/*
 * Copyright © 2012 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 *
 * Authors:
 *    Keith Packard <keithp@keithp.com>
 *
 */

#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/slab.h>

#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_dp_helper.h>
#include <drm/drm_simple_kms_helper.h>

#include "gma_display.h"
#include "psb_drv.h"
#include "psb_intel_drv.h"
#include "psb_intel_reg.h"

/**
 * struct i2c_algo_dp_aux_data - driver interface structure for i2c over dp
 *                               aux algorithm
 * @running: set by the algo indicating whether an i2c is ongoing or whether
 *           the i2c bus is quiescent
 * @address: i2c target address for the currently ongoing transfer
 * @aux_ch: driver callback to transfer a single byte of the i2c payload
 */
struct i2c_algo_dp_aux_data {
        bool running;
        u16 address;
        int (*aux_ch) (struct i2c_adapter *adapter,
                       int mode, uint8_t write_byte,
                       uint8_t *read_byte);
};

/* Run a single AUX_CH I2C transaction, writing/reading data as necessary */
static int
i2c_algo_dp_aux_transaction(struct i2c_adapter *adapter, int mode,
                            uint8_t write_byte, uint8_t *read_byte)
{
        struct i2c_algo_dp_aux_data *algo_data = adapter->algo_data;
        int ret;

        ret = (*algo_data->aux_ch)(adapter, mode,
                                   write_byte, read_byte);
        return ret;
}

/*
 * I2C over AUX CH
 */

/*
 * Send the address. If the I2C link is running, this 'restarts'
 * the connection with the new address, this is used for doing
 * a write followed by a read (as needed for DDC)
 */
static int
i2c_algo_dp_aux_address(struct i2c_adapter *adapter, u16 address, bool reading)
{
        struct i2c_algo_dp_aux_data *algo_data = adapter->algo_data;
        int mode = MODE_I2C_START;
        int ret;

        if (reading)
                mode |= MODE_I2C_READ;
        else
                mode |= MODE_I2C_WRITE;
        algo_data->address = address;
        algo_data->running = true;
        ret = i2c_algo_dp_aux_transaction(adapter, mode, 0, NULL);
        return ret;
}

/*
 * Stop the I2C transaction. This closes out the link, sending
 * a bare address packet with the MOT bit turned off
 */
static void
i2c_algo_dp_aux_stop(struct i2c_adapter *adapter, bool reading)
{
        struct i2c_algo_dp_aux_data *algo_data = adapter->algo_data;
        int mode = MODE_I2C_STOP;

        if (reading)
                mode |= MODE_I2C_READ;
        else
                mode |= MODE_I2C_WRITE;
        if (algo_data->running) {
                (void) i2c_algo_dp_aux_transaction(adapter, mode, 0, NULL);
                algo_data->running = false;
        }
}

/*
 * Write a single byte to the current I2C address, the
 * the I2C link must be running or this returns -EIO
 */
static int
i2c_algo_dp_aux_put_byte(struct i2c_adapter *adapter, u8 byte)
{
        struct i2c_algo_dp_aux_data *algo_data = adapter->algo_data;
        int ret;

        if (!algo_data->running)
                return -EIO;

        ret = i2c_algo_dp_aux_transaction(adapter, MODE_I2C_WRITE, byte, NULL);
        return ret;
}

/*
 * Read a single byte from the current I2C address, the
 * I2C link must be running or this returns -EIO
 */
static int
i2c_algo_dp_aux_get_byte(struct i2c_adapter *adapter, u8 *byte_ret)
{
        struct i2c_algo_dp_aux_data *algo_data = adapter->algo_data;
        int ret;

        if (!algo_data->running)
                return -EIO;

        ret = i2c_algo_dp_aux_transaction(adapter, MODE_I2C_READ, 0, byte_ret);
        return ret;
}

static int
i2c_algo_dp_aux_xfer(struct i2c_adapter *adapter,
                     struct i2c_msg *msgs,
                     int num)
{
        int ret = 0;
        bool reading = false;
        int m;
        int b;

        for (m = 0; m < num; m++) {
                u16 len = msgs[m].len;
                u8 *buf = msgs[m].buf;
                reading = (msgs[m].flags & I2C_M_RD) != 0;
                ret = i2c_algo_dp_aux_address(adapter, msgs[m].addr, reading);
                if (ret < 0)
                        break;
                if (reading) {
                        for (b = 0; b < len; b++) {
                                ret = i2c_algo_dp_aux_get_byte(adapter, &buf[b]);
                                if (ret < 0)
                                        break;
                        }
                } else {
                        for (b = 0; b < len; b++) {
                                ret = i2c_algo_dp_aux_put_byte(adapter, buf[b]);
                                if (ret < 0)
                                        break;
                        }
                }
                if (ret < 0)
                        break;
        }
        if (ret >= 0)
                ret = num;
        i2c_algo_dp_aux_stop(adapter, reading);
        DRM_DEBUG_KMS("dp_aux_xfer return %d\n", ret);
        return ret;
}

