path: root/src/i830_tv.c

/*
 * Copyright © 2006 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * Authors:
 *    Eric Anholt <eric@anholt.net>
 *
 */

/** @file
 * Integrated TV-out support for the 915GM and 945GM.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "xf86.h"
#include "i830.h"
#include "i830_display.h"
#include <string.h>

enum tv_type {
    TV_TYPE_NONE,
    TV_TYPE_UNKNOWN,
    TV_TYPE_COMPOSITE,
    TV_TYPE_SVIDEO,
    TV_TYPE_COMPONENT
};

/** Private structure for the integrated TV support */
struct i830_tv_priv {
    int type;
    CARD32 save_TV_H_CTL_1;
    CARD32 save_TV_H_CTL_2;
    CARD32 save_TV_H_CTL_3;
    CARD32 save_TV_V_CTL_1;
    CARD32 save_TV_V_CTL_2;
    CARD32 save_TV_V_CTL_3;
    CARD32 save_TV_V_CTL_4;
    CARD32 save_TV_V_CTL_5;
    CARD32 save_TV_V_CTL_6;
    CARD32 save_TV_V_CTL_7;
    CARD32 save_TV_SC_CTL_1, save_TV_SC_CTL_2, save_TV_SC_CTL_3;

    CARD32 save_TV_CSC_Y;
    CARD32 save_TV_CSC_Y2;
    CARD32 save_TV_CSC_U;
    CARD32 save_TV_CSC_U2;
    CARD32 save_TV_CSC_V;
    CARD32 save_TV_CSC_V2;
    CARD32 save_TV_CLR_KNOBS;
    CARD32 save_TV_CLR_LEVEL;
    CARD32 save_TV_WIN_POS;
    CARD32 save_TV_WIN_SIZE;
    CARD32 save_TV_FILTER_CTL_1;
    CARD32 save_TV_FILTER_CTL_2;
    CARD32 save_TV_FILTER_CTL_3;

    CARD32 save_TV_H_LUMA[60];
    CARD32 save_TV_H_CHROMA[60];
    CARD32 save_TV_V_LUMA[43];
    CARD32 save_TV_V_CHROMA[43];

    CARD32 save_TV_DAC;
    CARD32 save_TV_CTL;
};

typedef struct {
    int	blank, black, burst;
} video_levels_t;

typedef struct {
    float   ry, gy, by, ay;
    float   ru, gu, bu, au;
    float   rv, gv, bv, av;
} color_conversion_t;

typedef struct {
    char *name;
    CARD32 oversample;
    int hsync_end, hblank_start, hblank_end, htotal;
    Bool progressive;
    int vsync_start_f1, vsync_start_f2, vsync_len;
    Bool veq_ena;
    int veq_start_f1, veq_start_f2, veq_len;
    int vi_end_f1, vi_end_f2, nbr_end;
    Bool burst_ena;
    int hburst_start, hburst_len;
    int vburst_start_f1, vburst_end_f1;
    int vburst_start_f2, vburst_end_f2;
    int vburst_start_f3, vburst_end_f3;
    int vburst_start_f4, vburst_end_f4;
    /*
     * subcarrier programming
     */
    int dda2_size, dda3_size, dda1_inc, dda2_inc, dda3_inc;
    CARD32 sc_reset;
    Bool pal_burst;
    /*
     * blank/black levels
     */
    video_levels_t	composite_levels, svideo_levels;
    color_conversion_t	composite_color, svideo_color;
} tv_mode_t;

#define TV_PLL_CLOCK	107520

/*
 * Sub carrier DDA
 *
 *  I think this works as follows:
 *
 *  subcarrier freq = pixel_clock * (dda1_inc + dda2_inc / dda2_size) / 4096
 *
 * Presumably, when dda3 is added in, it gets to adjust the dda2_inc value
 *
 * So,
 *  dda1_ideal = subcarrier/pixel * 4096
 *  dda1_inc = floor (dda1_ideal)
 *  dda2 = dda1_ideal - dda1_inc
 *
 *  then pick a ratio for dda2 that gives the closest approximation. If
 *  you can't get close enough, you can play with dda3 as well. This
 *  seems likely to happen when dda2 is small as the jumps would be larger
 *
 * To invert this,
 *
 *  pixel_clock = subcarrier * 4096 / (dda1_inc + dda2_inc / dda2_size)
 *
 * The constants below were all computed using a 107.520MHz clock
 */
 
/**
 * Register programming values for TV modes.
 *
 * These values account for -1s required.
 */

const static tv_mode_t tv_modes[] = {
    {
	.name		= "NTSC 480i",
	.oversample	= TV_OVERSAMPLE_8X,
	
	/* 525 Lines, 60 Fields, 15.734KHz line, Sub-Carrier 3.580MHz */

	.hsync_end	= 64,		    .hblank_end		= 124,
	.hblank_start	= 836,		    .htotal		= 857,
	
	.progressive	= FALSE,
	
	.vsync_start_f1	= 6,		    .vsync_start_f2	= 7,
	.vsync_len	= 6,
	
	.veq_ena	= TRUE,		    .veq_start_f1    	= 0,
	.veq_start_f2	= 1,		    .veq_len		= 18,
	
	.vi_end_f1	= 20,		    .vi_end_f2		= 21,
	.nbr_end	= 240,
	
	.burst_ena	= TRUE,
	.hburst_start	= 72,		    .hburst_len		= 34,
	.vburst_start_f1 = 9,		    .vburst_end_f1	= 240,
	.vburst_start_f2 = 10,		    .vburst_end_f2	= 240,
	.vburst_start_f3 = 9,		    .vburst_end_f3	= 240, 
	.vburst_start_f4 = 10,		    .vburst_end_f4	= 240,

	/* desired 3.5800000 actual 3.5800000 clock 107.52 */
	.dda1_inc	=    136,
	.dda2_inc	=   7624,	    .dda2_size		=  20013,
	.dda3_inc	=      0,	    .dda3_size		=      0,
	.sc_reset	= TV_SC_RESET_EVERY_4,
	.pal_burst	= FALSE,

	.composite_levels = { .blank = 225, .black = 267, .burst = 113 },
	.composite_color = {
	    .ry = 0.2990, .gy = 0.5870, .by = 0.1140, .ay = 0.5082,
	    .ru =-0.0749, .gu =-0.1471, .bu = 0.2220, .au = 1.0000,
	    .rv = 0.3125, .gv =-0.2616, .bv =-0.0508, .av = 1.0000,
	},

