/*
 * Copyright © 2006-2008 Intel Corporation
 *   Jesse Barnes <jesse.barnes@intel.com>
 *
 * 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.
 */

#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
#include <drm/drm_edid.h>

#include "i915_drv.h"
#include "intel_connector.h"
#include "intel_display_types.h"
#include "intel_hotplug.h"
#include "intel_tv.h"

enum tv_margin {
        TV_MARGIN_LEFT, TV_MARGIN_TOP,
        TV_MARGIN_RIGHT, TV_MARGIN_BOTTOM
};

struct intel_tv {
        struct intel_encoder base;

        int type;
};

struct video_levels {
        u16 blank, black;
        u8 burst;
};

struct color_conversion {
        u16 ry, gy, by, ay;
        u16 ru, gu, bu, au;
        u16 rv, gv, bv, av;
};

static const u32 filter_table[] = {
        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,
        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,
        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, 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,
};

/*
 * Color conversion values have 3 separate fixed point formats:
 *
 * 10 bit fields (ay, au)
 *   1.9 fixed point (b.bbbbbbbbb)
 * 11 bit fields (ry, by, ru, gu, gv)
 *   exp.mantissa (ee.mmmmmmmmm)
 *   ee = 00 = 10^-1 (0.mmmmmmmmm)
 *   ee = 01 = 10^-2 (0.0mmmmmmmmm)
 *   ee = 10 = 10^-3 (0.00mmmmmmmmm)
 *   ee = 11 = 10^-4 (0.000mmmmmmmmm)
 * 12 bit fields (gy, rv, bu)
 *   exp.mantissa (eee.mmmmmmmmm)
 *   eee = 000 = 10^-1 (0.mmmmmmmmm)
 *   eee = 001 = 10^-2 (0.0mmmmmmmmm)
 *   eee = 010 = 10^-3 (0.00mmmmmmmmm)
 *   eee = 011 = 10^-4 (0.000mmmmmmmmm)
 *   eee = 100 = reserved
 *   eee = 101 = reserved
 *   eee = 110 = reserved
 *   eee = 111 = 10^0 (m.mmmmmmmm) (only usable for 1.0 representation)
 *
 * Saturation and contrast are 8 bits, with their own representation:
 * 8 bit field (saturation, contrast)
 *   exp.mantissa (ee.mmmmmm)
 *   ee = 00 = 10^-1 (0.mmmmmm)
 *   ee = 01 = 10^0 (m.mmmmm)
 *   ee = 10 = 10^1 (mm.mmmm)
 *   ee = 11 = 10^2 (mmm.mmm)
 *
 * Simple conversion function:
 *
 * static u32
 * float_to_csc_11(float f)
 * {
 *     u32 exp;
 *     u32 mant;
 *     u32 ret;
 *
 *     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;
 * }
 */

/*
 * Behold, magic numbers!  If we plant them they might grow a big
 * s-video cable to the sky... or something.
 *
 * Pre-converted to appropriate hex value.
 */

/*
 * PAL & NTSC values for composite & s-video connections
 */
static const struct color_conversion ntsc_m_csc_composite = {
        .ry = 0x0332, .gy = 0x012d, .by = 0x07d3, .ay = 0x0104,
        .ru = 0x0733, .gu = 0x052d, .bu = 0x05c7, .au = 0x0200,
        .rv = 0x0340, .gv = 0x030c, .bv = 0x06d0, .av = 0x0200,
};

static const struct video_levels ntsc_m_levels_composite = {
        .blank = 225, .black = 267, .burst = 113,
};

static const struct color_conversion ntsc_m_csc_svideo = {
        .ry = 0x0332, .gy = 0x012d, .by = 0x07d3, .ay = 0x0133,
        .ru = 0x076a, .gu = 0x0564, .bu = 0x030d, .au = 0x0200,
        .rv = 0x037a, .gv = 0x033d, .bv = 0x06f6, .av = 0x0200,
};

static const struct video_levels ntsc_m_levels_svideo = {
        .blank = 266, .black = 316, .burst = 133,
};

static const struct color_conversion ntsc_j_csc_composite = {
        .ry = 0x0332, .gy = 0x012d, .by = 0x07d3, .ay = 0x0119,
        .ru = 0x074c, .gu = 0x0546, .bu = 0x05ec, .au = 0x0200,
        .rv = 0x035a, .gv = 0x0322, .bv = 0x06e1, .av = 0x0200,
};

static const struct video_levels ntsc_j_levels_composite = {
        .blank = 225, .black = 225, .burst = 113,
};

static const struct color_conversion ntsc_j_csc_svideo = {
        .ry = 0x0332, .gy = 0x012d, .by = 0x07d3, .ay = 0x014c,
        .ru = 0x0788, .gu = 0x0581, .bu = 0x0322, .au = 0x0200,
        .rv = 0x0399, .gv = 0x0356, .bv = 0x070a, .av = 0x0200,
};

static const struct video_levels ntsc_j_levels_svideo = {
        .blank = 266, .black = 266, .burst = 133,
};

static const struct color_conversion pal_csc_composite = {
        .ry = 0x0332, .gy = 0x012d, .by = 0x07d3, .ay = 0x0113,
        .ru = 0x0745, .gu = 0x053f, .bu = 0x05e1, .au = 0x0200,
        .rv = 0x0353, .gv = 0x031c, .bv = 0x06dc, .av = 0x0200,
};

static const struct video_levels pal_levels_composite = {
        .blank = 237, .black = 237, .burst = 118,
};

static const struct color_conversion pal_csc_svideo = {
        .ry = 0x0332, .gy = 0x012d, .by = 0x07d3, .ay = 0x0145,
        .ru = 0x0780, .gu = 0x0579, .bu = 0x031c, .au = 0x0200,
        .rv = 0x0390, .gv = 0x034f, .bv = 0x0705, .av = 0x0200,
};

static const struct video_levels pal_levels_svideo = {
        .blank = 280, .black = 280, .burst = 139,
};

static const struct color_conversion pal_m_csc_composite = {
        .ry = 0x0332, .gy = 0x012d, .by = 0x07d3, .ay = 0x0104,
        .ru = 0x0733, .gu = 0x052d, .bu = 0x05c7, .au = 0x0200,
        .rv = 0x0340, .gv = 0x030c, .bv = 0x06d0, .av = 0x0200,
};

static const struct video_levels pal_m_levels_composite = {
        .blank = 225, .black = 267, .burst = 113,
};

static const struct color_conversion pal_m_csc_svideo = {
        .ry = 0x0332, .gy = 0x012d, .by = 0x07d3, .ay = 0x0133,
        .ru = 0x076a, .gu = 0x0564, .bu = 0x030d, .au = 0x0200,
        .rv = 0x037a, .gv = 0x033d, .bv = 0x06f6, .av = 0x0200,
};

static const struct video_levels pal_m_levels_svideo = {
        .blank = 266, .black = 316, .burst = 133,
};

static const struct color_conversion pal_n_csc_composite = {
        .ry = 0x0332, .gy = 0x012d, .by = 0x07d3, .ay = 0x0104,
        .ru = 0x0733, .gu = 0x052d, .bu = 0x05c7, .au = 0x0200,
        .rv = 0x0340, .gv = 0x030c, .bv = 0x06d0, .av = 0x0200,
};

static const struct video_levels pal_n_levels_composite = {
        .blank = 225, .black = 267, .burst = 118,
};

static const struct color_conversion pal_n_csc_svideo = {
        .ry = 0x0332, .gy = 0x012d, .by = 0x07d3, .ay = 0x0133,
        .ru = 0x076a, .gu = 0x0564, .bu = 0x030d, .au = 0x0200,
        .rv = 0x037a, .gv = 0x033d, .bv = 0x06f6, .av = 0x0200,
};

static const struct video_levels pal_n_levels_svideo = {
        .blank = 266, .black = 316, .burst = 139,
};