static u32
i2c_algo_dp_aux_functionality(struct i2c_adapter *adapter)
{
        return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
               I2C_FUNC_SMBUS_READ_BLOCK_DATA |
               I2C_FUNC_SMBUS_BLOCK_PROC_CALL |
               I2C_FUNC_10BIT_ADDR;
}

static const struct i2c_algorithm i2c_dp_aux_algo = {
        .master_xfer    = i2c_algo_dp_aux_xfer,
        .functionality  = i2c_algo_dp_aux_functionality,
};

static void
i2c_dp_aux_reset_bus(struct i2c_adapter *adapter)
{
        (void) i2c_algo_dp_aux_address(adapter, 0, false);
        (void) i2c_algo_dp_aux_stop(adapter, false);
}

static int
i2c_dp_aux_prepare_bus(struct i2c_adapter *adapter)
{
        adapter->algo = &i2c_dp_aux_algo;
        adapter->retries = 3;
        i2c_dp_aux_reset_bus(adapter);
        return 0;
}

/*
 * FIXME: This is the old dp aux helper, gma500 is the last driver that needs to
 * be ported over to the new helper code in drm_dp_helper.c like i915 or radeon.
 */
static int
i2c_dp_aux_add_bus(struct i2c_adapter *adapter)
{
        int error;

        error = i2c_dp_aux_prepare_bus(adapter);
        if (error)
                return error;
        error = i2c_add_adapter(adapter);
        return error;
}

#define _wait_for(COND, MS, W) ({ \
        unsigned long timeout__ = jiffies + msecs_to_jiffies(MS);       \
        int ret__ = 0;                                                  \
        while (! (COND)) {                                              \
                if (time_after(jiffies, timeout__)) {                   \
                        ret__ = -ETIMEDOUT;                             \
                        break;                                          \
                }                                                       \
                if (W && !in_dbg_master()) msleep(W);                   \
        }                                                               \
        ret__;                                                          \
})      

#define wait_for(COND, MS) _wait_for(COND, MS, 1)

#define DP_LINK_CHECK_TIMEOUT   (10 * 1000)

#define DP_LINK_CONFIGURATION_SIZE      9

#define CDV_FAST_LINK_TRAIN     1

struct cdv_intel_dp {
        uint32_t output_reg;
        uint32_t DP;
        uint8_t  link_configuration[DP_LINK_CONFIGURATION_SIZE];
        bool has_audio;
        int force_audio;
        uint32_t color_range;
        uint8_t link_bw;
        uint8_t lane_count;
        uint8_t dpcd[4];
        struct gma_encoder *encoder;
        struct i2c_adapter adapter;
        struct i2c_algo_dp_aux_data algo;
        uint8_t train_set[4];
        uint8_t link_status[DP_LINK_STATUS_SIZE];
        int panel_power_up_delay;
        int panel_power_down_delay;
        int panel_power_cycle_delay;
        int backlight_on_delay;
        int backlight_off_delay;
        struct drm_display_mode *panel_fixed_mode;  /* for eDP */
        bool panel_on;
};

struct ddi_regoff {
        uint32_t        PreEmph1;
        uint32_t        PreEmph2;
        uint32_t        VSwing1;
        uint32_t        VSwing2;
        uint32_t        VSwing3;
        uint32_t        VSwing4;
        uint32_t        VSwing5;
};

static struct ddi_regoff ddi_DP_train_table[] = {
        {.PreEmph1 = 0x812c, .PreEmph2 = 0x8124, .VSwing1 = 0x8154,
        .VSwing2 = 0x8148, .VSwing3 = 0x814C, .VSwing4 = 0x8150,
        .VSwing5 = 0x8158,},
        {.PreEmph1 = 0x822c, .PreEmph2 = 0x8224, .VSwing1 = 0x8254,
        .VSwing2 = 0x8248, .VSwing3 = 0x824C, .VSwing4 = 0x8250,
        .VSwing5 = 0x8258,},
};

static uint32_t dp_vswing_premph_table[] = {
        0x55338954,     0x4000,
        0x554d8954,     0x2000,
        0x55668954,     0,
        0x559ac0d4,     0x6000,
};
/**
 * is_edp - is the given port attached to an eDP panel (either CPU or PCH)
 * @intel_dp: DP struct
 *
 * If a CPU or PCH DP output is attached to an eDP panel, this function
 * will return true, and false otherwise.
 */
static bool is_edp(struct gma_encoder *encoder)
{
        return encoder->type == INTEL_OUTPUT_EDP;
}


