1 /* $NetBSD$ */ 2 /* $FreeBSD$ */ 3 4 /*- 5 * Copyright (c) 2006 Itronix Inc. 6 * All rights reserved. 7 * 8 * Written by Garrett D'Amore for Itronix Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. The name of Itronix Inc. may not be used to endorse 19 * or promote products derived from this software without specific 20 * prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY ITRONIX INC. ``AS IS'' AND ANY EXPRESS 23 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 24 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL ITRONIX INC. BE LIABLE FOR ANY 26 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 28 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 30 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 31 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 32 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 #ifndef _DEV_VIDEOMODE_VESAGTF_H 36 #define _DEV_VIDEOMODE_VESAGTF_H 37 38 /* 39 * Use VESA GTF formula to generate a monitor mode, given resolution and 40 * refresh rates. 41 */ 42 43 struct vesagtf_params { 44 unsigned margin_ppt; /* vertical margin size, percent * 10 45 * think parts-per-thousand */ 46 unsigned min_porch; /* minimum front porch */ 47 unsigned vsync_rqd; /* width of vsync in lines */ 48 unsigned hsync_pct; /* hsync as % of total width */ 49 unsigned min_vsbp; /* minimum vsync + back porch (usec) */ 50 unsigned M; /* blanking formula gradient */ 51 unsigned C; /* blanking formula offset */ 52 unsigned K; /* blanking formula scaling factor */ 53 unsigned J; /* blanking formula scaling factor */ 54 }; 55 56 /* 57 * Default values to use for params. 58 */ 59 #define VESAGTF_MARGIN_PPT 18 /* 1.8% */ 60 #define VESAGTF_MIN_PORCH 1 /* minimum front porch */ 61 #define VESAGTF_VSYNC_RQD 3 /* vsync width in lines */ 62 #define VESAGTF_HSYNC_PCT 8 /* width of hsync % of total line */ 63 #define VESAGTF_MIN_VSBP 550 /* min vsync + back porch (usec) */ 64 #define VESAGTF_M 600 /* blanking formula gradient */ 65 #define VESAGTF_C 40 /* blanking formula offset */ 66 #define VESAGTF_K 128 /* blanking formula scaling factor */ 67 #define VESAGTF_J 20 /* blanking formula scaling factor */ 68 69 /* 70 * Use VESA GTF formula to generate monitor timings. Assumes default 71 * GTF parameters, non-interlaced, and no margins. 72 */ 73 void vesagtf_mode(unsigned x, unsigned y, unsigned refresh, 74 struct videomode *); 75 76 /* 77 * A more complete version, in case we ever want to use alternate GTF 78 * parameters. EDID 1.3 allows for "secondary GTF parameters". 79 */ 80 void vesagtf_mode_params(unsigned x, unsigned y, unsigned refresh, 81 struct vesagtf_params *, int flags, struct videomode *); 82 83 #define VESAGTF_FLAG_ILACE 0x0001 /* use interlace */ 84 #define VESAGTF_FLAG_MARGINS 0x0002 /* use margins */ 85 86 #endif /* _DEV_VIDEOMODE_VESAGTF_H */ 87