/*
 * Copyright 2006 Dave Airlie <airlied@linux.ie>
 * Copyright © 2006-2007 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>
 */
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/export.h>
#include <drm/drmP.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
#include <drm/drm_edid.h>
#include "intel_drv.h"
#include <drm/i915_drm.h>
#include "i915_drv.h"
#include "intel_sdvo_regs.h"

#define SDVO_TMDS_MASK (SDVO_OUTPUT_TMDS0 | SDVO_OUTPUT_TMDS1)
#define SDVO_RGB_MASK  (SDVO_OUTPUT_RGB0 | SDVO_OUTPUT_RGB1)
#define SDVO_LVDS_MASK (SDVO_OUTPUT_LVDS0 | SDVO_OUTPUT_LVDS1)
#define SDVO_TV_MASK   (SDVO_OUTPUT_CVBS0 | SDVO_OUTPUT_SVID0 | SDVO_OUTPUT_YPRPB0)

#define SDVO_OUTPUT_MASK (SDVO_TMDS_MASK | SDVO_RGB_MASK | SDVO_LVDS_MASK |\
                        SDVO_TV_MASK)

#define IS_TV(c)        (c->output_flag & SDVO_TV_MASK)
#define IS_TMDS(c)      (c->output_flag & SDVO_TMDS_MASK)
#define IS_LVDS(c)      (c->output_flag & SDVO_LVDS_MASK)
#define IS_TV_OR_LVDS(c) (c->output_flag & (SDVO_TV_MASK | SDVO_LVDS_MASK))
#define IS_DIGITAL(c) (c->output_flag & (SDVO_TMDS_MASK | SDVO_LVDS_MASK))


static const char * const tv_format_names[] = {
        "NTSC_M"   , "NTSC_J"  , "NTSC_443",
        "PAL_B"    , "PAL_D"   , "PAL_G"   ,
        "PAL_H"    , "PAL_I"   , "PAL_M"   ,
        "PAL_N"    , "PAL_NC"  , "PAL_60"  ,
        "SECAM_B"  , "SECAM_D" , "SECAM_G" ,
        "SECAM_K"  , "SECAM_K1", "SECAM_L" ,
        "SECAM_60"
};

#define TV_FORMAT_NUM  ARRAY_SIZE(tv_format_names)

struct intel_sdvo {
        struct intel_encoder base;

        struct i2c_adapter *i2c;
        u8 slave_addr;

        struct i2c_adapter ddc;

        /* Register for the SDVO device: SDVOB or SDVOC */
        i915_reg_t sdvo_reg;

        /* Active outputs controlled by this SDVO output */
        uint16_t controlled_output;

        /*
         * Capabilities of the SDVO device returned by
         * intel_sdvo_get_capabilities()
         */
        struct intel_sdvo_caps caps;

        /* Pixel clock limitations reported by the SDVO device, in kHz */
        int pixel_clock_min, pixel_clock_max;

        /*
        * For multiple function SDVO device,
        * this is for current attached outputs.
        */
        uint16_t attached_output;

        /*
         * Hotplug activation bits for this device
         */
        uint16_t hotplug_active;

        /**
         * This is set if we're going to treat the device as TV-out.
         *
         * While we have these nice friendly flags for output types that ought
         * to decide this for us, the S-Video output on our HDMI+S-Video card
         * shows up as RGB1 (VGA).
         */
        bool is_tv;

        enum port port;

        /**
         * This is set if we treat the device as HDMI, instead of DVI.
         */
        bool is_hdmi;
        bool has_hdmi_monitor;
        bool has_hdmi_audio;
        bool rgb_quant_range_selectable;

        /**
         * This is set if we detect output of sdvo device as LVDS and
         * have a valid fixed mode to use with the panel.
         */
        bool is_lvds;

        /**
         * This is sdvo fixed pannel mode pointer
         */
        struct drm_display_mode *sdvo_lvds_fixed_mode;

        /* DDC bus used by this SDVO encoder */
        uint8_t ddc_bus;

        /*
         * the sdvo flag gets lost in round trip: dtd->adjusted_mode->dtd
         */
        uint8_t dtd_sdvo_flags;
};

struct intel_sdvo_connector {
        struct intel_connector base;

        /* Mark the type of connector */
        uint16_t output_flag;

        /* This contains all current supported TV format */
        u8 tv_format_supported[TV_FORMAT_NUM];
        int   format_supported_num;
        struct drm_property *tv_format;

        /* add the property for the SDVO-TV */
        struct drm_property *left;
        struct drm_property *right;
        struct drm_property *top;
        struct drm_property *bottom;
        struct drm_property *hpos;
        struct drm_property *vpos;
        struct drm_property *contrast;
        struct drm_property *saturation;
        struct drm_property *hue;
        struct drm_property *sharpness;
        struct drm_property *flicker_filter;
        struct drm_property *flicker_filter_adaptive;
        struct drm_property *flicker_filter_2d;
        struct drm_property *tv_chroma_filter;
        struct drm_property *tv_luma_filter;
        struct drm_property *dot_crawl;

        /* add the property for the SDVO-TV/LVDS */
        struct drm_property *brightness;

        /* this is to get the range of margin.*/
        u32 max_hscan, max_vscan;
};

struct intel_sdvo_connector_state {
        /* base.base: tv.saturation/contrast/hue/brightness */
        struct intel_digital_connector_state base;

        struct {
                unsigned overscan_h, overscan_v, hpos, vpos, sharpness;
                unsigned flicker_filter, flicker_filter_2d, flicker_filter_adaptive;
                unsigned chroma_filter, luma_filter, dot_crawl;
        } tv;
};

static struct intel_sdvo *to_sdvo(struct intel_encoder *encoder)
{
        return container_of(encoder, struct intel_sdvo, base);
}

static struct intel_sdvo *intel_attached_sdvo(struct drm_connector *connector)
{
        return to_sdvo(intel_attached_encoder(connector));
}

static struct intel_sdvo_connector *
to_intel_sdvo_connector(struct drm_connector *connector)
{
        return container_of(connector, struct intel_sdvo_connector, base.base);
}

#define to_intel_sdvo_connector_state(conn_state) \
        container_of((conn_state), struct intel_sdvo_connector_state, base.base)

static bool
intel_sdvo_output_setup(struct intel_sdvo *intel_sdvo, uint16_t flags);
static bool
intel_sdvo_tv_create_property(struct intel_sdvo *intel_sdvo,
                              struct intel_sdvo_connector *intel_sdvo_connector,
                              int type);
static bool
intel_sdvo_create_enhance_property(struct intel_sdvo *intel_sdvo,
                                   struct intel_sdvo_connector *intel_sdvo_connector);

/*
 * Writes the SDVOB or SDVOC with the given value, but always writes both
 * SDVOB and SDVOC to work around apparent hardware issues (according to
 * comments in the BIOS).
 */
static void intel_sdvo_write_sdvox(struct intel_sdvo *intel_sdvo, u32 val)
{
        struct drm_device *dev = intel_sdvo->base.base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        u32 bval = val, cval = val;
        int i;

        if (HAS_PCH_SPLIT(dev_priv)) {
                I915_WRITE(intel_sdvo->sdvo_reg, val);
                POSTING_READ(intel_sdvo->sdvo_reg);
                /*
                 * HW workaround, need to write this twice for issue
                 * that may result in first write getting masked.
                 */
                if (HAS_PCH_IBX(dev_priv)) {
                        I915_WRITE(intel_sdvo->sdvo_reg, val);
                        POSTING_READ(intel_sdvo->sdvo_reg);
                }
                return;
        }

        if (intel_sdvo->port == PORT_B)
                cval = I915_READ(GEN3_SDVOC);
        else
                bval = I915_READ(GEN3_SDVOB);

        /*
         * Write the registers twice for luck. Sometimes,
         * writing them only once doesn't appear to 'stick'.
         * The BIOS does this too. Yay, magic
         */
        for (i = 0; i < 2; i++) {
                I915_WRITE(GEN3_SDVOB, bval);
                POSTING_READ(GEN3_SDVOB);

                I915_WRITE(GEN3_SDVOC, cval);
                POSTING_READ(GEN3_SDVOC);
        }
}

static bool intel_sdvo_read_byte(struct intel_sdvo *intel_sdvo, u8 addr, u8 *ch)
{
        struct i2c_msg msgs[] = {
                {
                        .addr = intel_sdvo->slave_addr,
                        .flags = 0,
                        .len = 1,
                        .buf = &addr,
                },
                {
                        .addr = intel_sdvo->slave_addr,
                        .flags = I2C_M_RD,
                        .len = 1,
                        .buf = ch,
                }
        };
        int ret;

        if ((ret = i2c_transfer(intel_sdvo->i2c, msgs, 2)) == 2)
                return true;

        DRM_DEBUG_KMS("i2c transfer returned %d\n", ret);
        return false;
}

#define SDVO_CMD_NAME_ENTRY(cmd) {cmd, #cmd}
/** Mapping of command numbers to names, for debug output */
static const struct _sdvo_cmd_name {
        u8 cmd;
        const char *name;
} __attribute__ ((packed)) sdvo_cmd_names[] = {
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_RESET),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_DEVICE_CAPS),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_FIRMWARE_REV),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_TRAINED_INPUTS),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_ACTIVE_OUTPUTS),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_ACTIVE_OUTPUTS),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_IN_OUT_MAP),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_IN_OUT_MAP),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_ATTACHED_DISPLAYS),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_HOT_PLUG_SUPPORT),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_ACTIVE_HOT_PLUG),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_ACTIVE_HOT_PLUG),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_INTERRUPT_EVENT_SOURCE),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_TARGET_INPUT),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_TARGET_OUTPUT),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_INPUT_TIMINGS_PART1),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_INPUT_TIMINGS_PART2),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_INPUT_TIMINGS_PART1),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_INPUT_TIMINGS_PART2),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_INPUT_TIMINGS_PART1),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_OUTPUT_TIMINGS_PART1),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_OUTPUT_TIMINGS_PART2),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_OUTPUT_TIMINGS_PART1),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_OUTPUT_TIMINGS_PART2),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_CREATE_PREFERRED_INPUT_TIMING),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_PREFERRED_INPUT_TIMING_PART1),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_PREFERRED_INPUT_TIMING_PART2),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_INPUT_PIXEL_CLOCK_RANGE),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_OUTPUT_PIXEL_CLOCK_RANGE),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_SUPPORTED_CLOCK_RATE_MULTS),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_CLOCK_RATE_MULT),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_CLOCK_RATE_MULT),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_SUPPORTED_TV_FORMATS),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_TV_FORMAT),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_TV_FORMAT),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_SUPPORTED_POWER_STATES),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_POWER_STATE),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_ENCODER_POWER_STATE),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_DISPLAY_POWER_STATE),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_CONTROL_BUS_SWITCH),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_SDTV_RESOLUTION_SUPPORT),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_SCALED_HDTV_RESOLUTION_SUPPORT),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_SUPPORTED_ENHANCEMENTS),

        /* Add the op code for SDVO enhancements */
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_MAX_HPOS),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_HPOS),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_HPOS),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_MAX_VPOS),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_VPOS),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_VPOS),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_MAX_SATURATION),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_SATURATION),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_SATURATION),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_MAX_HUE),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_HUE),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_HUE),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_MAX_CONTRAST),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_CONTRAST),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_CONTRAST),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_MAX_BRIGHTNESS),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_BRIGHTNESS),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_BRIGHTNESS),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_MAX_OVERSCAN_H),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_OVERSCAN_H),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_OVERSCAN_H),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_MAX_OVERSCAN_V),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_OVERSCAN_V),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_OVERSCAN_V),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_MAX_FLICKER_FILTER),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_FLICKER_FILTER),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_FLICKER_FILTER),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_MAX_FLICKER_FILTER_ADAPTIVE),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_FLICKER_FILTER_ADAPTIVE),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_FLICKER_FILTER_ADAPTIVE),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_MAX_FLICKER_FILTER_2D),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_FLICKER_FILTER_2D),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_FLICKER_FILTER_2D),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_MAX_SHARPNESS),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_SHARPNESS),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_SHARPNESS),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_DOT_CRAWL),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_DOT_CRAWL),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_MAX_TV_CHROMA_FILTER),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_TV_CHROMA_FILTER),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_TV_CHROMA_FILTER),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_MAX_TV_LUMA_FILTER),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_TV_LUMA_FILTER),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_TV_LUMA_FILTER),

        /* HDMI op code */
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_SUPP_ENCODE),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_ENCODE),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_ENCODE),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_PIXEL_REPLI),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_PIXEL_REPLI),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_COLORIMETRY_CAP),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_COLORIMETRY),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_COLORIMETRY),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_AUDIO_ENCRYPT_PREFER),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_AUDIO_STAT),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_AUDIO_STAT),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_HBUF_INDEX),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_HBUF_INDEX),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_HBUF_INFO),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_HBUF_AV_SPLIT),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_HBUF_AV_SPLIT),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_HBUF_TXRATE),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_HBUF_TXRATE),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_SET_HBUF_DATA),
        SDVO_CMD_NAME_ENTRY(SDVO_CMD_GET_HBUF_DATA),
};

#define SDVO_NAME(svdo) ((svdo)->port == PORT_B ? "SDVOB" : "SDVOC")

static void intel_sdvo_debug_write(struct intel_sdvo *intel_sdvo, u8 cmd,
                                   const void *args, int args_len)
{
        int i, pos = 0;
#define BUF_LEN 256
        char buffer[BUF_LEN];

#define BUF_PRINT(args...) \
        pos += snprintf(buffer + pos, max_t(int, BUF_LEN - pos, 0), args)


        for (i = 0; i < args_len; i++) {
                BUF_PRINT("%02X ", ((u8 *)args)[i]);
        }
        for (; i < 8; i++) {
                BUF_PRINT("   ");
        }
        for (i = 0; i < ARRAY_SIZE(sdvo_cmd_names); i++) {
                if (cmd == sdvo_cmd_names[i].cmd) {
                        BUF_PRINT("(%s)", sdvo_cmd_names[i].name);
                        break;
                }
        }
        if (i == ARRAY_SIZE(sdvo_cmd_names)) {
                BUF_PRINT("(%02X)", cmd);
        }
        BUG_ON(pos >= BUF_LEN - 1);
#undef BUF_PRINT
#undef BUF_LEN