/*
 * Component connections
 */
static const struct color_conversion sdtv_csc_yprpb = {
        .ry = 0x0332, .gy = 0x012d, .by = 0x07d3, .ay = 0x0145,
        .ru = 0x0559, .gu = 0x0353, .bu = 0x0100, .au = 0x0200,
        .rv = 0x0100, .gv = 0x03ad, .bv = 0x074d, .av = 0x0200,
};

static const struct color_conversion hdtv_csc_yprpb = {
        .ry = 0x05b3, .gy = 0x016e, .by = 0x0728, .ay = 0x0145,
        .ru = 0x07d5, .gu = 0x038b, .bu = 0x0100, .au = 0x0200,
        .rv = 0x0100, .gv = 0x03d1, .bv = 0x06bc, .av = 0x0200,
};

static const struct video_levels component_levels = {
        .blank = 279, .black = 279, .burst = 0,
};


struct tv_mode {
        const char *name;

        u32 clock;
        u16 refresh; /* in millihertz (for precision) */
        u8 oversample;
        u8 hsync_end;
        u16 hblank_start, hblank_end, htotal;
        bool progressive : 1, trilevel_sync : 1, component_only : 1;
        u8 vsync_start_f1, vsync_start_f2, vsync_len;
        bool veq_ena : 1;
        u8 veq_start_f1, veq_start_f2, veq_len;
        u8 vi_end_f1, vi_end_f2;
        u16 nbr_end;
        bool burst_ena : 1;
        u8 hburst_start, hburst_len;
        u8 vburst_start_f1;
        u16 vburst_end_f1;
        u8 vburst_start_f2;
        u16 vburst_end_f2;
        u8 vburst_start_f3;
        u16 vburst_end_f3;
        u8 vburst_start_f4;
        u16 vburst_end_f4;
        /*
         * subcarrier programming
         */
        u16 dda2_size, dda3_size;
        u8 dda1_inc;
        u16 dda2_inc, dda3_inc;
        u32 sc_reset;
        bool pal_burst : 1;
        /*
         * blank/black levels
         */
        const struct video_levels *composite_levels, *svideo_levels;
        const struct color_conversion *composite_color, *svideo_color;
        const u32 *filter_table;
};


/*
 * 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.
 */
static const struct tv_mode tv_modes[] = {
        {
                .name           = "NTSC-M",
                .clock          = 108000,
                .refresh        = 59940,
                .oversample     = 8,
                .component_only = false,
                /* 525 Lines, 60 Fields, 15.734KHz line, Sub-Carrier 3.580MHz */

                .hsync_end      = 64,               .hblank_end         = 124,
                .hblank_start   = 836,              .htotal             = 857,

                .progressive    = false,            .trilevel_sync = 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       =    135,
                .dda2_inc       =  20800,           .dda2_size          =  27456,
                .dda3_inc       =      0,           .dda3_size          =      0,
                .sc_reset       = TV_SC_RESET_EVERY_4,
                .pal_burst      = false,

                .composite_levels = &ntsc_m_levels_composite,
                .composite_color = &ntsc_m_csc_composite,
                .svideo_levels  = &ntsc_m_levels_svideo,
                .svideo_color = &ntsc_m_csc_svideo,

                .filter_table = filter_table,
        },
        {
                .name           = "NTSC-443",
                .clock          = 108000,
                .refresh        = 59940,
                .oversample     = 8,
                .component_only = false,
                /* 525 Lines, 60 Fields, 15.734KHz line, Sub-Carrier 4.43MHz */
                .hsync_end      = 64,               .hblank_end         = 124,
                .hblank_start   = 836,              .htotal             = 857,

                .progressive    = false,            .trilevel_sync = 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 4.4336180 actual 4.4336180 clock 107.52 */
                .dda1_inc       =    168,
                .dda2_inc       =   4093,       .dda2_size      =  27456,
                .dda3_inc       =    310,       .dda3_size      =    525,
                .sc_reset   = TV_SC_RESET_NEVER,
                .pal_burst  = false,

                .composite_levels = &ntsc_m_levels_composite,
                .composite_color = &ntsc_m_csc_composite,
                .svideo_levels  = &ntsc_m_levels_svideo,
                .svideo_color = &ntsc_m_csc_svideo,

                .filter_table = filter_table,
        },
        {
                .name           = "NTSC-J",
                .clock          = 108000,
                .refresh        = 59940,
                .oversample     = 8,
                .component_only = false,

                /* 525 Lines, 60 Fields, 15.734KHz line, Sub-Carrier 3.580MHz */
                .hsync_end      = 64,               .hblank_end         = 124,
                .hblank_start = 836,        .htotal             = 857,

                .progressive    = false,    .trilevel_sync = 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       =    135,
                .dda2_inc       =  20800,           .dda2_size          =  27456,
                .dda3_inc       =      0,           .dda3_size          =      0,
                .sc_reset       = TV_SC_RESET_EVERY_4,
                .pal_burst      = false,

                .composite_levels = &ntsc_j_levels_composite,
                .composite_color = &ntsc_j_csc_composite,
                .svideo_levels  = &ntsc_j_levels_svideo,
                .svideo_color = &ntsc_j_csc_svideo,

                .filter_table = filter_table,
        },
        {
                .name           = "PAL-M",
                .clock          = 108000,
                .refresh        = 59940,
                .oversample     = 8,
                .component_only = false,

                /* 525 Lines, 60 Fields, 15.734KHz line, Sub-Carrier 3.580MHz */
                .hsync_end      = 64,             .hblank_end           = 124,
                .hblank_start = 836,      .htotal               = 857,

                .progressive    = false,            .trilevel_sync = 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       =    135,
                .dda2_inc       =  16704,           .dda2_size          =  27456,
                .dda3_inc       =      0,           .dda3_size          =      0,
                .sc_reset       = TV_SC_RESET_EVERY_8,
                .pal_burst  = true,

                .composite_levels = &pal_m_levels_composite,
                .composite_color = &pal_m_csc_composite,
                .svideo_levels  = &pal_m_levels_svideo,
                .svideo_color = &pal_m_csc_svideo,

                .filter_table = filter_table,
        },
        {
                /* 625 Lines, 50 Fields, 15.625KHz line, Sub-Carrier 4.434MHz */
                .name       = "PAL-N",
                .clock          = 108000,
                .refresh        = 50000,
                .oversample     = 8,
                .component_only = false,

                .hsync_end      = 64,               .hblank_end         = 128,
                .hblank_start = 844,        .htotal             = 863,

                .progressive  = false,    .trilevel_sync = 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       =    135,
                .dda2_inc       =  23578,       .dda2_size      =  27648,
                .dda3_inc       =    134,       .dda3_size      =    625,
                .sc_reset   = TV_SC_RESET_EVERY_8,
                .pal_burst  = true,

                .composite_levels = &pal_n_levels_composite,
                .composite_color = &pal_n_csc_composite,
                .svideo_levels  = &pal_n_levels_svideo,
                .svideo_color = &pal_n_csc_svideo,

                .filter_table = filter_table,
        },
        {
                /* 625 Lines, 50 Fields, 15.625KHz line, Sub-Carrier 4.434MHz */
                .name       = "PAL",
                .clock          = 108000,
                .refresh        = 50000,
                .oversample     = 8,
                .component_only = false,

                .hsync_end      = 64,               .hblank_end         = 142,
                .hblank_start   = 844,      .htotal             = 863,

                .progressive    = false,    .trilevel_sync = false,

                .vsync_start_f1 = 5,        .vsync_start_f2     = 6,
                .vsync_len      = 5,

                .veq_ena        = true,     .veq_start_f1       = 0,
                .veq_start_f2   = 1,        .veq_len            = 15,

