Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg...

[mirror_ubuntu-artful-kernel.git] / drivers / gpu / drm / i915 / intel_display.c

/*
 * Copyright © 2006-2007 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>
 */

#include <linux/i2c.h>
#include "drmP.h"
#include "intel_drv.h"
#include "i915_drm.h"
#include "i915_drv.h"

#include "drm_crtc_helper.h"

bool intel_pipe_has_type (struct drm_crtc *crtc, int type);

typedef struct {
    /* given values */
    int n;
    int m1, m2;
    int p1, p2;
    /* derived values */
    int dot;
    int vco;
    int m;
    int p;
} intel_clock_t;

typedef struct {
    int min, max;
} intel_range_t;

typedef struct {
    int dot_limit;
    int p2_slow, p2_fast;
} intel_p2_t;

#define INTEL_P2_NUM                  2
typedef struct intel_limit intel_limit_t;
struct intel_limit {
    intel_range_t   dot, vco, n, m, m1, m2, p, p1;
    intel_p2_t      p2;
    bool (* find_pll)(const intel_limit_t *, struct drm_crtc *,
                      int, int, intel_clock_t *);
};

#define I8XX_DOT_MIN              25000
#define I8XX_DOT_MAX             350000
#define I8XX_VCO_MIN             930000
#define I8XX_VCO_MAX            1400000
#define I8XX_N_MIN                    3
#define I8XX_N_MAX                   16
#define I8XX_M_MIN                   96
#define I8XX_M_MAX                  140
#define I8XX_M1_MIN                  18
#define I8XX_M1_MAX                  26
#define I8XX_M2_MIN                   6
#define I8XX_M2_MAX                  16
#define I8XX_P_MIN                    4
#define I8XX_P_MAX                  128
#define I8XX_P1_MIN                   2
#define I8XX_P1_MAX                  33
#define I8XX_P1_LVDS_MIN              1
#define I8XX_P1_LVDS_MAX              6
#define I8XX_P2_SLOW                  4
#define I8XX_P2_FAST                  2
#define I8XX_P2_LVDS_SLOW             14
#define I8XX_P2_LVDS_FAST             14 /* No fast option */
#define I8XX_P2_SLOW_LIMIT       165000

#define I9XX_DOT_MIN              20000
#define I9XX_DOT_MAX             400000
#define I9XX_VCO_MIN            1400000
#define I9XX_VCO_MAX            2800000
#define IGD_VCO_MIN             1700000
#define IGD_VCO_MAX             3500000
#define I9XX_N_MIN                    1
#define I9XX_N_MAX                    6
/* IGD's Ncounter is a ring counter */
#define IGD_N_MIN                     3
#define IGD_N_MAX                     6
#define I9XX_M_MIN                   70
#define I9XX_M_MAX                  120
#define IGD_M_MIN                     2
#define IGD_M_MAX                   256
#define I9XX_M1_MIN                  10
#define I9XX_M1_MAX                  22
#define I9XX_M2_MIN                   5
#define I9XX_M2_MAX                   9
/* IGD M1 is reserved, and must be 0 */
#define IGD_M1_MIN                    0
#define IGD_M1_MAX                    0
#define IGD_M2_MIN                    0
#define IGD_M2_MAX                    254
#define I9XX_P_SDVO_DAC_MIN           5
#define I9XX_P_SDVO_DAC_MAX          80
#define I9XX_P_LVDS_MIN               7
#define I9XX_P_LVDS_MAX              98
#define IGD_P_LVDS_MIN                7
#define IGD_P_LVDS_MAX               112
#define I9XX_P1_MIN                   1
#define I9XX_P1_MAX                   8
#define I9XX_P2_SDVO_DAC_SLOW                10
#define I9XX_P2_SDVO_DAC_FAST                 5
#define I9XX_P2_SDVO_DAC_SLOW_LIMIT      200000
#define I9XX_P2_LVDS_SLOW                    14
#define I9XX_P2_LVDS_FAST                     7
#define I9XX_P2_LVDS_SLOW_LIMIT          112000

#define INTEL_LIMIT_I8XX_DVO_DAC    0
#define INTEL_LIMIT_I8XX_LVDS       1
#define INTEL_LIMIT_I9XX_SDVO_DAC   2
#define INTEL_LIMIT_I9XX_LVDS       3
#define INTEL_LIMIT_G4X_SDVO        4
#define INTEL_LIMIT_G4X_HDMI_DAC   5
#define INTEL_LIMIT_G4X_SINGLE_CHANNEL_LVDS   6
#define INTEL_LIMIT_G4X_DUAL_CHANNEL_LVDS   7
#define INTEL_LIMIT_IGD_SDVO_DAC    8
#define INTEL_LIMIT_IGD_LVDS        9

/*The parameter is for SDVO on G4x platform*/
#define G4X_DOT_SDVO_MIN           25000
#define G4X_DOT_SDVO_MAX           270000
#define G4X_VCO_MIN                1750000
#define G4X_VCO_MAX                3500000
#define G4X_N_SDVO_MIN             1
#define G4X_N_SDVO_MAX             4
#define G4X_M_SDVO_MIN             104
#define G4X_M_SDVO_MAX             138
#define G4X_M1_SDVO_MIN            17
#define G4X_M1_SDVO_MAX            23
#define G4X_M2_SDVO_MIN            5
#define G4X_M2_SDVO_MAX            11
#define G4X_P_SDVO_MIN             10
#define G4X_P_SDVO_MAX             30
#define G4X_P1_SDVO_MIN            1
#define G4X_P1_SDVO_MAX            3
#define G4X_P2_SDVO_SLOW           10
#define G4X_P2_SDVO_FAST           10
#define G4X_P2_SDVO_LIMIT          270000

/*The parameter is for HDMI_DAC on G4x platform*/
#define G4X_DOT_HDMI_DAC_MIN           22000
#define G4X_DOT_HDMI_DAC_MAX           400000
#define G4X_N_HDMI_DAC_MIN             1
#define G4X_N_HDMI_DAC_MAX             4
#define G4X_M_HDMI_DAC_MIN             104
#define G4X_M_HDMI_DAC_MAX             138
#define G4X_M1_HDMI_DAC_MIN            16
#define G4X_M1_HDMI_DAC_MAX            23
#define G4X_M2_HDMI_DAC_MIN            5
#define G4X_M2_HDMI_DAC_MAX            11
#define G4X_P_HDMI_DAC_MIN             5
#define G4X_P_HDMI_DAC_MAX             80
#define G4X_P1_HDMI_DAC_MIN            1
#define G4X_P1_HDMI_DAC_MAX            8
#define G4X_P2_HDMI_DAC_SLOW           10
#define G4X_P2_HDMI_DAC_FAST           5
#define G4X_P2_HDMI_DAC_LIMIT          165000

/*The parameter is for SINGLE_CHANNEL_LVDS on G4x platform*/
#define G4X_DOT_SINGLE_CHANNEL_LVDS_MIN           20000
#define G4X_DOT_SINGLE_CHANNEL_LVDS_MAX           115000
#define G4X_N_SINGLE_CHANNEL_LVDS_MIN             1
#define G4X_N_SINGLE_CHANNEL_LVDS_MAX             3
#define G4X_M_SINGLE_CHANNEL_LVDS_MIN             104
#define G4X_M_SINGLE_CHANNEL_LVDS_MAX             138
#define G4X_M1_SINGLE_CHANNEL_LVDS_MIN            17
#define G4X_M1_SINGLE_CHANNEL_LVDS_MAX            23
#define G4X_M2_SINGLE_CHANNEL_LVDS_MIN            5
#define G4X_M2_SINGLE_CHANNEL_LVDS_MAX            11
#define G4X_P_SINGLE_CHANNEL_LVDS_MIN             28
#define G4X_P_SINGLE_CHANNEL_LVDS_MAX             112
#define G4X_P1_SINGLE_CHANNEL_LVDS_MIN            2
#define G4X_P1_SINGLE_CHANNEL_LVDS_MAX            8
#define G4X_P2_SINGLE_CHANNEL_LVDS_SLOW           14
#define G4X_P2_SINGLE_CHANNEL_LVDS_FAST           14
#define G4X_P2_SINGLE_CHANNEL_LVDS_LIMIT          0

/*The parameter is for DUAL_CHANNEL_LVDS on G4x platform*/
#define G4X_DOT_DUAL_CHANNEL_LVDS_MIN           80000
#define G4X_DOT_DUAL_CHANNEL_LVDS_MAX           224000
#define G4X_N_DUAL_CHANNEL_LVDS_MIN             1
#define G4X_N_DUAL_CHANNEL_LVDS_MAX             3
#define G4X_M_DUAL_CHANNEL_LVDS_MIN             104
#define G4X_M_DUAL_CHANNEL_LVDS_MAX             138
#define G4X_M1_DUAL_CHANNEL_LVDS_MIN            17
#define G4X_M1_DUAL_CHANNEL_LVDS_MAX            23
#define G4X_M2_DUAL_CHANNEL_LVDS_MIN            5
#define G4X_M2_DUAL_CHANNEL_LVDS_MAX            11
#define G4X_P_DUAL_CHANNEL_LVDS_MIN             14
#define G4X_P_DUAL_CHANNEL_LVDS_MAX             42
#define G4X_P1_DUAL_CHANNEL_LVDS_MIN            2
#define G4X_P1_DUAL_CHANNEL_LVDS_MAX            6
#define G4X_P2_DUAL_CHANNEL_LVDS_SLOW           7
#define G4X_P2_DUAL_CHANNEL_LVDS_FAST           7
#define G4X_P2_DUAL_CHANNEL_LVDS_LIMIT          0

static bool
intel_find_best_PLL(const intel_limit_t *limit, struct drm_crtc *crtc,
                    int target, int refclk, intel_clock_t *best_clock);
static bool
intel_g4x_find_best_PLL(const intel_limit_t *limit, struct drm_crtc *crtc,
                        int target, int refclk, intel_clock_t *best_clock);