        DRM_DEBUG_KMS("%s: W: %02X %s\n", SDVO_NAME(intel_sdvo), cmd, buffer);
}

static const char * const cmd_status_names[] = {
        "Power on",
        "Success",
        "Not supported",
        "Invalid arg",
        "Pending",
        "Target not specified",
        "Scaling not supported"
};

static bool intel_sdvo_write_cmd(struct intel_sdvo *intel_sdvo, u8 cmd,
                                 const void *args, int args_len)
{
        u8 *buf, status;
        struct i2c_msg *msgs;
        int i, ret = true;

        /* Would be simpler to allocate both in one go ? */
        buf = kzalloc(args_len * 2 + 2, GFP_KERNEL);
        if (!buf)
                return false;

        msgs = kcalloc(args_len + 3, sizeof(*msgs), GFP_KERNEL);
        if (!msgs) {
                kfree(buf);
                return false;
        }

        intel_sdvo_debug_write(intel_sdvo, cmd, args, args_len);

        for (i = 0; i < args_len; i++) {
                msgs[i].addr = intel_sdvo->slave_addr;
                msgs[i].flags = 0;
                msgs[i].len = 2;
                msgs[i].buf = buf + 2 *i;
                buf[2*i + 0] = SDVO_I2C_ARG_0 - i;
                buf[2*i + 1] = ((u8*)args)[i];
        }
        msgs[i].addr = intel_sdvo->slave_addr;
        msgs[i].flags = 0;
        msgs[i].len = 2;
        msgs[i].buf = buf + 2*i;
        buf[2*i + 0] = SDVO_I2C_OPCODE;
        buf[2*i + 1] = cmd;

        /* the following two are to read the response */
        status = SDVO_I2C_CMD_STATUS;
        msgs[i+1].addr = intel_sdvo->slave_addr;
        msgs[i+1].flags = 0;
        msgs[i+1].len = 1;
        msgs[i+1].buf = &status;

        msgs[i+2].addr = intel_sdvo->slave_addr;
        msgs[i+2].flags = I2C_M_RD;
        msgs[i+2].len = 1;
        msgs[i+2].buf = &status;

        ret = i2c_transfer(intel_sdvo->i2c, msgs, i+3);
        if (ret < 0) {
                DRM_DEBUG_KMS("I2c transfer returned %d\n", ret);
                ret = false;
                goto out;
        }
        if (ret != i+3) {
                /* failure in I2C transfer */
                DRM_DEBUG_KMS("I2c transfer returned %d/%d\n", ret, i+3);
                ret = false;
        }

out:
        kfree(msgs);
        kfree(buf);
        return ret;
}

static bool intel_sdvo_read_response(struct intel_sdvo *intel_sdvo,
                                     void *response, int response_len)
{
        u8 retry = 15; /* 5 quick checks, followed by 10 long checks */
        u8 status;
        int i, pos = 0;
#define BUF_LEN 256
        char buffer[BUF_LEN];


        /*
         * The documentation states that all commands will be
         * processed within 15µs, and that we need only poll
         * the status byte a maximum of 3 times in order for the
         * command to be complete.
         *
         * Check 5 times in case the hardware failed to read the docs.
         *
         * Also beware that the first response by many devices is to
         * reply PENDING and stall for time. TVs are notorious for
         * requiring longer than specified to complete their replies.
         * Originally (in the DDX long ago), the delay was only ever 15ms
         * with an additional delay of 30ms applied for TVs added later after
         * many experiments. To accommodate both sets of delays, we do a
         * sequence of slow checks if the device is falling behind and fails
         * to reply within 5*15µs.
         */
        if (!intel_sdvo_read_byte(intel_sdvo,
                                  SDVO_I2C_CMD_STATUS,
                                  &status))
                goto log_fail;

        while ((status == SDVO_CMD_STATUS_PENDING ||
                status == SDVO_CMD_STATUS_TARGET_NOT_SPECIFIED) && --retry) {
                if (retry < 10)
                        msleep(15);
                else
                        udelay(15);

                if (!intel_sdvo_read_byte(intel_sdvo,
                                          SDVO_I2C_CMD_STATUS,
                                          &status))
                        goto log_fail;
        }

#define BUF_PRINT(args...) \
        pos += snprintf(buffer + pos, max_t(int, BUF_LEN - pos, 0), args)

        if (status <= SDVO_CMD_STATUS_SCALING_NOT_SUPP)
                BUF_PRINT("(%s)", cmd_status_names[status]);
        else
                BUF_PRINT("(??? %d)", status);

        if (status != SDVO_CMD_STATUS_SUCCESS)
                goto log_fail;

        /* Read the command response */
        for (i = 0; i < response_len; i++) {
                if (!intel_sdvo_read_byte(intel_sdvo,
                                          SDVO_I2C_RETURN_0 + i,
                                          &((u8 *)response)[i]))
                        goto log_fail;
                BUF_PRINT(" %02X", ((u8 *)response)[i]);
        }
        BUG_ON(pos >= BUF_LEN - 1);
#undef BUF_PRINT
#undef BUF_LEN

        DRM_DEBUG_KMS("%s: R: %s\n", SDVO_NAME(intel_sdvo), buffer);
        return true;

log_fail:
        DRM_DEBUG_KMS("%s: R: ... failed\n", SDVO_NAME(intel_sdvo));
        return false;
}

static int intel_sdvo_get_pixel_multiplier(const struct drm_display_mode *adjusted_mode)
{
        if (adjusted_mode->crtc_clock >= 100000)
                return 1;
        else if (adjusted_mode->crtc_clock >= 50000)
                return 2;
        else
                return 4;
}

static bool intel_sdvo_set_control_bus_switch(struct intel_sdvo *intel_sdvo,
                                              u8 ddc_bus)
{
        /* This must be the immediately preceding write before the i2c xfer */
        return intel_sdvo_write_cmd(intel_sdvo,
                                    SDVO_CMD_SET_CONTROL_BUS_SWITCH,
                                    &ddc_bus, 1);
}

static bool intel_sdvo_set_value(struct intel_sdvo *intel_sdvo, u8 cmd, const void *data, int len)
{
        if (!intel_sdvo_write_cmd(intel_sdvo, cmd, data, len))
                return false;

        return intel_sdvo_read_response(intel_sdvo, NULL, 0);
}

static bool
intel_sdvo_get_value(struct intel_sdvo *intel_sdvo, u8 cmd, void *value, int len)
{
        if (!intel_sdvo_write_cmd(intel_sdvo, cmd, NULL, 0))
                return false;

        return intel_sdvo_read_response(intel_sdvo, value, len);
}

static bool intel_sdvo_set_target_input(struct intel_sdvo *intel_sdvo)
{
        struct intel_sdvo_set_target_input_args targets = {0};
        return intel_sdvo_set_value(intel_sdvo,
                                    SDVO_CMD_SET_TARGET_INPUT,
                                    &targets, sizeof(targets));
}

/*
 * Return whether each input is trained.
 *
 * This function is making an assumption about the layout of the response,
 * which should be checked against the docs.
 */
static bool intel_sdvo_get_trained_inputs(struct intel_sdvo *intel_sdvo, bool *input_1, bool *input_2)
{
        struct intel_sdvo_get_trained_inputs_response response;

        BUILD_BUG_ON(sizeof(response) != 1);
        if (!intel_sdvo_get_value(intel_sdvo, SDVO_CMD_GET_TRAINED_INPUTS,
                                  &response, sizeof(response)))
                return false;

        *input_1 = response.input0_trained;
        *input_2 = response.input1_trained;
        return true;
}

static bool intel_sdvo_set_active_outputs(struct intel_sdvo *intel_sdvo,
                                          u16 outputs)
{
        return intel_sdvo_set_value(intel_sdvo,
                                    SDVO_CMD_SET_ACTIVE_OUTPUTS,
                                    &outputs, sizeof(outputs));
}

static bool intel_sdvo_get_active_outputs(struct intel_sdvo *intel_sdvo,
                                          u16 *outputs)
{
        return intel_sdvo_get_value(intel_sdvo,
                                    SDVO_CMD_GET_ACTIVE_OUTPUTS,
                                    outputs, sizeof(*outputs));
}

static bool intel_sdvo_set_encoder_power_state(struct intel_sdvo *intel_sdvo,
                                               int mode)
{
        u8 state = SDVO_ENCODER_STATE_ON;

        switch (mode) {
        case DRM_MODE_DPMS_ON:
                state = SDVO_ENCODER_STATE_ON;
                break;
        case DRM_MODE_DPMS_STANDBY:
                state = SDVO_ENCODER_STATE_STANDBY;
                break;
        case DRM_MODE_DPMS_SUSPEND:
                state = SDVO_ENCODER_STATE_SUSPEND;
                break;
        case DRM_MODE_DPMS_OFF:
                state = SDVO_ENCODER_STATE_OFF;
                break;
        }

        return intel_sdvo_set_value(intel_sdvo,
                                    SDVO_CMD_SET_ENCODER_POWER_STATE, &state, sizeof(state));
}

static bool intel_sdvo_get_input_pixel_clock_range(struct intel_sdvo *intel_sdvo,
                                                   int *clock_min,
                                                   int *clock_max)
{
        struct intel_sdvo_pixel_clock_range clocks;

        BUILD_BUG_ON(sizeof(clocks) != 4);
        if (!intel_sdvo_get_value(intel_sdvo,
                                  SDVO_CMD_GET_INPUT_PIXEL_CLOCK_RANGE,
                                  &clocks, sizeof(clocks)))
                return false;

        /* Convert the values from units of 10 kHz to kHz. */
        *clock_min = clocks.min * 10;
        *clock_max = clocks.max * 10;
        return true;
}

static bool intel_sdvo_set_target_output(struct intel_sdvo *intel_sdvo,
                                         u16 outputs)
{
        return intel_sdvo_set_value(intel_sdvo,
                                    SDVO_CMD_SET_TARGET_OUTPUT,
                                    &outputs, sizeof(outputs));
}

static bool intel_sdvo_set_timing(struct intel_sdvo *intel_sdvo, u8 cmd,
                                  struct intel_sdvo_dtd *dtd)
{
        return intel_sdvo_set_value(intel_sdvo, cmd, &dtd->part1, sizeof(dtd->part1)) &&
                intel_sdvo_set_value(intel_sdvo, cmd + 1, &dtd->part2, sizeof(dtd->part2));
}

static bool intel_sdvo_get_timing(struct intel_sdvo *intel_sdvo, u8 cmd,
                                  struct intel_sdvo_dtd *dtd)
{
        return intel_sdvo_get_value(intel_sdvo, cmd, &dtd->part1, sizeof(dtd->part1)) &&
                intel_sdvo_get_value(intel_sdvo, cmd + 1, &dtd->part2, sizeof(dtd->part2));
}

static bool intel_sdvo_set_input_timing(struct intel_sdvo *intel_sdvo,
                                         struct intel_sdvo_dtd *dtd)
{
        return intel_sdvo_set_timing(intel_sdvo,
                                     SDVO_CMD_SET_INPUT_TIMINGS_PART1, dtd);
}

static bool intel_sdvo_set_output_timing(struct intel_sdvo *intel_sdvo,
                                         struct intel_sdvo_dtd *dtd)
{
        return intel_sdvo_set_timing(intel_sdvo,
                                     SDVO_CMD_SET_OUTPUT_TIMINGS_PART1, dtd);
}

static bool intel_sdvo_get_input_timing(struct intel_sdvo *intel_sdvo,
                                        struct intel_sdvo_dtd *dtd)
{
        return intel_sdvo_get_timing(intel_sdvo,
                                     SDVO_CMD_GET_INPUT_TIMINGS_PART1, dtd);
}

static bool
intel_sdvo_create_preferred_input_timing(struct intel_sdvo *intel_sdvo,
                                         uint16_t clock,
                                         uint16_t width,
                                         uint16_t height)
{
        struct intel_sdvo_preferred_input_timing_args args;

        memset(&args, 0, sizeof(args));
        args.clock = clock;
        args.width = width;
        args.height = height;
        args.interlace = 0;

        if (intel_sdvo->is_lvds &&
           (intel_sdvo->sdvo_lvds_fixed_mode->hdisplay != width ||
            intel_sdvo->sdvo_lvds_fixed_mode->vdisplay != height))
                args.scaled = 1;

        return intel_sdvo_set_value(intel_sdvo,
                                    SDVO_CMD_CREATE_PREFERRED_INPUT_TIMING,
                                    &args, sizeof(args));
}

static bool intel_sdvo_get_preferred_input_timing(struct intel_sdvo *intel_sdvo,
                                                  struct intel_sdvo_dtd *dtd)
{
        BUILD_BUG_ON(sizeof(dtd->part1) != 8);
        BUILD_BUG_ON(sizeof(dtd->part2) != 8);
        return intel_sdvo_get_value(intel_sdvo, SDVO_CMD_GET_PREFERRED_INPUT_TIMING_PART1,
                                    &dtd->part1, sizeof(dtd->part1)) &&
                intel_sdvo_get_value(intel_sdvo, SDVO_CMD_GET_PREFERRED_INPUT_TIMING_PART2,
                                     &dtd->part2, sizeof(dtd->part2));
}

static bool intel_sdvo_set_clock_rate_mult(struct intel_sdvo *intel_sdvo, u8 val)
{
        return intel_sdvo_set_value(intel_sdvo, SDVO_CMD_SET_CLOCK_RATE_MULT, &val, 1);
}

static void intel_sdvo_get_dtd_from_mode(struct intel_sdvo_dtd *dtd,
                                         const struct drm_display_mode *mode)
{
        uint16_t width, height;
        uint16_t h_blank_len, h_sync_len, v_blank_len, v_sync_len;
        uint16_t h_sync_offset, v_sync_offset;
        int mode_clock;

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

        width = mode->hdisplay;
        height = mode->vdisplay;