	.svideo_levels    = { .blank = 266, .black = 316, .burst = 133 },
	.svideo_color = {
	    .ry = 0.2990, .gy = 0.5870, .by = 0.1140, .ay = 0.6006,
	    .ru =-0.0885, .gu =-0.1738, .bu = 0.2624, .au = 1.0000,
	    .rv = 0.3693, .gv =-0.3092, .bv =-0.0601, .av = 1.0000,
	},
    },
    {
	.name		= "NTSC-Japan 480i",
	.oversample	= TV_OVERSAMPLE_8X,
	
	/* 525 Lines, 60 Fields, 15.734KHz line, Sub-Carrier 3.580MHz */
	.hsync_end	= 64,		    .hblank_end		= 124,
	.hblank_start	= 836,		    .htotal		= 857,
	
	.progressive	= FALSE,
	
	.vsync_start_f1	= 6,		    .vsync_start_f2	= 7,
	.vsync_len	= 6,
	
	.veq_ena	= TRUE,		    .veq_start_f1    	= 0,
	.veq_start_f2	= 1,		    .veq_len		= 18,
	
	.vi_end_f1	= 20,		    .vi_end_f2		= 21,
	.nbr_end	= 240,
	
	.burst_ena	= TRUE,
	.hburst_start	= 72,		    .hburst_len		= 34,
	.vburst_start_f1 = 9,		    .vburst_end_f1	= 240,
	.vburst_start_f2 = 10,		    .vburst_end_f2	= 240,
	.vburst_start_f3 = 9,		    .vburst_end_f3	= 240, 
	.vburst_start_f4 = 10,		    .vburst_end_f4	= 240,

	/* desired 3.5800000 actual 3.5800000 clock 107.52 */
	.dda1_inc	=    136,
	.dda2_inc	=   7624,	    .dda2_size		=  20013,
	.dda3_inc	=      0,	    .dda3_size		=      0,
	.sc_reset	= TV_SC_RESET_EVERY_4,
	.pal_burst	= FALSE,

	.composite_levels = { .blank = 225, .black = 225, .burst = 113 },
	.composite_color = {
	    .ry = 0.2990, .gy = 0.5870, .by = 0.1140, .ay = 0.5495,
	    .ru =-0.0810, .gu =-0.1590, .bu = 0.2400, .au = 1.0000,
	    .rv = 0.3378, .gv =-0.2829, .bv =-0.0549, .av = 1.0000,
	},

	.svideo_levels    = { .blank = 266, .black = 266, .burst = 133 },
	.svideo_color = {
	    .ry = 0.2990, .gy = 0.5870, .by = 0.1140, .ay = 0.6494,
	    .ru =-0.0957, .gu =-0.1879, .bu = 0.2836, .au = 1.0000,
	    .rv = 0.3992, .gv =-0.3343, .bv =-0.0649, .av = 1.0000,
	},
    },
    {
	/* 625 Lines, 50 Fields, 15.625KHz line, Sub-Carrier 4.434MHz */
	.name	    = "PAL 576i",
	.oversample	= TV_OVERSAMPLE_8X,

	.hsync_end	= 64,		    .hblank_end		= 128,
	.hblank_start	= 844,		    .htotal		= 863,
	
	.progressive	= FALSE,
	
	.vsync_start_f1	= 6,		    .vsync_start_f2	= 7,
	.vsync_len	= 6,
	
	.veq_ena	= TRUE,		    .veq_start_f1    	= 0,
	.veq_start_f2	= 1,		    .veq_len		= 18,

	.vi_end_f1	= 24,		    .vi_end_f2		= 25,
	.nbr_end	= 286,

	.burst_ena	= TRUE,
	.hburst_start	= 73,		    .hburst_len		= 34,
	.vburst_start_f1 = 8,		    .vburst_end_f1	= 285,
	.vburst_start_f2 = 8,		    .vburst_end_f2	= 286,
	.vburst_start_f3 = 9,		    .vburst_end_f3	= 286, 
	.vburst_start_f4 = 9,		    .vburst_end_f4	= 285,

	/* desired 4.4336180 actual 4.4336180 clock 107.52 */
	.dda1_inc	=    168,
	.dda2_inc	=  18557,	.dda2_size	=  20625,
	.dda3_inc	=      0,	.dda3_size	=      0,
	.sc_reset   = TV_SC_RESET_EVERY_8,
	.pal_burst  = TRUE,
	
	.composite_levels = { .blank = 237, .black = 237, .burst = 118 },
	.composite_color = {
	    .ry = 0.2990, .gy = 0.5870, .by = 0.1140, .ay = 0.5379,
	    .ru =-0.0793, .gu =-0.1557, .bu = 0.2350, .au = 1.0000,
	    .rv = 0.3307, .gv =-0.2769, .bv =-0.0538, .av = 1.0000,
	},

	.svideo_levels    = { .blank = 280, .black = 280, .burst = 139 },
	.svideo_color = {
	    .ry = 0.2990, .gy = 0.5870, .by = 0.1140, .ay = 0.6357,
	    .ru =-0.0937, .gu =-0.1840, .bu = 0.2777, .au = 1.0000,
	    .rv = 0.3908, .gv =-0.3273, .bv =-0.0636, .av = 1.0000,
	},
    }
#if 0
    {
	/* 625 Lines, 50 Fields, 15.625KHz line, Sub-Carrier 4.434MHz */
	.name	    = "PAL",
	/* desired 4.4336180 actual 4.4336180 clock 107.52 */
	.dda1_inc	=    168,
	.dda2_inc	=  18557,	.dda2_size	=  20625,
	.dda3_inc	=      0,	.dda3_size	=      0,
	.sc_reset   = TV_SC_RESET_EVERY_8,
	.pal_burst  = TRUE
	
	.composite_levels = { .blank = 237, .black = 237, .burst = 118 },
	.composite_color = {
	    .ry = 0.2990, .gy = 0.5870, .by = 0.1140, .ay = 0.5379,
	    .ru =-0.0793, .gu =-0.1557, .bu = 0.2350, .au = 1.0000,
	    .rv = 0.3307, .gv =-0.2769, .bv =-0.0538, .av = 1.0000,
	},

	.svideo_levels    = { .blank = 280, .black = 280, .burst = 139 },
	.svideo_color = {
	    .ry = 0.2990, .gy = 0.5870, .by = 0.1140, .ay = 0.6357,
	    .ru =-0.0937, .gu =-0.1840, .bu = 0.2777, .au = 1.0000,
	    .rv = 0.3908, .gv =-0.3273, .bv =-0.0636, .av = 1.0000,
	},
    },
    {
	/* 525 Lines, 60 Fields, 15.734KHz line, Sub-Carrier 3.576MHz */
	.name	    = "PAL M",
	/* desired 3.5756110 actual 3.5756110 clock 107.52 */
	.dda1_inc	=    136,
	.dda2_inc	=   5611,	.dda2_size	=  26250,
	.dda3_inc	=      0,	.dda3_size	=      0,
	.sc_reset   = TV_SC_RESET_EVERY_8,
	.pal_burst  = TRUE
	