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

                .burst_ena      = true,
                .hburst_start   = 73,               .hburst_len         = 32,
                .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       =   4122,       .dda2_size      =  27648,
                .dda3_inc       =     67,       .dda3_size      =    625,
                .sc_reset   = TV_SC_RESET_EVERY_8,
                .pal_burst  = true,

                .composite_levels = &pal_levels_composite,
                .composite_color = &pal_csc_composite,
                .svideo_levels  = &pal_levels_svideo,
                .svideo_color = &pal_csc_svideo,

                .filter_table = filter_table,
        },
        {
                .name       = "480p",
                .clock          = 108000,
                .refresh        = 59940,
                .oversample     = 4,
                .component_only = true,

                .hsync_end      = 64,               .hblank_end         = 122,
                .hblank_start   = 842,              .htotal             = 857,

                .progressive    = true,             .trilevel_sync = false,

                .vsync_start_f1 = 12,               .vsync_start_f2     = 12,
                .vsync_len      = 12,

                .veq_ena        = false,

                .vi_end_f1      = 44,               .vi_end_f2          = 44,
                .nbr_end        = 479,

                .burst_ena      = false,

                .filter_table = filter_table,
        },
        {
                .name       = "576p",
                .clock          = 108000,
                .refresh        = 50000,
                .oversample     = 4,
                .component_only = true,

                .hsync_end      = 64,               .hblank_end         = 139,
                .hblank_start   = 859,              .htotal             = 863,

                .progressive    = true,             .trilevel_sync = false,

                .vsync_start_f1 = 10,               .vsync_start_f2     = 10,
                .vsync_len      = 10,

                .veq_ena        = false,

                .vi_end_f1      = 48,               .vi_end_f2          = 48,
                .nbr_end        = 575,

                .burst_ena      = false,

                .filter_table = filter_table,
        },
        {
                .name       = "720p@60Hz",
                .clock          = 148500,
                .refresh        = 60000,
                .oversample     = 2,
                .component_only = true,

                .hsync_end      = 80,               .hblank_end         = 300,
                .hblank_start   = 1580,             .htotal             = 1649,

                .progressive    = true,             .trilevel_sync = true,

                .vsync_start_f1 = 10,               .vsync_start_f2     = 10,
                .vsync_len      = 10,

                .veq_ena        = false,

                .vi_end_f1      = 29,               .vi_end_f2          = 29,
                .nbr_end        = 719,

                .burst_ena      = false,

                .filter_table = filter_table,
        },
        {
                .name       = "720p@50Hz",
                .clock          = 148500,
                .refresh        = 50000,
                .oversample     = 2,
                .component_only = true,

                .hsync_end      = 80,               .hblank_end         = 300,
                .hblank_start   = 1580,             .htotal             = 1979,

                .progressive    = true,             .trilevel_sync = true,

                .vsync_start_f1 = 10,               .vsync_start_f2     = 10,
                .vsync_len      = 10,

                .veq_ena        = false,

                .vi_end_f1      = 29,               .vi_end_f2          = 29,
                .nbr_end        = 719,

                .burst_ena      = false,

                .filter_table = filter_table,
        },
        {
                .name       = "1080i@50Hz",
                .clock          = 148500,
                .refresh        = 50000,
                .oversample     = 2,
                .component_only = true,

                .hsync_end      = 88,               .hblank_end         = 235,
                .hblank_start   = 2155,             .htotal             = 2639,

                .progressive    = false,          .trilevel_sync = true,

                .vsync_start_f1 = 4,              .vsync_start_f2     = 5,
                .vsync_len      = 10,

                .veq_ena        = true,     .veq_start_f1       = 4,
                .veq_start_f2   = 4,        .veq_len            = 10,


                .vi_end_f1      = 21,           .vi_end_f2          = 22,
                .nbr_end        = 539,

                .burst_ena      = false,

                .filter_table = filter_table,
        },
        {
                .name       = "1080i@60Hz",
                .clock          = 148500,
                .refresh        = 60000,
                .oversample     = 2,
                .component_only = true,

                .hsync_end      = 88,               .hblank_end         = 235,
                .hblank_start   = 2155,             .htotal             = 2199,

                .progressive    = false,            .trilevel_sync = true,

                .vsync_start_f1 = 4,               .vsync_start_f2     = 5,
                .vsync_len      = 10,

                .veq_ena        = true,             .veq_start_f1       = 4,
                .veq_start_f2   = 4,                .veq_len            = 10,


                .vi_end_f1      = 21,               .vi_end_f2          = 22,
                .nbr_end        = 539,

                .burst_ena      = false,

                .filter_table = filter_table,
        },

        {
                .name       = "1080p@30Hz",
                .clock          = 148500,
                .refresh        = 30000,
                .oversample     = 2,
                .component_only = true,

                .hsync_end      = 88,               .hblank_end         = 235,
                .hblank_start   = 2155,             .htotal             = 2199,

                .progressive    = true,             .trilevel_sync = true,

                .vsync_start_f1 = 8,               .vsync_start_f2     = 8,
                .vsync_len      = 10,

                .veq_ena        = false,        .veq_start_f1   = 0,
                .veq_start_f2   = 0,                .veq_len            = 0,

                .vi_end_f1      = 44,               .vi_end_f2          = 44,
                .nbr_end        = 1079,

                .burst_ena      = false,

                .filter_table = filter_table,
        },

        {
                .name       = "1080p@50Hz",
                .clock          = 148500,
                .refresh        = 50000,
                .oversample     = 1,
                .component_only = true,

                .hsync_end      = 88,               .hblank_end         = 235,
                .hblank_start   = 2155,             .htotal             = 2639,

                .progressive    = true,             .trilevel_sync = true,

                .vsync_start_f1 = 8,               .vsync_start_f2     = 8,
                .vsync_len      = 10,

                .veq_ena        = false,        .veq_start_f1   = 0,
                .veq_start_f2   = 0,                .veq_len            = 0,

                .vi_end_f1      = 44,               .vi_end_f2          = 44,
                .nbr_end        = 1079,

                .burst_ena      = false,

                .filter_table = filter_table,
        },

        {
                .name       = "1080p@60Hz",
                .clock          = 148500,
                .refresh        = 60000,
                .oversample     = 1,
                .component_only = true,

                .hsync_end      = 88,               .hblank_end         = 235,
                .hblank_start   = 2155,             .htotal             = 2199,

                .progressive    = true,             .trilevel_sync = true,

                .vsync_start_f1 = 8,               .vsync_start_f2     = 8,
                .vsync_len      = 10,

                .veq_ena        = false,                    .veq_start_f1       = 0,
                .veq_start_f2   = 0,                .veq_len            = 0,

                .vi_end_f1      = 44,               .vi_end_f2          = 44,
                .nbr_end        = 1079,

                .burst_ena      = false,

                .filter_table = filter_table,
        },
};

struct intel_tv_connector_state {
        struct drm_connector_state base;

        /*
         * May need to override the user margins for
         * gen3 >1024 wide source vertical centering.
         */
        struct {
                u16 top, bottom;
        } margins;

        bool bypass_vfilter;
};

#define to_intel_tv_connector_state(x) container_of(x, struct intel_tv_connector_state, base)

static struct drm_connector_state *
intel_tv_connector_duplicate_state(struct drm_connector *connector)
{
        struct intel_tv_connector_state *state;

        state = kmemdup(connector->state, sizeof(*state), GFP_KERNEL);
        if (!state)
                return NULL;

        __drm_atomic_helper_connector_duplicate_state(connector, &state->base);
        return &state->base;
}

static struct intel_tv *enc_to_tv(struct intel_encoder *encoder)
{
        return container_of(encoder, struct intel_tv, base);
}

static struct intel_tv *intel_attached_tv(struct intel_connector *connector)
{
        return enc_to_tv(intel_attached_encoder(connector));
}

static bool
intel_tv_get_hw_state(struct intel_encoder *encoder, enum pipe *pipe)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        u32 tmp = intel_de_read(dev_priv, TV_CTL);