        /* do some mode translations */
        h_blank_len = mode->htotal - mode->hdisplay;
        h_sync_len = mode->hsync_end - mode->hsync_start;

        v_blank_len = mode->vtotal - mode->vdisplay;
        v_sync_len = mode->vsync_end - mode->vsync_start;

        h_sync_offset = mode->hsync_start - mode->hdisplay;
        v_sync_offset = mode->vsync_start - mode->vdisplay;

        mode_clock = mode->clock;
        mode_clock /= 10;
        dtd->part1.clock = mode_clock;

        dtd->part1.h_active = width & 0xff;
        dtd->part1.h_blank = h_blank_len & 0xff;
        dtd->part1.h_high = (((width >> 8) & 0xf) << 4) |
                ((h_blank_len >> 8) & 0xf);
        dtd->part1.v_active = height & 0xff;
        dtd->part1.v_blank = v_blank_len & 0xff;
        dtd->part1.v_high = (((height >> 8) & 0xf) << 4) |
                ((v_blank_len >> 8) & 0xf);

        dtd->part2.h_sync_off = h_sync_offset & 0xff;
        dtd->part2.h_sync_width = h_sync_len & 0xff;
        dtd->part2.v_sync_off_width = (v_sync_offset & 0xf) << 4 |
                (v_sync_len & 0xf);
        dtd->part2.sync_off_width_high = ((h_sync_offset & 0x300) >> 2) |
                ((h_sync_len & 0x300) >> 4) | ((v_sync_offset & 0x30) >> 2) |
                ((v_sync_len & 0x30) >> 4);

        dtd->part2.dtd_flags = 0x18;
        if (mode->flags & DRM_MODE_FLAG_INTERLACE)
                dtd->part2.dtd_flags |= DTD_FLAG_INTERLACE;
        if (mode->flags & DRM_MODE_FLAG_PHSYNC)
                dtd->part2.dtd_flags |= DTD_FLAG_HSYNC_POSITIVE;
        if (mode->flags & DRM_MODE_FLAG_PVSYNC)
                dtd->part2.dtd_flags |= DTD_FLAG_VSYNC_POSITIVE;

        dtd->part2.v_sync_off_high = v_sync_offset & 0xc0;
}

static void intel_sdvo_get_mode_from_dtd(struct drm_display_mode *pmode,
                                         const struct intel_sdvo_dtd *dtd)
{
        struct drm_display_mode mode = {};

        mode.hdisplay = dtd->part1.h_active;
        mode.hdisplay += ((dtd->part1.h_high >> 4) & 0x0f) << 8;
        mode.hsync_start = mode.hdisplay + dtd->part2.h_sync_off;
        mode.hsync_start += (dtd->part2.sync_off_width_high & 0xc0) << 2;
        mode.hsync_end = mode.hsync_start + dtd->part2.h_sync_width;
        mode.hsync_end += (dtd->part2.sync_off_width_high & 0x30) << 4;
        mode.htotal = mode.hdisplay + dtd->part1.h_blank;
        mode.htotal += (dtd->part1.h_high & 0xf) << 8;

        mode.vdisplay = dtd->part1.v_active;
        mode.vdisplay += ((dtd->part1.v_high >> 4) & 0x0f) << 8;
        mode.vsync_start = mode.vdisplay;
        mode.vsync_start += (dtd->part2.v_sync_off_width >> 4) & 0xf;
        mode.vsync_start += (dtd->part2.sync_off_width_high & 0x0c) << 2;
        mode.vsync_start += dtd->part2.v_sync_off_high & 0xc0;
        mode.vsync_end = mode.vsync_start +
                (dtd->part2.v_sync_off_width & 0xf);
        mode.vsync_end += (dtd->part2.sync_off_width_high & 0x3) << 4;
        mode.vtotal = mode.vdisplay + dtd->part1.v_blank;
        mode.vtotal += (dtd->part1.v_high & 0xf) << 8;

        mode.clock = dtd->part1.clock * 10;

        if (dtd->part2.dtd_flags & DTD_FLAG_INTERLACE)
                mode.flags |= DRM_MODE_FLAG_INTERLACE;
        if (dtd->part2.dtd_flags & DTD_FLAG_HSYNC_POSITIVE)
                mode.flags |= DRM_MODE_FLAG_PHSYNC;
        else
                mode.flags |= DRM_MODE_FLAG_NHSYNC;
        if (dtd->part2.dtd_flags & DTD_FLAG_VSYNC_POSITIVE)
                mode.flags |= DRM_MODE_FLAG_PVSYNC;
        else
                mode.flags |= DRM_MODE_FLAG_NVSYNC;

        drm_mode_set_crtcinfo(&mode, 0);

        drm_mode_copy(pmode, &mode);
}

static bool intel_sdvo_check_supp_encode(struct intel_sdvo *intel_sdvo)
{
        struct intel_sdvo_encode encode;

        BUILD_BUG_ON(sizeof(encode) != 2);
        return intel_sdvo_get_value(intel_sdvo,
                                  SDVO_CMD_GET_SUPP_ENCODE,
                                  &encode, sizeof(encode));
}

static bool intel_sdvo_set_encode(struct intel_sdvo *intel_sdvo,
                                  uint8_t mode)
{
        return intel_sdvo_set_value(intel_sdvo, SDVO_CMD_SET_ENCODE, &mode, 1);
}

static bool intel_sdvo_set_colorimetry(struct intel_sdvo *intel_sdvo,
                                       uint8_t mode)
{
        return intel_sdvo_set_value(intel_sdvo, SDVO_CMD_SET_COLORIMETRY, &mode, 1);
}

#if 0
static void intel_sdvo_dump_hdmi_buf(struct intel_sdvo *intel_sdvo)
{
        int i, j;
        uint8_t set_buf_index[2];
        uint8_t av_split;
        uint8_t buf_size;
        uint8_t buf[48];
        uint8_t *pos;

        intel_sdvo_get_value(encoder, SDVO_CMD_GET_HBUF_AV_SPLIT, &av_split, 1);

        for (i = 0; i <= av_split; i++) {
                set_buf_index[0] = i; set_buf_index[1] = 0;
                intel_sdvo_write_cmd(encoder, SDVO_CMD_SET_HBUF_INDEX,
                                     set_buf_index, 2);
                intel_sdvo_write_cmd(encoder, SDVO_CMD_GET_HBUF_INFO, NULL, 0);
                intel_sdvo_read_response(encoder, &buf_size, 1);

                pos = buf;
                for (j = 0; j <= buf_size; j += 8) {
                        intel_sdvo_write_cmd(encoder, SDVO_CMD_GET_HBUF_DATA,
                                             NULL, 0);
                        intel_sdvo_read_response(encoder, pos, 8);
                        pos += 8;
                }
        }
}
#endif

static bool intel_sdvo_write_infoframe(struct intel_sdvo *intel_sdvo,
                                       unsigned if_index, uint8_t tx_rate,
                                       const uint8_t *data, unsigned length)
{
        uint8_t set_buf_index[2] = { if_index, 0 };
        uint8_t hbuf_size, tmp[8];
        int i;

        if (!intel_sdvo_set_value(intel_sdvo,
                                  SDVO_CMD_SET_HBUF_INDEX,
                                  set_buf_index, 2))
                return false;

        if (!intel_sdvo_get_value(intel_sdvo, SDVO_CMD_GET_HBUF_INFO,
                                  &hbuf_size, 1))
                return false;

        /* Buffer size is 0 based, hooray! */
        hbuf_size++;

        DRM_DEBUG_KMS("writing sdvo hbuf: %i, hbuf_size %i, hbuf_size: %i\n",
                      if_index, length, hbuf_size);

        for (i = 0; i < hbuf_size; i += 8) {
                memset(tmp, 0, 8);
                if (i < length)
                        memcpy(tmp, data + i, min_t(unsigned, 8, length - i));

                if (!intel_sdvo_set_value(intel_sdvo,
                                          SDVO_CMD_SET_HBUF_DATA,
                                          tmp, 8))
                        return false;
        }

        return intel_sdvo_set_value(intel_sdvo,
                                    SDVO_CMD_SET_HBUF_TXRATE,
                                    &tx_rate, 1);
}

static bool intel_sdvo_set_avi_infoframe(struct intel_sdvo *intel_sdvo,
                                         const struct intel_crtc_state *pipe_config)
{
        uint8_t sdvo_data[HDMI_INFOFRAME_SIZE(AVI)];
        union hdmi_infoframe frame;
        int ret;
        ssize_t len;

        ret = drm_hdmi_avi_infoframe_from_display_mode(&frame.avi,
                                                       &pipe_config->base.adjusted_mode,
                                                       false);
        if (ret < 0) {
                DRM_ERROR("couldn't fill AVI infoframe\n");
                return false;

        }

        if (intel_sdvo->rgb_quant_range_selectable) {
                if (pipe_config->limited_color_range)
                        frame.avi.quantization_range =
                                HDMI_QUANTIZATION_RANGE_LIMITED;
                else
                        frame.avi.quantization_range =
                                HDMI_QUANTIZATION_RANGE_FULL;
        }

        len = hdmi_infoframe_pack(&frame, sdvo_data, sizeof(sdvo_data));
        if (len < 0)
                return false;

        return intel_sdvo_write_infoframe(intel_sdvo, SDVO_HBUF_INDEX_AVI_IF,
                                          SDVO_HBUF_TX_VSYNC,
                                          sdvo_data, sizeof(sdvo_data));
}

static bool intel_sdvo_set_tv_format(struct intel_sdvo *intel_sdvo,
                                     const struct drm_connector_state *conn_state)
{
        struct intel_sdvo_tv_format format;
        uint32_t format_map;

        format_map = 1 << conn_state->tv.mode;
        memset(&format, 0, sizeof(format));
        memcpy(&format, &format_map, min(sizeof(format), sizeof(format_map)));

        BUILD_BUG_ON(sizeof(format) != 6);
        return intel_sdvo_set_value(intel_sdvo,
                                    SDVO_CMD_SET_TV_FORMAT,
                                    &format, sizeof(format));
}

static bool
intel_sdvo_set_output_timings_from_mode(struct intel_sdvo *intel_sdvo,
                                        const struct drm_display_mode *mode)
{
        struct intel_sdvo_dtd output_dtd;

        if (!intel_sdvo_set_target_output(intel_sdvo,
                                          intel_sdvo->attached_output))
                return false;

        intel_sdvo_get_dtd_from_mode(&output_dtd, mode);
        if (!intel_sdvo_set_output_timing(intel_sdvo, &output_dtd))
                return false;

        return true;
}

/*
 * Asks the sdvo controller for the preferred input mode given the output mode.
 * Unfortunately we have to set up the full output mode to do that.
 */
static bool
intel_sdvo_get_preferred_input_mode(struct intel_sdvo *intel_sdvo,
                                    const struct drm_display_mode *mode,
                                    struct drm_display_mode *adjusted_mode)
{
        struct intel_sdvo_dtd input_dtd;

        /* Reset the input timing to the screen. Assume always input 0. */
        if (!intel_sdvo_set_target_input(intel_sdvo))
                return false;

        if (!intel_sdvo_create_preferred_input_timing(intel_sdvo,
                                                      mode->clock / 10,
                                                      mode->hdisplay,
                                                      mode->vdisplay))
                return false;

        if (!intel_sdvo_get_preferred_input_timing(intel_sdvo,
                                                   &input_dtd))
                return false;

        intel_sdvo_get_mode_from_dtd(adjusted_mode, &input_dtd);
        intel_sdvo->dtd_sdvo_flags = input_dtd.part2.sdvo_flags;

        return true;
}

static void i9xx_adjust_sdvo_tv_clock(struct intel_crtc_state *pipe_config)
{
        unsigned dotclock = pipe_config->port_clock;
        struct dpll *clock = &pipe_config->dpll;

        /*
         * SDVO TV has fixed PLL values depend on its clock range,
         * this mirrors vbios setting.
         */
        if (dotclock >= 100000 && dotclock < 140500) {
                clock->p1 = 2;
                clock->p2 = 10;
                clock->n = 3;
                clock->m1 = 16;
                clock->m2 = 8;
        } else if (dotclock >= 140500 && dotclock <= 200000) {
                clock->p1 = 1;
                clock->p2 = 10;
                clock->n = 6;
                clock->m1 = 12;
                clock->m2 = 8;
        } else {
                WARN(1, "SDVO TV clock out of range: %i\n", dotclock);
        }

        pipe_config->clock_set = true;
}

static bool intel_sdvo_compute_config(struct intel_encoder *encoder,
                                      struct intel_crtc_state *pipe_config,
                                      struct drm_connector_state *conn_state)
{
        struct intel_sdvo *intel_sdvo = to_sdvo(encoder);
        struct intel_sdvo_connector_state *intel_sdvo_state =
                to_intel_sdvo_connector_state(conn_state);
        struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
        struct drm_display_mode *mode = &pipe_config->base.mode;

        DRM_DEBUG_KMS("forcing bpc to 8 for SDVO\n");
        pipe_config->pipe_bpp = 8*3;

        if (HAS_PCH_SPLIT(to_i915(encoder->base.dev)))
                pipe_config->has_pch_encoder = true;

        /*
         * We need to construct preferred input timings based on our
         * output timings.  To do that, we have to set the output
         * timings, even though this isn't really the right place in
         * the sequence to do it. Oh well.
         */
        if (intel_sdvo->is_tv) {
                if (!intel_sdvo_set_output_timings_from_mode(intel_sdvo, mode))
                        return false;

                (void) intel_sdvo_get_preferred_input_mode(intel_sdvo,
                                                           mode,
                                                           adjusted_mode);
                pipe_config->sdvo_tv_clock = true;
        } else if (intel_sdvo->is_lvds) {
                if (!intel_sdvo_set_output_timings_from_mode(intel_sdvo,
                                                             intel_sdvo->sdvo_lvds_fixed_mode))
                        return false;

                (void) intel_sdvo_get_preferred_input_mode(intel_sdvo,
                                                           mode,
                                                           adjusted_mode);
        }

