106 lines
3.1 KiB
C
106 lines
3.1 KiB
C
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/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>
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*
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* description of display timings
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*/
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#ifndef __LINUX_DISPLAY_TIMING_H
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#define __LINUX_DISPLAY_TIMING_H
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#include <linux/bitops.h>
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#include <linux/types.h>
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enum display_flags {
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DISPLAY_FLAGS_HSYNC_LOW = BIT(0),
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DISPLAY_FLAGS_HSYNC_HIGH = BIT(1),
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DISPLAY_FLAGS_VSYNC_LOW = BIT(2),
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DISPLAY_FLAGS_VSYNC_HIGH = BIT(3),
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/* data enable flag */
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DISPLAY_FLAGS_DE_LOW = BIT(4),
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DISPLAY_FLAGS_DE_HIGH = BIT(5),
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/* drive data on pos. edge */
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DISPLAY_FLAGS_PIXDATA_POSEDGE = BIT(6),
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/* drive data on neg. edge */
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DISPLAY_FLAGS_PIXDATA_NEGEDGE = BIT(7),
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DISPLAY_FLAGS_INTERLACED = BIT(8),
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DISPLAY_FLAGS_DOUBLESCAN = BIT(9),
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DISPLAY_FLAGS_DOUBLECLK = BIT(10),
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/* drive sync on pos. edge */
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DISPLAY_FLAGS_SYNC_POSEDGE = BIT(11),
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/* drive sync on neg. edge */
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DISPLAY_FLAGS_SYNC_NEGEDGE = BIT(12),
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};
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/*
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* A single signal can be specified via a range of minimal and maximal values
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* with a typical value, that lies somewhere inbetween.
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*/
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struct timing_entry {
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u32 min;
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u32 typ;
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u32 max;
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};
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/*
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* Single "mode" entry. This describes one set of signal timings a display can
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* have in one setting. This struct can later be converted to struct videomode
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* (see include/video/videomode.h). As each timing_entry can be defined as a
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* range, one struct display_timing may become multiple struct videomodes.
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*
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* Example: hsync active high, vsync active low
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*
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* Active Video
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* Video ______________________XXXXXXXXXXXXXXXXXXXXXX_____________________
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* |<- sync ->|<- back ->|<----- active ----->|<- front ->|<- sync..
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* | | porch | | porch |
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*
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* HSync _|¯¯¯¯¯¯¯¯¯¯|___________________________________________|¯¯¯¯¯¯¯¯¯
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*
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* VSync ¯|__________|¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯|_________
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*/
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struct display_timing {
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struct timing_entry pixelclock;
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struct timing_entry hactive; /* hor. active video */
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struct timing_entry hfront_porch; /* hor. front porch */
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struct timing_entry hback_porch; /* hor. back porch */
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struct timing_entry hsync_len; /* hor. sync len */
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struct timing_entry vactive; /* ver. active video */
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struct timing_entry vfront_porch; /* ver. front porch */
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struct timing_entry vback_porch; /* ver. back porch */
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struct timing_entry vsync_len; /* ver. sync len */
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enum display_flags flags; /* display flags */
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};
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/*
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* This describes all timing settings a display provides.
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* The native_mode is the default setting for this display.
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* Drivers that can handle multiple videomodes should work with this struct and
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* convert each entry to the desired end result.
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*/
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struct display_timings {
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unsigned int num_timings;
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unsigned int native_mode;
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struct display_timing **timings;
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};
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/* get one entry from struct display_timings */
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static inline struct display_timing *display_timings_get(const struct
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display_timings *disp,
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unsigned int index)
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{
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if (disp->num_timings > index)
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return disp->timings[index];
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else
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return NULL;
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}
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void display_timings_release(struct display_timings *disp);
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#endif
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