        *pipe = (tmp & TV_ENC_PIPE_SEL_MASK) >> TV_ENC_PIPE_SEL_SHIFT;

        return tmp & TV_ENC_ENABLE;
}

static void
intel_enable_tv(struct intel_atomic_state *state,
                struct intel_encoder *encoder,
                const struct intel_crtc_state *pipe_config,
                const struct drm_connector_state *conn_state)
{
        struct drm_device *dev = encoder->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);

        /* Prevents vblank waits from timing out in intel_tv_detect_type() */
        intel_wait_for_vblank(dev_priv,
                              to_intel_crtc(pipe_config->uapi.crtc)->pipe);

        intel_de_write(dev_priv, TV_CTL,
                       intel_de_read(dev_priv, TV_CTL) | TV_ENC_ENABLE);
}

static void
intel_disable_tv(struct intel_atomic_state *state,
                 struct intel_encoder *encoder,
                 const struct intel_crtc_state *old_crtc_state,
                 const struct drm_connector_state *old_conn_state)
{
        struct drm_device *dev = encoder->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);

        intel_de_write(dev_priv, TV_CTL,
                       intel_de_read(dev_priv, TV_CTL) & ~TV_ENC_ENABLE);
}

static const struct tv_mode *intel_tv_mode_find(const struct drm_connector_state *conn_state)
{
        int format = conn_state->tv.mode;

        return &tv_modes[format];
}

static enum drm_mode_status
intel_tv_mode_valid(struct drm_connector *connector,
                    struct drm_display_mode *mode)
{
        const struct tv_mode *tv_mode = intel_tv_mode_find(connector->state);
        int max_dotclk = to_i915(connector->dev)->max_dotclk_freq;

        if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
                return MODE_NO_DBLESCAN;

        if (mode->clock > max_dotclk)
                return MODE_CLOCK_HIGH;

        /* Ensure TV refresh is close to desired refresh */
        if (abs(tv_mode->refresh - drm_mode_vrefresh(mode) * 1000) >= 1000)
                return MODE_CLOCK_RANGE;

        return MODE_OK;
}

static int
intel_tv_mode_vdisplay(const struct tv_mode *tv_mode)
{
        if (tv_mode->progressive)
                return tv_mode->nbr_end + 1;
        else
                return 2 * (tv_mode->nbr_end + 1);
}

static void
intel_tv_mode_to_mode(struct drm_display_mode *mode,
                      const struct tv_mode *tv_mode)
{
        mode->clock = tv_mode->clock /
                (tv_mode->oversample >> !tv_mode->progressive);

        /*
         * tv_mode horizontal timings:
         *
         * hsync_end
         *    | hblank_end
         *    |    | hblank_start
         *    |    |       | htotal
         *    |     _______    |
         *     ____/       \___
         * \__/                \
         */
        mode->hdisplay =

                tv_mode->hblank_start - tv_mode->hblank_end;
        mode->hsync_start = mode->hdisplay +
                tv_mode->htotal - tv_mode->hblank_start;
        mode->hsync_end = mode->hsync_start +
                tv_mode->hsync_end;
        mode->htotal = tv_mode->htotal + 1;

        /*
         * tv_mode vertical timings:
         *
         * vsync_start
         *    | vsync_end
         *    |  | vi_end nbr_end
         *    |  |    |       |
         *    |  |     _______
         * \__    ____/       \
         *    \__/
         */
        mode->vdisplay = intel_tv_mode_vdisplay(tv_mode);
        if (tv_mode->progressive) {
                mode->vsync_start = mode->vdisplay +
                        tv_mode->vsync_start_f1 + 1;
                mode->vsync_end = mode->vsync_start +
                        tv_mode->vsync_len;
                mode->vtotal = mode->vdisplay +
                        tv_mode->vi_end_f1 + 1;
        } else {
                mode->vsync_start = mode->vdisplay +
                        tv_mode->vsync_start_f1 + 1 +
                        tv_mode->vsync_start_f2 + 1;
                mode->vsync_end = mode->vsync_start +
                        2 * tv_mode->vsync_len;
                mode->vtotal = mode->vdisplay +
                        tv_mode->vi_end_f1 + 1 +
                        tv_mode->vi_end_f2 + 1;
        }

        /* TV has it's own notion of sync and other mode flags, so clear them. */
        mode->flags = 0;

        mode->vrefresh = 0;
        mode->vrefresh = drm_mode_vrefresh(mode);

        snprintf(mode->name, sizeof(mode->name),
                 "%dx%d%c (%s)",
                 mode->hdisplay, mode->vdisplay,
                 tv_mode->progressive ? 'p' : 'i',
                 tv_mode->name);
}

static void intel_tv_scale_mode_horiz(struct drm_display_mode *mode,
                                      int hdisplay, int left_margin,
                                      int right_margin)
{
        int hsync_start = mode->hsync_start - mode->hdisplay + right_margin;
        int hsync_end = mode->hsync_end - mode->hdisplay + right_margin;
        int new_htotal = mode->htotal * hdisplay /
                (mode->hdisplay - left_margin - right_margin);

        mode->clock = mode->clock * new_htotal / mode->htotal;

        mode->hdisplay = hdisplay;
        mode->hsync_start = hdisplay + hsync_start * new_htotal / mode->htotal;
        mode->hsync_end = hdisplay + hsync_end * new_htotal / mode->htotal;
        mode->htotal = new_htotal;
}

static void intel_tv_scale_mode_vert(struct drm_display_mode *mode,
                                     int vdisplay, int top_margin,
                                     int bottom_margin)
{
        int vsync_start = mode->vsync_start - mode->vdisplay + bottom_margin;
        int vsync_end = mode->vsync_end - mode->vdisplay + bottom_margin;
        int new_vtotal = mode->vtotal * vdisplay /
                (mode->vdisplay - top_margin - bottom_margin);

        mode->clock = mode->clock * new_vtotal / mode->vtotal;

        mode->vdisplay = vdisplay;
        mode->vsync_start = vdisplay + vsync_start * new_vtotal / mode->vtotal;
        mode->vsync_end = vdisplay + vsync_end * new_vtotal / mode->vtotal;
        mode->vtotal = new_vtotal;
}

static void
intel_tv_get_config(struct intel_encoder *encoder,
                    struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct drm_display_mode *adjusted_mode =
                &pipe_config->hw.adjusted_mode;
        struct drm_display_mode mode = {};
        u32 tv_ctl, hctl1, hctl3, vctl1, vctl2, tmp;
        struct tv_mode tv_mode = {};
        int hdisplay = adjusted_mode->crtc_hdisplay;
        int vdisplay = adjusted_mode->crtc_vdisplay;
        int xsize, ysize, xpos, ypos;

        pipe_config->output_types |= BIT(INTEL_OUTPUT_TVOUT);

        tv_ctl = intel_de_read(dev_priv, TV_CTL);
        hctl1 = intel_de_read(dev_priv, TV_H_CTL_1);
        hctl3 = intel_de_read(dev_priv, TV_H_CTL_3);
        vctl1 = intel_de_read(dev_priv, TV_V_CTL_1);
        vctl2 = intel_de_read(dev_priv, TV_V_CTL_2);

        tv_mode.htotal = (hctl1 & TV_HTOTAL_MASK) >> TV_HTOTAL_SHIFT;
        tv_mode.hsync_end = (hctl1 & TV_HSYNC_END_MASK) >> TV_HSYNC_END_SHIFT;

        tv_mode.hblank_start = (hctl3 & TV_HBLANK_START_MASK) >> TV_HBLANK_START_SHIFT;
        tv_mode.hblank_end = (hctl3 & TV_HSYNC_END_MASK) >> TV_HBLANK_END_SHIFT;

