107 строки
3.1 KiB
C
107 строки
3.1 KiB
C
/*
|
|
* Copyright 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>
|
|
*
|
|
* description of display timings
|
|
*
|
|
* This file is released under the GPLv2
|
|
*/
|
|
|
|
#ifndef __LINUX_DISPLAY_TIMING_H
|
|
#define __LINUX_DISPLAY_TIMING_H
|
|
|
|
#include <linux/bitops.h>
|
|
#include <linux/types.h>
|
|
|
|
enum display_flags {
|
|
DISPLAY_FLAGS_HSYNC_LOW = BIT(0),
|
|
DISPLAY_FLAGS_HSYNC_HIGH = BIT(1),
|
|
DISPLAY_FLAGS_VSYNC_LOW = BIT(2),
|
|
DISPLAY_FLAGS_VSYNC_HIGH = BIT(3),
|
|
|
|
/* data enable flag */
|
|
DISPLAY_FLAGS_DE_LOW = BIT(4),
|
|
DISPLAY_FLAGS_DE_HIGH = BIT(5),
|
|
/* drive data on pos. edge */
|
|
DISPLAY_FLAGS_PIXDATA_POSEDGE = BIT(6),
|
|
/* drive data on neg. edge */
|
|
DISPLAY_FLAGS_PIXDATA_NEGEDGE = BIT(7),
|
|
DISPLAY_FLAGS_INTERLACED = BIT(8),
|
|
DISPLAY_FLAGS_DOUBLESCAN = BIT(9),
|
|
DISPLAY_FLAGS_DOUBLECLK = BIT(10),
|
|
/* drive sync on pos. edge */
|
|
DISPLAY_FLAGS_SYNC_POSEDGE = BIT(11),
|
|
/* drive sync on neg. edge */
|
|
DISPLAY_FLAGS_SYNC_NEGEDGE = BIT(12),
|
|
};
|
|
|
|
/*
|
|
* 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 {
|
|
u32 min;
|
|
u32 typ;
|
|
u32 max;
|
|
};
|
|
|
|
/*
|
|
* 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 {
|
|
struct timing_entry pixelclock;
|
|
|
|
struct timing_entry hactive; /* hor. active video */
|
|
struct timing_entry hfront_porch; /* hor. front porch */
|
|
struct timing_entry hback_porch; /* hor. back porch */
|
|
struct timing_entry hsync_len; /* hor. sync len */
|
|
|
|
struct timing_entry vactive; /* ver. active video */
|
|
struct timing_entry vfront_porch; /* ver. front porch */
|
|
struct timing_entry vback_porch; /* ver. back porch */
|
|
struct timing_entry vsync_len; /* ver. sync len */
|
|
|
|
enum display_flags flags; /* display flags */
|
|
};
|
|
|
|
/*
|
|
* 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 {
|
|
unsigned int num_timings;
|
|
unsigned int native_mode;
|
|
|
|
struct display_timing **timings;
|
|
};
|
|
|
|
/* get one entry from struct display_timings */
|
|
static inline struct display_timing *display_timings_get(const struct
|
|
display_timings *disp,
|
|
unsigned int index)
|
|
{
|
|
if (disp->num_timings > index)
|
|
return disp->timings[index];
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
void display_timings_release(struct display_timings *disp);
|
|
|
|
#endif
|