| 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 | |