	.composite_levels = { .blank = 225, .black = 267, .burst = 113 },
	.composite_color = {
	    .ry = 0.2990, .gy = 0.5870, .by = 0.1140, .ay = 0.5082,
	    .ru =-0.0749, .gu =-0.1471, .bu = 0.2220, .au = 1.0000,
	    .rv = 0.3125, .gv =-0.2616, .bv =-0.0508, .av = 1.0000,
	},

	.svideo_levels    = { .blank = 266, .black = 316, .burst = 133 },
	.svideo_color = {
	    .ry = 0.2990, .gy = 0.5870, .by = 0.1140, .ay = 0.6006,
	    .ru =-0.0885, .gu =-0.1738, .bu = 0.2624, .au = 1.0000,
	    .rv = 0.3693, .gv =-0.3092, .bv =-0.0601, .av = 1.0000,
	},
    },
    {
	/* 625 Lines, 50 Fields, 15.625KHz line, Sub-Carrier 3.582MHz */
	.name	    = "PAL Nc",
	/* desired 3.5820560 actual 3.5820560 clock 107.52 */
	.dda1_inc	=    136,
	.dda2_inc	=  12056,	.dda2_size	=  26250,
	.dda3_inc	=      0,	.dda3_size	=      0,
	.sc_reset   = TV_SC_RESET_EVERY_8,
	.pal_burst  = TRUE
	
	.composite_levels = { .blank = 225, .black = 267, .burst = 113 },
	.composite_color = {
	    .ry = 0.2990, .gy = 0.5870, .by = 0.1140, .ay = 0.5082,
	    .ru =-0.0749, .gu =-0.1471, .bu = 0.2220, .au = 1.0000,
	    .rv = 0.3125, .gv =-0.2616, .bv =-0.0508, .av = 1.0000,
	},

	.svideo_levels    = { .blank = 266, .black = 316, .burst = 133 },
	.svideo_color = {
	    .ry = 0.2990, .gy = 0.5870, .by = 0.1140, .ay = 0.6006,
	    .ru =-0.0885, .gu =-0.1738, .bu = 0.2624, .au = 1.0000,
	    .rv = 0.3693, .gv =-0.3092, .bv =-0.0601, .av = 1.0000,
	},
    },
    {
	/* 525 lines, 60 fields, 15.734KHz line, Sub-Carrier 4.43MHz */
	.name	    = "NTSC-4.43(nonstandard)",
	/* desired 4.4336180 actual 4.4336180 clock 107.52 */
	.dda1_inc	=    168,
	.dda2_inc	=  18557,	.dda2_size	=  20625,
	.dda3_inc	=      0,	.dda3_size	=      0,
	.sc_reset   = TV_SC_RESET_NEVER,
	.pal_burst  = FALSE

	.composite_levels = { .blank = 225, .black = 267, .burst = 113 },
	.composite_color = {
	    .ry = 0.2990, .gy = 0.5870, .by = 0.1140, .ay = 0.5082,
	    .ru =-0.0749, .gu =-0.1471, .bu = 0.2220, .au = 1.0000,
	    .rv = 0.3125, .gv =-0.2616, .bv =-0.0508, .av = 1.0000,
	},

	.svideo_levels    = { .blank = 266, .black = 316, .burst = 133 },
	.svideo_color = {
	    .ry = 0.2990, .gy = 0.5870, .by = 0.1140, .ay = 0.6006,
	    .ru =-0.0885, .gu =-0.1738, .bu = 0.2624, .au = 1.0000,
	    .rv = 0.3693, .gv =-0.3092, .bv =-0.0601, .av = 1.0000,
	},
    },
#endif
};

static const video_levels_t component_level = {
    .blank = 279, .black = 279 
};

static const color_conversion_t sdtv_component_color = {
    .ry = 0.2990, .gy = 0.5870, .by = 0.1140, .ay = 0.6364,
    .ru =-0.1687, .gu =-0.3313, .bu = 0.5000, .au = 1.0000,
    .rv = 0.5000, .gv =-0.4187, .bv =-0.0813, .av = 1.0000,
};
    
static const color_conversion_t hdtv_component_color = {
    .ry = 0.2126, .gy = 0.7152, .by = 0.0722, .ay = 0.6364,
    .ru =-0.1146, .gu =-0.3854, .bu = 0.5000, .au = 1.0000,
    .rv = 0.5000, .gv =-0.4542, .bv =-0.0458, .av = 1.0000,
};
    
static void
i830_tv_dpms(xf86OutputPtr output, int mode)
{
    ScrnInfoPtr pScrn = output->scrn;
    I830Ptr pI830 = I830PTR(pScrn);

    switch(mode) {
    case DPMSModeOn:
	OUTREG(TV_CTL, INREG(TV_CTL) | TV_ENC_ENABLE);
	break;
    case DPMSModeStandby:
    case DPMSModeSuspend:
    case DPMSModeOff:
	OUTREG(TV_CTL, INREG(TV_CTL) & ~TV_ENC_ENABLE);
	break;
    }
}

static void
i830_tv_save(xf86OutputPtr output)
{
    ScrnInfoPtr		    pScrn = output->scrn;
    I830Ptr		    pI830 = I830PTR(pScrn);
    I830OutputPrivatePtr    intel_output = output->driver_private;
    struct i830_tv_priv	    *dev_priv = intel_output->dev_priv;
    int			    i;

    dev_priv->save_TV_H_CTL_1 = INREG(TV_H_CTL_1);
    dev_priv->save_TV_H_CTL_2 = INREG(TV_H_CTL_2);
    dev_priv->save_TV_H_CTL_3 = INREG(TV_H_CTL_3);
    dev_priv->save_TV_V_CTL_1 = INREG(TV_V_CTL_1);
    dev_priv->save_TV_V_CTL_2 = INREG(TV_V_CTL_2);
    dev_priv->save_TV_V_CTL_3 = INREG(TV_V_CTL_3);
    dev_priv->save_TV_V_CTL_4 = INREG(TV_V_CTL_4);
    dev_priv->save_TV_V_CTL_5 = INREG(TV_V_CTL_5);
    dev_priv->save_TV_V_CTL_6 = INREG(TV_V_CTL_6);
    dev_priv->save_TV_V_CTL_7 = INREG(TV_V_CTL_7);
    dev_priv->save_TV_SC_CTL_1 = INREG(TV_SC_CTL_1);
    dev_priv->save_TV_SC_CTL_2 = INREG(TV_SC_CTL_2);
    dev_priv->save_TV_SC_CTL_3 = INREG(TV_SC_CTL_3);