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

        /*
         * Make the CRTC code factor in the SDVO pixel multiplier.  The
         * SDVO device will factor out the multiplier during mode_set.
         */
        pipe_config->pixel_multiplier =
                intel_sdvo_get_pixel_multiplier(adjusted_mode);

        if (intel_sdvo_state->base.force_audio != HDMI_AUDIO_OFF_DVI)
                pipe_config->has_hdmi_sink = intel_sdvo->has_hdmi_monitor;

        if (intel_sdvo_state->base.force_audio == HDMI_AUDIO_ON ||
            (intel_sdvo_state->base.force_audio == HDMI_AUDIO_AUTO && intel_sdvo->has_hdmi_audio))
                pipe_config->has_audio = true;

        if (intel_sdvo_state->base.broadcast_rgb == INTEL_BROADCAST_RGB_AUTO) {
                /*
                 * See CEA-861-E - 5.1 Default Encoding Parameters
                 *
                 * FIXME: This bit is only valid when using TMDS encoding and 8
                 * bit per color mode.
                 */
                if (pipe_config->has_hdmi_sink &&
                    drm_match_cea_mode(adjusted_mode) > 1)
                        pipe_config->limited_color_range = true;
        } else {
                if (pipe_config->has_hdmi_sink &&
                    intel_sdvo_state->base.broadcast_rgb == INTEL_BROADCAST_RGB_LIMITED)
                        pipe_config->limited_color_range = true;
        }

        /* Clock computation needs to happen after pixel multiplier. */
        if (intel_sdvo->is_tv)
                i9xx_adjust_sdvo_tv_clock(pipe_config);

        /* Set user selected PAR to incoming mode's member */
        if (intel_sdvo->is_hdmi)
                adjusted_mode->picture_aspect_ratio = conn_state->picture_aspect_ratio;

        return true;
}

#define UPDATE_PROPERTY(input, NAME) \
        do { \
                val = input; \
                intel_sdvo_set_value(intel_sdvo, SDVO_CMD_SET_##NAME, &val, sizeof(val)); \
        } while (0)

static void intel_sdvo_update_props(struct intel_sdvo *intel_sdvo,
                                    const struct intel_sdvo_connector_state *sdvo_state)
{
        const struct drm_connector_state *conn_state = &sdvo_state->base.base;
        struct intel_sdvo_connector *intel_sdvo_conn =
                to_intel_sdvo_connector(conn_state->connector);
        uint16_t val;

        if (intel_sdvo_conn->left)
                UPDATE_PROPERTY(sdvo_state->tv.overscan_h, OVERSCAN_H);

        if (intel_sdvo_conn->top)
                UPDATE_PROPERTY(sdvo_state->tv.overscan_v, OVERSCAN_V);

        if (intel_sdvo_conn->hpos)
                UPDATE_PROPERTY(sdvo_state->tv.hpos, HPOS);

        if (intel_sdvo_conn->vpos)
                UPDATE_PROPERTY(sdvo_state->tv.vpos, VPOS);

        if (intel_sdvo_conn->saturation)
                UPDATE_PROPERTY(conn_state->tv.saturation, SATURATION);

        if (intel_sdvo_conn->contrast)
                UPDATE_PROPERTY(conn_state->tv.contrast, CONTRAST);

        if (intel_sdvo_conn->hue)
                UPDATE_PROPERTY(conn_state->tv.hue, HUE);

        if (intel_sdvo_conn->brightness)
                UPDATE_PROPERTY(conn_state->tv.brightness, BRIGHTNESS);

        if (intel_sdvo_conn->sharpness)
                UPDATE_PROPERTY(sdvo_state->tv.sharpness, SHARPNESS);

        if (intel_sdvo_conn->flicker_filter)
                UPDATE_PROPERTY(sdvo_state->tv.flicker_filter, FLICKER_FILTER);

        if (intel_sdvo_conn->flicker_filter_2d)
                UPDATE_PROPERTY(sdvo_state->tv.flicker_filter_2d, FLICKER_FILTER_2D);

        if (intel_sdvo_conn->flicker_filter_adaptive)
                UPDATE_PROPERTY(sdvo_state->tv.flicker_filter_adaptive, FLICKER_FILTER_ADAPTIVE);

        if (intel_sdvo_conn->tv_chroma_filter)
                UPDATE_PROPERTY(sdvo_state->tv.chroma_filter, TV_CHROMA_FILTER);

        if (intel_sdvo_conn->tv_luma_filter)
                UPDATE_PROPERTY(sdvo_state->tv.luma_filter, TV_LUMA_FILTER);

        if (intel_sdvo_conn->dot_crawl)
                UPDATE_PROPERTY(sdvo_state->tv.dot_crawl, DOT_CRAWL);

#undef UPDATE_PROPERTY
}

static void intel_sdvo_pre_enable(struct intel_encoder *intel_encoder,
                                  const struct intel_crtc_state *crtc_state,
                                  const struct drm_connector_state *conn_state)
{
        struct drm_i915_private *dev_priv = to_i915(intel_encoder->base.dev);
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
        const struct drm_display_mode *adjusted_mode = &crtc_state->base.adjusted_mode;
        const struct intel_sdvo_connector_state *sdvo_state =
                to_intel_sdvo_connector_state(conn_state);
        const struct drm_display_mode *mode = &crtc_state->base.mode;
        struct intel_sdvo *intel_sdvo = to_sdvo(intel_encoder);
        u32 sdvox;
        struct intel_sdvo_in_out_map in_out;
        struct intel_sdvo_dtd input_dtd, output_dtd;
        int rate;

        intel_sdvo_update_props(intel_sdvo, sdvo_state);

        /*
         * First, set the input mapping for the first input to our controlled
         * output. This is only correct if we're a single-input device, in
         * which case the first input is the output from the appropriate SDVO
         * channel on the motherboard.  In a two-input device, the first input
         * will be SDVOB and the second SDVOC.
         */
        in_out.in0 = intel_sdvo->attached_output;
        in_out.in1 = 0;

        intel_sdvo_set_value(intel_sdvo,
                             SDVO_CMD_SET_IN_OUT_MAP,
                             &in_out, sizeof(in_out));

        /* Set the output timings to the screen */
        if (!intel_sdvo_set_target_output(intel_sdvo,
                                          intel_sdvo->attached_output))
                return;

        /* lvds has a special fixed output timing. */
        if (intel_sdvo->is_lvds)
                intel_sdvo_get_dtd_from_mode(&output_dtd,
                                             intel_sdvo->sdvo_lvds_fixed_mode);
        else
                intel_sdvo_get_dtd_from_mode(&output_dtd, mode);
        if (!intel_sdvo_set_output_timing(intel_sdvo, &output_dtd))
                DRM_INFO("Setting output timings on %s failed\n",
                         SDVO_NAME(intel_sdvo));

        /* Set the input timing to the screen. Assume always input 0. */
        if (!intel_sdvo_set_target_input(intel_sdvo))
                return;

        if (crtc_state->has_hdmi_sink) {
                intel_sdvo_set_encode(intel_sdvo, SDVO_ENCODE_HDMI);
                intel_sdvo_set_colorimetry(intel_sdvo,
                                           SDVO_COLORIMETRY_RGB256);
                intel_sdvo_set_avi_infoframe(intel_sdvo, crtc_state);
        } else
                intel_sdvo_set_encode(intel_sdvo, SDVO_ENCODE_DVI);

        if (intel_sdvo->is_tv &&
            !intel_sdvo_set_tv_format(intel_sdvo, conn_state))
                return;

        intel_sdvo_get_dtd_from_mode(&input_dtd, adjusted_mode);

        if (intel_sdvo->is_tv || intel_sdvo->is_lvds)
                input_dtd.part2.sdvo_flags = intel_sdvo->dtd_sdvo_flags;
        if (!intel_sdvo_set_input_timing(intel_sdvo, &input_dtd))
                DRM_INFO("Setting input timings on %s failed\n",
                         SDVO_NAME(intel_sdvo));

        switch (crtc_state->pixel_multiplier) {
        default:
                WARN(1, "unknown pixel multiplier specified\n");
        case 1: rate = SDVO_CLOCK_RATE_MULT_1X; break;
        case 2: rate = SDVO_CLOCK_RATE_MULT_2X; break;
        case 4: rate = SDVO_CLOCK_RATE_MULT_4X; break;
        }
        if (!intel_sdvo_set_clock_rate_mult(intel_sdvo, rate))
                return;

        /* Set the SDVO control regs. */
        if (INTEL_GEN(dev_priv) >= 4) {
                /* The real mode polarity is set by the SDVO commands, using
                 * struct intel_sdvo_dtd. */
                sdvox = SDVO_VSYNC_ACTIVE_HIGH | SDVO_HSYNC_ACTIVE_HIGH;
                if (!HAS_PCH_SPLIT(dev_priv) && crtc_state->limited_color_range)
                        sdvox |= HDMI_COLOR_RANGE_16_235;
                if (INTEL_GEN(dev_priv) < 5)
                        sdvox |= SDVO_BORDER_ENABLE;
        } else {
                sdvox = I915_READ(intel_sdvo->sdvo_reg);
                if (intel_sdvo->port == PORT_B)
                        sdvox &= SDVOB_PRESERVE_MASK;
                else
                        sdvox &= SDVOC_PRESERVE_MASK;
                sdvox |= (9 << 19) | SDVO_BORDER_ENABLE;
        }

        if (HAS_PCH_CPT(dev_priv))
                sdvox |= SDVO_PIPE_SEL_CPT(crtc->pipe);
        else
                sdvox |= SDVO_PIPE_SEL(crtc->pipe);

        if (crtc_state->has_audio) {
                WARN_ON_ONCE(INTEL_GEN(dev_priv) < 4);
                sdvox |= SDVO_AUDIO_ENABLE;
        }

        if (INTEL_GEN(dev_priv) >= 4) {
                /* done in crtc_mode_set as the dpll_md reg must be written early */
        } else if (IS_I945G(dev_priv) || IS_I945GM(dev_priv) ||
                   IS_G33(dev_priv) || IS_PINEVIEW(dev_priv)) {
                /* done in crtc_mode_set as it lives inside the dpll register */
        } else {
                sdvox |= (crtc_state->pixel_multiplier - 1)
                        << SDVO_PORT_MULTIPLY_SHIFT;
        }

        if (input_dtd.part2.sdvo_flags & SDVO_NEED_TO_STALL &&
            INTEL_GEN(dev_priv) < 5)
                sdvox |= SDVO_STALL_SELECT;
        intel_sdvo_write_sdvox(intel_sdvo, sdvox);
}

static bool intel_sdvo_connector_get_hw_state(struct intel_connector *connector)
{
        struct intel_sdvo_connector *intel_sdvo_connector =
                to_intel_sdvo_connector(&connector->base);
        struct intel_sdvo *intel_sdvo = intel_attached_sdvo(&connector->base);
        u16 active_outputs = 0;

        intel_sdvo_get_active_outputs(intel_sdvo, &active_outputs);

        if (active_outputs & intel_sdvo_connector->output_flag)
                return true;
        else
                return false;
}

static bool intel_sdvo_get_hw_state(struct intel_encoder *encoder,
                                    enum pipe *pipe)
{
        struct drm_device *dev = encoder->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_sdvo *intel_sdvo = to_sdvo(encoder);
        u16 active_outputs = 0;
        u32 tmp;

        tmp = I915_READ(intel_sdvo->sdvo_reg);
        intel_sdvo_get_active_outputs(intel_sdvo, &active_outputs);

        if (!(tmp & SDVO_ENABLE) && (active_outputs == 0))
                return false;

        if (HAS_PCH_CPT(dev_priv))
                *pipe = PORT_TO_PIPE_CPT(tmp);
        else
                *pipe = PORT_TO_PIPE(tmp);

        return true;
}

static void intel_sdvo_get_config(struct intel_encoder *encoder,
                                  struct intel_crtc_state *pipe_config)
{
        struct drm_device *dev = encoder->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_sdvo *intel_sdvo = to_sdvo(encoder);
        struct intel_sdvo_dtd dtd;
        int encoder_pixel_multiplier = 0;
        int dotclock;
        u32 flags = 0, sdvox;
        u8 val;
        bool ret;

        pipe_config->output_types |= BIT(INTEL_OUTPUT_SDVO);

        sdvox = I915_READ(intel_sdvo->sdvo_reg);

        ret = intel_sdvo_get_input_timing(intel_sdvo, &dtd);
        if (!ret) {
                /*
                 * Some sdvo encoders are not spec compliant and don't
                 * implement the mandatory get_timings function.
                 */
                DRM_DEBUG_DRIVER("failed to retrieve SDVO DTD\n");
                pipe_config->quirks |= PIPE_CONFIG_QUIRK_MODE_SYNC_FLAGS;
        } else {
                if (dtd.part2.dtd_flags & DTD_FLAG_HSYNC_POSITIVE)
                        flags |= DRM_MODE_FLAG_PHSYNC;
                else
                        flags |= DRM_MODE_FLAG_NHSYNC;

                if (dtd.part2.dtd_flags & DTD_FLAG_VSYNC_POSITIVE)
                        flags |= DRM_MODE_FLAG_PVSYNC;
                else
                        flags |= DRM_MODE_FLAG_NVSYNC;
        }

        pipe_config->base.adjusted_mode.flags |= flags;

        /*
         * pixel multiplier readout is tricky: Only on i915g/gm it is stored in
         * the sdvo port register, on all other platforms it is part of the dpll
         * state. Since the general pipe state readout happens before the
         * encoder->get_config we so already have a valid pixel multplier on all
         * other platfroms.
         */
        if (IS_I915G(dev_priv) || IS_I915GM(dev_priv)) {
                pipe_config->pixel_multiplier =
                        ((sdvox & SDVO_PORT_MULTIPLY_MASK)
                         >> SDVO_PORT_MULTIPLY_SHIFT) + 1;
        }

        dotclock = pipe_config->port_clock;

        if (pipe_config->pixel_multiplier)
                dotclock /= pipe_config->pixel_multiplier;

        pipe_config->base.adjusted_mode.crtc_clock = dotclock;

        /* Cross check the port pixel multiplier with the sdvo encoder state. */
        if (intel_sdvo_get_value(intel_sdvo, SDVO_CMD_GET_CLOCK_RATE_MULT,
                                 &val, 1)) {
                switch (val) {
                case SDVO_CLOCK_RATE_MULT_1X:
                        encoder_pixel_multiplier = 1;
                        break;
                case SDVO_CLOCK_RATE_MULT_2X:
                        encoder_pixel_multiplier = 2;
                        break;
                case SDVO_CLOCK_RATE_MULT_4X:
                        encoder_pixel_multiplier = 4;
                        break;
                }
        }

        if (sdvox & HDMI_COLOR_RANGE_16_235)
                pipe_config->limited_color_range = true;

        if (sdvox & SDVO_AUDIO_ENABLE)
                pipe_config->has_audio = true;

        if (intel_sdvo_get_value(intel_sdvo, SDVO_CMD_GET_ENCODE,
                                 &val, 1)) {
                if (val == SDVO_ENCODE_HDMI)
                        pipe_config->has_hdmi_sink = true;
        }

