FreeBSD/Linux Kernel Cross Reference
sys/dev/videomode/vesagtf.h

     /*      $NetBSD$        */
     /*      $FreeBSD$       */
     
     /*-
      * 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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