    dev_priv->save_TV_CSC_Y = INREG(TV_CSC_Y);
    dev_priv->save_TV_CSC_Y2 = INREG(TV_CSC_Y2);
    dev_priv->save_TV_CSC_U = INREG(TV_CSC_U);
    dev_priv->save_TV_CSC_U2 = INREG(TV_CSC_U2);
    dev_priv->save_TV_CSC_V = INREG(TV_CSC_V);
    dev_priv->save_TV_CSC_V2 = INREG(TV_CSC_V2);
    dev_priv->save_TV_CLR_KNOBS = INREG(TV_CLR_KNOBS);
    dev_priv->save_TV_CLR_LEVEL = INREG(TV_CLR_LEVEL);
    dev_priv->save_TV_WIN_POS = INREG(TV_WIN_POS);
    dev_priv->save_TV_WIN_SIZE = INREG(TV_WIN_SIZE);
    dev_priv->save_TV_FILTER_CTL_1 = INREG(TV_FILTER_CTL_1);
    dev_priv->save_TV_FILTER_CTL_2 = INREG(TV_FILTER_CTL_2);
    dev_priv->save_TV_FILTER_CTL_3 = INREG(TV_FILTER_CTL_3);

    for (i = 0; i < 60; i++)
	dev_priv->save_TV_H_LUMA[i] = INREG(TV_H_LUMA_0 + (i <<2));
    for (i = 0; i < 60; i++)
	dev_priv->save_TV_H_CHROMA[i] = INREG(TV_H_CHROMA_0 + (i <<2));
    for (i = 0; i < 43; i++)
	dev_priv->save_TV_V_LUMA[i] = INREG(TV_V_LUMA_0 + (i <<2));
    for (i = 0; i < 43; i++)
	dev_priv->save_TV_V_CHROMA[i] = INREG(TV_V_CHROMA_0 + (i <<2));

    dev_priv->save_TV_DAC = INREG(TV_DAC);
    dev_priv->save_TV_CTL = INREG(TV_CTL);
}

static void
i830_tv_restore(xf86OutputPtr output)
{
    ScrnInfoPtr		    pScrn = output->scrn;
    I830Ptr		    pI830 = I830PTR(pScrn);
    I830OutputPrivatePtr    intel_output = output->driver_private;
    struct i830_tv_priv	    *dev_priv = intel_output->dev_priv;
    int			    i;

    OUTREG(TV_H_CTL_1, dev_priv->save_TV_H_CTL_1);
    OUTREG(TV_H_CTL_2, dev_priv->save_TV_H_CTL_2);
    OUTREG(TV_H_CTL_3, dev_priv->save_TV_H_CTL_3);
    OUTREG(TV_V_CTL_1, dev_priv->save_TV_V_CTL_1);
    OUTREG(TV_V_CTL_2, dev_priv->save_TV_V_CTL_2);
    OUTREG(TV_V_CTL_3, dev_priv->save_TV_V_CTL_3);
    OUTREG(TV_V_CTL_4, dev_priv->save_TV_V_CTL_4);
    OUTREG(TV_V_CTL_5, dev_priv->save_TV_V_CTL_5);
    OUTREG(TV_V_CTL_6, dev_priv->save_TV_V_CTL_6);
    OUTREG(TV_V_CTL_7, dev_priv->save_TV_V_CTL_7);
    OUTREG(TV_SC_CTL_1, dev_priv->save_TV_SC_CTL_1);
    OUTREG(TV_SC_CTL_2, dev_priv->save_TV_SC_CTL_2);
    OUTREG(TV_SC_CTL_3, dev_priv->save_TV_SC_CTL_3);

    OUTREG(TV_CSC_Y, dev_priv->save_TV_CSC_Y);
    OUTREG(TV_CSC_Y2, dev_priv->save_TV_CSC_Y2);
    OUTREG(TV_CSC_U, dev_priv->save_TV_CSC_U);
    OUTREG(TV_CSC_U2, dev_priv->save_TV_CSC_U2);
    OUTREG(TV_CSC_V, dev_priv->save_TV_CSC_V);
    OUTREG(TV_CSC_V2, dev_priv->save_TV_CSC_V2);
    OUTREG(TV_CLR_KNOBS, dev_priv->save_TV_CLR_KNOBS);
    OUTREG(TV_CLR_LEVEL, dev_priv->save_TV_CLR_LEVEL);
    OUTREG(TV_WIN_POS, dev_priv->save_TV_WIN_POS);
    OUTREG(TV_WIN_SIZE, dev_priv->save_TV_WIN_SIZE);
    OUTREG(TV_FILTER_CTL_1, dev_priv->save_TV_FILTER_CTL_1);
    OUTREG(TV_FILTER_CTL_2, dev_priv->save_TV_FILTER_CTL_2);
    OUTREG(TV_FILTER_CTL_3, dev_priv->save_TV_FILTER_CTL_3);

    for (i = 0; i < 60; i++)
	OUTREG(TV_H_LUMA_0 + (i <<2), dev_priv->save_TV_H_LUMA[i]);
    for (i = 0; i < 60; i++)
	OUTREG(TV_H_CHROMA_0 + (i <<2), dev_priv->save_TV_H_CHROMA[i]);
    for (i = 0; i < 43; i++)
	OUTREG(TV_V_LUMA_0 + (i <<2), dev_priv->save_TV_V_LUMA[i]);
    for (i = 0; i < 43; i++)
	OUTREG(TV_V_CHROMA_0 + (i <<2), dev_priv->save_TV_V_CHROMA[i]);