        tv_mode.nbr_end = (vctl1 & TV_NBR_END_MASK) >> TV_NBR_END_SHIFT;
        tv_mode.vi_end_f1 = (vctl1 & TV_VI_END_F1_MASK) >> TV_VI_END_F1_SHIFT;
        tv_mode.vi_end_f2 = (vctl1 & TV_VI_END_F2_MASK) >> TV_VI_END_F2_SHIFT;

        tv_mode.vsync_len = (vctl2 & TV_VSYNC_LEN_MASK) >> TV_VSYNC_LEN_SHIFT;
        tv_mode.vsync_start_f1 = (vctl2 & TV_VSYNC_START_F1_MASK) >> TV_VSYNC_START_F1_SHIFT;
        tv_mode.vsync_start_f2 = (vctl2 & TV_VSYNC_START_F2_MASK) >> TV_VSYNC_START_F2_SHIFT;

        tv_mode.clock = pipe_config->port_clock;

        tv_mode.progressive = tv_ctl & TV_PROGRESSIVE;

        switch (tv_ctl & TV_OVERSAMPLE_MASK) {
        case TV_OVERSAMPLE_8X:
                tv_mode.oversample = 8;
                break;
        case TV_OVERSAMPLE_4X:
                tv_mode.oversample = 4;
                break;
        case TV_OVERSAMPLE_2X:
                tv_mode.oversample = 2;
                break;
        default:
                tv_mode.oversample = 1;
                break;
        }

        tmp = intel_de_read(dev_priv, TV_WIN_POS);
        xpos = tmp >> 16;
        ypos = tmp & 0xffff;

        tmp = intel_de_read(dev_priv, TV_WIN_SIZE);
        xsize = tmp >> 16;
        ysize = tmp & 0xffff;

        intel_tv_mode_to_mode(&mode, &tv_mode);

        drm_dbg_kms(&dev_priv->drm, "TV mode:\n");
        drm_mode_debug_printmodeline(&mode);

        intel_tv_scale_mode_horiz(&mode, hdisplay,
                                  xpos, mode.hdisplay - xsize - xpos);
        intel_tv_scale_mode_vert(&mode, vdisplay,
                                 ypos, mode.vdisplay - ysize - ypos);

        adjusted_mode->crtc_clock = mode.clock;
        if (adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE)
                adjusted_mode->crtc_clock /= 2;

        /* pixel counter doesn't work on i965gm TV output */
        if (IS_I965GM(dev_priv))
                adjusted_mode->private_flags |=
                        I915_MODE_FLAG_USE_SCANLINE_COUNTER;
}

static bool intel_tv_source_too_wide(struct drm_i915_private *dev_priv,
                                     int hdisplay)
{
        return IS_GEN(dev_priv, 3) && hdisplay > 1024;
}

static bool intel_tv_vert_scaling(const struct drm_display_mode *tv_mode,
                                  const struct drm_connector_state *conn_state,
                                  int vdisplay)
{
        return tv_mode->crtc_vdisplay -
                conn_state->tv.margins.top -
                conn_state->tv.margins.bottom !=
                vdisplay;
}

static int
intel_tv_compute_config(struct intel_encoder *encoder,
                        struct intel_crtc_state *pipe_config,
                        struct drm_connector_state *conn_state)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_tv_connector_state *tv_conn_state =
                to_intel_tv_connector_state(conn_state);
        const struct tv_mode *tv_mode = intel_tv_mode_find(conn_state);
        struct drm_display_mode *adjusted_mode =
                &pipe_config->hw.adjusted_mode;
        int hdisplay = adjusted_mode->crtc_hdisplay;
        int vdisplay = adjusted_mode->crtc_vdisplay;

        if (!tv_mode)
                return -EINVAL;

        if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
                return -EINVAL;

        pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;

        drm_dbg_kms(&dev_priv->drm, "forcing bpc to 8 for TV\n");
        pipe_config->pipe_bpp = 8*3;

        pipe_config->port_clock = tv_mode->clock;

        intel_tv_mode_to_mode(adjusted_mode, tv_mode);
        drm_mode_set_crtcinfo(adjusted_mode, 0);

        if (intel_tv_source_too_wide(dev_priv, hdisplay) ||
            !intel_tv_vert_scaling(adjusted_mode, conn_state, vdisplay)) {
                int extra, top, bottom;

                extra = adjusted_mode->crtc_vdisplay - vdisplay;

                if (extra < 0) {
                        drm_dbg_kms(&dev_priv->drm,
                                    "No vertical scaling for >1024 pixel wide modes\n");
                        return -EINVAL;
                }

                /* Need to turn off the vertical filter and center the image */

                /* Attempt to maintain the relative sizes of the margins */
                top = conn_state->tv.margins.top;
                bottom = conn_state->tv.margins.bottom;

                if (top + bottom)
                        top = extra * top / (top + bottom);
                else
                        top = extra / 2;
                bottom = extra - top;

                tv_conn_state->margins.top = top;
                tv_conn_state->margins.bottom = bottom;

                tv_conn_state->bypass_vfilter = true;

                if (!tv_mode->progressive) {
                        adjusted_mode->clock /= 2;
                        adjusted_mode->crtc_clock /= 2;
                        adjusted_mode->flags |= DRM_MODE_FLAG_INTERLACE;
                }
        } else {
                tv_conn_state->margins.top = conn_state->tv.margins.top;
                tv_conn_state->margins.bottom = conn_state->tv.margins.bottom;

                tv_conn_state->bypass_vfilter = false;
        }

        drm_dbg_kms(&dev_priv->drm, "TV mode:\n");
        drm_mode_debug_printmodeline(adjusted_mode);

        /*
         * The pipe scanline counter behaviour looks as follows when
         * using the TV encoder:
         *
         * time ->
         *
         * dsl=vtotal-1       |             |
         *                   ||            ||
         *               ___| |        ___| |
         *              /     |       /     |
         *             /      |      /      |
         * dsl=0   ___/       |_____/       |
         *        | | |  |  | |
         *         ^ ^ ^   ^ ^
         *         | | |   | pipe vblank/first part of tv vblank
         *         | | |   bottom margin
         *         | | active
         *         | top margin
         *         remainder of tv vblank
         *
         * When the TV encoder is used the pipe wants to run faster
         * than expected rate. During the active portion the TV
         * encoder stalls the pipe every few lines to keep it in
         * check. When the TV encoder reaches the bottom margin the
         * pipe simply stops. Once we reach the TV vblank the pipe is
         * no longer stalled and it runs at the max rate (apparently
         * oversample clock on gen3, cdclk on gen4). Once the pipe
         * reaches the pipe vtotal the pipe stops for the remainder
         * of the TV vblank/top margin. The pipe starts up again when
         * the TV encoder exits the top margin.
         *
         * To avoid huge hassles for vblank timestamping we scale
         * the pipe timings as if the pipe always runs at the average
         * rate it maintains during the active period. This also
         * gives us a reasonable guesstimate as to the pixel rate.
         * Due to the variation in the actual pipe speed the scanline
         * counter will give us slightly erroneous results during the
         * TV vblank/margins. But since vtotal was selected such that
         * it matches the average rate of the pipe during the active
         * portion the error shouldn't cause any serious grief to
         * vblank timestamps.
         *
         * For posterity here is the empirically derived formula
         * that gives us the maximum length of the pipe vblank
         * we can use without causing display corruption. Following
         * this would allow us to have a ticking scanline counter
         * everywhere except during the bottom margin (there the
         * pipe always stops). Ie. this would eliminate the second
         * flat portion of the above graph. However this would also
         * complicate vblank timestamping as the pipe vtotal would
         * no longer match the average rate the pipe runs at during
         * the active portion. Hence following this formula seems
         * more trouble that it's worth.
         *
         * if (IS_GEN(dev_priv, 4)) {
         *      num = cdclk * (tv_mode->oversample >> !tv_mode->progressive);
         *      den = tv_mode->clock;
         * } else {
         *      num = tv_mode->oversample >> !tv_mode->progressive;
         *      den = 1;
         * }
         * max_pipe_vblank_len ~=
         *      (num * tv_htotal * (tv_vblank_len + top_margin)) /
         *      (den * pipe_htotal);
         */
        intel_tv_scale_mode_horiz(adjusted_mode, hdisplay,
                                  conn_state->tv.margins.left,
                                  conn_state->tv.margins.right);
        intel_tv_scale_mode_vert(adjusted_mode, vdisplay,
                                 tv_conn_state->margins.top,
                                 tv_conn_state->margins.bottom);
        drm_mode_set_crtcinfo(adjusted_mode, 0);
        adjusted_mode->name[0] = '\0';

