unprepare()
172 	mutex_lock(&panel->follower_lock);  in drm_panel_unprepare()
174 	list_for_each_entry(follower, &panel->followers, list) {  in drm_panel_unprepare()
175 		ret = follower->funcs->panel_unpreparing(follower);  in drm_panel_unprepare()
177 			dev_info(panel->dev, "%ps failed: %d\n",  in drm_panel_unprepare()
178 				 follower->funcs->panel_unpreparing, ret);  in drm_panel_unprepare()
181 	if (panel->funcs && panel->funcs->unprepare) {  in drm_panel_unprepare()
182 		ret = panel->funcs->unprepare(panel);  in drm_panel_unprepare()
186 	panel->prepared = false;  in drm_panel_unprepare()
190 	mutex_unlock(&panel->follower_lock);  in drm_panel_unprepare()
197  * drm_panel_enable - enable a panel
211 		return -EINVAL;  in drm_panel_enable()
213 	if (panel->enabled) {  in drm_panel_enable()
214 		dev_warn(panel->dev, "Skipping enable of already enabled panel\n");  in drm_panel_enable()
218 	if (panel->funcs && panel->funcs->enable) {  in drm_panel_enable()
219 		ret = panel->funcs->enable(panel);  in drm_panel_enable()
223 	panel->enabled = true;  in drm_panel_enable()
225 	ret = backlight_enable(panel->backlight);  in drm_panel_enable()
227 		DRM_DEV_INFO(panel->dev, "failed to enable backlight: %d\n",  in drm_panel_enable()
235  * drm_panel_disable - disable a panel
249 		return -EINVAL;  in drm_panel_disable()
251 	if (!panel->enabled) {  in drm_panel_disable()
252 		dev_warn(panel->dev, "Skipping disable of already disabled panel\n");  in drm_panel_disable()
256 	ret = backlight_disable(panel->backlight);  in drm_panel_disable()
258 		DRM_DEV_INFO(panel->dev, "failed to disable backlight: %d\n",  in drm_panel_disable()
261 	if (panel->funcs && panel->funcs->disable) {  in drm_panel_disable()
262 		ret = panel->funcs->disable(panel);  in drm_panel_disable()
266 	panel->enabled = false;  in drm_panel_disable()
273  * drm_panel_get_modes - probe the available display modes of a panel
289 	if (panel->funcs && panel->funcs->get_modes) {  in drm_panel_get_modes()
292 		num = panel->funcs->get_modes(panel, connector);  in drm_panel_get_modes()
303  * of_drm_find_panel - look up a panel using a device tree node
314  * - EPROBE_DEFER: the panel device has not been probed yet, and the caller
316  * - ENODEV: the device is not available (status != "okay" or "ok")
323 		return ERR_PTR(-ENODEV);  in of_drm_find_panel()
328 		if (panel->dev->of_node == np) {  in of_drm_find_panel()
335 	return ERR_PTR(-EPROBE_DEFER);  in of_drm_find_panel()
340  * of_drm_get_panel_orientation - look up the orientation of the panel through
358 	if (ret == -EINVAL) {  in of_drm_get_panel_orientation()
376 		return -EINVAL;  in of_drm_get_panel_orientation()
384  * drm_is_panel_follower() - Check if the device is a panel follower
401 	return of_property_read_bool(dev->of_node, "panel");  in drm_is_panel_follower()
406  * drm_panel_add_follower() - Register something to follow panel state.
421  * Return: 0 or an error code. Note that -ENODEV means that we detected that
432 	panel_np = of_parse_phandle(follower_dev->of_node, "panel", 0);  in drm_panel_add_follower()
434 		return -ENODEV;  in drm_panel_add_follower()
441 	get_device(panel->dev);  in drm_panel_add_follower()
442 	follower->panel = panel;  in drm_panel_add_follower()
444 	mutex_lock(&panel->follower_lock);  in drm_panel_add_follower()
446 	list_add_tail(&follower->list, &panel->followers);  in drm_panel_add_follower()
447 	if (panel->prepared) {  in drm_panel_add_follower()
448 		ret = follower->funcs->panel_prepared(follower);  in drm_panel_add_follower()
450 			dev_info(panel->dev, "%ps failed: %d\n",  in drm_panel_add_follower()
451 				 follower->funcs->panel_prepared, ret);  in drm_panel_add_follower()
454 	mutex_unlock(&panel->follower_lock);  in drm_panel_add_follower()
461  * drm_panel_remove_follower() - Reverse drm_panel_add_follower().
471 	struct drm_panel *panel = follower->panel;  in drm_panel_remove_follower()
474 	mutex_lock(&panel->follower_lock);  in drm_panel_remove_follower()
476 	if (panel->prepared) {  in drm_panel_remove_follower()
477 		ret = follower->funcs->panel_unpreparing(follower);  in drm_panel_remove_follower()
479 			dev_info(panel->dev, "%ps failed: %d\n",  in drm_panel_remove_follower()
480 				 follower->funcs->panel_unpreparing, ret);  in drm_panel_remove_follower()
482 	list_del_init(&follower->list);  in drm_panel_remove_follower()
484 	mutex_unlock(&panel->follower_lock);  in drm_panel_remove_follower()
486 	put_device(panel->dev);  in drm_panel_remove_follower()
496  * devm_drm_panel_add_follower() - devm version of drm_panel_add_follower()
520  * drm_panel_of_backlight - use backlight device node for backlight
543 	if (!panel || !panel->dev)  in drm_panel_of_backlight()
544 		return -EINVAL;  in drm_panel_of_backlight()
546 	backlight = devm_of_find_backlight(panel->dev);  in drm_panel_of_backlight()
551 	panel->backlight = backlight;  in drm_panel_of_backlight()