1*6594783dSgdamore /* $NetBSD: vesagtf.h,v 1.1 2006/05/11 01:49:53 gdamore Exp $ */ 2*6594783dSgdamore 3*6594783dSgdamore /*- 4*6594783dSgdamore * Copyright (c) 2006 Itronix Inc. 5*6594783dSgdamore * All rights reserved. 6*6594783dSgdamore * 7*6594783dSgdamore * Written by Garrett D'Amore for Itronix Inc. 8*6594783dSgdamore * 9*6594783dSgdamore * Redistribution and use in source and binary forms, with or without 10*6594783dSgdamore * modification, are permitted provided that the following conditions 11*6594783dSgdamore * are met: 12*6594783dSgdamore * 1. Redistributions of source code must retain the above copyright 13*6594783dSgdamore * notice, this list of conditions and the following disclaimer. 14*6594783dSgdamore * 2. Redistributions in binary form must reproduce the above copyright 15*6594783dSgdamore * notice, this list of conditions and the following disclaimer in the 16*6594783dSgdamore * documentation and/or other materials provided with the distribution. 17*6594783dSgdamore * 3. The name of Itronix Inc. may not be used to endorse 18*6594783dSgdamore * or promote products derived from this software without specific 19*6594783dSgdamore * prior written permission. 20*6594783dSgdamore * 21*6594783dSgdamore * THIS SOFTWARE IS PROVIDED BY ITRONIX INC. ``AS IS'' AND ANY EXPRESS 22*6594783dSgdamore * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 23*6594783dSgdamore * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24*6594783dSgdamore * ARE DISCLAIMED. IN NO EVENT SHALL ITRONIX INC. BE LIABLE FOR ANY 25*6594783dSgdamore * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26*6594783dSgdamore * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 27*6594783dSgdamore * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28*6594783dSgdamore * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 29*6594783dSgdamore * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 30*6594783dSgdamore * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 31*6594783dSgdamore * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32*6594783dSgdamore */ 33*6594783dSgdamore 34*6594783dSgdamore #ifndef _DEV_VIDEOMODE_VESAGTF_H 35*6594783dSgdamore #define _DEV_VIDEOMODE_VESAGTF_H 36*6594783dSgdamore 37*6594783dSgdamore /* 38*6594783dSgdamore * Use VESA GTF formula to generate a monitor mode, given resolution and 39*6594783dSgdamore * refresh rates. 40*6594783dSgdamore */ 41*6594783dSgdamore 42*6594783dSgdamore struct vesagtf_params { 43*6594783dSgdamore unsigned margin_ppt; /* vertical margin size, percent * 10 44*6594783dSgdamore * think parts-per-thousand */ 45*6594783dSgdamore unsigned min_porch; /* minimum front porch */ 46*6594783dSgdamore unsigned vsync_rqd; /* width of vsync in lines */ 47*6594783dSgdamore unsigned hsync_pct; /* hsync as % of total width */ 48*6594783dSgdamore unsigned min_vsbp; /* minimum vsync + back porch (usec) */ 49*6594783dSgdamore unsigned M; /* blanking formula gradient */ 50*6594783dSgdamore unsigned C; /* blanking formula offset */ 51*6594783dSgdamore unsigned K; /* blanking formula scaling factor */ 52*6594783dSgdamore unsigned J; /* blanking formula scaling factor */ 53*6594783dSgdamore }; 54*6594783dSgdamore 55*6594783dSgdamore /* 56*6594783dSgdamore * Default values to use for params. 57*6594783dSgdamore */ 58*6594783dSgdamore #define VESAGTF_MARGIN_PPT 18 /* 1.8% */ 59*6594783dSgdamore #define VESAGTF_MIN_PORCH 1 /* minimum front porch */ 60*6594783dSgdamore #define VESAGTF_VSYNC_RQD 3 /* vsync width in lines */ 61*6594783dSgdamore #define VESAGTF_HSYNC_PCT 8 /* width of hsync % of total line */ 62*6594783dSgdamore #define VESAGTF_MIN_VSBP 550 /* min vsync + back porch (usec) */ 63*6594783dSgdamore #define VESAGTF_M 600 /* blanking formula gradient */ 64*6594783dSgdamore #define VESAGTF_C 40 /* blanking formula offset */ 65*6594783dSgdamore #define VESAGTF_K 128 /* blanking formula scaling factor */ 66*6594783dSgdamore #define VESAGTF_J 20 /* blanking formula scaling factor */ 67*6594783dSgdamore 68*6594783dSgdamore /* 69*6594783dSgdamore * Use VESA GTF formula to generate monitor timings. Assumes default 70*6594783dSgdamore * GTF parameters, non-interlaced, and no margins. 71*6594783dSgdamore */ 72*6594783dSgdamore void vesagtf_mode(unsigned x, unsigned y, unsigned refresh, 73*6594783dSgdamore struct videomode *); 74*6594783dSgdamore 75*6594783dSgdamore /* 76*6594783dSgdamore * A more complete version, in case we ever want to use alternate GTF 77*6594783dSgdamore * parameters. EDID 1.3 allows for "secondary GTF parameters". 78*6594783dSgdamore */ 79*6594783dSgdamore void vesagtf_mode_params(unsigned x, unsigned y, unsigned refresh, 80*6594783dSgdamore struct vesagtf_params *, int flags, struct videomode *); 81*6594783dSgdamore 82*6594783dSgdamore #define VESAGTF_FLAG_ILACE 0x0001 /* use interlace */ 83*6594783dSgdamore #define VESAGTF_FLAG_MARGINS 0x0002 /* use margins */ 84*6594783dSgdamore 85*6594783dSgdamore #endif /* _DEV_VIDEOMODE_VESAGTF_H */ 86