        WARN(encoder_pixel_multiplier != pipe_config->pixel_multiplier,
             "SDVO pixel multiplier mismatch, port: %i, encoder: %i\n",
             pipe_config->pixel_multiplier, encoder_pixel_multiplier);
}

static void intel_disable_sdvo(struct intel_encoder *encoder,
                               const struct intel_crtc_state *old_crtc_state,
                               const struct drm_connector_state *conn_state)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_sdvo *intel_sdvo = to_sdvo(encoder);
        struct intel_crtc *crtc = to_intel_crtc(old_crtc_state->base.crtc);
        u32 temp;

        intel_sdvo_set_active_outputs(intel_sdvo, 0);
        if (0)
                intel_sdvo_set_encoder_power_state(intel_sdvo,
                                                   DRM_MODE_DPMS_OFF);

        temp = I915_READ(intel_sdvo->sdvo_reg);

        temp &= ~SDVO_ENABLE;
        intel_sdvo_write_sdvox(intel_sdvo, temp);

        /*
         * HW workaround for IBX, we need to move the port
         * to transcoder A after disabling it to allow the
         * matching DP port to be enabled on transcoder A.
         */
        if (HAS_PCH_IBX(dev_priv) && crtc->pipe == PIPE_B) {
                /*
                 * We get CPU/PCH FIFO underruns on the other pipe when
                 * doing the workaround. Sweep them under the rug.
                 */
                intel_set_cpu_fifo_underrun_reporting(dev_priv, PIPE_A, false);
                intel_set_pch_fifo_underrun_reporting(dev_priv, PIPE_A, false);

                temp &= ~SDVO_PIPE_B_SELECT;
                temp |= SDVO_ENABLE;
                intel_sdvo_write_sdvox(intel_sdvo, temp);

                temp &= ~SDVO_ENABLE;
                intel_sdvo_write_sdvox(intel_sdvo, temp);

                intel_wait_for_vblank_if_active(dev_priv, PIPE_A);
                intel_set_cpu_fifo_underrun_reporting(dev_priv, PIPE_A, true);
                intel_set_pch_fifo_underrun_reporting(dev_priv, PIPE_A, true);
        }
}

static void pch_disable_sdvo(struct intel_encoder *encoder,
                             const struct intel_crtc_state *old_crtc_state,
                             const struct drm_connector_state *old_conn_state)
{
}

static void pch_post_disable_sdvo(struct intel_encoder *encoder,
                                  const struct intel_crtc_state *old_crtc_state,
                                  const struct drm_connector_state *old_conn_state)
{
        intel_disable_sdvo(encoder, old_crtc_state, old_conn_state);
}

static void intel_enable_sdvo(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);
        struct intel_sdvo *intel_sdvo = to_sdvo(encoder);
        struct intel_crtc *intel_crtc = to_intel_crtc(pipe_config->base.crtc);
        u32 temp;
        bool input1, input2;
        int i;
        bool success;

        temp = I915_READ(intel_sdvo->sdvo_reg);
        temp |= SDVO_ENABLE;
        intel_sdvo_write_sdvox(intel_sdvo, temp);

        for (i = 0; i < 2; i++)
                intel_wait_for_vblank(dev_priv, intel_crtc->pipe);

        success = intel_sdvo_get_trained_inputs(intel_sdvo, &input1, &input2);
        /*
         * Warn if the device reported failure to sync.
         *
         * A lot of SDVO devices fail to notify of sync, but it's
         * a given it the status is a success, we succeeded.
         */
        if (success && !input1) {
                DRM_DEBUG_KMS("First %s output reported failure to "
                                "sync\n", SDVO_NAME(intel_sdvo));
        }

        if (0)
                intel_sdvo_set_encoder_power_state(intel_sdvo,
                                                   DRM_MODE_DPMS_ON);
        intel_sdvo_set_active_outputs(intel_sdvo, intel_sdvo->attached_output);
}

static enum drm_mode_status
intel_sdvo_mode_valid(struct drm_connector *connector,
                      struct drm_display_mode *mode)
{
        struct intel_sdvo *intel_sdvo = intel_attached_sdvo(connector);
        int max_dotclk = to_i915(connector->dev)->max_dotclk_freq;

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

        if (intel_sdvo->pixel_clock_min > mode->clock)
                return MODE_CLOCK_LOW;

        if (intel_sdvo->pixel_clock_max < mode->clock)
                return MODE_CLOCK_HIGH;

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

        if (intel_sdvo->is_lvds) {
                if (mode->hdisplay > intel_sdvo->sdvo_lvds_fixed_mode->hdisplay)
                        return MODE_PANEL;

                if (mode->vdisplay > intel_sdvo->sdvo_lvds_fixed_mode->vdisplay)
                        return MODE_PANEL;
        }

        return MODE_OK;
}

static bool intel_sdvo_get_capabilities(struct intel_sdvo *intel_sdvo, struct intel_sdvo_caps *caps)
{
        BUILD_BUG_ON(sizeof(*caps) != 8);
        if (!intel_sdvo_get_value(intel_sdvo,
                                  SDVO_CMD_GET_DEVICE_CAPS,
                                  caps, sizeof(*caps)))
                return false;

        DRM_DEBUG_KMS("SDVO capabilities:\n"
                      "  vendor_id: %d\n"
                      "  device_id: %d\n"
                      "  device_rev_id: %d\n"
                      "  sdvo_version_major: %d\n"
                      "  sdvo_version_minor: %d\n"
                      "  sdvo_inputs_mask: %d\n"
                      "  smooth_scaling: %d\n"
                      "  sharp_scaling: %d\n"
                      "  up_scaling: %d\n"
                      "  down_scaling: %d\n"
                      "  stall_support: %d\n"
                      "  output_flags: %d\n",
                      caps->vendor_id,
                      caps->device_id,
                      caps->device_rev_id,
                      caps->sdvo_version_major,
                      caps->sdvo_version_minor,
                      caps->sdvo_inputs_mask,
                      caps->smooth_scaling,
                      caps->sharp_scaling,
                      caps->up_scaling,
                      caps->down_scaling,
                      caps->stall_support,
                      caps->output_flags);

        return true;
}

static uint16_t intel_sdvo_get_hotplug_support(struct intel_sdvo *intel_sdvo)
{
        struct drm_i915_private *dev_priv = to_i915(intel_sdvo->base.base.dev);
        uint16_t hotplug;

        if (!I915_HAS_HOTPLUG(dev_priv))
                return 0;

        /*
         * HW Erratum: SDVO Hotplug is broken on all i945G chips, there's noise
         * on the line.
         */
        if (IS_I945G(dev_priv) || IS_I945GM(dev_priv))
                return 0;

        if (!intel_sdvo_get_value(intel_sdvo, SDVO_CMD_GET_HOT_PLUG_SUPPORT,
                                        &hotplug, sizeof(hotplug)))
                return 0;

        return hotplug;
}

static void intel_sdvo_enable_hotplug(struct intel_encoder *encoder)
{
        struct intel_sdvo *intel_sdvo = to_sdvo(encoder);

        intel_sdvo_write_cmd(intel_sdvo, SDVO_CMD_SET_ACTIVE_HOT_PLUG,
                             &intel_sdvo->hotplug_active, 2);
}

static bool intel_sdvo_hotplug(struct intel_encoder *encoder,
                               struct intel_connector *connector)
{
        intel_sdvo_enable_hotplug(encoder);

        return intel_encoder_hotplug(encoder, connector);
}

static bool
intel_sdvo_multifunc_encoder(struct intel_sdvo *intel_sdvo)
{
        /* Is there more than one type of output? */
        return hweight16(intel_sdvo->caps.output_flags) > 1;
}

static struct edid *
intel_sdvo_get_edid(struct drm_connector *connector)
{
        struct intel_sdvo *sdvo = intel_attached_sdvo(connector);
        return drm_get_edid(connector, &sdvo->ddc);
}

/* Mac mini hack -- use the same DDC as the analog connector */
static struct edid *
intel_sdvo_get_analog_edid(struct drm_connector *connector)
{
        struct drm_i915_private *dev_priv = to_i915(connector->dev);

        return drm_get_edid(connector,
                            intel_gmbus_get_adapter(dev_priv,
                                                    dev_priv->vbt.crt_ddc_pin));
}

static enum drm_connector_status
intel_sdvo_tmds_sink_detect(struct drm_connector *connector)
{
        struct intel_sdvo *intel_sdvo = intel_attached_sdvo(connector);
        enum drm_connector_status status;
        struct edid *edid;

        edid = intel_sdvo_get_edid(connector);

        if (edid == NULL && intel_sdvo_multifunc_encoder(intel_sdvo)) {
                u8 ddc, saved_ddc = intel_sdvo->ddc_bus;

                /*
                 * Don't use the 1 as the argument of DDC bus switch to get
                 * the EDID. It is used for SDVO SPD ROM.
                 */
                for (ddc = intel_sdvo->ddc_bus >> 1; ddc > 1; ddc >>= 1) {
                        intel_sdvo->ddc_bus = ddc;
                        edid = intel_sdvo_get_edid(connector);
                        if (edid)
                                break;
                }
                /*
                 * If we found the EDID on the other bus,
                 * assume that is the correct DDC bus.
                 */
                if (edid == NULL)
                        intel_sdvo->ddc_bus = saved_ddc;
        }

        /*
         * When there is no edid and no monitor is connected with VGA
         * port, try to use the CRT ddc to read the EDID for DVI-connector.
         */
        if (edid == NULL)
                edid = intel_sdvo_get_analog_edid(connector);

        status = connector_status_unknown;
        if (edid != NULL) {
                /* DDC bus is shared, match EDID to connector type */
                if (edid->input & DRM_EDID_INPUT_DIGITAL) {
                        status = connector_status_connected;
                        if (intel_sdvo->is_hdmi) {
                                intel_sdvo->has_hdmi_monitor = drm_detect_hdmi_monitor(edid);
                                intel_sdvo->has_hdmi_audio = drm_detect_monitor_audio(edid);
                                intel_sdvo->rgb_quant_range_selectable =
                                        drm_rgb_quant_range_selectable(edid);
                        }
                } else
                        status = connector_status_disconnected;
                kfree(edid);
        }

        return status;
}

static bool
intel_sdvo_connector_matches_edid(struct intel_sdvo_connector *sdvo,
                                  struct edid *edid)
{
        bool monitor_is_digital = !!(edid->input & DRM_EDID_INPUT_DIGITAL);
        bool connector_is_digital = !!IS_DIGITAL(sdvo);

        DRM_DEBUG_KMS("connector_is_digital? %d, monitor_is_digital? %d\n",
                      connector_is_digital, monitor_is_digital);
        return connector_is_digital == monitor_is_digital;
}

static enum drm_connector_status
intel_sdvo_detect(struct drm_connector *connector, bool force)
{
        uint16_t response;
        struct intel_sdvo *intel_sdvo = intel_attached_sdvo(connector);
        struct intel_sdvo_connector *intel_sdvo_connector = to_intel_sdvo_connector(connector);
        enum drm_connector_status ret;

        DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
                      connector->base.id, connector->name);

        if (!intel_sdvo_get_value(intel_sdvo,
                                  SDVO_CMD_GET_ATTACHED_DISPLAYS,
                                  &response, 2))
                return connector_status_unknown;

        DRM_DEBUG_KMS("SDVO response %d %d [%x]\n",
                      response & 0xff, response >> 8,
                      intel_sdvo_connector->output_flag);

        if (response == 0)
                return connector_status_disconnected;

        intel_sdvo->attached_output = response;

        intel_sdvo->has_hdmi_monitor = false;
        intel_sdvo->has_hdmi_audio = false;
        intel_sdvo->rgb_quant_range_selectable = false;

        if ((intel_sdvo_connector->output_flag & response) == 0)
                ret = connector_status_disconnected;
        else if (IS_TMDS(intel_sdvo_connector))
                ret = intel_sdvo_tmds_sink_detect(connector);
        else {
                struct edid *edid;

                /* if we have an edid check it matches the connection */
                edid = intel_sdvo_get_edid(connector);
                if (edid == NULL)
                        edid = intel_sdvo_get_analog_edid(connector);
                if (edid != NULL) {
                        if (intel_sdvo_connector_matches_edid(intel_sdvo_connector,
                                                              edid))
                                ret = connector_status_connected;
                        else
                                ret = connector_status_disconnected;

                        kfree(edid);
                } else
                        ret = connector_status_connected;
        }

        /* May update encoder flag for like clock for SDVO TV, etc.*/
        if (ret == connector_status_connected) {
                intel_sdvo->is_tv = false;
                intel_sdvo->is_lvds = false;

                if (response & SDVO_TV_MASK)
                        intel_sdvo->is_tv = true;
                if (response & SDVO_LVDS_MASK)
                        intel_sdvo->is_lvds = intel_sdvo->sdvo_lvds_fixed_mode != NULL;
        }

        return ret;
}

static void intel_sdvo_get_ddc_modes(struct drm_connector *connector)
{
        struct edid *edid;

        DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
                      connector->base.id, connector->name);

        /* set the bus switch and get the modes */
        edid = intel_sdvo_get_edid(connector);

