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Diffstat (limited to 'sys/dev/videomode/vesagtf.h')
| -rw-r--r-- | sys/dev/videomode/vesagtf.h | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/sys/dev/videomode/vesagtf.h b/sys/dev/videomode/vesagtf.h new file mode 100644 index 00000000000..885b685c8e0 --- /dev/null +++ b/sys/dev/videomode/vesagtf.h @@ -0,0 +1,85 @@ +/* $NetBSD: vesagtf.h,v 1.1 2006/05/11 01:49:53 gdamore Exp $ */ + +/*- + * Copyright (c) 2006 Itronix Inc. + * All rights reserved. + * + * Written by Garrett D'Amore for Itronix Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of Itronix Inc. may not be used to endorse + * or promote products derived from this software without specific + * prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY ITRONIX INC. ``AS IS'' AND ANY EXPRESS + * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL ITRONIX INC. BE LIABLE FOR ANY + * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE + * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, + * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef _DEV_VIDEOMODE_VESAGTF_H +#define _DEV_VIDEOMODE_VESAGTF_H + +/* + * Use VESA GTF formula to generate a monitor mode, given resolution and + * refresh rates. + */ + +struct vesagtf_params { + unsigned margin_ppt; /* vertical margin size, percent * 10 + * think parts-per-thousand */ + unsigned min_porch; /* minimum front porch */ + unsigned vsync_rqd; /* width of vsync in lines */ + unsigned hsync_pct; /* hsync as % of total width */ + unsigned min_vsbp; /* minimum vsync + back porch (usec) */ + unsigned M; /* blanking formula gradient */ + unsigned C; /* blanking formula offset */ + unsigned K; /* blanking formula scaling factor */ + unsigned J; /* blanking formula scaling factor */ +}; + +/* + * Default values to use for params. + */ +#define VESAGTF_MARGIN_PPT 18 /* 1.8% */ +#define VESAGTF_MIN_PORCH 1 /* minimum front porch */ +#define VESAGTF_VSYNC_RQD 3 /* vsync width in lines */ +#define VESAGTF_HSYNC_PCT 8 /* width of hsync % of total line */ +#define VESAGTF_MIN_VSBP 550 /* min vsync + back porch (usec) */ +#define VESAGTF_M 600 /* blanking formula gradient */ +#define VESAGTF_C 40 /* blanking formula offset */ +#define VESAGTF_K 128 /* blanking formula scaling factor */ +#define VESAGTF_J 20 /* blanking formula scaling factor */ + +/* + * Use VESA GTF formula to generate monitor timings. Assumes default + * GTF parameters, non-interlaced, and no margins. + */ +void vesagtf_mode(unsigned x, unsigned y, unsigned refresh, + struct videomode *); + +/* + * A more complete version, in case we ever want to use alternate GTF + * parameters. EDID 1.3 allows for "secondary GTF parameters". + */ +void vesagtf_mode_params(unsigned x, unsigned y, unsigned refresh, + struct vesagtf_params *, int flags, struct videomode *); + +#define VESAGTF_FLAG_ILACE 0x0001 /* use interlace */ +#define VESAGTF_FLAG_MARGINS 0x0002 /* use margins */ + +#endif /* _DEV_VIDEOMODE_VESAGTF_H */ |