linux/include/drm/drm_panel.h
Sam Ravnborg e0d409ff16 drm/panel: drop return code from drm_panel_detach()
There are no errors that can be reported by this function,
so drop the return code.
Fix the only bridge driver that checked the return result.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <maxime.ripard@bootlin.com>
Cc: Sean Paul <sean@poorly.run>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Cc: Andrzej Hajda <a.hajda@samsung.com>
Cc: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Walleij <linus.walleij@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190804201637.1240-14-sam@ravnborg.org
2019-08-10 15:41:48 +02:00

176 lines
4.9 KiB
C

/*
* Copyright (C) 2013, NVIDIA Corporation. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sub license,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#ifndef __DRM_PANEL_H__
#define __DRM_PANEL_H__
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/list.h>
struct device_node;
struct drm_connector;
struct drm_device;
struct drm_panel;
struct display_timing;
/**
* struct drm_panel_funcs - perform operations on a given panel
*
* The .prepare() function is typically called before the display controller
* starts to transmit video data. Panel drivers can use this to turn the panel
* on and wait for it to become ready. If additional configuration is required
* (via a control bus such as I2C, SPI or DSI for example) this is a good time
* to do that.
*
* After the display controller has started transmitting video data, it's safe
* to call the .enable() function. This will typically enable the backlight to
* make the image on screen visible. Some panels require a certain amount of
* time or frames before the image is displayed. This function is responsible
* for taking this into account before enabling the backlight to avoid visual
* glitches.
*
* Before stopping video transmission from the display controller it can be
* necessary to turn off the panel to avoid visual glitches. This is done in
* the .disable() function. Analogously to .enable() this typically involves
* turning off the backlight and waiting for some time to make sure no image
* is visible on the panel. It is then safe for the display controller to
* cease transmission of video data.
*
* To save power when no video data is transmitted, a driver can power down
* the panel. This is the job of the .unprepare() function.
*/
struct drm_panel_funcs {
/**
* @prepare:
*
* Turn on panel and perform set up.
*/
int (*prepare)(struct drm_panel *panel);
/**
* @enable:
*
* Enable panel (turn on back light, etc.).
*/
int (*enable)(struct drm_panel *panel);
/**
* @disable:
*
* Disable panel (turn off back light, etc.).
*/
int (*disable)(struct drm_panel *panel);
/**
* @unprepare:
*
* Turn off panel.
*/
int (*unprepare)(struct drm_panel *panel);
/**
* @get_modes:
*
* Add modes to the connector that the panel is attached to and
* return the number of modes added.
*/
int (*get_modes)(struct drm_panel *panel);
/**
* @get_timings:
*
* Copy display timings into the provided array and return
* the number of display timings available.
*/
int (*get_timings)(struct drm_panel *panel, unsigned int num_timings,
struct display_timing *timings);
};
/**
* struct drm_panel - DRM panel object
*/
struct drm_panel {
/**
* @drm:
*
* DRM device owning the panel.
*/
struct drm_device *drm;
/**
* @connector:
*
* DRM connector that the panel is attached to.
*/
struct drm_connector *connector;
/**
* @dev:
*
* Parent device of the panel.
*/
struct device *dev;
/**
* @funcs:
*
* Operations that can be performed on the panel.
*/
const struct drm_panel_funcs *funcs;
/**
* @list:
*
* Panel entry in registry.
*/
struct list_head list;
};
void drm_panel_init(struct drm_panel *panel);
int drm_panel_add(struct drm_panel *panel);
void drm_panel_remove(struct drm_panel *panel);
int drm_panel_attach(struct drm_panel *panel, struct drm_connector *connector);
void drm_panel_detach(struct drm_panel *panel);
int drm_panel_prepare(struct drm_panel *panel);
int drm_panel_unprepare(struct drm_panel *panel);
int drm_panel_enable(struct drm_panel *panel);
int drm_panel_disable(struct drm_panel *panel);
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);
#else
static inline struct drm_panel *of_drm_find_panel(const struct device_node *np)
{
return ERR_PTR(-ENODEV);
}
#endif
#endif