    OUTREG(TV_DAC, dev_priv->save_TV_DAC);
    OUTREG(TV_CTL, dev_priv->save_TV_CTL);
}

static int
i830_tv_mode_valid(xf86OutputPtr output, DisplayModePtr pMode)
{
    return MODE_OK;
}

static const CARD32 h_luma[60] = {
    0xB1403000, 0x2E203500, 0x35002E20, 0x3000B140,
    0x35A0B160, 0x2DC02E80, 0xB1403480, 0xB1603000,
    0x2EA03640, 0x34002D80, 0x3000B120, 0x36E0B160,
    0x2D202EF0, 0xB1203380, 0xB1603000, 0x2F303780,
    0x33002CC0, 0x3000B100, 0x3820B160, 0x2C802F50,
    0xB10032A0, 0xB1603000, 0x2F9038C0, 0x32202C20,
    0x3000B0E0, 0x3980B160, 0x2BC02FC0, 0xB0E031C0,
    0xB1603000, 0x2FF03A20, 0x31602B60, 0xB020B0C0,
    0x3AE0B160, 0x2B001810, 0xB0C03120, 0xB140B020,
    0x18283BA0, 0x30C02A80, 0xB020B0A0, 0x3C60B140,
    0x2A201838, 0xB0A03080, 0xB120B020, 0x18383D20,
    0x304029C0, 0xB040B080, 0x3DE0B100, 0x29601848,
    0xB0803000, 0xB100B040, 0x18483EC0, 0xB0402900,
    0xB040B060, 0x3F80B0C0, 0x28801858, 0xB060B080,
    0xB0A0B060, 0x18602820, 0xB0A02820, 0x0000B060,
};

static const CARD32 h_chroma[60] = {
    0xB1403000, 0x2E203500, 0x35002E20, 0x3000B140,
    0x35A0B160, 0x2DC02E80, 0xB1403480, 0xB1603000,
    0x2EA03640, 0x34002D80, 0x3000B120, 0x36E0B160,
    0x2D202EF0, 0xB1203380, 0xB1603000, 0x2F303780,
    0x33002CC0, 0x3000B100, 0x3820B160, 0x2C802F50,
    0xB10032A0, 0xB1603000, 0x2F9038C0, 0x32202C20,
    0x3000B0E0, 0x3980B160, 0x2BC02FC0, 0xB0E031C0,
    0xB1603000, 0x2FF03A20, 0x31602B60, 0xB020B0C0,
    0x3AE0B160, 0x2B001810, 0xB0C03120, 0xB140B020,
    0x18283BA0, 0x30C02A80, 0xB020B0A0, 0x3C60B140,
    0x2A201838, 0xB0A03080, 0xB120B020, 0x18383D20,
    0x304029C0, 0xB040B080, 0x3DE0B100, 0x29601848,
    0xB0803000, 0xB100B040, 0x18483EC0, 0xB0402900,
    0xB040B060, 0x3F80B0C0, 0x28801858, 0xB060B080,
    0xB0A0B060, 0x18602820, 0xB0A02820, 0x0000B060,
};

static const CARD32 v_luma[43] = {
    0x36403000, 0x2D002CC0, 0x30003640, 0x2D0036C0,
    0x35C02CC0, 0x37403000, 0x2C802D40, 0x30003540,
    0x2D8037C0, 0x34C02C40, 0x38403000, 0x2BC02E00,
    0x30003440, 0x2E2038C0, 0x34002B80, 0x39803000,
    0x2B402E40, 0x30003380, 0x2E603A00, 0x33402B00,
    0x3A803040, 0x2A802EA0, 0x30403300, 0x2EC03B40,
    0x32802A40, 0x3C003040, 0x2A002EC0, 0x30803240,
    0x2EC03C80, 0x320029C0, 0x3D403080, 0x29402F00,
    0x308031C0, 0x2F203DC0, 0x31802900, 0x3E8030C0,
    0x28802F40, 0x30C03140, 0x2F203F40, 0x31402840,
    0x28003100, 0x28002F00, 0x00003100,
};

static const CARD32 v_chroma[43] = {
    0x36403000, 0x2D002CC0, 0x30003640, 0x2D0036C0,
    0x35C02CC0, 0x37403000, 0x2C802D40, 0x30003540,
    0x2D8037C0, 0x34C02C40, 0x38403000, 0x2BC02E00,
    0x30003440, 0x2E2038C0, 0x34002B80, 0x39803000,
    0x2B402E40, 0x30003380, 0x2E603A00, 0x33402B00,
    0x3A803040, 0x2A802EA0, 0x30403300, 0x2EC03B40,
    0x32802A40, 0x3C003040, 0x2A002EC0, 0x30803240,
    0x2EC03C80, 0x320029C0, 0x3D403080, 0x29402F00,
    0x308031C0, 0x2F203DC0, 0x31802900, 0x3E8030C0,
    0x28802F40, 0x30C03140, 0x2F203F40, 0x31402840,
    0x28003100, 0x28002F00, 0x00003100,
};

static Bool
i830_tv_mode_fixup(xf86OutputPtr output, DisplayModePtr mode,
		 DisplayModePtr adjusted_mode)
{
    ScrnInfoPtr pScrn = output->scrn;
    xf86CrtcConfigPtr   xf86_config = XF86_CRTC_CONFIG_PTR(pScrn);
    int i;

    for (i = 0; i < xf86_config->num_output; i++) {
	xf86OutputPtr other_output = xf86_config->output[i];

	if (other_output != output && other_output->crtc == output->crtc) {
	    xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
		       "Can't enable TV and another output on the same "
		       "pipe\n");
	    return FALSE;
	}
    }

    /* XXX: fill me in */

    return TRUE;
}

static CARD32
i830_float_to_csc (float fin)
{
    CARD32  exp;
    CARD32  mant;
    CARD32  ret;
    float   f = fin;
    
    /* somehow the color conversion knows the signs of all the values */
    if (f < 0) f = -f;
    
    if (f >= 1)
    {
	exp = 0x7;
	mant = 1 << 8;
    }
    else
    {
	for (exp = 0; exp < 3 && f < 0.5; exp++)
	    f *= 2.0;
	mant = (f * (1 << 9) + 0.5);
	if (mant >= (1 << 9))
	    mant = (1 << 9) - 1;
    }
    ret = (exp << 9) | mant;
    return ret;
}

static CARD16
i830_float_to_luma (float f)
{
    CARD16  ret;

    ret = (f * (1 << 9));
    return ret;
}

static void
i830_tv_mode_set(xf86OutputPtr output, DisplayModePtr mode,
		 DisplayModePtr adjusted_mode)
{
    ScrnInfoPtr		    pScrn = output->scrn;
    I830Ptr		    pI830 = I830PTR(pScrn);
    xf86CrtcPtr	    crtc = output->crtc;
    I830OutputPrivatePtr    intel_output = output->driver_private;
    I830CrtcPrivatePtr	    intel_crtc = crtc->driver_private;
    struct i830_tv_priv	    *dev_priv = intel_output->dev_priv;
    const tv_mode_t	    *tv_mode;
    CARD32		    tv_ctl, tv_filter_ctl;
    CARD32		    hctl1, hctl2, hctl3;
    CARD32		    vctl1, vctl2, vctl3, vctl4, vctl5, vctl6, vctl7;
    CARD32		    scctl1, scctl2, scctl3;
    int			    i;
    const video_levels_t	*video_levels;
    const color_conversion_t	*color_conversion;
    Bool		    burst_ena;

