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 | |