static const intel_limit_t intel_limits[] = {
    { /* INTEL_LIMIT_I8XX_DVO_DAC */
        .dot = { .min = I8XX_DOT_MIN,           .max = I8XX_DOT_MAX },
        .vco = { .min = I8XX_VCO_MIN,           .max = I8XX_VCO_MAX },
        .n   = { .min = I8XX_N_MIN,             .max = I8XX_N_MAX },
        .m   = { .min = I8XX_M_MIN,             .max = I8XX_M_MAX },
        .m1  = { .min = I8XX_M1_MIN,            .max = I8XX_M1_MAX },
        .m2  = { .min = I8XX_M2_MIN,            .max = I8XX_M2_MAX },
        .p   = { .min = I8XX_P_MIN,             .max = I8XX_P_MAX },
        .p1  = { .min = I8XX_P1_MIN,            .max = I8XX_P1_MAX },
        .p2  = { .dot_limit = I8XX_P2_SLOW_LIMIT,
                 .p2_slow = I8XX_P2_SLOW,       .p2_fast = I8XX_P2_FAST },
        .find_pll = intel_find_best_PLL,
    },
    { /* INTEL_LIMIT_I8XX_LVDS */
        .dot = { .min = I8XX_DOT_MIN,           .max = I8XX_DOT_MAX },
        .vco = { .min = I8XX_VCO_MIN,           .max = I8XX_VCO_MAX },
        .n   = { .min = I8XX_N_MIN,             .max = I8XX_N_MAX },
        .m   = { .min = I8XX_M_MIN,             .max = I8XX_M_MAX },
        .m1  = { .min = I8XX_M1_MIN,            .max = I8XX_M1_MAX },
        .m2  = { .min = I8XX_M2_MIN,            .max = I8XX_M2_MAX },
        .p   = { .min = I8XX_P_MIN,             .max = I8XX_P_MAX },
        .p1  = { .min = I8XX_P1_LVDS_MIN,       .max = I8XX_P1_LVDS_MAX },
        .p2  = { .dot_limit = I8XX_P2_SLOW_LIMIT,
                 .p2_slow = I8XX_P2_LVDS_SLOW,  .p2_fast = I8XX_P2_LVDS_FAST },
        .find_pll = intel_find_best_PLL,
    },
    { /* INTEL_LIMIT_I9XX_SDVO_DAC */
        .dot = { .min = I9XX_DOT_MIN,           .max = I9XX_DOT_MAX },
        .vco = { .min = I9XX_VCO_MIN,           .max = I9XX_VCO_MAX },
        .n   = { .min = I9XX_N_MIN,             .max = I9XX_N_MAX },
        .m   = { .min = I9XX_M_MIN,             .max = I9XX_M_MAX },
        .m1  = { .min = I9XX_M1_MIN,            .max = I9XX_M1_MAX },
        .m2  = { .min = I9XX_M2_MIN,            .max = I9XX_M2_MAX },
        .p   = { .min = I9XX_P_SDVO_DAC_MIN,    .max = I9XX_P_SDVO_DAC_MAX },
        .p1  = { .min = I9XX_P1_MIN,            .max = I9XX_P1_MAX },
        .p2  = { .dot_limit = I9XX_P2_SDVO_DAC_SLOW_LIMIT,
                 .p2_slow = I9XX_P2_SDVO_DAC_SLOW,      .p2_fast = I9XX_P2_SDVO_DAC_FAST },
        .find_pll = intel_find_best_PLL,
    },
    { /* INTEL_LIMIT_I9XX_LVDS */
        .dot = { .min = I9XX_DOT_MIN,           .max = I9XX_DOT_MAX },
        .vco = { .min = I9XX_VCO_MIN,           .max = I9XX_VCO_MAX },
        .n   = { .min = I9XX_N_MIN,             .max = I9XX_N_MAX },
        .m   = { .min = I9XX_M_MIN,             .max = I9XX_M_MAX },
        .m1  = { .min = I9XX_M1_MIN,            .max = I9XX_M1_MAX },
        .m2  = { .min = I9XX_M2_MIN,            .max = I9XX_M2_MAX },
        .p   = { .min = I9XX_P_LVDS_MIN,        .max = I9XX_P_LVDS_MAX },
        .p1  = { .min = I9XX_P1_MIN,            .max = I9XX_P1_MAX },
        /* The single-channel range is 25-112Mhz, and dual-channel
         * is 80-224Mhz.  Prefer single channel as much as possible.
         */
        .p2  = { .dot_limit = I9XX_P2_LVDS_SLOW_LIMIT,
                 .p2_slow = I9XX_P2_LVDS_SLOW,  .p2_fast = I9XX_P2_LVDS_FAST },
        .find_pll = intel_find_best_PLL,
    },
    /* below parameter and function is for G4X Chipset Family*/
    { /* INTEL_LIMIT_G4X_SDVO */
        .dot = { .min = G4X_DOT_SDVO_MIN,       .max = G4X_DOT_SDVO_MAX },
        .vco = { .min = G4X_VCO_MIN,            .max = G4X_VCO_MAX},
        .n   = { .min = G4X_N_SDVO_MIN,         .max = G4X_N_SDVO_MAX },
        .m   = { .min = G4X_M_SDVO_MIN,         .max = G4X_M_SDVO_MAX },
        .m1  = { .min = G4X_M1_SDVO_MIN,        .max = G4X_M1_SDVO_MAX },
        .m2  = { .min = G4X_M2_SDVO_MIN,        .max = G4X_M2_SDVO_MAX },
        .p   = { .min = G4X_P_SDVO_MIN,         .max = G4X_P_SDVO_MAX },
        .p1  = { .min = G4X_P1_SDVO_MIN,        .max = G4X_P1_SDVO_MAX},
        .p2  = { .dot_limit = G4X_P2_SDVO_LIMIT,
                 .p2_slow = G4X_P2_SDVO_SLOW,
                 .p2_fast = G4X_P2_SDVO_FAST
        },
        .find_pll = intel_g4x_find_best_PLL,
    },
    { /* INTEL_LIMIT_G4X_HDMI_DAC */
        .dot = { .min = G4X_DOT_HDMI_DAC_MIN,   .max = G4X_DOT_HDMI_DAC_MAX },
        .vco = { .min = G4X_VCO_MIN,            .max = G4X_VCO_MAX},
        .n   = { .min = G4X_N_HDMI_DAC_MIN,     .max = G4X_N_HDMI_DAC_MAX },
        .m   = { .min = G4X_M_HDMI_DAC_MIN,     .max = G4X_M_HDMI_DAC_MAX },
        .m1  = { .min = G4X_M1_HDMI_DAC_MIN,    .max = G4X_M1_HDMI_DAC_MAX },
        .m2  = { .min = G4X_M2_HDMI_DAC_MIN,    .max = G4X_M2_HDMI_DAC_MAX },
        .p   = { .min = G4X_P_HDMI_DAC_MIN,     .max = G4X_P_HDMI_DAC_MAX },
        .p1  = { .min = G4X_P1_HDMI_DAC_MIN,    .max = G4X_P1_HDMI_DAC_MAX},
        .p2  = { .dot_limit = G4X_P2_HDMI_DAC_LIMIT,
                 .p2_slow = G4X_P2_HDMI_DAC_SLOW,
                 .p2_fast = G4X_P2_HDMI_DAC_FAST
        },
        .find_pll = intel_g4x_find_best_PLL,
    },
    { /* INTEL_LIMIT_G4X_SINGLE_CHANNEL_LVDS */
        .dot = { .min = G4X_DOT_SINGLE_CHANNEL_LVDS_MIN,
                 .max = G4X_DOT_SINGLE_CHANNEL_LVDS_MAX },
        .vco = { .min = G4X_VCO_MIN,
                 .max = G4X_VCO_MAX },
        .n   = { .min = G4X_N_SINGLE_CHANNEL_LVDS_MIN,
                 .max = G4X_N_SINGLE_CHANNEL_LVDS_MAX },
        .m   = { .min = G4X_M_SINGLE_CHANNEL_LVDS_MIN,
                 .max = G4X_M_SINGLE_CHANNEL_LVDS_MAX },
        .m1  = { .min = G4X_M1_SINGLE_CHANNEL_LVDS_MIN,
                 .max = G4X_M1_SINGLE_CHANNEL_LVDS_MAX },
        .m2  = { .min = G4X_M2_SINGLE_CHANNEL_LVDS_MIN,
                 .max = G4X_M2_SINGLE_CHANNEL_LVDS_MAX },
        .p   = { .min = G4X_P_SINGLE_CHANNEL_LVDS_MIN,
                 .max = G4X_P_SINGLE_CHANNEL_LVDS_MAX },
        .p1  = { .min = G4X_P1_SINGLE_CHANNEL_LVDS_MIN,
                 .max = G4X_P1_SINGLE_CHANNEL_LVDS_MAX },
        .p2  = { .dot_limit = G4X_P2_SINGLE_CHANNEL_LVDS_LIMIT,
                 .p2_slow = G4X_P2_SINGLE_CHANNEL_LVDS_SLOW,
                 .p2_fast = G4X_P2_SINGLE_CHANNEL_LVDS_FAST
        },
        .find_pll = intel_g4x_find_best_PLL,
    },
    { /* INTEL_LIMIT_G4X_DUAL_CHANNEL_LVDS */
        .dot = { .min = G4X_DOT_DUAL_CHANNEL_LVDS_MIN,
                 .max = G4X_DOT_DUAL_CHANNEL_LVDS_MAX },
        .vco = { .min = G4X_VCO_MIN,
                 .max = G4X_VCO_MAX },
        .n   = { .min = G4X_N_DUAL_CHANNEL_LVDS_MIN,
                 .max = G4X_N_DUAL_CHANNEL_LVDS_MAX },
        .m   = { .min = G4X_M_DUAL_CHANNEL_LVDS_MIN,
                 .max = G4X_M_DUAL_CHANNEL_LVDS_MAX },
        .m1  = { .min = G4X_M1_DUAL_CHANNEL_LVDS_MIN,
                 .max = G4X_M1_DUAL_CHANNEL_LVDS_MAX },
        .m2  = { .min = G4X_M2_DUAL_CHANNEL_LVDS_MIN,
                 .max = G4X_M2_DUAL_CHANNEL_LVDS_MAX },
        .p   = { .min = G4X_P_DUAL_CHANNEL_LVDS_MIN,
                 .max = G4X_P_DUAL_CHANNEL_LVDS_MAX },
        .p1  = { .min = G4X_P1_DUAL_CHANNEL_LVDS_MIN,
                 .max = G4X_P1_DUAL_CHANNEL_LVDS_MAX },
        .p2  = { .dot_limit = G4X_P2_DUAL_CHANNEL_LVDS_LIMIT,
                 .p2_slow = G4X_P2_DUAL_CHANNEL_LVDS_SLOW,
                 .p2_fast = G4X_P2_DUAL_CHANNEL_LVDS_FAST
        },
        .find_pll = intel_g4x_find_best_PLL,
    },
    { /* INTEL_LIMIT_IGD_SDVO */
        .dot = { .min = I9XX_DOT_MIN,           .max = I9XX_DOT_MAX},
        .vco = { .min = IGD_VCO_MIN,            .max = IGD_VCO_MAX },
        .n   = { .min = IGD_N_MIN,              .max = IGD_N_MAX },
        .m   = { .min = IGD_M_MIN,              .max = IGD_M_MAX },
        .m1  = { .min = IGD_M1_MIN,             .max = IGD_M1_MAX },
        .m2  = { .min = IGD_M2_MIN,             .max = IGD_M2_MAX },
        .p   = { .min = I9XX_P_SDVO_DAC_MIN,    .max = I9XX_P_SDVO_DAC_MAX },
        .p1  = { .min = I9XX_P1_MIN,            .max = I9XX_P1_MAX },
        .p2  = { .dot_limit = I9XX_P2_SDVO_DAC_SLOW_LIMIT,
                 .p2_slow = I9XX_P2_SDVO_DAC_SLOW,      .p2_fast = I9XX_P2_SDVO_DAC_FAST },
        .find_pll = intel_find_best_PLL,
    },
    { /* INTEL_LIMIT_IGD_LVDS */
        .dot = { .min = I9XX_DOT_MIN,           .max = I9XX_DOT_MAX },
        .vco = { .min = IGD_VCO_MIN,            .max = IGD_VCO_MAX },
        .n   = { .min = IGD_N_MIN,              .max = IGD_N_MAX },
        .m   = { .min = IGD_M_MIN,              .max = IGD_M_MAX },
        .m1  = { .min = IGD_M1_MIN,             .max = IGD_M1_MAX },
        .m2  = { .min = IGD_M2_MIN,             .max = IGD_M2_MAX },
        .p   = { .min = IGD_P_LVDS_MIN, .max = IGD_P_LVDS_MAX },
        .p1  = { .min = I9XX_P1_MIN,            .max = I9XX_P1_MAX },
        /* IGD only supports single-channel mode. */
        .p2  = { .dot_limit = I9XX_P2_LVDS_SLOW_LIMIT,
                 .p2_slow = I9XX_P2_LVDS_SLOW,  .p2_fast = I9XX_P2_LVDS_SLOW },
        .find_pll = intel_find_best_PLL,
    },