    /* Need to actually choose or construct the appropriate
     * mode.  For now, just set the first one in the list, with
     * NTSC format.
     */
    tv_mode = &tv_modes[0];
    
    tv_ctl = 0;

    switch (dev_priv->type) {
    default:
    case TV_TYPE_UNKNOWN:
    case TV_TYPE_COMPOSITE:
	tv_ctl |= TV_ENC_OUTPUT_COMPOSITE;
	video_levels = &tv_mode->composite_levels;
	color_conversion = &tv_mode->composite_color;
	burst_ena = tv_mode->burst_ena;
	break;
    case TV_TYPE_COMPONENT:
	tv_ctl |= TV_ENC_OUTPUT_COMPONENT;
	video_levels = &component_level;
	if (tv_mode->burst_ena)
	    color_conversion = &sdtv_component_color;
	else
	    color_conversion = &hdtv_component_color;
	burst_ena = FALSE;
	break;
    case TV_TYPE_SVIDEO:
	tv_ctl |= TV_ENC_OUTPUT_SVIDEO;
	video_levels = &tv_mode->svideo_levels;
	color_conversion = &tv_mode->svideo_color;
	burst_ena = tv_mode->burst_ena;
	break;
    }
    hctl1 = (tv_mode->hsync_end << TV_HSYNC_END_SHIFT) |
	(tv_mode->htotal << TV_HTOTAL_SHIFT);

    hctl2 = (tv_mode->hburst_start << 16) |
	(tv_mode->hburst_len << TV_HBURST_LEN_SHIFT);
    if (burst_ena)
	hctl2 |= TV_BURST_ENA;

    hctl3 = (tv_mode->hblank_start << TV_HBLANK_START_SHIFT) |
	(tv_mode->hblank_end << TV_HBLANK_END_SHIFT);

    vctl1 = (tv_mode->nbr_end << TV_NBR_END_SHIFT) |
	(tv_mode->vi_end_f1 << TV_VI_END_F1_SHIFT) |
	(tv_mode->vi_end_f2 << TV_VI_END_F2_SHIFT);

    vctl2 = (tv_mode->vsync_len << TV_VSYNC_LEN_SHIFT) |
	(tv_mode->vsync_start_f1 << TV_VSYNC_START_F1_SHIFT) |
	(tv_mode->vsync_start_f2 << TV_VSYNC_START_F2_SHIFT);

    vctl3 = (tv_mode->veq_len << TV_VEQ_LEN_SHIFT) |
	(tv_mode->veq_start_f1 << TV_VEQ_START_F1_SHIFT) |
	(tv_mode->veq_start_f2 << TV_VEQ_START_F2_SHIFT);
    if (tv_mode->veq_ena)
	vctl3 |= TV_EQUAL_ENA;

    vctl4 = (tv_mode->vburst_start_f1 << TV_VBURST_START_F1_SHIFT) |
	(tv_mode->vburst_end_f1 << TV_VBURST_END_F1_SHIFT);

    vctl5 = (tv_mode->vburst_start_f2 << TV_VBURST_START_F2_SHIFT) |
	(tv_mode->vburst_end_f2 << TV_VBURST_END_F2_SHIFT);

    vctl6 = (tv_mode->vburst_start_f3 << TV_VBURST_START_F3_SHIFT) |
	(tv_mode->vburst_end_f3 << TV_VBURST_END_F3_SHIFT);

    vctl7 = (tv_mode->vburst_start_f4 << TV_VBURST_START_F4_SHIFT) |
	(tv_mode->vburst_end_f4 << TV_VBURST_END_F4_SHIFT);

    if (intel_crtc->pipe == 1)
	tv_ctl |= TV_ENC_PIPEB_SELECT;

    tv_ctl |= tv_mode->oversample;
    if (tv_mode->progressive)
	tv_ctl |= TV_PROGRESSIVE;
    if (tv_mode->pal_burst)
	tv_ctl |= TV_PAL_BURST;

    scctl1 = TV_SC_DDA1_EN;
    
    if (tv_mode->dda2_inc)
	scctl1 |= TV_SC_DDA2_EN;
    
    if (tv_mode->dda3_inc)
	scctl1 |= TV_SC_DDA3_EN;
    
    scctl1 |= tv_mode->sc_reset;
    scctl1 |= video_levels->burst << TV_BURST_LEVEL_SHIFT;
    scctl1 |= tv_mode->dda1_inc << TV_SCDDA1_INC_SHIFT;

    scctl2 = tv_mode->dda2_size << TV_SCDDA2_SIZE_SHIFT |
	tv_mode->dda2_inc << TV_SCDDA2_INC_SHIFT;

    scctl3 = tv_mode->dda3_size << TV_SCDDA3_SIZE_SHIFT |
	tv_mode->dda3_inc << TV_SCDDA3_INC_SHIFT;

    /* Enable two fixes for the chips that need them. */
    if (pI830->PciInfo->chipType < PCI_CHIP_I945_G)
	tv_ctl |= TV_ENC_C0_FIX | TV_ENC_SDP_FIX;

    tv_filter_ctl = TV_AUTO_SCALE;
    if (mode->HDisplay > 1024)
	tv_ctl |= TV_V_FILTER_BYPASS;

    OUTREG(TV_H_CTL_1, hctl1);
    OUTREG(TV_H_CTL_2, hctl2);
    OUTREG(TV_H_CTL_3, hctl3);
    OUTREG(TV_V_CTL_1, vctl1);
    OUTREG(TV_V_CTL_2, vctl2);
    OUTREG(TV_V_CTL_3, vctl3);
    OUTREG(TV_V_CTL_4, vctl4);
    OUTREG(TV_V_CTL_5, vctl5);
    OUTREG(TV_V_CTL_6, vctl6);
    OUTREG(TV_V_CTL_7, vctl7);
    OUTREG(TV_SC_CTL_1, scctl1);
    OUTREG(TV_SC_CTL_2, scctl2);
    OUTREG(TV_SC_CTL_3, scctl3);
    
    OUTREG(TV_CSC_Y,
	   (i830_float_to_csc(color_conversion->ry) << 16) |
	   (i830_float_to_csc(color_conversion->gy)));
    OUTREG(TV_CSC_Y2,
	    (i830_float_to_csc(color_conversion->by) << 16) |
	    (i830_float_to_luma(color_conversion->ay)));
	   
    OUTREG(TV_CSC_U,
	   (i830_float_to_csc(color_conversion->ru) << 16) |
	   (i830_float_to_csc(color_conversion->gu)));

    OUTREG(TV_CSC_U2,
	    (i830_float_to_csc(color_conversion->bu) << 16) |
	    (i830_float_to_luma(color_conversion->au)));
	   
