0,0 → 1,102 |
/* |
* 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> |
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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), |
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/* 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), |
}; |
|
/* |
* 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; |
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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 */ |
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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; |
}; |
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/* 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; |
} |
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void display_timings_release(struct display_timings *disp); |
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#endif |