};

static const intel_limit_t *intel_g4x_limit(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        const intel_limit_t *limit;

        if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS)) {
                if ((I915_READ(LVDS) & LVDS_CLKB_POWER_MASK) ==
                    LVDS_CLKB_POWER_UP)
                        /* LVDS with dual channel */
                        limit = &intel_limits
                                        [INTEL_LIMIT_G4X_DUAL_CHANNEL_LVDS];
                else
                        /* LVDS with dual channel */
                        limit = &intel_limits
                                        [INTEL_LIMIT_G4X_SINGLE_CHANNEL_LVDS];
        } else if (intel_pipe_has_type(crtc, INTEL_OUTPUT_HDMI) ||
                   intel_pipe_has_type(crtc, INTEL_OUTPUT_ANALOG)) {
                limit = &intel_limits[INTEL_LIMIT_G4X_HDMI_DAC];
        } else if (intel_pipe_has_type(crtc, INTEL_OUTPUT_SDVO)) {
                limit = &intel_limits[INTEL_LIMIT_G4X_SDVO];
        } else /* The option is for other outputs */
                limit = &intel_limits[INTEL_LIMIT_I9XX_SDVO_DAC];

        return limit;
}

static const intel_limit_t *intel_limit(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        const intel_limit_t *limit;

        if (IS_G4X(dev)) {
                limit = intel_g4x_limit(crtc);
        } else if (IS_I9XX(dev) && !IS_IGD(dev)) {
                if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS))
                        limit = &intel_limits[INTEL_LIMIT_I9XX_LVDS];
                else
                        limit = &intel_limits[INTEL_LIMIT_I9XX_SDVO_DAC];
        } else if (IS_IGD(dev)) {
                if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS))
                        limit = &intel_limits[INTEL_LIMIT_IGD_LVDS];
                else
                        limit = &intel_limits[INTEL_LIMIT_IGD_SDVO_DAC];
        } else {
                if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS))
                        limit = &intel_limits[INTEL_LIMIT_I8XX_LVDS];
                else
                        limit = &intel_limits[INTEL_LIMIT_I8XX_DVO_DAC];
        }
        return limit;
}

/* m1 is reserved as 0 in IGD, n is a ring counter */
static void igd_clock(int refclk, intel_clock_t *clock)
{
        clock->m = clock->m2 + 2;
        clock->p = clock->p1 * clock->p2;
        clock->vco = refclk * clock->m / clock->n;
        clock->dot = clock->vco / clock->p;
}

static void intel_clock(struct drm_device *dev, int refclk, intel_clock_t *clock)
{
        if (IS_IGD(dev)) {
                igd_clock(refclk, clock);
                return;
        }
        clock->m = 5 * (clock->m1 + 2) + (clock->m2 + 2);
        clock->p = clock->p1 * clock->p2;
        clock->vco = refclk * clock->m / (clock->n + 2);
        clock->dot = clock->vco / clock->p;
}

/**
 * Returns whether any output on the specified pipe is of the specified type
 */
bool intel_pipe_has_type (struct drm_crtc *crtc, int type)
{
    struct drm_device *dev = crtc->dev;
    struct drm_mode_config *mode_config = &dev->mode_config;
    struct drm_connector *l_entry;

    list_for_each_entry(l_entry, &mode_config->connector_list, head) {
            if (l_entry->encoder &&
                l_entry->encoder->crtc == crtc) {
                    struct intel_output *intel_output = to_intel_output(l_entry);
                    if (intel_output->type == type)
                            return true;
            }
    }
    return false;
}

#define INTELPllInvalid(s)   do { /* DRM_DEBUG(s); */ return false; } while (0)
/**
 * Returns whether the given set of divisors are valid for a given refclk with
 * the given connectors.
 */

static bool intel_PLL_is_valid(struct drm_crtc *crtc, intel_clock_t *clock)
{
        const intel_limit_t *limit = intel_limit (crtc);
        struct drm_device *dev = crtc->dev;

        if (clock->p1  < limit->p1.min  || limit->p1.max  < clock->p1)
                INTELPllInvalid ("p1 out of range\n");
        if (clock->p   < limit->p.min   || limit->p.max   < clock->p)
                INTELPllInvalid ("p out of range\n");
        if (clock->m2  < limit->m2.min  || limit->m2.max  < clock->m2)
                INTELPllInvalid ("m2 out of range\n");
        if (clock->m1  < limit->m1.min  || limit->m1.max  < clock->m1)
                INTELPllInvalid ("m1 out of range\n");
        if (clock->m1 <= clock->m2 && !IS_IGD(dev))
                INTELPllInvalid ("m1 <= m2\n");
        if (clock->m   < limit->m.min   || limit->m.max   < clock->m)
                INTELPllInvalid ("m out of range\n");
        if (clock->n   < limit->n.min   || limit->n.max   < clock->n)
                INTELPllInvalid ("n out of range\n");
        if (clock->vco < limit->vco.min || limit->vco.max < clock->vco)
                INTELPllInvalid ("vco out of range\n");
        /* XXX: We may need to be checking "Dot clock" depending on the multiplier,
         * connector, etc., rather than just a single range.
         */
        if (clock->dot < limit->dot.min || limit->dot.max < clock->dot)
                INTELPllInvalid ("dot out of range\n");

        return true;
}

static bool
intel_find_best_PLL(const intel_limit_t *limit, struct drm_crtc *crtc,
                    int target, int refclk, intel_clock_t *best_clock)

{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        intel_clock_t clock;
        int err = target;

        if (IS_I9XX(dev) && intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS) &&
            (I915_READ(LVDS) & LVDS_PORT_EN) != 0) {
                /*
                 * For LVDS, if the panel is on, just rely on its current
                 * settings for dual-channel.  We haven't figured out how to
                 * reliably set up different single/dual channel state, if we
                 * even can.
                 */
                if ((I915_READ(LVDS) & LVDS_CLKB_POWER_MASK) ==
                    LVDS_CLKB_POWER_UP)
                        clock.p2 = limit->p2.p2_fast;
                else
                        clock.p2 = limit->p2.p2_slow;
        } else {
                if (target < limit->p2.dot_limit)
                        clock.p2 = limit->p2.p2_slow;
                else
                        clock.p2 = limit->p2.p2_fast;
        }

        memset (best_clock, 0, sizeof (*best_clock));

        for (clock.m1 = limit->m1.min; clock.m1 <= limit->m1.max; clock.m1++) {
                for (clock.m2 = limit->m2.min; clock.m2 <= limit->m2.max; clock.m2++) {
                        /* m1 is always 0 in IGD */
                        if (clock.m2 >= clock.m1 && !IS_IGD(dev))
                                break;
                        for (clock.n = limit->n.min; clock.n <= limit->n.max;
                             clock.n++) {
                                for (clock.p1 = limit->p1.min;
                                     clock.p1 <= limit->p1.max; clock.p1++) {
                                        int this_err;

                                        intel_clock(dev, refclk, &clock);

                                        if (!intel_PLL_is_valid(crtc, &clock))
                                                continue;

                                        this_err = abs(clock.dot - target);
                                        if (this_err < err) {
                                                *best_clock = clock;
                                                err = this_err;
                                        }
                                }
                        }
                }
        }

        return (err != target);
}

static bool
intel_g4x_find_best_PLL(const intel_limit_t *limit, struct drm_crtc *crtc,
                        int target, int refclk, intel_clock_t *best_clock)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        intel_clock_t clock;
        int max_n;
        bool found;
        /* approximately equals target * 0.00488 */
        int err_most = (target >> 8) + (target >> 10);
        found = false;

        if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS)) {
                if ((I915_READ(LVDS) & LVDS_CLKB_POWER_MASK) ==
                    LVDS_CLKB_POWER_UP)
                        clock.p2 = limit->p2.p2_fast;
                else
                        clock.p2 = limit->p2.p2_slow;
        } else {
                if (target < limit->p2.dot_limit)
                        clock.p2 = limit->p2.p2_slow;
                else
                        clock.p2 = limit->p2.p2_fast;
        }

        memset(best_clock, 0, sizeof(*best_clock));
        max_n = limit->n.max;
        /* based on hardware requriment prefer smaller n to precision */
        for (clock.n = limit->n.min; clock.n <= max_n; clock.n++) {
                /* based on hardware requirment prefere larger m1,m2, p1 */
                for (clock.m1 = limit->m1.max;
                     clock.m1 >= limit->m1.min; clock.m1--) {
                        for (clock.m2 = limit->m2.max;
                             clock.m2 >= limit->m2.min; clock.m2--) {
                                for (clock.p1 = limit->p1.max;
                                     clock.p1 >= limit->p1.min; clock.p1--) {
                                        int this_err;

