5 * Copyright (c) 2006 Itronix Inc.
8 * Written by Garrett D'Amore for Itronix Inc.
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11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
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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.
22 * THIS SOFTWARE IS PROVIDED BY ITRONIX INC. ``AS IS'' AND ANY EXPRESS
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35 #ifndef _DEV_VIDEOMODE_VESAGTF_H
36 #define _DEV_VIDEOMODE_VESAGTF_H
39 * Use VESA GTF formula to generate a monitor mode, given resolution and
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 */
57 * Default values to use for params.
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 */
70 * Use VESA GTF formula to generate monitor timings. Assumes default
71 * GTF parameters, non-interlaced, and no margins.
73 void vesagtf_mode(unsigned x, unsigned y, unsigned refresh,
77 * A more complete version, in case we ever want to use alternate GTF
78 * parameters. EDID 1.3 allows for "secondary GTF parameters".
80 void vesagtf_mode_params(unsigned x, unsigned y, unsigned refresh,
81 struct vesagtf_params *, int flags, struct videomode *);
83 #define VESAGTF_FLAG_ILACE 0x0001 /* use interlace */
84 #define VESAGTF_FLAG_MARGINS 0x0002 /* use margins */
86 #endif /* _DEV_VIDEOMODE_VESAGTF_H */