static void cdv_intel_dp_start_link_train(struct gma_encoder *encoder);
static void cdv_intel_dp_complete_link_train(struct gma_encoder *encoder);
static void cdv_intel_dp_link_down(struct gma_encoder *encoder);

static int
cdv_intel_dp_max_lane_count(struct gma_encoder *encoder)
{
        struct cdv_intel_dp *intel_dp = encoder->dev_priv;
        int max_lane_count = 4;

        if (intel_dp->dpcd[DP_DPCD_REV] >= 0x11) {
                max_lane_count = intel_dp->dpcd[DP_MAX_LANE_COUNT] & 0x1f;
                switch (max_lane_count) {
                case 1: case 2: case 4:
                        break;
                default:
                        max_lane_count = 4;
                }
        }
        return max_lane_count;
}

static int
cdv_intel_dp_max_link_bw(struct gma_encoder *encoder)
{
        struct cdv_intel_dp *intel_dp = encoder->dev_priv;
        int max_link_bw = intel_dp->dpcd[DP_MAX_LINK_RATE];

        switch (max_link_bw) {
        case DP_LINK_BW_1_62:
        case DP_LINK_BW_2_7:
                break;
        default:
                max_link_bw = DP_LINK_BW_1_62;
                break;
        }
        return max_link_bw;
}

static int
cdv_intel_dp_link_clock(uint8_t link_bw)
{
        if (link_bw == DP_LINK_BW_2_7)
                return 270000;
        else
                return 162000;
}

static int
cdv_intel_dp_link_required(int pixel_clock, int bpp)
{
        return (pixel_clock * bpp + 7) / 8;
}

static int
cdv_intel_dp_max_data_rate(int max_link_clock, int max_lanes)
{
        return (max_link_clock * max_lanes * 19) / 20;
}

static void cdv_intel_edp_panel_vdd_on(struct gma_encoder *intel_encoder)
{
        struct drm_device *dev = intel_encoder->base.dev;
        struct cdv_intel_dp *intel_dp = intel_encoder->dev_priv;
        u32 pp;

        if (intel_dp->panel_on) {
                DRM_DEBUG_KMS("Skip VDD on because of panel on\n");
                return;
        }       
        DRM_DEBUG_KMS("\n");

        pp = REG_READ(PP_CONTROL);

        pp |= EDP_FORCE_VDD;
        REG_WRITE(PP_CONTROL, pp);
        REG_READ(PP_CONTROL);
        msleep(intel_dp->panel_power_up_delay);
}

static void cdv_intel_edp_panel_vdd_off(struct gma_encoder *intel_encoder)
{
        struct drm_device *dev = intel_encoder->base.dev;
        u32 pp;

        DRM_DEBUG_KMS("\n");
        pp = REG_READ(PP_CONTROL);

        pp &= ~EDP_FORCE_VDD;
        REG_WRITE(PP_CONTROL, pp);
        REG_READ(PP_CONTROL);

}

/* Returns true if the panel was already on when called */
static bool cdv_intel_edp_panel_on(struct gma_encoder *intel_encoder)
{
        struct drm_device *dev = intel_encoder->base.dev;
        struct cdv_intel_dp *intel_dp = intel_encoder->dev_priv;
        u32 pp, idle_on_mask = PP_ON | PP_SEQUENCE_NONE;

        if (intel_dp->panel_on)
                return true;

        DRM_DEBUG_KMS("\n");
        pp = REG_READ(PP_CONTROL);
        pp &= ~PANEL_UNLOCK_MASK;

        pp |= (PANEL_UNLOCK_REGS | POWER_TARGET_ON);
        REG_WRITE(PP_CONTROL, pp);
        REG_READ(PP_CONTROL);

        if (wait_for(((REG_READ(PP_STATUS) & idle_on_mask) == idle_on_mask), 1000)) {
                DRM_DEBUG_KMS("Error in Powering up eDP panel, status %x\n", REG_READ(PP_STATUS));
                intel_dp->panel_on = false;
        } else
                intel_dp->panel_on = true;      
        msleep(intel_dp->panel_power_up_delay);

        return false;
}

static void cdv_intel_edp_panel_off (struct gma_encoder *intel_encoder)
{
        struct drm_device *dev = intel_encoder->base.dev;
        u32 pp, idle_off_mask = PP_ON ;
        struct cdv_intel_dp *intel_dp = intel_encoder->dev_priv;