                                        intel_clock(dev, refclk, &clock);
                                        if (!intel_PLL_is_valid(crtc, &clock))
                                                continue;
                                        this_err = abs(clock.dot - target) ;
                                        if (this_err < err_most) {
                                                *best_clock = clock;
                                                err_most = this_err;
                                                max_n = clock.n;
                                                found = true;
                                        }
                                }
                        }
                }
        }

        return found;
}

void
intel_wait_for_vblank(struct drm_device *dev)
{
        /* Wait for 20ms, i.e. one cycle at 50hz. */
        mdelay(20);
}

static int
intel_pipe_set_base(struct drm_crtc *crtc, int x, int y,
                    struct drm_framebuffer *old_fb)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct drm_i915_master_private *master_priv;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        struct intel_framebuffer *intel_fb;
        struct drm_i915_gem_object *obj_priv;
        struct drm_gem_object *obj;
        int pipe = intel_crtc->pipe;
        unsigned long Start, Offset;
        int dspbase = (pipe == 0 ? DSPAADDR : DSPBADDR);
        int dspsurf = (pipe == 0 ? DSPASURF : DSPBSURF);
        int dspstride = (pipe == 0) ? DSPASTRIDE : DSPBSTRIDE;
        int dsptileoff = (pipe == 0 ? DSPATILEOFF : DSPBTILEOFF);
        int dspcntr_reg = (pipe == 0) ? DSPACNTR : DSPBCNTR;
        u32 dspcntr, alignment;
        int ret;

        /* no fb bound */
        if (!crtc->fb) {
                DRM_DEBUG("No FB bound\n");
                return 0;
        }

        switch (pipe) {
        case 0:
        case 1:
                break;
        default:
                DRM_ERROR("Can't update pipe %d in SAREA\n", pipe);
                return -EINVAL;
        }

        intel_fb = to_intel_framebuffer(crtc->fb);
        obj = intel_fb->obj;
        obj_priv = obj->driver_private;

        switch (obj_priv->tiling_mode) {
        case I915_TILING_NONE:
                alignment = 64 * 1024;
                break;
        case I915_TILING_X:
                /* pin() will align the object as required by fence */
                alignment = 0;
                break;
        case I915_TILING_Y:
                /* FIXME: Is this true? */
                DRM_ERROR("Y tiled not allowed for scan out buffers\n");
                return -EINVAL;
        default:
                BUG();
        }

        mutex_lock(&dev->struct_mutex);
        ret = i915_gem_object_pin(intel_fb->obj, alignment);
        if (ret != 0) {
                mutex_unlock(&dev->struct_mutex);
                return ret;
        }

        ret = i915_gem_object_set_to_gtt_domain(intel_fb->obj, 1);
        if (ret != 0) {
                i915_gem_object_unpin(intel_fb->obj);
                mutex_unlock(&dev->struct_mutex);
                return ret;
        }

        dspcntr = I915_READ(dspcntr_reg);
        /* Mask out pixel format bits in case we change it */
        dspcntr &= ~DISPPLANE_PIXFORMAT_MASK;
        switch (crtc->fb->bits_per_pixel) {
        case 8:
                dspcntr |= DISPPLANE_8BPP;
                break;
        case 16:
                if (crtc->fb->depth == 15)
                        dspcntr |= DISPPLANE_15_16BPP;
                else
                        dspcntr |= DISPPLANE_16BPP;
                break;
        case 24:
        case 32:
                dspcntr |= DISPPLANE_32BPP_NO_ALPHA;
                break;
        default:
                DRM_ERROR("Unknown color depth\n");
                i915_gem_object_unpin(intel_fb->obj);
                mutex_unlock(&dev->struct_mutex);
                return -EINVAL;
        }
        if (IS_I965G(dev)) {
                if (obj_priv->tiling_mode != I915_TILING_NONE)
                        dspcntr |= DISPPLANE_TILED;
                else
                        dspcntr &= ~DISPPLANE_TILED;
        }

        I915_WRITE(dspcntr_reg, dspcntr);

        Start = obj_priv->gtt_offset;
        Offset = y * crtc->fb->pitch + x * (crtc->fb->bits_per_pixel / 8);

        DRM_DEBUG("Writing base %08lX %08lX %d %d\n", Start, Offset, x, y);
        I915_WRITE(dspstride, crtc->fb->pitch);
        if (IS_I965G(dev)) {
                I915_WRITE(dspbase, Offset);
                I915_READ(dspbase);
                I915_WRITE(dspsurf, Start);
                I915_READ(dspsurf);
                I915_WRITE(dsptileoff, (y << 16) | x);
        } else {
                I915_WRITE(dspbase, Start + Offset);
                I915_READ(dspbase);
        }

        intel_wait_for_vblank(dev);

        if (old_fb) {
                intel_fb = to_intel_framebuffer(old_fb);
                i915_gem_object_unpin(intel_fb->obj);
        }
        mutex_unlock(&dev->struct_mutex);

        if (!dev->primary->master)
                return 0;

        master_priv = dev->primary->master->driver_priv;
        if (!master_priv->sarea_priv)
                return 0;

        if (pipe) {
                master_priv->sarea_priv->pipeB_x = x;
                master_priv->sarea_priv->pipeB_y = y;
        } else {
                master_priv->sarea_priv->pipeA_x = x;
                master_priv->sarea_priv->pipeA_y = y;
        }

        return 0;
}



/**
 * Sets the power management mode of the pipe and plane.
 *
 * This code should probably grow support for turning the cursor off and back
 * on appropriately at the same time as we're turning the pipe off/on.
 */
static void intel_crtc_dpms(struct drm_crtc *crtc, int mode)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_master_private *master_priv;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int pipe = intel_crtc->pipe;
        int dpll_reg = (pipe == 0) ? DPLL_A : DPLL_B;
        int dspcntr_reg = (pipe == 0) ? DSPACNTR : DSPBCNTR;
        int dspbase_reg = (pipe == 0) ? DSPAADDR : DSPBADDR;
        int pipeconf_reg = (pipe == 0) ? PIPEACONF : PIPEBCONF;
        u32 temp;
        bool enabled;

        /* XXX: When our outputs are all unaware of DPMS modes other than off
         * and on, we should map those modes to DRM_MODE_DPMS_OFF in the CRTC.
         */
        switch (mode) {
        case DRM_MODE_DPMS_ON:
        case DRM_MODE_DPMS_STANDBY:
        case DRM_MODE_DPMS_SUSPEND:
                /* Enable the DPLL */
                temp = I915_READ(dpll_reg);
                if ((temp & DPLL_VCO_ENABLE) == 0) {
                        I915_WRITE(dpll_reg, temp);
                        I915_READ(dpll_reg);
                        /* Wait for the clocks to stabilize. */
                        udelay(150);
                        I915_WRITE(dpll_reg, temp | DPLL_VCO_ENABLE);
                        I915_READ(dpll_reg);
                        /* Wait for the clocks to stabilize. */
                        udelay(150);
                        I915_WRITE(dpll_reg, temp | DPLL_VCO_ENABLE);
                        I915_READ(dpll_reg);
                        /* Wait for the clocks to stabilize. */
                        udelay(150);
                }

                /* Enable the pipe */
                temp = I915_READ(pipeconf_reg);
                if ((temp & PIPEACONF_ENABLE) == 0)
                        I915_WRITE(pipeconf_reg, temp | PIPEACONF_ENABLE);

                /* Enable the plane */
                temp = I915_READ(dspcntr_reg);
                if ((temp & DISPLAY_PLANE_ENABLE) == 0) {
                        I915_WRITE(dspcntr_reg, temp | DISPLAY_PLANE_ENABLE);
                        /* Flush the plane changes */
                        I915_WRITE(dspbase_reg, I915_READ(dspbase_reg));
                }

                intel_crtc_load_lut(crtc);

                /* Give the overlay scaler a chance to enable if it's on this pipe */
                //intel_crtc_dpms_video(crtc, true); TODO
        break;
        case DRM_MODE_DPMS_OFF:
                /* Give the overlay scaler a chance to disable if it's on this pipe */
                //intel_crtc_dpms_video(crtc, FALSE); TODO

                /* Disable the VGA plane that we never use */
                I915_WRITE(VGACNTRL, VGA_DISP_DISABLE);

                /* Disable display plane */
                temp = I915_READ(dspcntr_reg);
                if ((temp & DISPLAY_PLANE_ENABLE) != 0) {
                        I915_WRITE(dspcntr_reg, temp & ~DISPLAY_PLANE_ENABLE);
                        /* Flush the plane changes */
                        I915_WRITE(dspbase_reg, I915_READ(dspbase_reg));
                        I915_READ(dspbase_reg);
                }

                if (!IS_I9XX(dev)) {
                        /* Wait for vblank for the disable to take effect */
                        intel_wait_for_vblank(dev);
                }

                /* Next, disable display pipes */
                temp = I915_READ(pipeconf_reg);
                if ((temp & PIPEACONF_ENABLE) != 0) {
                        I915_WRITE(pipeconf_reg, temp & ~PIPEACONF_ENABLE);
                        I915_READ(pipeconf_reg);
                }

                /* Wait for vblank for the disable to take effect. */
                intel_wait_for_vblank(dev);

                temp = I915_READ(dpll_reg);
                if ((temp & DPLL_VCO_ENABLE) != 0) {
                        I915_WRITE(dpll_reg, temp & ~DPLL_VCO_ENABLE);
                        I915_READ(dpll_reg);
                }