        /*
         * Mac mini hack.  On this device, the DVI-I connector shares one DDC
         * link between analog and digital outputs. So, if the regular SDVO
         * DDC fails, check to see if the analog output is disconnected, in
         * which case we'll look there for the digital DDC data.
         */
        if (edid == NULL)
                edid = intel_sdvo_get_analog_edid(connector);

        if (edid != NULL) {
                if (intel_sdvo_connector_matches_edid(to_intel_sdvo_connector(connector),
                                                      edid)) {
                        drm_mode_connector_update_edid_property(connector, edid);
                        drm_add_edid_modes(connector, edid);
                }

                kfree(edid);
        }
}

/*
 * Set of SDVO TV modes.
 * Note!  This is in reply order (see loop in get_tv_modes).
 * XXX: all 60Hz refresh?
 */
static const struct drm_display_mode sdvo_tv_modes[] = {
        { DRM_MODE("320x200", DRM_MODE_TYPE_DRIVER, 5815, 320, 321, 384,
                   416, 0, 200, 201, 232, 233, 0,
                   DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
        { DRM_MODE("320x240", DRM_MODE_TYPE_DRIVER, 6814, 320, 321, 384,
                   416, 0, 240, 241, 272, 273, 0,
                   DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
        { DRM_MODE("400x300", DRM_MODE_TYPE_DRIVER, 9910, 400, 401, 464,
                   496, 0, 300, 301, 332, 333, 0,
                   DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
        { DRM_MODE("640x350", DRM_MODE_TYPE_DRIVER, 16913, 640, 641, 704,
                   736, 0, 350, 351, 382, 383, 0,
                   DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
        { DRM_MODE("640x400", DRM_MODE_TYPE_DRIVER, 19121, 640, 641, 704,
                   736, 0, 400, 401, 432, 433, 0,
                   DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
        { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 22654, 640, 641, 704,
                   736, 0, 480, 481, 512, 513, 0,
                   DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
        { DRM_MODE("704x480", DRM_MODE_TYPE_DRIVER, 24624, 704, 705, 768,
                   800, 0, 480, 481, 512, 513, 0,
                   DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
        { DRM_MODE("704x576", DRM_MODE_TYPE_DRIVER, 29232, 704, 705, 768,
                   800, 0, 576, 577, 608, 609, 0,
                   DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
        { DRM_MODE("720x350", DRM_MODE_TYPE_DRIVER, 18751, 720, 721, 784,
                   816, 0, 350, 351, 382, 383, 0,
                   DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
        { DRM_MODE("720x400", DRM_MODE_TYPE_DRIVER, 21199, 720, 721, 784,
                   816, 0, 400, 401, 432, 433, 0,
                   DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
        { DRM_MODE("720x480", DRM_MODE_TYPE_DRIVER, 25116, 720, 721, 784,
                   816, 0, 480, 481, 512, 513, 0,
                   DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
        { DRM_MODE("720x540", DRM_MODE_TYPE_DRIVER, 28054, 720, 721, 784,
                   816, 0, 540, 541, 572, 573, 0,
                   DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
        { DRM_MODE("720x576", DRM_MODE_TYPE_DRIVER, 29816, 720, 721, 784,
                   816, 0, 576, 577, 608, 609, 0,
                   DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
        { DRM_MODE("768x576", DRM_MODE_TYPE_DRIVER, 31570, 768, 769, 832,
                   864, 0, 576, 577, 608, 609, 0,
                   DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
        { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 34030, 800, 801, 864,
                   896, 0, 600, 601, 632, 633, 0,
                   DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
        { DRM_MODE("832x624", DRM_MODE_TYPE_DRIVER, 36581, 832, 833, 896,
                   928, 0, 624, 625, 656, 657, 0,
                   DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
        { DRM_MODE("920x766", DRM_MODE_TYPE_DRIVER, 48707, 920, 921, 984,
                   1016, 0, 766, 767, 798, 799, 0,
                   DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
        { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 53827, 1024, 1025, 1088,
                   1120, 0, 768, 769, 800, 801, 0,
                   DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
        { DRM_MODE("1280x1024", DRM_MODE_TYPE_DRIVER, 87265, 1280, 1281, 1344,
                   1376, 0, 1024, 1025, 1056, 1057, 0,
                   DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
};

static void intel_sdvo_get_tv_modes(struct drm_connector *connector)
{
        struct intel_sdvo *intel_sdvo = intel_attached_sdvo(connector);
        const struct drm_connector_state *conn_state = connector->state;
        struct intel_sdvo_sdtv_resolution_request tv_res;
        uint32_t reply = 0, format_map = 0;
        int i;

        DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
                      connector->base.id, connector->name);

        /*
         * Read the list of supported input resolutions for the selected TV
         * format.
         */
        format_map = 1 << conn_state->tv.mode;
        memcpy(&tv_res, &format_map,
               min(sizeof(format_map), sizeof(struct intel_sdvo_sdtv_resolution_request)));

        if (!intel_sdvo_set_target_output(intel_sdvo, intel_sdvo->attached_output))
                return;

        BUILD_BUG_ON(sizeof(tv_res) != 3);
        if (!intel_sdvo_write_cmd(intel_sdvo,
                                  SDVO_CMD_GET_SDTV_RESOLUTION_SUPPORT,
                                  &tv_res, sizeof(tv_res)))
                return;
        if (!intel_sdvo_read_response(intel_sdvo, &reply, 3))
                return;

        for (i = 0; i < ARRAY_SIZE(sdvo_tv_modes); i++)
                if (reply & (1 << i)) {

                        struct drm_display_mode *nmode;
                        nmode = drm_mode_duplicate(connector->dev,
                                                   &sdvo_tv_modes[i]);
                        if (nmode)
                                drm_mode_probed_add(connector, nmode);
                }
}

static void intel_sdvo_get_lvds_modes(struct drm_connector *connector)
{
        struct intel_sdvo *intel_sdvo = intel_attached_sdvo(connector);
        struct drm_i915_private *dev_priv = to_i915(connector->dev);
        struct drm_display_mode *newmode;

        DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
                      connector->base.id, connector->name);

        /*
         * Fetch modes from VBT. For SDVO prefer the VBT mode since some
         * SDVO->LVDS transcoders can't cope with the EDID mode.
         */
        if (dev_priv->vbt.sdvo_lvds_vbt_mode != NULL) {
                newmode = drm_mode_duplicate(connector->dev,
                                             dev_priv->vbt.sdvo_lvds_vbt_mode);
                if (newmode != NULL) {
                        /* Guarantee the mode is preferred */
                        newmode->type = (DRM_MODE_TYPE_PREFERRED |
                                         DRM_MODE_TYPE_DRIVER);
                        drm_mode_probed_add(connector, newmode);
                }
        }

        /*
         * Attempt to get the mode list from DDC.
         * Assume that the preferred modes are
         * arranged in priority order.
         */
        intel_ddc_get_modes(connector, &intel_sdvo->ddc);

        list_for_each_entry(newmode, &connector->probed_modes, head) {
                if (newmode->type & DRM_MODE_TYPE_PREFERRED) {
                        intel_sdvo->sdvo_lvds_fixed_mode =
                                drm_mode_duplicate(connector->dev, newmode);

                        intel_sdvo->is_lvds = true;
                        break;
                }
        }
}

static int intel_sdvo_get_modes(struct drm_connector *connector)
{
        struct intel_sdvo_connector *intel_sdvo_connector = to_intel_sdvo_connector(connector);

        if (IS_TV(intel_sdvo_connector))
                intel_sdvo_get_tv_modes(connector);
        else if (IS_LVDS(intel_sdvo_connector))
                intel_sdvo_get_lvds_modes(connector);
        else
                intel_sdvo_get_ddc_modes(connector);

        return !list_empty(&connector->probed_modes);
}

static void intel_sdvo_destroy(struct drm_connector *connector)
{
        struct intel_sdvo_connector *intel_sdvo_connector = to_intel_sdvo_connector(connector);

        drm_connector_cleanup(connector);
        kfree(intel_sdvo_connector);
}

static int
intel_sdvo_connector_atomic_get_property(struct drm_connector *connector,
                                         const struct drm_connector_state *state,
                                         struct drm_property *property,
                                         uint64_t *val)
{
        struct intel_sdvo_connector *intel_sdvo_connector = to_intel_sdvo_connector(connector);
        const struct intel_sdvo_connector_state *sdvo_state = to_intel_sdvo_connector_state((void *)state);

        if (property == intel_sdvo_connector->tv_format) {
                int i;

                for (i = 0; i < intel_sdvo_connector->format_supported_num; i++)
                        if (state->tv.mode == intel_sdvo_connector->tv_format_supported[i]) {
                                *val = i;

                                return 0;
                        }

                WARN_ON(1);
                *val = 0;
        } else if (property == intel_sdvo_connector->top ||
                   property == intel_sdvo_connector->bottom)
                *val = intel_sdvo_connector->max_vscan - sdvo_state->tv.overscan_v;
        else if (property == intel_sdvo_connector->left ||
                 property == intel_sdvo_connector->right)
                *val = intel_sdvo_connector->max_hscan - sdvo_state->tv.overscan_h;
        else if (property == intel_sdvo_connector->hpos)
                *val = sdvo_state->tv.hpos;
        else if (property == intel_sdvo_connector->vpos)
                *val = sdvo_state->tv.vpos;
        else if (property == intel_sdvo_connector->saturation)
                *val = state->tv.saturation;
        else if (property == intel_sdvo_connector->contrast)
                *val = state->tv.contrast;
        else if (property == intel_sdvo_connector->hue)
                *val = state->tv.hue;
        else if (property == intel_sdvo_connector->brightness)
                *val = state->tv.brightness;
        else if (property == intel_sdvo_connector->sharpness)
                *val = sdvo_state->tv.sharpness;
        else if (property == intel_sdvo_connector->flicker_filter)
                *val = sdvo_state->tv.flicker_filter;
        else if (property == intel_sdvo_connector->flicker_filter_2d)
                *val = sdvo_state->tv.flicker_filter_2d;
        else if (property == intel_sdvo_connector->flicker_filter_adaptive)
                *val = sdvo_state->tv.flicker_filter_adaptive;
        else if (property == intel_sdvo_connector->tv_chroma_filter)
                *val = sdvo_state->tv.chroma_filter;
        else if (property == intel_sdvo_connector->tv_luma_filter)
                *val = sdvo_state->tv.luma_filter;
        else if (property == intel_sdvo_connector->dot_crawl)
                *val = sdvo_state->tv.dot_crawl;
        else
                return intel_digital_connector_atomic_get_property(connector, state, property, val);

        return 0;
}

static int
intel_sdvo_connector_atomic_set_property(struct drm_connector *connector,
                                         struct drm_connector_state *state,
                                         struct drm_property *property,
                                         uint64_t val)
{
        struct intel_sdvo_connector *intel_sdvo_connector = to_intel_sdvo_connector(connector);
        struct intel_sdvo_connector_state *sdvo_state = to_intel_sdvo_connector_state(state);

        if (property == intel_sdvo_connector->tv_format) {
                state->tv.mode = intel_sdvo_connector->tv_format_supported[val];

                if (state->crtc) {
                        struct drm_crtc_state *crtc_state =
                                drm_atomic_get_new_crtc_state(state->state, state->crtc);

                        crtc_state->connectors_changed = true;
                }
        } else if (property == intel_sdvo_connector->top ||
                   property == intel_sdvo_connector->bottom)
                /* Cannot set these independent from each other */
                sdvo_state->tv.overscan_v = intel_sdvo_connector->max_vscan - val;
        else if (property == intel_sdvo_connector->left ||
                 property == intel_sdvo_connector->right)
                /* Cannot set these independent from each other */
                sdvo_state->tv.overscan_h = intel_sdvo_connector->max_hscan - val;
        else if (property == intel_sdvo_connector->hpos)
                sdvo_state->tv.hpos = val;
        else if (property == intel_sdvo_connector->vpos)
                sdvo_state->tv.vpos = val;
        else if (property == intel_sdvo_connector->saturation)
                state->tv.saturation = val;
        else if (property == intel_sdvo_connector->contrast)
                state->tv.contrast = val;
        else if (property == intel_sdvo_connector->hue)
                state->tv.hue = val;
        else if (property == intel_sdvo_connector->brightness)
                state->tv.brightness = val;
        else if (property == intel_sdvo_connector->sharpness)
                sdvo_state->tv.sharpness = val;
        else if (property == intel_sdvo_connector->flicker_filter)
                sdvo_state->tv.flicker_filter = val;
        else if (property == intel_sdvo_connector->flicker_filter_2d)
                sdvo_state->tv.flicker_filter_2d = val;
        else if (property == intel_sdvo_connector->flicker_filter_adaptive)
                sdvo_state->tv.flicker_filter_adaptive = val;
        else if (property == intel_sdvo_connector->tv_chroma_filter)
                sdvo_state->tv.chroma_filter = val;
        else if (property == intel_sdvo_connector->tv_luma_filter)
                sdvo_state->tv.luma_filter = val;
        else if (property == intel_sdvo_connector->dot_crawl)
                sdvo_state->tv.dot_crawl = val;
        else
                return intel_digital_connector_atomic_set_property(connector, state, property, val);

        return 0;
}

static int
intel_sdvo_connector_register(struct drm_connector *connector)
{
        struct intel_sdvo *sdvo = intel_attached_sdvo(connector);
        int ret;

        ret = intel_connector_register(connector);
        if (ret)
                return ret;

        return sysfs_create_link(&connector->kdev->kobj,
                                 &sdvo->ddc.dev.kobj,
                                 sdvo->ddc.dev.kobj.name);
}

static void
intel_sdvo_connector_unregister(struct drm_connector *connector)
{
        struct intel_sdvo *sdvo = intel_attached_sdvo(connector);

        sysfs_remove_link(&connector->kdev->kobj,
                          sdvo->ddc.dev.kobj.name);
        intel_connector_unregister(connector);
}

static struct drm_connector_state *
intel_sdvo_connector_duplicate_state(struct drm_connector *connector)
{
        struct intel_sdvo_connector_state *state;