    OUTREG(TV_CSC_V,
	   (i830_float_to_csc(color_conversion->rv) << 16) |
	   (i830_float_to_csc(color_conversion->gv)));

    OUTREG(TV_CSC_V2,
	    (i830_float_to_csc(color_conversion->bv) << 16) |
	    (i830_float_to_luma(color_conversion->av)));
	   
    OUTREG(TV_CLR_KNOBS, 0x00606000);
    OUTREG(TV_CLR_LEVEL, ((video_levels->black << TV_BLACK_LEVEL_SHIFT) |
			  (video_levels->blank << TV_BLANK_LEVEL_SHIFT)));
    
    OUTREG(TV_WIN_POS, 0x00360024);
    OUTREG(TV_WIN_SIZE, 0x02640198);
    
    OUTREG(TV_FILTER_CTL_1, 0x8000085E);
    OUTREG(TV_FILTER_CTL_2, 0x00017878);
    OUTREG(TV_FILTER_CTL_3, 0x0000BC3C);
    for (i = 0; i < 60; i++)
	OUTREG(TV_H_LUMA_0 + (i <<2), h_luma[i]);
    for (i = 0; i < 60; i++)
	OUTREG(TV_H_CHROMA_0 + (i <<2), h_chroma[i]);
    for (i = 0; i < 43; i++)
	OUTREG(TV_V_LUMA_0 + (i <<2), v_luma[i]);
    for (i = 0; i < 43; i++)
	OUTREG(TV_V_CHROMA_0 + (i <<2), v_chroma[i]);

    OUTREG(TV_DAC, 0);
    OUTREG(TV_CTL, tv_ctl);
}

static const DisplayModeRec reported_modes[] = {
	{
		.name = "NTSC 480i",
		.Clock = TV_PLL_CLOCK,
		.HDisplay   = 1280,
		.HSyncStart = 1368,
		.HSyncEnd   = 1496,
		.HTotal     = 1712,

		.VDisplay   = 1024,
		.VSyncStart = 1027,
		.VSyncEnd   = 1034,
		.VTotal     = 1104,
		.type       = M_T_DRIVER
	},
	{
		.name = "NTSC 480i",
		.Clock = TV_PLL_CLOCK,
		.HDisplay   = 1024,
		.HSyncStart = 1080,
		.HSyncEnd   = 1184,
		.HTotal     = 1344,

		.VDisplay   = 768,
		.VSyncStart = 771,
		.VSyncEnd   = 777,
		.VTotal     = 806,
		.type       = M_T_DRIVER
	},
	{
		.name = "NTSC 480i",
		.Clock = TV_PLL_CLOCK,
		.HDisplay   = 800,
		.HSyncStart = 832,
		.HSyncEnd   = 912,
		.HTotal     = 1024,

		.VDisplay   = 600,
		.VSyncStart = 603,
		.VSyncEnd   = 607,
		.VTotal     = 650,
		.type       = M_T_DRIVER
	},
	{
		.name = "NTSC 480i",
		.Clock = TV_PLL_CLOCK,
		.HDisplay   = 640,
		.HSyncStart = 664,
		.HSyncEnd   = 720,
		.HTotal     = 800,

		.VDisplay   = 480,
		.VSyncStart = 483,
		.VSyncEnd   = 487,
		.VTotal     = 552,
		.type       = M_T_DRIVER
	},
	{
		.name = "PAL 576i",
		.Clock = TV_PLL_CLOCK,
		.HDisplay   = 1280,
		.HSyncStart = 1352,
		.HSyncEnd   = 1480,
		.HTotal     = 1680,

		.VDisplay   = 1024,
		.VSyncStart = 1027,
		.VSyncEnd   = 1034,
		.VTotal     = 1092,

		.type       = M_T_DRIVER
	},
	{
		.name = "PAL 576i",
		.Clock = TV_PLL_CLOCK,
		.HDisplay   = 1024,
		.HSyncStart = 1072,
		.HSyncEnd   = 1168,
		.HTotal     = 1312,
		.VDisplay   = 768,
		.VSyncStart = 771,
		.VSyncEnd   = 775,
		.VTotal     = 820,
		.VRefresh   = 50.0f,

		.type       = M_T_DRIVER
	},
	{
		.name = "PAL 576i",
		.Clock = TV_PLL_CLOCK,
		.HDisplay   = 800,
		.HSyncStart = 832,
		.HSyncEnd   = 904,
		.HTotal     = 1008,
		.VDisplay   = 600,
		.VSyncStart = 603,
		.VSyncEnd   = 607,
		.VTotal     = 642,
		.VRefresh   = 50.0f,

		.type       = M_T_DRIVER
	},
	{
		.name = "PAL 576i",
		.Clock = TV_PLL_CLOCK,
		.HDisplay   = 640,
		.HSyncStart = 664,
		.HSyncEnd   = 720,
		.HTotal     = 800,

		.VDisplay   = 480,
		.VSyncStart = 483,
		.VSyncEnd   = 487,
		.VTotal     = 516,
		.VRefresh   = 50.0f,
		.type       = M_T_DRIVER
	},
};

/**
 * Detects TV presence by checking for load.
 *
 * Requires that the current pipe's DPLL is active.
 
 * \return TRUE if TV is connected.
 * \return FALSE if TV is disconnected.
 */
static void
i830_tv_detect_type (xf86CrtcPtr    crtc,
		     xf86OutputPtr  output)
{
    ScrnInfoPtr		    pScrn = output->scrn;
    I830Ptr		    pI830 = I830PTR(pScrn);
    I830OutputPrivatePtr    intel_output = output->driver_private;
    struct i830_tv_priv	    *dev_priv = intel_output->dev_priv;
    CARD32		    tv_ctl, save_tv_ctl;
    CARD32		    tv_dac, save_tv_dac;
    int			    type = TV_TYPE_UNKNOWN;