                /* Wait for the clocks to turn off. */
                udelay(150);
                break;
        }

        if (!dev->primary->master)
                return;

        master_priv = dev->primary->master->driver_priv;
        if (!master_priv->sarea_priv)
                return;

        enabled = crtc->enabled && mode != DRM_MODE_DPMS_OFF;

        switch (pipe) {
        case 0:
                master_priv->sarea_priv->pipeA_w = enabled ? crtc->mode.hdisplay : 0;
                master_priv->sarea_priv->pipeA_h = enabled ? crtc->mode.vdisplay : 0;
                break;
        case 1:
                master_priv->sarea_priv->pipeB_w = enabled ? crtc->mode.hdisplay : 0;
                master_priv->sarea_priv->pipeB_h = enabled ? crtc->mode.vdisplay : 0;
                break;
        default:
                DRM_ERROR("Can't update pipe %d in SAREA\n", pipe);
                break;
        }

        intel_crtc->dpms_mode = mode;
}

static void intel_crtc_prepare (struct drm_crtc *crtc)
{
        struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
        crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
}

static void intel_crtc_commit (struct drm_crtc *crtc)
{
        struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
        crtc_funcs->dpms(crtc, DRM_MODE_DPMS_ON);
}

void intel_encoder_prepare (struct drm_encoder *encoder)
{
        struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
        /* lvds has its own version of prepare see intel_lvds_prepare */
        encoder_funcs->dpms(encoder, DRM_MODE_DPMS_OFF);
}

void intel_encoder_commit (struct drm_encoder *encoder)
{
        struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
        /* lvds has its own version of commit see intel_lvds_commit */
        encoder_funcs->dpms(encoder, DRM_MODE_DPMS_ON);
}

static bool intel_crtc_mode_fixup(struct drm_crtc *crtc,
                                  struct drm_display_mode *mode,
                                  struct drm_display_mode *adjusted_mode)
{
        return true;
}


/** Returns the core display clock speed for i830 - i945 */
static int intel_get_core_clock_speed(struct drm_device *dev)
{

        /* Core clock values taken from the published datasheets.
         * The 830 may go up to 166 Mhz, which we should check.
         */
        if (IS_I945G(dev))
                return 400000;
        else if (IS_I915G(dev))
                return 333000;
        else if (IS_I945GM(dev) || IS_845G(dev) || IS_IGDGM(dev))
                return 200000;
        else if (IS_I915GM(dev)) {
                u16 gcfgc = 0;

                pci_read_config_word(dev->pdev, GCFGC, &gcfgc);

                if (gcfgc & GC_LOW_FREQUENCY_ENABLE)
                        return 133000;
                else {
                        switch (gcfgc & GC_DISPLAY_CLOCK_MASK) {
                        case GC_DISPLAY_CLOCK_333_MHZ:
                                return 333000;
                        default:
                        case GC_DISPLAY_CLOCK_190_200_MHZ:
                                return 190000;
                        }
                }
        } else if (IS_I865G(dev))
                return 266000;
        else if (IS_I855(dev)) {
                u16 hpllcc = 0;
                /* Assume that the hardware is in the high speed state.  This
                 * should be the default.
                 */
                switch (hpllcc & GC_CLOCK_CONTROL_MASK) {
                case GC_CLOCK_133_200:
                case GC_CLOCK_100_200:
                        return 200000;
                case GC_CLOCK_166_250:
                        return 250000;
                case GC_CLOCK_100_133:
                        return 133000;
                }
        } else /* 852, 830 */
                return 133000;

        return 0; /* Silence gcc warning */
}


/**
 * Return the pipe currently connected to the panel fitter,
 * or -1 if the panel fitter is not present or not in use
 */
static int intel_panel_fitter_pipe (struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        u32  pfit_control;

        /* i830 doesn't have a panel fitter */
        if (IS_I830(dev))
                return -1;

        pfit_control = I915_READ(PFIT_CONTROL);

        /* See if the panel fitter is in use */
        if ((pfit_control & PFIT_ENABLE) == 0)
                return -1;

        /* 965 can place panel fitter on either pipe */
        if (IS_I965G(dev))
                return (pfit_control >> 29) & 0x3;

        /* older chips can only use pipe 1 */
        return 1;
}

static int intel_crtc_mode_set(struct drm_crtc *crtc,
                               struct drm_display_mode *mode,
                               struct drm_display_mode *adjusted_mode,
                               int x, int y,
                               struct drm_framebuffer *old_fb)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int pipe = intel_crtc->pipe;
        int fp_reg = (pipe == 0) ? FPA0 : FPB0;
        int dpll_reg = (pipe == 0) ? DPLL_A : DPLL_B;
        int dpll_md_reg = (intel_crtc->pipe == 0) ? DPLL_A_MD : DPLL_B_MD;
        int dspcntr_reg = (pipe == 0) ? DSPACNTR : DSPBCNTR;
        int pipeconf_reg = (pipe == 0) ? PIPEACONF : PIPEBCONF;
        int htot_reg = (pipe == 0) ? HTOTAL_A : HTOTAL_B;
        int hblank_reg = (pipe == 0) ? HBLANK_A : HBLANK_B;
        int hsync_reg = (pipe == 0) ? HSYNC_A : HSYNC_B;
        int vtot_reg = (pipe == 0) ? VTOTAL_A : VTOTAL_B;
        int vblank_reg = (pipe == 0) ? VBLANK_A : VBLANK_B;
        int vsync_reg = (pipe == 0) ? VSYNC_A : VSYNC_B;
        int dspsize_reg = (pipe == 0) ? DSPASIZE : DSPBSIZE;
        int dsppos_reg = (pipe == 0) ? DSPAPOS : DSPBPOS;
        int pipesrc_reg = (pipe == 0) ? PIPEASRC : PIPEBSRC;
        int refclk, num_outputs = 0;
        intel_clock_t clock;
        u32 dpll = 0, fp = 0, dspcntr, pipeconf;
        bool ok, is_sdvo = false, is_dvo = false;
        bool is_crt = false, is_lvds = false, is_tv = false;
        struct drm_mode_config *mode_config = &dev->mode_config;
        struct drm_connector *connector;
        const intel_limit_t *limit;
        int ret;

        drm_vblank_pre_modeset(dev, pipe);

        list_for_each_entry(connector, &mode_config->connector_list, head) {
                struct intel_output *intel_output = to_intel_output(connector);

                if (!connector->encoder || connector->encoder->crtc != crtc)
                        continue;

                switch (intel_output->type) {
                case INTEL_OUTPUT_LVDS:
                        is_lvds = true;
                        break;
                case INTEL_OUTPUT_SDVO:
                case INTEL_OUTPUT_HDMI:
                        is_sdvo = true;
                        if (intel_output->needs_tv_clock)
                                is_tv = true;
                        break;
                case INTEL_OUTPUT_DVO:
                        is_dvo = true;
                        break;
                case INTEL_OUTPUT_TVOUT:
                        is_tv = true;
                        break;
                case INTEL_OUTPUT_ANALOG:
                        is_crt = true;
                        break;
                }

                num_outputs++;
        }

        if (is_lvds && dev_priv->lvds_use_ssc && num_outputs < 2) {
                refclk = dev_priv->lvds_ssc_freq * 1000;
                DRM_DEBUG("using SSC reference clock of %d MHz\n", refclk / 1000);
        } else if (IS_I9XX(dev)) {
                refclk = 96000;
        } else {
                refclk = 48000;
        }

        /*
         * Returns a set of divisors for the desired target clock with the given
         * refclk, or FALSE.  The returned values represent the clock equation:
         * reflck * (5 * (m1 + 2) + (m2 + 2)) / (n + 2) / p1 / p2.
         */
        limit = intel_limit(crtc);
        ok = limit->find_pll(limit, crtc, adjusted_mode->clock, refclk, &clock);
        if (!ok) {
                DRM_ERROR("Couldn't find PLL settings for mode!\n");
                return -EINVAL;
        }

        /* SDVO TV has fixed PLL values depend on its clock range,
           this mirrors vbios setting. */
        if (is_sdvo && is_tv) {
                if (adjusted_mode->clock >= 100000
                                && adjusted_mode->clock < 140500) {
                        clock.p1 = 2;
                        clock.p2 = 10;
                        clock.n = 3;
                        clock.m1 = 16;
                        clock.m2 = 8;
                } else if (adjusted_mode->clock >= 140500
                                && adjusted_mode->clock <= 200000) {
                        clock.p1 = 1;
                        clock.p2 = 10;
                        clock.n = 6;
                        clock.m1 = 12;
                        clock.m2 = 8;
                }
        }

        if (IS_IGD(dev))
                fp = (1 << clock.n) << 16 | clock.m1 << 8 | clock.m2;
        else
                fp = clock.n << 16 | clock.m1 << 8 | clock.m2;

        dpll = DPLL_VGA_MODE_DIS;
        if (IS_I9XX(dev)) {
                if (is_lvds)
                        dpll |= DPLLB_MODE_LVDS;
                else
                        dpll |= DPLLB_MODE_DAC_SERIAL;
                if (is_sdvo) {
                        dpll |= DPLL_DVO_HIGH_SPEED;
                        if (IS_I945G(dev) || IS_I945GM(dev)) {
                                int sdvo_pixel_multiply = adjusted_mode->clock / mode->clock;
                                dpll |= (sdvo_pixel_multiply - 1) << SDVO_MULTIPLIER_SHIFT_HIRES;
                        }
                }

                /* compute bitmask from p1 value */
                if (IS_IGD(dev))
                        dpll |= (1 << (clock.p1 - 1)) << DPLL_FPA01_P1_POST_DIV_SHIFT_IGD;
                else
                        dpll |= (1 << (clock.p1 - 1)) << DPLL_FPA01_P1_POST_DIV_SHIFT;
                switch (clock.p2) {
                case 5:
                        dpll |= DPLL_DAC_SERIAL_P2_CLOCK_DIV_5;
                        break;
                case 7:
                        dpll |= DPLLB_LVDS_P2_CLOCK_DIV_7;
                        break;
                case 10:
                        dpll |= DPLL_DAC_SERIAL_P2_CLOCK_DIV_10;
                        break;
                case 14:
                        dpll |= DPLLB_LVDS_P2_CLOCK_DIV_14;
                        break;
                }
                if (IS_I965G(dev))
                        dpll |= (6 << PLL_LOAD_PULSE_PHASE_SHIFT);
        } else {
                if (is_lvds) {
                        dpll |= (1 << (clock.p1 - 1)) << DPLL_FPA01_P1_POST_DIV_SHIFT;
                } else {
                        if (clock.p1 == 2)
                                dpll |= PLL_P1_DIVIDE_BY_TWO;
                        else
                                dpll |= (clock.p1 - 2) << DPLL_FPA01_P1_POST_DIV_SHIFT;
                        if (clock.p2 == 4)
                                dpll |= PLL_P2_DIVIDE_BY_4;
                }
        }

        if (is_sdvo && is_tv)
                dpll |= PLL_REF_INPUT_TVCLKINBC;
        else if (is_tv)
                /* XXX: just matching BIOS for now */
                /*      dpll |= PLL_REF_INPUT_TVCLKINBC; */
                dpll |= 3;
        else if (is_lvds && dev_priv->lvds_use_ssc && num_outputs < 2)
                dpll |= PLLB_REF_INPUT_SPREADSPECTRUMIN;
        else
                dpll |= PLL_REF_INPUT_DREFCLK;

