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/* $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 */
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