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kernel/linux-imx6_3.14.28/include/video/display_timing.h 2.98 KB
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  /*
   * 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),
  };
  
  /*
   * 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