        /* setup pipeconf */
        pipeconf = I915_READ(pipeconf_reg);

        /* Set up the display plane register */
        dspcntr = DISPPLANE_GAMMA_ENABLE;

        if (pipe == 0)
                dspcntr |= DISPPLANE_SEL_PIPE_A;
        else
                dspcntr |= DISPPLANE_SEL_PIPE_B;

        if (pipe == 0 && !IS_I965G(dev)) {
                /* Enable pixel doubling when the dot clock is > 90% of the (display)
                 * core speed.
                 *
                 * XXX: No double-wide on 915GM pipe B. Is that the only reason for the
                 * pipe == 0 check?
                 */
                if (mode->clock > intel_get_core_clock_speed(dev) * 9 / 10)
                        pipeconf |= PIPEACONF_DOUBLE_WIDE;
                else
                        pipeconf &= ~PIPEACONF_DOUBLE_WIDE;
        }

        dspcntr |= DISPLAY_PLANE_ENABLE;
        pipeconf |= PIPEACONF_ENABLE;
        dpll |= DPLL_VCO_ENABLE;


        /* Disable the panel fitter if it was on our pipe */
        if (intel_panel_fitter_pipe(dev) == pipe)
                I915_WRITE(PFIT_CONTROL, 0);

        DRM_DEBUG("Mode for pipe %c:\n", pipe == 0 ? 'A' : 'B');
        drm_mode_debug_printmodeline(mode);


        if (dpll & DPLL_VCO_ENABLE) {
                I915_WRITE(fp_reg, fp);
                I915_WRITE(dpll_reg, dpll & ~DPLL_VCO_ENABLE);
                I915_READ(dpll_reg);
                udelay(150);
        }

        /* The LVDS pin pair needs to be on before the DPLLs are enabled.
         * This is an exception to the general rule that mode_set doesn't turn
         * things on.
         */
        if (is_lvds) {
                u32 lvds = I915_READ(LVDS);

                lvds |= LVDS_PORT_EN | LVDS_A0A2_CLKA_POWER_UP | LVDS_PIPEB_SELECT;
                /* Set the B0-B3 data pairs corresponding to whether we're going to
                 * set the DPLLs for dual-channel mode or not.
                 */
                if (clock.p2 == 7)
                        lvds |= LVDS_B0B3_POWER_UP | LVDS_CLKB_POWER_UP;
                else
                        lvds &= ~(LVDS_B0B3_POWER_UP | LVDS_CLKB_POWER_UP);

                /* It would be nice to set 24 vs 18-bit mode (LVDS_A3_POWER_UP)
                 * appropriately here, but we need to look more thoroughly into how
                 * panels behave in the two modes.
                 */

                I915_WRITE(LVDS, lvds);
                I915_READ(LVDS);
        }

        I915_WRITE(fp_reg, fp);
        I915_WRITE(dpll_reg, dpll);
        I915_READ(dpll_reg);
        /* Wait for the clocks to stabilize. */
        udelay(150);

        if (IS_I965G(dev)) {
                int sdvo_pixel_multiply = adjusted_mode->clock / mode->clock;
                I915_WRITE(dpll_md_reg, (0 << DPLL_MD_UDI_DIVIDER_SHIFT) |
                           ((sdvo_pixel_multiply - 1) << DPLL_MD_UDI_MULTIPLIER_SHIFT));
        } else {
                /* write it again -- the BIOS does, after all */
                I915_WRITE(dpll_reg, dpll);
        }
        I915_READ(dpll_reg);
        /* Wait for the clocks to stabilize. */
        udelay(150);

        I915_WRITE(htot_reg, (adjusted_mode->crtc_hdisplay - 1) |
                   ((adjusted_mode->crtc_htotal - 1) << 16));
        I915_WRITE(hblank_reg, (adjusted_mode->crtc_hblank_start - 1) |
                   ((adjusted_mode->crtc_hblank_end - 1) << 16));
        I915_WRITE(hsync_reg, (adjusted_mode->crtc_hsync_start - 1) |
                   ((adjusted_mode->crtc_hsync_end - 1) << 16));
        I915_WRITE(vtot_reg, (adjusted_mode->crtc_vdisplay - 1) |
                   ((adjusted_mode->crtc_vtotal - 1) << 16));
        I915_WRITE(vblank_reg, (adjusted_mode->crtc_vblank_start - 1) |
                   ((adjusted_mode->crtc_vblank_end - 1) << 16));
        I915_WRITE(vsync_reg, (adjusted_mode->crtc_vsync_start - 1) |
                   ((adjusted_mode->crtc_vsync_end - 1) << 16));
        /* pipesrc and dspsize control the size that is scaled from, which should
         * always be the user's requested size.
         */
        I915_WRITE(dspsize_reg, ((mode->vdisplay - 1) << 16) | (mode->hdisplay - 1));
        I915_WRITE(dsppos_reg, 0);
        I915_WRITE(pipesrc_reg, ((mode->hdisplay - 1) << 16) | (mode->vdisplay - 1));
        I915_WRITE(pipeconf_reg, pipeconf);
        I915_READ(pipeconf_reg);

        intel_wait_for_vblank(dev);

        I915_WRITE(dspcntr_reg, dspcntr);

        /* Flush the plane changes */
        ret = intel_pipe_set_base(crtc, x, y, old_fb);
        if (ret != 0)
            return ret;

        drm_vblank_post_modeset(dev, pipe);

        return 0;
}

/** Loads the palette/gamma unit for the CRTC with the prepared values */
void intel_crtc_load_lut(struct drm_crtc *crtc)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int palreg = (intel_crtc->pipe == 0) ? PALETTE_A : PALETTE_B;
        int i;

        /* The clocks have to be on to load the palette. */
        if (!crtc->enabled)
                return;

        for (i = 0; i < 256; i++) {
                I915_WRITE(palreg + 4 * i,
                           (intel_crtc->lut_r[i] << 16) |
                           (intel_crtc->lut_g[i] << 8) |
                           intel_crtc->lut_b[i]);
        }
}

static int intel_crtc_cursor_set(struct drm_crtc *crtc,
                                 struct drm_file *file_priv,
                                 uint32_t handle,
                                 uint32_t width, uint32_t height)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        struct drm_gem_object *bo;
        struct drm_i915_gem_object *obj_priv;
        int pipe = intel_crtc->pipe;
        uint32_t control = (pipe == 0) ? CURACNTR : CURBCNTR;
        uint32_t base = (pipe == 0) ? CURABASE : CURBBASE;
        uint32_t temp;
        size_t addr;
        int ret;

        DRM_DEBUG("\n");

        /* if we want to turn off the cursor ignore width and height */
        if (!handle) {
                DRM_DEBUG("cursor off\n");
                temp = CURSOR_MODE_DISABLE;
                addr = 0;
                bo = NULL;
                mutex_lock(&dev->struct_mutex);
                goto finish;
        }

        /* Currently we only support 64x64 cursors */
        if (width != 64 || height != 64) {
                DRM_ERROR("we currently only support 64x64 cursors\n");
                return -EINVAL;
        }

        bo = drm_gem_object_lookup(dev, file_priv, handle);
        if (!bo)
                return -ENOENT;

        obj_priv = bo->driver_private;

        if (bo->size < width * height * 4) {
                DRM_ERROR("buffer is to small\n");
                ret = -ENOMEM;
                goto fail;
        }

        /* we only need to pin inside GTT if cursor is non-phy */
        mutex_lock(&dev->struct_mutex);
        if (!dev_priv->cursor_needs_physical) {
                ret = i915_gem_object_pin(bo, PAGE_SIZE);
                if (ret) {
                        DRM_ERROR("failed to pin cursor bo\n");
                        goto fail_locked;
                }
                addr = obj_priv->gtt_offset;
        } else {
                ret = i915_gem_attach_phys_object(dev, bo, (pipe == 0) ? I915_GEM_PHYS_CURSOR_0 : I915_GEM_PHYS_CURSOR_1);
                if (ret) {
                        DRM_ERROR("failed to attach phys object\n");
                        goto fail_locked;
                }
                addr = obj_priv->phys_obj->handle->busaddr;
        }

        temp = 0;
        /* set the pipe for the cursor */
        temp |= (pipe << 28);
        temp |= CURSOR_MODE_64_ARGB_AX | MCURSOR_GAMMA_ENABLE;

 finish:
        I915_WRITE(control, temp);
        I915_WRITE(base, addr);

        if (intel_crtc->cursor_bo) {
                if (dev_priv->cursor_needs_physical) {
                        if (intel_crtc->cursor_bo != bo)
                                i915_gem_detach_phys_object(dev, intel_crtc->cursor_bo);
                } else
                        i915_gem_object_unpin(intel_crtc->cursor_bo);
                drm_gem_object_unreference(intel_crtc->cursor_bo);
        }
        mutex_unlock(&dev->struct_mutex);

        intel_crtc->cursor_addr = addr;
        intel_crtc->cursor_bo = bo;

        return 0;
fail:
        mutex_lock(&dev->struct_mutex);
fail_locked:
        drm_gem_object_unreference(bo);
        mutex_unlock(&dev->struct_mutex);
        return ret;
}

static int intel_crtc_cursor_move(struct drm_crtc *crtc, int x, int y)
{
        struct drm_device *dev = crtc->dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int pipe = intel_crtc->pipe;
        uint32_t temp = 0;
        uint32_t adder;

        if (x < 0) {
                temp |= (CURSOR_POS_SIGN << CURSOR_X_SHIFT);
                x = -x;
        }
        if (y < 0) {
                temp |= (CURSOR_POS_SIGN << CURSOR_Y_SHIFT);
                y = -y;
        }

        temp |= ((x & CURSOR_POS_MASK) << CURSOR_X_SHIFT);
        temp |= ((y & CURSOR_POS_MASK) << CURSOR_Y_SHIFT);

        adder = intel_crtc->cursor_addr;
        I915_WRITE((pipe == 0) ? CURAPOS : CURBPOS, temp);
        I915_WRITE((pipe == 0) ? CURABASE : CURBBASE, adder);

        return 0;
}

/** Sets the color ramps on behalf of RandR */
void intel_crtc_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
                                 u16 blue, int regno)
{
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);

        intel_crtc->lut_r[regno] = red >> 8;
        intel_crtc->lut_g[regno] = green >> 8;
        intel_crtc->lut_b[regno] = blue >> 8;
}

static void intel_crtc_gamma_set(struct drm_crtc *crtc, u16 *red, u16 *green,
                                 u16 *blue, uint32_t size)
{
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int i;

        if (size != 256)
                return;

        for (i = 0; i < 256; i++) {
                intel_crtc->lut_r[i] = red[i] >> 8;
                intel_crtc->lut_g[i] = green[i] >> 8;
                intel_crtc->lut_b[i] = blue[i] >> 8;
        }

        intel_crtc_load_lut(crtc);
}

/**
 * Get a pipe with a simple mode set on it for doing load-based monitor
 * detection.
 *
 * It will be up to the load-detect code to adjust the pipe as appropriate for
 * its requirements.  The pipe will be connected to no other outputs.
 *
 * Currently this code will only succeed if there is a pipe with no outputs
 * configured for it.  In the future, it could choose to temporarily disable
 * some outputs to free up a pipe for its use.
 *
 * \return crtc, or NULL if no pipes are available.
 */