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

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

static const struct drm_connector_funcs intel_sdvo_connector_funcs = {
        .detect = intel_sdvo_detect,
        .fill_modes = drm_helper_probe_single_connector_modes,
        .atomic_get_property = intel_sdvo_connector_atomic_get_property,
        .atomic_set_property = intel_sdvo_connector_atomic_set_property,
        .late_register = intel_sdvo_connector_register,
        .early_unregister = intel_sdvo_connector_unregister,
        .destroy = intel_sdvo_destroy,
        .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
        .atomic_duplicate_state = intel_sdvo_connector_duplicate_state,
};

static int intel_sdvo_atomic_check(struct drm_connector *conn,
                                   struct drm_connector_state *new_conn_state)
{
        struct drm_atomic_state *state = new_conn_state->state;
        struct drm_connector_state *old_conn_state =
                drm_atomic_get_old_connector_state(state, conn);
        struct intel_sdvo_connector_state *old_state =
                to_intel_sdvo_connector_state(old_conn_state);
        struct intel_sdvo_connector_state *new_state =
                to_intel_sdvo_connector_state(new_conn_state);

        if (new_conn_state->crtc &&
            (memcmp(&old_state->tv, &new_state->tv, sizeof(old_state->tv)) ||
             memcmp(&old_conn_state->tv, &new_conn_state->tv, sizeof(old_conn_state->tv)))) {
                struct drm_crtc_state *crtc_state =
                        drm_atomic_get_new_crtc_state(new_conn_state->state,
                                                      new_conn_state->crtc);

                crtc_state->connectors_changed = true;
        }

        return intel_digital_connector_atomic_check(conn, new_conn_state);
}

static const struct drm_connector_helper_funcs intel_sdvo_connector_helper_funcs = {
        .get_modes = intel_sdvo_get_modes,
        .mode_valid = intel_sdvo_mode_valid,
        .atomic_check = intel_sdvo_atomic_check,
};

static void intel_sdvo_enc_destroy(struct drm_encoder *encoder)
{
        struct intel_sdvo *intel_sdvo = to_sdvo(to_intel_encoder(encoder));

        if (intel_sdvo->sdvo_lvds_fixed_mode != NULL)
                drm_mode_destroy(encoder->dev,
                                 intel_sdvo->sdvo_lvds_fixed_mode);

        i2c_del_adapter(&intel_sdvo->ddc);
        intel_encoder_destroy(encoder);
}

static const struct drm_encoder_funcs intel_sdvo_enc_funcs = {
        .destroy = intel_sdvo_enc_destroy,
};

static void
intel_sdvo_guess_ddc_bus(struct intel_sdvo *sdvo)
{
        uint16_t mask = 0;
        unsigned int num_bits;

        /*
         * Make a mask of outputs less than or equal to our own priority in the
         * list.
         */
        switch (sdvo->controlled_output) {
        case SDVO_OUTPUT_LVDS1:
                mask |= SDVO_OUTPUT_LVDS1;
        case SDVO_OUTPUT_LVDS0:
                mask |= SDVO_OUTPUT_LVDS0;
        case SDVO_OUTPUT_TMDS1:
                mask |= SDVO_OUTPUT_TMDS1;
        case SDVO_OUTPUT_TMDS0:
                mask |= SDVO_OUTPUT_TMDS0;
        case SDVO_OUTPUT_RGB1:
                mask |= SDVO_OUTPUT_RGB1;
        case SDVO_OUTPUT_RGB0:
                mask |= SDVO_OUTPUT_RGB0;
                break;
        }

        /* Count bits to find what number we are in the priority list. */
        mask &= sdvo->caps.output_flags;
        num_bits = hweight16(mask);
        /* If more than 3 outputs, default to DDC bus 3 for now. */
        if (num_bits > 3)
                num_bits = 3;

        /* Corresponds to SDVO_CONTROL_BUS_DDCx */
        sdvo->ddc_bus = 1 << num_bits;
}

/*
 * Choose the appropriate DDC bus for control bus switch command for this
 * SDVO output based on the controlled output.
 *
 * DDC bus number assignment is in a priority order of RGB outputs, then TMDS
 * outputs, then LVDS outputs.
 */
static void
intel_sdvo_select_ddc_bus(struct drm_i915_private *dev_priv,
                          struct intel_sdvo *sdvo)
{
        struct sdvo_device_mapping *mapping;

        if (sdvo->port == PORT_B)
                mapping = &dev_priv->vbt.sdvo_mappings[0];
        else
                mapping = &dev_priv->vbt.sdvo_mappings[1];

        if (mapping->initialized)
                sdvo->ddc_bus = 1 << ((mapping->ddc_pin & 0xf0) >> 4);
        else
                intel_sdvo_guess_ddc_bus(sdvo);
}

static void
intel_sdvo_select_i2c_bus(struct drm_i915_private *dev_priv,
                          struct intel_sdvo *sdvo)
{
        struct sdvo_device_mapping *mapping;
        u8 pin;

        if (sdvo->port == PORT_B)
                mapping = &dev_priv->vbt.sdvo_mappings[0];
        else
                mapping = &dev_priv->vbt.sdvo_mappings[1];

        if (mapping->initialized &&
            intel_gmbus_is_valid_pin(dev_priv, mapping->i2c_pin))
                pin = mapping->i2c_pin;
        else
                pin = GMBUS_PIN_DPB;

        sdvo->i2c = intel_gmbus_get_adapter(dev_priv, pin);

        /*
         * With gmbus we should be able to drive sdvo i2c at 2MHz, but somehow
         * our code totally fails once we start using gmbus. Hence fall back to
         * bit banging for now.
         */
        intel_gmbus_force_bit(sdvo->i2c, true);
}

/* undo any changes intel_sdvo_select_i2c_bus() did to sdvo->i2c */
static void
intel_sdvo_unselect_i2c_bus(struct intel_sdvo *sdvo)
{
        intel_gmbus_force_bit(sdvo->i2c, false);
}

static bool
intel_sdvo_is_hdmi_connector(struct intel_sdvo *intel_sdvo, int device)
{
        return intel_sdvo_check_supp_encode(intel_sdvo);
}

static u8
intel_sdvo_get_slave_addr(struct drm_i915_private *dev_priv,
                          struct intel_sdvo *sdvo)
{
        struct sdvo_device_mapping *my_mapping, *other_mapping;

        if (sdvo->port == PORT_B) {
                my_mapping = &dev_priv->vbt.sdvo_mappings[0];
                other_mapping = &dev_priv->vbt.sdvo_mappings[1];
        } else {
                my_mapping = &dev_priv->vbt.sdvo_mappings[1];
                other_mapping = &dev_priv->vbt.sdvo_mappings[0];
        }

        /* If the BIOS described our SDVO device, take advantage of it. */
        if (my_mapping->slave_addr)
                return my_mapping->slave_addr;

        /*
         * If the BIOS only described a different SDVO device, use the
         * address that it isn't using.
         */
        if (other_mapping->slave_addr) {
                if (other_mapping->slave_addr == 0x70)
                        return 0x72;
                else
                        return 0x70;
        }

        /*
         * No SDVO device info is found for another DVO port,
         * so use mapping assumption we had before BIOS parsing.
         */
        if (sdvo->port == PORT_B)
                return 0x70;
        else
                return 0x72;
}

static int
intel_sdvo_connector_init(struct intel_sdvo_connector *connector,
                          struct intel_sdvo *encoder)
{
        struct drm_connector *drm_connector;
        int ret;

        drm_connector = &connector->base.base;
        ret = drm_connector_init(encoder->base.base.dev,
                           drm_connector,
                           &intel_sdvo_connector_funcs,
                           connector->base.base.connector_type);
        if (ret < 0)
                return ret;

        drm_connector_helper_add(drm_connector,
                                 &intel_sdvo_connector_helper_funcs);

        connector->base.base.interlace_allowed = 1;
        connector->base.base.doublescan_allowed = 0;
        connector->base.base.display_info.subpixel_order = SubPixelHorizontalRGB;
        connector->base.get_hw_state = intel_sdvo_connector_get_hw_state;

        intel_connector_attach_encoder(&connector->base, &encoder->base);

        return 0;
}

static void
intel_sdvo_add_hdmi_properties(struct intel_sdvo *intel_sdvo,
                               struct intel_sdvo_connector *connector)
{
        struct drm_i915_private *dev_priv = to_i915(connector->base.base.dev);

        intel_attach_force_audio_property(&connector->base.base);
        if (INTEL_GEN(dev_priv) >= 4 && IS_MOBILE(dev_priv)) {
                intel_attach_broadcast_rgb_property(&connector->base.base);
        }
        intel_attach_aspect_ratio_property(&connector->base.base);
        connector->base.base.state->picture_aspect_ratio = HDMI_PICTURE_ASPECT_NONE;
}

static struct intel_sdvo_connector *intel_sdvo_connector_alloc(void)
{
        struct intel_sdvo_connector *sdvo_connector;
        struct intel_sdvo_connector_state *conn_state;

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

        conn_state = kzalloc(sizeof(*conn_state), GFP_KERNEL);
        if (!conn_state) {
                kfree(sdvo_connector);
                return NULL;
        }

        __drm_atomic_helper_connector_reset(&sdvo_connector->base.base,
                                            &conn_state->base.base);

        return sdvo_connector;
}

static bool
intel_sdvo_dvi_init(struct intel_sdvo *intel_sdvo, int device)
{
        struct drm_encoder *encoder = &intel_sdvo->base.base;
        struct drm_i915_private *dev_priv = to_i915(encoder->dev);
        struct drm_connector *connector;
        struct intel_encoder *intel_encoder = to_intel_encoder(encoder);
        struct intel_connector *intel_connector;
        struct intel_sdvo_connector *intel_sdvo_connector;

        DRM_DEBUG_KMS("initialising DVI device %d\n", device);

        intel_sdvo_connector = intel_sdvo_connector_alloc();
        if (!intel_sdvo_connector)
                return false;

        if (device == 0) {
                intel_sdvo->controlled_output |= SDVO_OUTPUT_TMDS0;
                intel_sdvo_connector->output_flag = SDVO_OUTPUT_TMDS0;
        } else if (device == 1) {
                intel_sdvo->controlled_output |= SDVO_OUTPUT_TMDS1;
                intel_sdvo_connector->output_flag = SDVO_OUTPUT_TMDS1;
        }

        intel_connector = &intel_sdvo_connector->base;
        connector = &intel_connector->base;
        if (intel_sdvo_get_hotplug_support(intel_sdvo) &
                intel_sdvo_connector->output_flag) {
                intel_sdvo->hotplug_active |= intel_sdvo_connector->output_flag;
                /*
                 * Some SDVO devices have one-shot hotplug interrupts.
                 * Ensure that they get re-enabled when an interrupt happens.
                 */
                intel_encoder->hotplug = intel_sdvo_hotplug;
                intel_sdvo_enable_hotplug(intel_encoder);
        } else {
                intel_connector->polled = DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
        }
        encoder->encoder_type = DRM_MODE_ENCODER_TMDS;
        connector->connector_type = DRM_MODE_CONNECTOR_DVID;

        /* gen3 doesn't do the hdmi bits in the SDVO register */
        if (INTEL_GEN(dev_priv) >= 4 &&
            intel_sdvo_is_hdmi_connector(intel_sdvo, device)) {
                connector->connector_type = DRM_MODE_CONNECTOR_HDMIA;
                intel_sdvo->is_hdmi = true;
        }

        if (intel_sdvo_connector_init(intel_sdvo_connector, intel_sdvo) < 0) {
                kfree(intel_sdvo_connector);
                return false;
        }

        if (intel_sdvo->is_hdmi)
                intel_sdvo_add_hdmi_properties(intel_sdvo, intel_sdvo_connector);

        return true;
}

static bool
intel_sdvo_tv_init(struct intel_sdvo *intel_sdvo, int type)
{
        struct drm_encoder *encoder = &intel_sdvo->base.base;
        struct drm_connector *connector;
        struct intel_connector *intel_connector;
        struct intel_sdvo_connector *intel_sdvo_connector;

        DRM_DEBUG_KMS("initialising TV type %d\n", type);

        intel_sdvo_connector = intel_sdvo_connector_alloc();
        if (!intel_sdvo_connector)
                return false;

        intel_connector = &intel_sdvo_connector->base;
        connector = &intel_connector->base;
        encoder->encoder_type = DRM_MODE_ENCODER_TVDAC;
        connector->connector_type = DRM_MODE_CONNECTOR_SVIDEO;

        intel_sdvo->controlled_output |= type;
        intel_sdvo_connector->output_flag = type;

        intel_sdvo->is_tv = true;

        if (intel_sdvo_connector_init(intel_sdvo_connector, intel_sdvo) < 0) {
                kfree(intel_sdvo_connector);
                return false;
        }

        if (!intel_sdvo_tv_create_property(intel_sdvo, intel_sdvo_connector, type))
                goto err;

        if (!intel_sdvo_create_enhance_property(intel_sdvo, intel_sdvo_connector))
                goto err;

        return true;

err:
        intel_sdvo_destroy(connector);
        return false;
}

static bool
intel_sdvo_analog_init(struct intel_sdvo *intel_sdvo, int device)
{
        struct drm_encoder *encoder = &intel_sdvo->base.base;
        struct drm_connector *connector;
        struct intel_connector *intel_connector;
        struct intel_sdvo_connector *intel_sdvo_connector;

        DRM_DEBUG_KMS("initialising analog device %d\n", device);

        intel_sdvo_connector = intel_sdvo_connector_alloc();
        if (!intel_sdvo_connector)
                return false;

        intel_connector = &intel_sdvo_connector->base;
        connector = &intel_connector->base;
        intel_connector->polled = DRM_CONNECTOR_POLL_CONNECT;
        encoder->encoder_type = DRM_MODE_ENCODER_DAC;
        connector->connector_type = DRM_MODE_CONNECTOR_VGA;

        if (device == 0) {
                intel_sdvo->controlled_output |= SDVO_OUTPUT_RGB0;
                intel_sdvo_connector->output_flag = SDVO_OUTPUT_RGB0;
        } else if (device == 1) {
                intel_sdvo->controlled_output |= SDVO_OUTPUT_RGB1;
                intel_sdvo_connector->output_flag = SDVO_OUTPUT_RGB1;
        }

        if (intel_sdvo_connector_init(intel_sdvo_connector, intel_sdvo) < 0) {
                kfree(intel_sdvo_connector);
                return false;
        }

        return true;
}

static bool
intel_sdvo_lvds_init(struct intel_sdvo *intel_sdvo, int device)
{
        struct drm_encoder *encoder = &intel_sdvo->base.base;
        struct drm_connector *connector;
        struct intel_connector *intel_connector;
        struct intel_sdvo_connector *intel_sdvo_connector;