        /* pixel counter doesn't work on i965gm TV output */
        if (IS_I965GM(dev_priv))
                adjusted_mode->private_flags |=
                        I915_MODE_FLAG_USE_SCANLINE_COUNTER;

        return 0;
}

static void
set_tv_mode_timings(struct drm_i915_private *dev_priv,
                    const struct tv_mode *tv_mode,
                    bool burst_ena)
{
        u32 hctl1, hctl2, hctl3;
        u32 vctl1, vctl2, vctl3, vctl4, vctl5, vctl6, vctl7;

        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);

        intel_de_write(dev_priv, TV_H_CTL_1, hctl1);
        intel_de_write(dev_priv, TV_H_CTL_2, hctl2);
        intel_de_write(dev_priv, TV_H_CTL_3, hctl3);
        intel_de_write(dev_priv, TV_V_CTL_1, vctl1);
        intel_de_write(dev_priv, TV_V_CTL_2, vctl2);
        intel_de_write(dev_priv, TV_V_CTL_3, vctl3);
        intel_de_write(dev_priv, TV_V_CTL_4, vctl4);
        intel_de_write(dev_priv, TV_V_CTL_5, vctl5);
        intel_de_write(dev_priv, TV_V_CTL_6, vctl6);
        intel_de_write(dev_priv, TV_V_CTL_7, vctl7);
}

static void set_color_conversion(struct drm_i915_private *dev_priv,
                                 const struct color_conversion *color_conversion)
{
        if (!color_conversion)
                return;

        intel_de_write(dev_priv, TV_CSC_Y,
                       (color_conversion->ry << 16) | color_conversion->gy);
        intel_de_write(dev_priv, TV_CSC_Y2,
                       (color_conversion->by << 16) | color_conversion->ay);
        intel_de_write(dev_priv, TV_CSC_U,
                       (color_conversion->ru << 16) | color_conversion->gu);
        intel_de_write(dev_priv, TV_CSC_U2,
                       (color_conversion->bu << 16) | color_conversion->au);
        intel_de_write(dev_priv, TV_CSC_V,
                       (color_conversion->rv << 16) | color_conversion->gv);
        intel_de_write(dev_priv, TV_CSC_V2,
                       (color_conversion->bv << 16) | color_conversion->av);
}

static void intel_tv_pre_enable(struct intel_atomic_state *state,
                                struct intel_encoder *encoder,
                                const struct intel_crtc_state *pipe_config,
                                const struct drm_connector_state *conn_state)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_crtc *intel_crtc = to_intel_crtc(pipe_config->uapi.crtc);
        struct intel_tv *intel_tv = enc_to_tv(encoder);
        const struct intel_tv_connector_state *tv_conn_state =
                to_intel_tv_connector_state(conn_state);
        const struct tv_mode *tv_mode = intel_tv_mode_find(conn_state);
        u32 tv_ctl, tv_filter_ctl;
        u32 scctl1, scctl2, scctl3;
        int i, j;
        const struct video_levels *video_levels;
        const struct color_conversion *color_conversion;
        bool burst_ena;
        int xpos, ypos;
        unsigned int xsize, ysize;

        if (!tv_mode)
                return; /* can't happen (mode_prepare prevents this) */

        tv_ctl = intel_de_read(dev_priv, TV_CTL);
        tv_ctl &= TV_CTL_SAVE;

        switch (intel_tv->type) {
        default:
        case DRM_MODE_CONNECTOR_Unknown:
        case DRM_MODE_CONNECTOR_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 DRM_MODE_CONNECTOR_Component:
                tv_ctl |= TV_ENC_OUTPUT_COMPONENT;
                video_levels = &component_levels;
                if (tv_mode->burst_ena)
                        color_conversion = &sdtv_csc_yprpb;
                else
                        color_conversion = &hdtv_csc_yprpb;
                burst_ena = false;
                break;
        case DRM_MODE_CONNECTOR_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;
        }

        tv_ctl |= TV_ENC_PIPE_SEL(intel_crtc->pipe);

        switch (tv_mode->oversample) {
        case 8:
                tv_ctl |= TV_OVERSAMPLE_8X;
                break;
        case 4:
                tv_ctl |= TV_OVERSAMPLE_4X;
                break;
        case 2:
                tv_ctl |= TV_OVERSAMPLE_2X;
                break;
        default:
                tv_ctl |= TV_OVERSAMPLE_NONE;
                break;
        }

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

        scctl1 = 0;
        if (tv_mode->dda1_inc)
                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;
        if (video_levels)
                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 (IS_I915GM(dev_priv))
                tv_ctl |= TV_ENC_C0_FIX | TV_ENC_SDP_FIX;

        set_tv_mode_timings(dev_priv, tv_mode, burst_ena);

        intel_de_write(dev_priv, TV_SC_CTL_1, scctl1);
        intel_de_write(dev_priv, TV_SC_CTL_2, scctl2);
        intel_de_write(dev_priv, TV_SC_CTL_3, scctl3);

        set_color_conversion(dev_priv, color_conversion);

        if (INTEL_GEN(dev_priv) >= 4)
                intel_de_write(dev_priv, TV_CLR_KNOBS, 0x00404000);
        else
                intel_de_write(dev_priv, TV_CLR_KNOBS, 0x00606000);

        if (video_levels)
                intel_de_write(dev_priv, TV_CLR_LEVEL,
                               ((video_levels->black << TV_BLACK_LEVEL_SHIFT) | (video_levels->blank << TV_BLANK_LEVEL_SHIFT)));

        assert_pipe_disabled(dev_priv, pipe_config->cpu_transcoder);

        /* Filter ctl must be set before TV_WIN_SIZE */
        tv_filter_ctl = TV_AUTO_SCALE;
        if (tv_conn_state->bypass_vfilter)
                tv_filter_ctl |= TV_V_FILTER_BYPASS;
        intel_de_write(dev_priv, TV_FILTER_CTL_1, tv_filter_ctl);

        xsize = tv_mode->hblank_start - tv_mode->hblank_end;
        ysize = intel_tv_mode_vdisplay(tv_mode);

        xpos = conn_state->tv.margins.left;
        ypos = tv_conn_state->margins.top;
        xsize -= (conn_state->tv.margins.left +
                  conn_state->tv.margins.right);
        ysize -= (tv_conn_state->margins.top +
                  tv_conn_state->margins.bottom);
        intel_de_write(dev_priv, TV_WIN_POS, (xpos << 16) | ypos);
        intel_de_write(dev_priv, TV_WIN_SIZE, (xsize << 16) | ysize);

        j = 0;
        for (i = 0; i < 60; i++)
                intel_de_write(dev_priv, TV_H_LUMA(i),
                               tv_mode->filter_table[j++]);
        for (i = 0; i < 60; i++)
                intel_de_write(dev_priv, TV_H_CHROMA(i),
                               tv_mode->filter_table[j++]);
        for (i = 0; i < 43; i++)
                intel_de_write(dev_priv, TV_V_LUMA(i),
                               tv_mode->filter_table[j++]);
        for (i = 0; i < 43; i++)
                intel_de_write(dev_priv, TV_V_CHROMA(i),
                               tv_mode->filter_table[j++]);
        intel_de_write(dev_priv, TV_DAC,
                       intel_de_read(dev_priv, TV_DAC) & TV_DAC_SAVE);
        intel_de_write(dev_priv, TV_CTL, tv_ctl);
}

static int
intel_tv_detect_type(struct intel_tv *intel_tv,
                      struct drm_connector *connector)
{
        struct drm_crtc *crtc = connector->state->crtc;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        struct drm_device *dev = connector->dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        u32 tv_ctl, save_tv_ctl;
        u32 tv_dac, save_tv_dac;
        int type;