/* VESA 640x480x72Hz mode to set on the pipe */
static struct drm_display_mode load_detect_mode = {
        DRM_MODE("640x480", DRM_MODE_TYPE_DEFAULT, 31500, 640, 664,
                 704, 832, 0, 480, 489, 491, 520, 0, DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC),
};

struct drm_crtc *intel_get_load_detect_pipe(struct intel_output *intel_output,
                                            struct drm_display_mode *mode,
                                            int *dpms_mode)
{
        struct intel_crtc *intel_crtc;
        struct drm_crtc *possible_crtc;
        struct drm_crtc *supported_crtc =NULL;
        struct drm_encoder *encoder = &intel_output->enc;
        struct drm_crtc *crtc = NULL;
        struct drm_device *dev = encoder->dev;
        struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
        struct drm_crtc_helper_funcs *crtc_funcs;
        int i = -1;

        /*
         * Algorithm gets a little messy:
         *   - if the connector already has an assigned crtc, use it (but make
         *     sure it's on first)
         *   - try to find the first unused crtc that can drive this connector,
         *     and use that if we find one
         *   - if there are no unused crtcs available, try to use the first
         *     one we found that supports the connector
         */

        /* See if we already have a CRTC for this connector */
        if (encoder->crtc) {
                crtc = encoder->crtc;
                /* Make sure the crtc and connector are running */
                intel_crtc = to_intel_crtc(crtc);
                *dpms_mode = intel_crtc->dpms_mode;
                if (intel_crtc->dpms_mode != DRM_MODE_DPMS_ON) {
                        crtc_funcs = crtc->helper_private;
                        crtc_funcs->dpms(crtc, DRM_MODE_DPMS_ON);
                        encoder_funcs->dpms(encoder, DRM_MODE_DPMS_ON);
                }
                return crtc;
        }

        /* Find an unused one (if possible) */
        list_for_each_entry(possible_crtc, &dev->mode_config.crtc_list, head) {
                i++;
                if (!(encoder->possible_crtcs & (1 << i)))
                        continue;
                if (!possible_crtc->enabled) {
                        crtc = possible_crtc;
                        break;
                }
                if (!supported_crtc)
                        supported_crtc = possible_crtc;
        }

        /*
         * If we didn't find an unused CRTC, don't use any.
         */
        if (!crtc) {
                return NULL;
        }

        encoder->crtc = crtc;
        intel_output->load_detect_temp = true;

        intel_crtc = to_intel_crtc(crtc);
        *dpms_mode = intel_crtc->dpms_mode;

        if (!crtc->enabled) {
                if (!mode)
                        mode = &load_detect_mode;
                drm_crtc_helper_set_mode(crtc, mode, 0, 0, crtc->fb);
        } else {
                if (intel_crtc->dpms_mode != DRM_MODE_DPMS_ON) {
                        crtc_funcs = crtc->helper_private;
                        crtc_funcs->dpms(crtc, DRM_MODE_DPMS_ON);
                }

                /* Add this connector to the crtc */
                encoder_funcs->mode_set(encoder, &crtc->mode, &crtc->mode);
                encoder_funcs->commit(encoder);
        }
        /* let the connector get through one full cycle before testing */
        intel_wait_for_vblank(dev);

        return crtc;
}

void intel_release_load_detect_pipe(struct intel_output *intel_output, int dpms_mode)
{
        struct drm_encoder *encoder = &intel_output->enc;
        struct drm_device *dev = encoder->dev;
        struct drm_crtc *crtc = encoder->crtc;
        struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
        struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;

        if (intel_output->load_detect_temp) {
                encoder->crtc = NULL;
                intel_output->load_detect_temp = false;
                crtc->enabled = drm_helper_crtc_in_use(crtc);
                drm_helper_disable_unused_functions(dev);
        }

        /* Switch crtc and output back off if necessary */
        if (crtc->enabled && dpms_mode != DRM_MODE_DPMS_ON) {
                if (encoder->crtc == crtc)
                        encoder_funcs->dpms(encoder, dpms_mode);
                crtc_funcs->dpms(crtc, dpms_mode);
        }
}

/* Returns the clock of the currently programmed mode of the given pipe. */
static int intel_crtc_clock_get(struct drm_device *dev, struct drm_crtc *crtc)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int pipe = intel_crtc->pipe;
        u32 dpll = I915_READ((pipe == 0) ? DPLL_A : DPLL_B);
        u32 fp;
        intel_clock_t clock;

        if ((dpll & DISPLAY_RATE_SELECT_FPA1) == 0)
                fp = I915_READ((pipe == 0) ? FPA0 : FPB0);
        else
                fp = I915_READ((pipe == 0) ? FPA1 : FPB1);

        clock.m1 = (fp & FP_M1_DIV_MASK) >> FP_M1_DIV_SHIFT;
        if (IS_IGD(dev)) {
                clock.n = ffs((fp & FP_N_IGD_DIV_MASK) >> FP_N_DIV_SHIFT) - 1;
                clock.m2 = (fp & FP_M2_IGD_DIV_MASK) >> FP_M2_DIV_SHIFT;
        } else {
                clock.n = (fp & FP_N_DIV_MASK) >> FP_N_DIV_SHIFT;
                clock.m2 = (fp & FP_M2_DIV_MASK) >> FP_M2_DIV_SHIFT;
        }

        if (IS_I9XX(dev)) {
                if (IS_IGD(dev))
                        clock.p1 = ffs((dpll & DPLL_FPA01_P1_POST_DIV_MASK_IGD) >>
                                DPLL_FPA01_P1_POST_DIV_SHIFT_IGD);
                else
                        clock.p1 = ffs((dpll & DPLL_FPA01_P1_POST_DIV_MASK) >>
                               DPLL_FPA01_P1_POST_DIV_SHIFT);

                switch (dpll & DPLL_MODE_MASK) {
                case DPLLB_MODE_DAC_SERIAL:
                        clock.p2 = dpll & DPLL_DAC_SERIAL_P2_CLOCK_DIV_5 ?
                                5 : 10;
                        break;
                case DPLLB_MODE_LVDS:
                        clock.p2 = dpll & DPLLB_LVDS_P2_CLOCK_DIV_7 ?
                                7 : 14;
                        break;
                default:
                        DRM_DEBUG("Unknown DPLL mode %08x in programmed "
                                  "mode\n", (int)(dpll & DPLL_MODE_MASK));
                        return 0;
                }

                /* XXX: Handle the 100Mhz refclk */
                intel_clock(dev, 96000, &clock);
        } else {
                bool is_lvds = (pipe == 1) && (I915_READ(LVDS) & LVDS_PORT_EN);

                if (is_lvds) {
                        clock.p1 = ffs((dpll & DPLL_FPA01_P1_POST_DIV_MASK_I830_LVDS) >>
                                       DPLL_FPA01_P1_POST_DIV_SHIFT);
                        clock.p2 = 14;

                        if ((dpll & PLL_REF_INPUT_MASK) ==
                            PLLB_REF_INPUT_SPREADSPECTRUMIN) {
                                /* XXX: might not be 66MHz */
                                intel_clock(dev, 66000, &clock);
                        } else
                                intel_clock(dev, 48000, &clock);
                } else {
                        if (dpll & PLL_P1_DIVIDE_BY_TWO)
                                clock.p1 = 2;
                        else {
                                clock.p1 = ((dpll & DPLL_FPA01_P1_POST_DIV_MASK_I830) >>
                                            DPLL_FPA01_P1_POST_DIV_SHIFT) + 2;
                        }
                        if (dpll & PLL_P2_DIVIDE_BY_4)
                                clock.p2 = 4;
                        else
                                clock.p2 = 2;

                        intel_clock(dev, 48000, &clock);
                }
        }

        /* XXX: It would be nice to validate the clocks, but we can't reuse
         * i830PllIsValid() because it relies on the xf86_config connector
         * configuration being accurate, which it isn't necessarily.
         */

        return clock.dot;
}

/** Returns the currently programmed mode of the given pipe. */
struct drm_display_mode *intel_crtc_mode_get(struct drm_device *dev,
                                             struct drm_crtc *crtc)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        int pipe = intel_crtc->pipe;
        struct drm_display_mode *mode;
        int htot = I915_READ((pipe == 0) ? HTOTAL_A : HTOTAL_B);
        int hsync = I915_READ((pipe == 0) ? HSYNC_A : HSYNC_B);
        int vtot = I915_READ((pipe == 0) ? VTOTAL_A : VTOTAL_B);
        int vsync = I915_READ((pipe == 0) ? VSYNC_A : VSYNC_B);

        mode = kzalloc(sizeof(*mode), GFP_KERNEL);
        if (!mode)
                return NULL;

        mode->clock = intel_crtc_clock_get(dev, crtc);
        mode->hdisplay = (htot & 0xffff) + 1;
        mode->htotal = ((htot & 0xffff0000) >> 16) + 1;
        mode->hsync_start = (hsync & 0xffff) + 1;
        mode->hsync_end = ((hsync & 0xffff0000) >> 16) + 1;
        mode->vdisplay = (vtot & 0xffff) + 1;
        mode->vtotal = ((vtot & 0xffff0000) >> 16) + 1;
        mode->vsync_start = (vsync & 0xffff) + 1;
        mode->vsync_end = ((vsync & 0xffff0000) >> 16) + 1;

        drm_mode_set_name(mode);
        drm_mode_set_crtcinfo(mode, 0);