    tv_dac = INREG(TV_DAC);
    /*
     * Detect TV by polling)
     */
    if (intel_output->load_detect_temp)
    {
	/* TV not currently running, prod it with destructive detect */
	save_tv_dac = tv_dac;
	tv_ctl = INREG(TV_CTL);
	save_tv_ctl = tv_ctl;
	tv_ctl &= ~TV_ENC_ENABLE;
	tv_ctl &= ~TV_TEST_MODE_MASK;
	tv_ctl |= TV_TEST_MODE_MONITOR_DETECT;
	tv_dac &= ~TVDAC_SENSE_MASK;
	tv_dac |= (TVDAC_STATE_CHG_EN |
		   TVDAC_A_SENSE_CTL |
		   TVDAC_B_SENSE_CTL |
		   TVDAC_C_SENSE_CTL |
		   DAC_CTL_OVERRIDE |
		   DAC_A_0_7_V |
		   DAC_B_0_7_V |
		   DAC_C_0_7_V);
	OUTREG(TV_CTL, tv_ctl);
	OUTREG(TV_DAC, tv_dac);
	i830WaitForVblank(pScrn);
	tv_dac = INREG(TV_DAC);
	OUTREG(TV_DAC, save_tv_dac);
	OUTREG(TV_CTL, save_tv_ctl);
    }
    /*
     *  A B C
     *  0 1 1 Composite
     *  1 0 X svideo
     *  0 0 0 Component
     */
    if ((tv_dac & TVDAC_SENSE_MASK) == (TVDAC_B_SENSE | TVDAC_C_SENSE)) {
	xf86DrvMsg(pScrn->scrnIndex, X_INFO,
		   "Detected Composite TV connection\n");
	type = TV_TYPE_COMPOSITE;
    } else if ((tv_dac & (TVDAC_A_SENSE|TVDAC_B_SENSE)) == TVDAC_A_SENSE) {
	xf86DrvMsg(pScrn->scrnIndex, X_INFO,
		   "Detected S-Video TV connection\n");
	type = TV_TYPE_SVIDEO;
    } else if ((tv_dac & TVDAC_SENSE_MASK) == 0) {
	xf86DrvMsg(pScrn->scrnIndex, X_INFO,
		   "Detected Component TV connection\n");
	type = TV_TYPE_COMPONENT;
    } else {
	xf86DrvMsg(pScrn->scrnIndex, X_INFO,
		   "No TV connection detected\n");
	type = TV_TYPE_NONE;
    }
    
    dev_priv->type = type;
}

/**
 * Detect the TV connection.
 *
 * Currently this always returns OUTPUT_STATUS_UNKNOWN, as we need to be sure
 * we have a pipe programmed in order to probe the TV.
 */
static xf86OutputStatus
i830_tv_detect(xf86OutputPtr output)
{
    xf86CrtcPtr		    crtc;
    DisplayModeRec	    mode;
    I830OutputPrivatePtr    intel_output = output->driver_private;
    struct i830_tv_priv	    *dev_priv = intel_output->dev_priv;

    crtc = i830GetLoadDetectPipe (output);
    if (crtc)
    {
	if (intel_output->load_detect_temp)
	{
	    /* we only need the pixel clock set correctly here */
	    mode = reported_modes[0];
	    xf86SetModeCrtc (&mode, INTERLACE_HALVE_V);
	    i830PipeSetMode (crtc, &mode, FALSE);
	}
	i830_tv_detect_type (crtc, output);
	i830ReleaseLoadDetectPipe (output);
    }
    
    switch (dev_priv->type) {
    case TV_TYPE_NONE:
	return XF86OutputStatusDisconnected;
    case TV_TYPE_UNKNOWN:
	return XF86OutputStatusUnknown;
    default:
	return XF86OutputStatusConnected;
    }
}

/**
 * Stub get_modes function.
 *
 * This should probably return a set of fixed modes, unless we can figure out
 * how to probe modes off of TV connections.
 */
static DisplayModePtr
i830_tv_get_modes(xf86OutputPtr output)
{
    ScrnInfoPtr	    pScrn = output->scrn;
    I830Ptr	    pI830 = I830PTR(pScrn);
    DisplayModePtr  new, first = NULL, *tail = &first;
    int		    i;

    (void) pI830;

    for (i = 0; i < sizeof (reported_modes) / sizeof (reported_modes[0]); i++)
    {
	new             = xnfcalloc(1, sizeof (DisplayModeRec));

	*new = reported_modes[i];
	new->name = xnfalloc(strlen(reported_modes[i].name) + 1);
	strcpy(new->name, reported_modes[i].name);
	*tail = new;
	tail = &new->next;
    }

    return first;
}

static void
i830_tv_destroy (xf86OutputPtr output)
{
    if (output->driver_private)
	xfree (output->driver_private);
}

static const xf86OutputFuncsRec i830_tv_output_funcs = {
    .dpms = i830_tv_dpms,
    .save = i830_tv_save,
    .restore = i830_tv_restore,
    .mode_valid = i830_tv_mode_valid,
    .mode_fixup = i830_tv_mode_fixup,
    .mode_set = i830_tv_mode_set,
    .detect = i830_tv_detect,
    .get_modes = i830_tv_get_modes,
    .destroy = i830_tv_destroy
};

void
i830_tv_init(ScrnInfoPtr pScrn)
{
    I830Ptr		    pI830 = I830PTR(pScrn);
    xf86OutputPtr	    output;
    I830OutputPrivatePtr    intel_output;
    struct i830_tv_priv	    *dev_priv;
    CARD32		    tv_dac_on, tv_dac_off, save_tv_dac;
 
    if ((INREG(TV_CTL) & TV_FUSE_STATE_MASK) == TV_FUSE_STATE_DISABLED)
	return;

    /*
     * Sanity check the TV output by checking to see if the
     * DAC register holds a value
     */
    save_tv_dac = INREG(TV_DAC);
    
    OUTREG(TV_DAC, save_tv_dac | TVDAC_STATE_CHG_EN);
    tv_dac_on = INREG(TV_DAC);
    
    OUTREG(TV_DAC, save_tv_dac & ~TVDAC_STATE_CHG_EN);
    tv_dac_off = INREG(TV_DAC);
    
    OUTREG(TV_DAC, save_tv_dac);
    
    /*
     * If the register does not hold the state change enable
     * bit, (either as a 0 or a 1), assume it doesn't really
     * exist
     */
    if ((tv_dac_on & TVDAC_STATE_CHG_EN) == 0 || 
	(tv_dac_off & TVDAC_STATE_CHG_EN) != 0)
	return;
    
    output = xf86OutputCreate (pScrn, &i830_tv_output_funcs, "TV");
    
    if (!output)
	return;
    
    intel_output = xnfcalloc (sizeof (I830OutputPrivateRec) +
			      sizeof (struct i830_tv_priv), 1);
    if (!intel_output)
    {
	xf86OutputDestroy (output);
	return;
    }
    dev_priv = (struct i830_tv_priv *) (intel_output + 1);
    intel_output->type = I830_OUTPUT_TVOUT;
    intel_output->dev_priv = dev_priv;
    dev_priv->type = TV_TYPE_UNKNOWN;
    
    output->driver_private = intel_output;
    output->interlaceAllowed = FALSE;
    output->doubleScanAllowed = FALSE;
}