        /* Disable TV interrupts around load detect or we'll recurse */
        if (connector->polled & DRM_CONNECTOR_POLL_HPD) {
                spin_lock_irq(&dev_priv->irq_lock);
                i915_disable_pipestat(dev_priv, 0,
                                      PIPE_HOTPLUG_INTERRUPT_STATUS |
                                      PIPE_HOTPLUG_TV_INTERRUPT_STATUS);
                spin_unlock_irq(&dev_priv->irq_lock);
        }

        save_tv_dac = tv_dac = intel_de_read(dev_priv, TV_DAC);
        save_tv_ctl = tv_ctl = intel_de_read(dev_priv, TV_CTL);

        /* Poll for TV detection */
        tv_ctl &= ~(TV_ENC_ENABLE | TV_ENC_PIPE_SEL_MASK | TV_TEST_MODE_MASK);
        tv_ctl |= TV_TEST_MODE_MONITOR_DETECT;
        tv_ctl |= TV_ENC_PIPE_SEL(intel_crtc->pipe);

        tv_dac &= ~(TVDAC_SENSE_MASK | DAC_A_MASK | DAC_B_MASK | DAC_C_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);


        /*
         * The TV sense state should be cleared to zero on cantiga platform. Otherwise
         * the TV is misdetected. This is hardware requirement.
         */
        if (IS_GM45(dev_priv))
                tv_dac &= ~(TVDAC_STATE_CHG_EN | TVDAC_A_SENSE_CTL |
                            TVDAC_B_SENSE_CTL | TVDAC_C_SENSE_CTL);

        intel_de_write(dev_priv, TV_CTL, tv_ctl);
        intel_de_write(dev_priv, TV_DAC, tv_dac);
        intel_de_posting_read(dev_priv, TV_DAC);

        intel_wait_for_vblank(dev_priv, intel_crtc->pipe);

        type = -1;
        tv_dac = intel_de_read(dev_priv, TV_DAC);
        drm_dbg_kms(&dev_priv->drm, "TV detected: %x, %x\n", tv_ctl, tv_dac);
        /*
         *  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)) {
                drm_dbg_kms(&dev_priv->drm,
                            "Detected Composite TV connection\n");
                type = DRM_MODE_CONNECTOR_Composite;
        } else if ((tv_dac & (TVDAC_A_SENSE|TVDAC_B_SENSE)) == TVDAC_A_SENSE) {
                drm_dbg_kms(&dev_priv->drm,
                            "Detected S-Video TV connection\n");
                type = DRM_MODE_CONNECTOR_SVIDEO;
        } else if ((tv_dac & TVDAC_SENSE_MASK) == 0) {
                drm_dbg_kms(&dev_priv->drm,
                            "Detected Component TV connection\n");
                type = DRM_MODE_CONNECTOR_Component;
        } else {
                drm_dbg_kms(&dev_priv->drm, "Unrecognised TV connection\n");
                type = -1;
        }

        intel_de_write(dev_priv, TV_DAC, save_tv_dac & ~TVDAC_STATE_CHG_EN);
        intel_de_write(dev_priv, TV_CTL, save_tv_ctl);
        intel_de_posting_read(dev_priv, TV_CTL);

        /* For unknown reasons the hw barfs if we don't do this vblank wait. */
        intel_wait_for_vblank(dev_priv, intel_crtc->pipe);

        /* Restore interrupt config */
        if (connector->polled & DRM_CONNECTOR_POLL_HPD) {
                spin_lock_irq(&dev_priv->irq_lock);
                i915_enable_pipestat(dev_priv, 0,
                                     PIPE_HOTPLUG_INTERRUPT_STATUS |
                                     PIPE_HOTPLUG_TV_INTERRUPT_STATUS);
                spin_unlock_irq(&dev_priv->irq_lock);
        }

        return type;
}

/*
 * Here we set accurate tv format according to connector type
 * i.e Component TV should not be assigned by NTSC or PAL
 */
static void intel_tv_find_better_format(struct drm_connector *connector)
{
        struct intel_tv *intel_tv = intel_attached_tv(to_intel_connector(connector));
        const struct tv_mode *tv_mode = intel_tv_mode_find(connector->state);
        int i;

        /* Component supports everything so we can keep the current mode */
        if (intel_tv->type == DRM_MODE_CONNECTOR_Component)
                return;

        /* If the current mode is fine don't change it */
        if (!tv_mode->component_only)
                return;

        for (i = 0; i < ARRAY_SIZE(tv_modes); i++) {
                tv_mode = &tv_modes[i];

                if (!tv_mode->component_only)
                        break;
        }

        connector->state->tv.mode = i;
}

static int
intel_tv_detect(struct drm_connector *connector,
                struct drm_modeset_acquire_ctx *ctx,
                bool force)
{
        struct drm_i915_private *i915 = to_i915(connector->dev);
        struct intel_tv *intel_tv = intel_attached_tv(to_intel_connector(connector));
        enum drm_connector_status status;
        int type;

        drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] force=%d\n",
                    connector->base.id, connector->name, force);

        if (force) {
                struct intel_load_detect_pipe tmp;
                int ret;

                ret = intel_get_load_detect_pipe(connector, &tmp, ctx);
                if (ret < 0)
                        return ret;

                if (ret > 0) {
                        type = intel_tv_detect_type(intel_tv, connector);
                        intel_release_load_detect_pipe(connector, &tmp, ctx);
                        status = type < 0 ?
                                connector_status_disconnected :
                                connector_status_connected;
                } else
                        status = connector_status_unknown;

                if (status == connector_status_connected) {
                        intel_tv->type = type;
                        intel_tv_find_better_format(connector);
                }

                return status;
        } else
                return connector->status;
}

static const struct input_res {
        u16 w, h;
} input_res_table[] = {
        { 640, 480 },
        { 800, 600 },
        { 1024, 768 },
        { 1280, 1024 },
        { 848, 480 },
        { 1280, 720 },
        { 1920, 1080 },
};

/* Choose preferred mode according to line number of TV format */
static bool
intel_tv_is_preferred_mode(const struct drm_display_mode *mode,
                           const struct tv_mode *tv_mode)
{
        int vdisplay = intel_tv_mode_vdisplay(tv_mode);

        /* prefer 480 line modes for all SD TV modes */
        if (vdisplay <= 576)
                vdisplay = 480;

        return vdisplay == mode->vdisplay;
}

static void
intel_tv_set_mode_type(struct drm_display_mode *mode,
                       const struct tv_mode *tv_mode)
{
        mode->type = DRM_MODE_TYPE_DRIVER;

        if (intel_tv_is_preferred_mode(mode, tv_mode))
                mode->type |= DRM_MODE_TYPE_PREFERRED;
}

static int
intel_tv_get_modes(struct drm_connector *connector)
{
        struct drm_i915_private *dev_priv = to_i915(connector->dev);
        const struct tv_mode *tv_mode = intel_tv_mode_find(connector->state);
        int i, count = 0;

        for (i = 0; i < ARRAY_SIZE(input_res_table); i++) {
                const struct input_res *input = &input_res_table[i];
                struct drm_display_mode *mode;

                if (input->w > 1024 &&
                    !tv_mode->progressive &&
                    !tv_mode->component_only)
                        continue;

