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