        DRM_DEBUG_KMS("initialising LVDS device %d\n", device);

        intel_sdvo_connector = intel_sdvo_connector_alloc();
        if (!intel_sdvo_connector)
                return false;

        intel_connector = &intel_sdvo_connector->base;
        connector = &intel_connector->base;
        encoder->encoder_type = DRM_MODE_ENCODER_LVDS;
        connector->connector_type = DRM_MODE_CONNECTOR_LVDS;

        if (device == 0) {
                intel_sdvo->controlled_output |= SDVO_OUTPUT_LVDS0;
                intel_sdvo_connector->output_flag = SDVO_OUTPUT_LVDS0;
        } else if (device == 1) {
                intel_sdvo->controlled_output |= SDVO_OUTPUT_LVDS1;
                intel_sdvo_connector->output_flag = SDVO_OUTPUT_LVDS1;
        }

        if (intel_sdvo_connector_init(intel_sdvo_connector, intel_sdvo) < 0) {
                kfree(intel_sdvo_connector);
                return false;
        }

        if (!intel_sdvo_create_enhance_property(intel_sdvo, intel_sdvo_connector))
                goto err;

        return true;

err:
        intel_sdvo_destroy(connector);
        return false;
}

static bool
intel_sdvo_output_setup(struct intel_sdvo *intel_sdvo, uint16_t flags)
{
        intel_sdvo->is_tv = false;
        intel_sdvo->is_lvds = false;

        /* SDVO requires XXX1 function may not exist unless it has XXX0 function.*/

        if (flags & SDVO_OUTPUT_TMDS0)
                if (!intel_sdvo_dvi_init(intel_sdvo, 0))
                        return false;

        if ((flags & SDVO_TMDS_MASK) == SDVO_TMDS_MASK)
                if (!intel_sdvo_dvi_init(intel_sdvo, 1))
                        return false;

        /* TV has no XXX1 function block */
        if (flags & SDVO_OUTPUT_SVID0)
                if (!intel_sdvo_tv_init(intel_sdvo, SDVO_OUTPUT_SVID0))
                        return false;

        if (flags & SDVO_OUTPUT_CVBS0)
                if (!intel_sdvo_tv_init(intel_sdvo, SDVO_OUTPUT_CVBS0))
                        return false;

        if (flags & SDVO_OUTPUT_YPRPB0)
                if (!intel_sdvo_tv_init(intel_sdvo, SDVO_OUTPUT_YPRPB0))
                        return false;

        if (flags & SDVO_OUTPUT_RGB0)
                if (!intel_sdvo_analog_init(intel_sdvo, 0))
                        return false;

        if ((flags & SDVO_RGB_MASK) == SDVO_RGB_MASK)
                if (!intel_sdvo_analog_init(intel_sdvo, 1))
                        return false;

        if (flags & SDVO_OUTPUT_LVDS0)
                if (!intel_sdvo_lvds_init(intel_sdvo, 0))
                        return false;

        if ((flags & SDVO_LVDS_MASK) == SDVO_LVDS_MASK)
                if (!intel_sdvo_lvds_init(intel_sdvo, 1))
                        return false;

        if ((flags & SDVO_OUTPUT_MASK) == 0) {
                unsigned char bytes[2];

                intel_sdvo->controlled_output = 0;
                memcpy(bytes, &intel_sdvo->caps.output_flags, 2);
                DRM_DEBUG_KMS("%s: Unknown SDVO output type (0x%02x%02x)\n",
                              SDVO_NAME(intel_sdvo),
                              bytes[0], bytes[1]);
                return false;
        }
        intel_sdvo->base.crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);

        return true;
}

static void intel_sdvo_output_cleanup(struct intel_sdvo *intel_sdvo)
{
        struct drm_device *dev = intel_sdvo->base.base.dev;
        struct drm_connector *connector, *tmp;

        list_for_each_entry_safe(connector, tmp,
                                 &dev->mode_config.connector_list, head) {
                if (intel_attached_encoder(connector) == &intel_sdvo->base) {
                        drm_connector_unregister(connector);
                        intel_sdvo_destroy(connector);
                }
        }
}

static bool intel_sdvo_tv_create_property(struct intel_sdvo *intel_sdvo,
                                          struct intel_sdvo_connector *intel_sdvo_connector,
                                          int type)
{
        struct drm_device *dev = intel_sdvo->base.base.dev;
        struct intel_sdvo_tv_format format;
        uint32_t format_map, i;

        if (!intel_sdvo_set_target_output(intel_sdvo, type))
                return false;

        BUILD_BUG_ON(sizeof(format) != 6);
        if (!intel_sdvo_get_value(intel_sdvo,
                                  SDVO_CMD_GET_SUPPORTED_TV_FORMATS,
                                  &format, sizeof(format)))
                return false;

        memcpy(&format_map, &format, min(sizeof(format_map), sizeof(format)));

        if (format_map == 0)
                return false;

        intel_sdvo_connector->format_supported_num = 0;
        for (i = 0 ; i < TV_FORMAT_NUM; i++)
                if (format_map & (1 << i))
                        intel_sdvo_connector->tv_format_supported[intel_sdvo_connector->format_supported_num++] = i;


        intel_sdvo_connector->tv_format =
                        drm_property_create(dev, DRM_MODE_PROP_ENUM,
                                            "mode", intel_sdvo_connector->format_supported_num);
        if (!intel_sdvo_connector->tv_format)
                return false;

        for (i = 0; i < intel_sdvo_connector->format_supported_num; i++)
                drm_property_add_enum(
                                intel_sdvo_connector->tv_format, i,
                                i, tv_format_names[intel_sdvo_connector->tv_format_supported[i]]);

        intel_sdvo_connector->base.base.state->tv.mode = intel_sdvo_connector->tv_format_supported[0];
        drm_object_attach_property(&intel_sdvo_connector->base.base.base,
                                   intel_sdvo_connector->tv_format, 0);
        return true;

}

#define _ENHANCEMENT(state_assignment, name, NAME) do { \
        if (enhancements.name) { \
                if (!intel_sdvo_get_value(intel_sdvo, SDVO_CMD_GET_MAX_##NAME, &data_value, 4) || \
                    !intel_sdvo_get_value(intel_sdvo, SDVO_CMD_GET_##NAME, &response, 2)) \
                        return false; \
                intel_sdvo_connector->name = \
                        drm_property_create_range(dev, 0, #name, 0, data_value[0]); \
                if (!intel_sdvo_connector->name) return false; \
                state_assignment = response; \
                drm_object_attach_property(&connector->base, \
                                           intel_sdvo_connector->name, 0); \
                DRM_DEBUG_KMS(#name ": max %d, default %d, current %d\n", \
                              data_value[0], data_value[1], response); \
        } \
} while (0)

#define ENHANCEMENT(state, name, NAME) _ENHANCEMENT((state)->name, name, NAME)

static bool
intel_sdvo_create_enhance_property_tv(struct intel_sdvo *intel_sdvo,
                                      struct intel_sdvo_connector *intel_sdvo_connector,
                                      struct intel_sdvo_enhancements_reply enhancements)
{
        struct drm_device *dev = intel_sdvo->base.base.dev;
        struct drm_connector *connector = &intel_sdvo_connector->base.base;
        struct drm_connector_state *conn_state = connector->state;
        struct intel_sdvo_connector_state *sdvo_state =
                to_intel_sdvo_connector_state(conn_state);
        uint16_t response, data_value[2];

        /* when horizontal overscan is supported, Add the left/right property */
        if (enhancements.overscan_h) {
                if (!intel_sdvo_get_value(intel_sdvo,
                                          SDVO_CMD_GET_MAX_OVERSCAN_H,
                                          &data_value, 4))
                        return false;

                if (!intel_sdvo_get_value(intel_sdvo,
                                          SDVO_CMD_GET_OVERSCAN_H,
                                          &response, 2))
                        return false;

                sdvo_state->tv.overscan_h = response;

                intel_sdvo_connector->max_hscan = data_value[0];
                intel_sdvo_connector->left =
                        drm_property_create_range(dev, 0, "left_margin", 0, data_value[0]);
                if (!intel_sdvo_connector->left)
                        return false;

                drm_object_attach_property(&connector->base,
                                           intel_sdvo_connector->left, 0);

                intel_sdvo_connector->right =
                        drm_property_create_range(dev, 0, "right_margin", 0, data_value[0]);
                if (!intel_sdvo_connector->right)
                        return false;

                drm_object_attach_property(&connector->base,
                                              intel_sdvo_connector->right, 0);
                DRM_DEBUG_KMS("h_overscan: max %d, "
                              "default %d, current %d\n",
                              data_value[0], data_value[1], response);
        }

        if (enhancements.overscan_v) {
                if (!intel_sdvo_get_value(intel_sdvo,
                                          SDVO_CMD_GET_MAX_OVERSCAN_V,
                                          &data_value, 4))
                        return false;

                if (!intel_sdvo_get_value(intel_sdvo,
                                          SDVO_CMD_GET_OVERSCAN_V,
                                          &response, 2))
                        return false;

                sdvo_state->tv.overscan_v = response;

                intel_sdvo_connector->max_vscan = data_value[0];
                intel_sdvo_connector->top =
                        drm_property_create_range(dev, 0,
                                            "top_margin", 0, data_value[0]);
                if (!intel_sdvo_connector->top)
                        return false;

                drm_object_attach_property(&connector->base,
                                           intel_sdvo_connector->top, 0);

                intel_sdvo_connector->bottom =
                        drm_property_create_range(dev, 0,
                                            "bottom_margin", 0, data_value[0]);
                if (!intel_sdvo_connector->bottom)
                        return false;

                drm_object_attach_property(&connector->base,
                                              intel_sdvo_connector->bottom, 0);
                DRM_DEBUG_KMS("v_overscan: max %d, "
                              "default %d, current %d\n",
                              data_value[0], data_value[1], response);
        }

        ENHANCEMENT(&sdvo_state->tv, hpos, HPOS);
        ENHANCEMENT(&sdvo_state->tv, vpos, VPOS);
        ENHANCEMENT(&conn_state->tv, saturation, SATURATION);
        ENHANCEMENT(&conn_state->tv, contrast, CONTRAST);
        ENHANCEMENT(&conn_state->tv, hue, HUE);
        ENHANCEMENT(&conn_state->tv, brightness, BRIGHTNESS);
        ENHANCEMENT(&sdvo_state->tv, sharpness, SHARPNESS);
        ENHANCEMENT(&sdvo_state->tv, flicker_filter, FLICKER_FILTER);
        ENHANCEMENT(&sdvo_state->tv, flicker_filter_adaptive, FLICKER_FILTER_ADAPTIVE);
        ENHANCEMENT(&sdvo_state->tv, flicker_filter_2d, FLICKER_FILTER_2D);
        _ENHANCEMENT(sdvo_state->tv.chroma_filter, tv_chroma_filter, TV_CHROMA_FILTER);
        _ENHANCEMENT(sdvo_state->tv.luma_filter, tv_luma_filter, TV_LUMA_FILTER);

        if (enhancements.dot_crawl) {
                if (!intel_sdvo_get_value(intel_sdvo, SDVO_CMD_GET_DOT_CRAWL, &response, 2))
                        return false;

                sdvo_state->tv.dot_crawl = response & 0x1;
                intel_sdvo_connector->dot_crawl =
                        drm_property_create_range(dev, 0, "dot_crawl", 0, 1);
                if (!intel_sdvo_connector->dot_crawl)
                        return false;

                drm_object_attach_property(&connector->base,
                                           intel_sdvo_connector->dot_crawl, 0);
                DRM_DEBUG_KMS("dot crawl: current %d\n", response);
        }

        return true;
}

static bool
intel_sdvo_create_enhance_property_lvds(struct intel_sdvo *intel_sdvo,
                                        struct intel_sdvo_connector *intel_sdvo_connector,
                                        struct intel_sdvo_enhancements_reply enhancements)
{
        struct drm_device *dev = intel_sdvo->base.base.dev;
        struct drm_connector *connector = &intel_sdvo_connector->base.base;
        uint16_t response, data_value[2];

        ENHANCEMENT(&connector->state->tv, brightness, BRIGHTNESS);

        return true;
}
#undef ENHANCEMENT
#undef _ENHANCEMENT

static bool intel_sdvo_create_enhance_property(struct intel_sdvo *intel_sdvo,
                                               struct intel_sdvo_connector *intel_sdvo_connector)
{
        union {
                struct intel_sdvo_enhancements_reply reply;
                uint16_t response;
        } enhancements;

        BUILD_BUG_ON(sizeof(enhancements) != 2);

        if (!intel_sdvo_get_value(intel_sdvo,
                                  SDVO_CMD_GET_SUPPORTED_ENHANCEMENTS,
                                  &enhancements, sizeof(enhancements)) ||
            enhancements.response == 0) {
                DRM_DEBUG_KMS("No enhancement is supported\n");
                return true;
        }

        if (IS_TV(intel_sdvo_connector))
                return intel_sdvo_create_enhance_property_tv(intel_sdvo, intel_sdvo_connector, enhancements.reply);
        else if (IS_LVDS(intel_sdvo_connector))
                return intel_sdvo_create_enhance_property_lvds(intel_sdvo, intel_sdvo_connector, enhancements.reply);
        else
                return true;
}

static int intel_sdvo_ddc_proxy_xfer(struct i2c_adapter *adapter,
                                     struct i2c_msg *msgs,
                                     int num)
{
        struct intel_sdvo *sdvo = adapter->algo_data;

        if (!intel_sdvo_set_control_bus_switch(sdvo, sdvo->ddc_bus))
                return -EIO;

        return sdvo->i2c->algo->master_xfer(sdvo->i2c, msgs, num);
}

static u32 intel_sdvo_ddc_proxy_func(struct i2c_adapter *adapter)
{
        struct intel_sdvo *sdvo = adapter->algo_data;
        return sdvo->i2c->algo->functionality(sdvo->i2c);
}

static const struct i2c_algorithm intel_sdvo_ddc_proxy = {
        .master_xfer    = intel_sdvo_ddc_proxy_xfer,
        .functionality  = intel_sdvo_ddc_proxy_func
};

static bool
intel_sdvo_init_ddc_proxy(struct intel_sdvo *sdvo,
                          struct drm_i915_private *dev_priv)
{
        struct pci_dev *pdev = dev_priv->drm.pdev;

        sdvo->ddc.owner = THIS_MODULE;
        sdvo->ddc.class = I2C_CLASS_DDC;
        snprintf(sdvo->ddc.name, I2C_NAME_SIZE, "SDVO DDC proxy");
        sdvo->ddc.dev.parent = &pdev->dev;
        sdvo->ddc.algo_data = sdvo;
        sdvo->ddc.algo = &intel_sdvo_ddc_proxy;

        return i2c_add_adapter(&sdvo->ddc) == 0;
}