                /* no vertical scaling with wide sources on gen3 */
                if (IS_GEN(dev_priv, 3) && input->w > 1024 &&
                    input->h > intel_tv_mode_vdisplay(tv_mode))
                        continue;

                mode = drm_mode_create(connector->dev);
                if (!mode)
                        continue;

                /*
                 * We take the TV mode and scale it to look
                 * like it had the expected h/vdisplay. This
                 * provides the most information to userspace
                 * about the actual timings of the mode. We
                 * do ignore the margins though.
                 */
                intel_tv_mode_to_mode(mode, tv_mode);
                if (count == 0) {
                        drm_dbg_kms(&dev_priv->drm, "TV mode:\n");
                        drm_mode_debug_printmodeline(mode);
                }
                intel_tv_scale_mode_horiz(mode, input->w, 0, 0);
                intel_tv_scale_mode_vert(mode, input->h, 0, 0);
                intel_tv_set_mode_type(mode, tv_mode);

                drm_mode_set_name(mode);

                drm_mode_probed_add(connector, mode);
                count++;
        }

        return count;
}

static const struct drm_connector_funcs intel_tv_connector_funcs = {
        .late_register = intel_connector_register,
        .early_unregister = intel_connector_unregister,
        .destroy = intel_connector_destroy,
        .fill_modes = drm_helper_probe_single_connector_modes,
        .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
        .atomic_duplicate_state = intel_tv_connector_duplicate_state,
};

static int intel_tv_atomic_check(struct drm_connector *connector,
                                 struct drm_atomic_state *state)
{
        struct drm_connector_state *new_state;
        struct drm_crtc_state *new_crtc_state;
        struct drm_connector_state *old_state;

        new_state = drm_atomic_get_new_connector_state(state, connector);
        if (!new_state->crtc)
                return 0;

        old_state = drm_atomic_get_old_connector_state(state, connector);
        new_crtc_state = drm_atomic_get_new_crtc_state(state, new_state->crtc);

        if (old_state->tv.mode != new_state->tv.mode ||
            old_state->tv.margins.left != new_state->tv.margins.left ||
            old_state->tv.margins.right != new_state->tv.margins.right ||
            old_state->tv.margins.top != new_state->tv.margins.top ||
            old_state->tv.margins.bottom != new_state->tv.margins.bottom) {
                /* Force a modeset. */

                new_crtc_state->connectors_changed = true;
        }

        return 0;
}

static const struct drm_connector_helper_funcs intel_tv_connector_helper_funcs = {
        .detect_ctx = intel_tv_detect,
        .mode_valid = intel_tv_mode_valid,
        .get_modes = intel_tv_get_modes,
        .atomic_check = intel_tv_atomic_check,
};

static const struct drm_encoder_funcs intel_tv_enc_funcs = {
        .destroy = intel_encoder_destroy,
};

void
intel_tv_init(struct drm_i915_private *dev_priv)
{
        struct drm_device *dev = &dev_priv->drm;
        struct drm_connector *connector;
        struct intel_tv *intel_tv;
        struct intel_encoder *intel_encoder;
        struct intel_connector *intel_connector;
        u32 tv_dac_on, tv_dac_off, save_tv_dac;
        const char *tv_format_names[ARRAY_SIZE(tv_modes)];
        int i, initial_mode = 0;
        struct drm_connector_state *state;

        if ((intel_de_read(dev_priv, TV_CTL) & TV_FUSE_STATE_MASK) == TV_FUSE_STATE_DISABLED)
                return;

        if (!intel_bios_is_tv_present(dev_priv)) {
                drm_dbg_kms(&dev_priv->drm, "Integrated TV is not present.\n");
                return;
        }

        /*
         * Sanity check the TV output by checking to see if the
         * DAC register holds a value
         */
        save_tv_dac = intel_de_read(dev_priv, TV_DAC);

        intel_de_write(dev_priv, TV_DAC, save_tv_dac | TVDAC_STATE_CHG_EN);
        tv_dac_on = intel_de_read(dev_priv, TV_DAC);

        intel_de_write(dev_priv, TV_DAC, save_tv_dac & ~TVDAC_STATE_CHG_EN);
        tv_dac_off = intel_de_read(dev_priv, TV_DAC);

        intel_de_write(dev_priv, 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;

        intel_tv = kzalloc(sizeof(*intel_tv), GFP_KERNEL);
        if (!intel_tv) {
                return;
        }

        intel_connector = intel_connector_alloc();
        if (!intel_connector) {
                kfree(intel_tv);
                return;
        }

        intel_encoder = &intel_tv->base;
        connector = &intel_connector->base;
        state = connector->state;

        /*
         * The documentation, for the older chipsets at least, recommend
         * using a polling method rather than hotplug detection for TVs.
         * This is because in order to perform the hotplug detection, the PLLs
         * for the TV must be kept alive increasing power drain and starving
         * bandwidth from other encoders. Notably for instance, it causes
         * pipe underruns on Crestline when this encoder is supposedly idle.
         *
         * More recent chipsets favour HDMI rather than integrated S-Video.
         */
        intel_connector->polled = DRM_CONNECTOR_POLL_CONNECT;

        drm_connector_init(dev, connector, &intel_tv_connector_funcs,
                           DRM_MODE_CONNECTOR_SVIDEO);

        drm_encoder_init(dev, &intel_encoder->base, &intel_tv_enc_funcs,
                         DRM_MODE_ENCODER_TVDAC, "TV");

        intel_encoder->compute_config = intel_tv_compute_config;
        intel_encoder->get_config = intel_tv_get_config;
        intel_encoder->pre_enable = intel_tv_pre_enable;
        intel_encoder->enable = intel_enable_tv;
        intel_encoder->disable = intel_disable_tv;
        intel_encoder->get_hw_state = intel_tv_get_hw_state;
        intel_connector->get_hw_state = intel_connector_get_hw_state;

        intel_connector_attach_encoder(intel_connector, intel_encoder);

        intel_encoder->type = INTEL_OUTPUT_TVOUT;
        intel_encoder->power_domain = POWER_DOMAIN_PORT_OTHER;
        intel_encoder->port = PORT_NONE;
        intel_encoder->pipe_mask = ~0;
        intel_encoder->cloneable = 0;
        intel_tv->type = DRM_MODE_CONNECTOR_Unknown;

        /* BIOS margin values */
        state->tv.margins.left = 54;
        state->tv.margins.top = 36;
        state->tv.margins.right = 46;
        state->tv.margins.bottom = 37;

        state->tv.mode = initial_mode;

        drm_connector_helper_add(connector, &intel_tv_connector_helper_funcs);
        connector->interlace_allowed = false;
        connector->doublescan_allowed = false;

        /* Create TV properties then attach current values */
        for (i = 0; i < ARRAY_SIZE(tv_modes); i++) {
                /* 1080p50/1080p60 not supported on gen3 */
                if (IS_GEN(dev_priv, 3) &&
                    tv_modes[i].oversample == 1)
                        break;

                tv_format_names[i] = tv_modes[i].name;
        }
        drm_mode_create_tv_properties(dev, i, tv_format_names);

        drm_object_attach_property(&connector->base, dev->mode_config.tv_mode_property,
                                   state->tv.mode);
        drm_object_attach_property(&connector->base,
                                   dev->mode_config.tv_left_margin_property,
                                   state->tv.margins.left);
        drm_object_attach_property(&connector->base,
                                   dev->mode_config.tv_top_margin_property,
                                   state->tv.margins.top);
        drm_object_attach_property(&connector->base,
                                   dev->mode_config.tv_right_margin_property,
                                   state->tv.margins.right);
        drm_object_attach_property(&connector->base,

                                   dev->mode_config.tv_bottom_margin_property,
                                   state->tv.margins.bottom);
}