linux/include/video/display_timing.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright 2012 Steffen Trumtrar <[email protected]>
 *
 * description of display timings
 */

#ifndef __LINUX_DISPLAY_TIMING_H
#define __LINUX_DISPLAY_TIMING_H

#include <linux/bitops.h>
#include <linux/types.h>

enum display_flags { … };

/*
 * A single signal can be specified via a range of minimal and maximal values
 * with a typical value, that lies somewhere inbetween.
 */
struct timing_entry { … };

/*
 * Single "mode" entry. This describes one set of signal timings a display can
 * have in one setting. This struct can later be converted to struct videomode
 * (see include/video/videomode.h). As each timing_entry can be defined as a
 * range, one struct display_timing may become multiple struct videomodes.
 *
 * Example: hsync active high, vsync active low
 *
 *				    Active Video
 * Video  ______________________XXXXXXXXXXXXXXXXXXXXXX_____________________
 *	  |<- sync ->|<- back ->|<----- active ----->|<- front ->|<- sync..
 *	  |	     |	 porch  |		     |	 porch	 |
 *
 * HSync _|¯¯¯¯¯¯¯¯¯¯|___________________________________________|¯¯¯¯¯¯¯¯¯
 *
 * VSync ¯|__________|¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯|_________
 */
struct display_timing { … };

/*
 * This describes all timing settings a display provides.
 * The native_mode is the default setting for this display.
 * Drivers that can handle multiple videomodes should work with this struct and
 * convert each entry to the desired end result.
 */
struct display_timings { … };

/* get one entry from struct display_timings */
static inline struct display_timing *display_timings_get(const struct
							 display_timings *disp,
							 unsigned int index)
{ … }

void display_timings_release(struct display_timings *disp);

#endif