        return mode;
}

static void intel_crtc_destroy(struct drm_crtc *crtc)
{
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);

        drm_crtc_cleanup(crtc);
        kfree(intel_crtc);
}

static const struct drm_crtc_helper_funcs intel_helper_funcs = {
        .dpms = intel_crtc_dpms,
        .mode_fixup = intel_crtc_mode_fixup,
        .mode_set = intel_crtc_mode_set,
        .mode_set_base = intel_pipe_set_base,
        .prepare = intel_crtc_prepare,
        .commit = intel_crtc_commit,
};

static const struct drm_crtc_funcs intel_crtc_funcs = {
        .cursor_set = intel_crtc_cursor_set,
        .cursor_move = intel_crtc_cursor_move,
        .gamma_set = intel_crtc_gamma_set,
        .set_config = drm_crtc_helper_set_config,
        .destroy = intel_crtc_destroy,
};


static void intel_crtc_init(struct drm_device *dev, int pipe)
{
        struct intel_crtc *intel_crtc;
        int i;

        intel_crtc = kzalloc(sizeof(struct intel_crtc) + (INTELFB_CONN_LIMIT * sizeof(struct drm_connector *)), GFP_KERNEL);
        if (intel_crtc == NULL)
                return;

        drm_crtc_init(dev, &intel_crtc->base, &intel_crtc_funcs);

        drm_mode_crtc_set_gamma_size(&intel_crtc->base, 256);
        intel_crtc->pipe = pipe;
        for (i = 0; i < 256; i++) {
                intel_crtc->lut_r[i] = i;
                intel_crtc->lut_g[i] = i;
                intel_crtc->lut_b[i] = i;
        }

        intel_crtc->cursor_addr = 0;
        intel_crtc->dpms_mode = DRM_MODE_DPMS_OFF;
        drm_crtc_helper_add(&intel_crtc->base, &intel_helper_funcs);

        intel_crtc->mode_set.crtc = &intel_crtc->base;
        intel_crtc->mode_set.connectors = (struct drm_connector **)(intel_crtc + 1);
        intel_crtc->mode_set.num_connectors = 0;

        if (i915_fbpercrtc) {



        }
}

int intel_get_pipe_from_crtc_id(struct drm_device *dev, void *data,
                                struct drm_file *file_priv)
{
        drm_i915_private_t *dev_priv = dev->dev_private;
        struct drm_i915_get_pipe_from_crtc_id *pipe_from_crtc_id = data;
        struct drm_crtc *crtc = NULL;
        int pipe = -1;

        if (!dev_priv) {
                DRM_ERROR("called with no initialization\n");
                return -EINVAL;
        }

        list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
                struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
                if (crtc->base.id == pipe_from_crtc_id->crtc_id) {
                        pipe = intel_crtc->pipe;
                        break;
                }
        }

        if (pipe == -1) {
                DRM_ERROR("no such CRTC id\n");
                return -EINVAL;
        }

        pipe_from_crtc_id->pipe = pipe;

       return 0;
}

struct drm_crtc *intel_get_crtc_from_pipe(struct drm_device *dev, int pipe)
{
        struct drm_crtc *crtc = NULL;

        list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
                struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
                if (intel_crtc->pipe == pipe)
                        break;
        }
        return crtc;
}

static int intel_connector_clones(struct drm_device *dev, int type_mask)
{
        int index_mask = 0;
        struct drm_connector *connector;
        int entry = 0;

        list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
                struct intel_output *intel_output = to_intel_output(connector);
                if (type_mask & (1 << intel_output->type))
                        index_mask |= (1 << entry);
                entry++;
        }
        return index_mask;
}


static void intel_setup_outputs(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct drm_connector *connector;

        intel_crt_init(dev);

        /* Set up integrated LVDS */
        if (IS_MOBILE(dev) && !IS_I830(dev))
                intel_lvds_init(dev);

        if (IS_I9XX(dev)) {
                int found;
                u32 reg;

                if (I915_READ(SDVOB) & SDVO_DETECTED) {
                        found = intel_sdvo_init(dev, SDVOB);
                        if (!found && SUPPORTS_INTEGRATED_HDMI(dev))
                                intel_hdmi_init(dev, SDVOB);
                }

                /* Before G4X SDVOC doesn't have its own detect register */
                if (IS_G4X(dev))
                        reg = SDVOC;
                else
                        reg = SDVOB;

                if (I915_READ(reg) & SDVO_DETECTED) {
                        found = intel_sdvo_init(dev, SDVOC);
                        if (!found && SUPPORTS_INTEGRATED_HDMI(dev))
                                intel_hdmi_init(dev, SDVOC);
                }
        } else
                intel_dvo_init(dev);

        if (IS_I9XX(dev) && IS_MOBILE(dev))
                intel_tv_init(dev);

        list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
                struct intel_output *intel_output = to_intel_output(connector);
                struct drm_encoder *encoder = &intel_output->enc;
                int crtc_mask = 0, clone_mask = 0;

                /* valid crtcs */
                switch(intel_output->type) {
                case INTEL_OUTPUT_HDMI:
                        crtc_mask = ((1 << 0)|
                                     (1 << 1));
                        clone_mask = ((1 << INTEL_OUTPUT_HDMI));
                        break;
                case INTEL_OUTPUT_DVO:
                case INTEL_OUTPUT_SDVO:
                        crtc_mask = ((1 << 0)|
                                     (1 << 1));
                        clone_mask = ((1 << INTEL_OUTPUT_ANALOG) |
                                      (1 << INTEL_OUTPUT_DVO) |
                                      (1 << INTEL_OUTPUT_SDVO));
                        break;
                case INTEL_OUTPUT_ANALOG:
                        crtc_mask = ((1 << 0)|
                                     (1 << 1));
                        clone_mask = ((1 << INTEL_OUTPUT_ANALOG) |
                                      (1 << INTEL_OUTPUT_DVO) |
                                      (1 << INTEL_OUTPUT_SDVO));
                        break;
                case INTEL_OUTPUT_LVDS:
                        crtc_mask = (1 << 1);
                        clone_mask = (1 << INTEL_OUTPUT_LVDS);
                        break;
                case INTEL_OUTPUT_TVOUT:
                        crtc_mask = ((1 << 0) |
                                     (1 << 1));
                        clone_mask = (1 << INTEL_OUTPUT_TVOUT);
                        break;
                }
                encoder->possible_crtcs = crtc_mask;
                encoder->possible_clones = intel_connector_clones(dev, clone_mask);
        }
}

static void intel_user_framebuffer_destroy(struct drm_framebuffer *fb)
{
        struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);
        struct drm_device *dev = fb->dev;

        if (fb->fbdev)
                intelfb_remove(dev, fb);

        drm_framebuffer_cleanup(fb);
        mutex_lock(&dev->struct_mutex);
        drm_gem_object_unreference(intel_fb->obj);
        mutex_unlock(&dev->struct_mutex);

        kfree(intel_fb);
}

static int intel_user_framebuffer_create_handle(struct drm_framebuffer *fb,
                                                struct drm_file *file_priv,
                                                unsigned int *handle)
{
        struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);
        struct drm_gem_object *object = intel_fb->obj;

        return drm_gem_handle_create(file_priv, object, handle);
}

static const struct drm_framebuffer_funcs intel_fb_funcs = {
        .destroy = intel_user_framebuffer_destroy,
        .create_handle = intel_user_framebuffer_create_handle,
};

int intel_framebuffer_create(struct drm_device *dev,
                             struct drm_mode_fb_cmd *mode_cmd,
                             struct drm_framebuffer **fb,
                             struct drm_gem_object *obj)
{
        struct intel_framebuffer *intel_fb;
        int ret;

        intel_fb = kzalloc(sizeof(*intel_fb), GFP_KERNEL);
        if (!intel_fb)
                return -ENOMEM;

        ret = drm_framebuffer_init(dev, &intel_fb->base, &intel_fb_funcs);
        if (ret) {
                DRM_ERROR("framebuffer init failed %d\n", ret);
                return ret;
        }

        drm_helper_mode_fill_fb_struct(&intel_fb->base, mode_cmd);

        intel_fb->obj = obj;

        *fb = &intel_fb->base;

        return 0;
}


static struct drm_framebuffer *
intel_user_framebuffer_create(struct drm_device *dev,
                              struct drm_file *filp,
                              struct drm_mode_fb_cmd *mode_cmd)
{
        struct drm_gem_object *obj;
        struct drm_framebuffer *fb;
        int ret;

        obj = drm_gem_object_lookup(dev, filp, mode_cmd->handle);
        if (!obj)
                return NULL;

        ret = intel_framebuffer_create(dev, mode_cmd, &fb, obj);
        if (ret) {
                mutex_lock(&dev->struct_mutex);
                drm_gem_object_unreference(obj);
                mutex_unlock(&dev->struct_mutex);
                return NULL;
        }

        return fb;
}

static const struct drm_mode_config_funcs intel_mode_funcs = {
        .fb_create = intel_user_framebuffer_create,
        .fb_changed = intelfb_probe,
};

void intel_modeset_init(struct drm_device *dev)
{
        int num_pipe;
        int i;

        drm_mode_config_init(dev);

        dev->mode_config.min_width = 0;
        dev->mode_config.min_height = 0;

        dev->mode_config.funcs = (void *)&intel_mode_funcs;

        if (IS_I965G(dev)) {
                dev->mode_config.max_width = 8192;
                dev->mode_config.max_height = 8192;
        } else {
                dev->mode_config.max_width = 2048;
                dev->mode_config.max_height = 2048;
        }

        /* set memory base */
        if (IS_I9XX(dev))
                dev->mode_config.fb_base = pci_resource_start(dev->pdev, 2);
        else
                dev->mode_config.fb_base = pci_resource_start(dev->pdev, 0);

        if (IS_MOBILE(dev) || IS_I9XX(dev))
                num_pipe = 2;
        else
                num_pipe = 1;
        DRM_DEBUG("%d display pipe%s available.\n",
                  num_pipe, num_pipe > 1 ? "s" : "");

        for (i = 0; i < num_pipe; i++) {
                intel_crtc_init(dev, i);
        }

        intel_setup_outputs(dev);
}

void intel_modeset_cleanup(struct drm_device *dev)
{
        drm_mode_config_cleanup(dev);
}


/* current intel driver doesn't take advantage of encoders
   always give back the encoder for the connector
*/
struct drm_encoder *intel_best_encoder(struct drm_connector *connector)
{
        struct intel_output *intel_output = to_intel_output(connector);

        return &intel_output->enc;
}