        DRM_DEBUG_KMS("\n");

        pp = REG_READ(PP_CONTROL);

        if ((pp & POWER_TARGET_ON) == 0) 
                return;

        intel_dp->panel_on = false;
        pp &= ~PANEL_UNLOCK_MASK;
        /* ILK workaround: disable reset around power sequence */

        pp &= ~POWER_TARGET_ON;
        pp &= ~EDP_FORCE_VDD;
        pp &= ~EDP_BLC_ENABLE;
        REG_WRITE(PP_CONTROL, pp);
        REG_READ(PP_CONTROL);
        DRM_DEBUG_KMS("PP_STATUS %x\n", REG_READ(PP_STATUS));

        if (wait_for((REG_READ(PP_STATUS) & idle_off_mask) == 0, 1000)) {
                DRM_DEBUG_KMS("Error in turning off Panel\n");  
        }

        msleep(intel_dp->panel_power_cycle_delay);
        DRM_DEBUG_KMS("Over\n");
}

static void cdv_intel_edp_backlight_on (struct gma_encoder *intel_encoder)
{
        struct drm_device *dev = intel_encoder->base.dev;
        u32 pp;

        DRM_DEBUG_KMS("\n");
        /*
         * If we enable the backlight right away following a panel power
         * on, we may see slight flicker as the panel syncs with the eDP
         * link.  So delay a bit to make sure the image is solid before
         * allowing it to appear.
         */
        msleep(300);
        pp = REG_READ(PP_CONTROL);

        pp |= EDP_BLC_ENABLE;
        REG_WRITE(PP_CONTROL, pp);
        gma_backlight_enable(dev);
}

static void cdv_intel_edp_backlight_off (struct gma_encoder *intel_encoder)
{
        struct drm_device *dev = intel_encoder->base.dev;
        struct cdv_intel_dp *intel_dp = intel_encoder->dev_priv;
        u32 pp;

        DRM_DEBUG_KMS("\n");
        gma_backlight_disable(dev);
        msleep(10);
        pp = REG_READ(PP_CONTROL);

        pp &= ~EDP_BLC_ENABLE;
        REG_WRITE(PP_CONTROL, pp);
        msleep(intel_dp->backlight_off_delay);
}

static enum drm_mode_status
cdv_intel_dp_mode_valid(struct drm_connector *connector,
                    struct drm_display_mode *mode)
{
        struct gma_encoder *encoder = gma_attached_encoder(connector);
        struct cdv_intel_dp *intel_dp = encoder->dev_priv;
        int max_link_clock = cdv_intel_dp_link_clock(cdv_intel_dp_max_link_bw(encoder));
        int max_lanes = cdv_intel_dp_max_lane_count(encoder);
        struct drm_psb_private *dev_priv = connector->dev->dev_private;

        if (is_edp(encoder) && intel_dp->panel_fixed_mode) {
                if (mode->hdisplay > intel_dp->panel_fixed_mode->hdisplay)
                        return MODE_PANEL;
                if (mode->vdisplay > intel_dp->panel_fixed_mode->vdisplay)
                        return MODE_PANEL;
        }

        /* only refuse the mode on non eDP since we have seen some weird eDP panels
           which are outside spec tolerances but somehow work by magic */
        if (!is_edp(encoder) &&
            (cdv_intel_dp_link_required(mode->clock, dev_priv->edp.bpp)
             > cdv_intel_dp_max_data_rate(max_link_clock, max_lanes)))
                return MODE_CLOCK_HIGH;

        if (is_edp(encoder)) {
            if (cdv_intel_dp_link_required(mode->clock, 24)
                > cdv_intel_dp_max_data_rate(max_link_clock, max_lanes))
                return MODE_CLOCK_HIGH;
                
        }
        if (mode->clock < 10000)
                return MODE_CLOCK_LOW;

        return MODE_OK;
}

static uint32_t
pack_aux(uint8_t *src, int src_bytes)
{
        int     i;
        uint32_t v = 0;

        if (src_bytes > 4)
                src_bytes = 4;
        for (i = 0; i < src_bytes; i++)
                v |= ((uint32_t) src[i]) << ((3-i) * 8);
        return v;
}

static void
unpack_aux(uint32_t src, uint8_t *dst, int dst_bytes)
{
        int i;
        if (dst_bytes > 4)
                dst_bytes = 4;
        for (i = 0; i < dst_bytes; i++)
                dst[i] = src >> ((3-i) * 8);
}

static int
cdv_intel_dp_aux_ch(struct gma_encoder *encoder,
                uint8_t *send, int send_bytes,
                uint8_t *recv, int recv_size)
{
        struct cdv_intel_dp *intel_dp = encoder->dev_priv;
        uint32_t output_reg = intel_dp->output_reg;
        struct drm_device *dev = encoder->base.dev;
        uint32_t ch_ctl = output_reg + 0x10;
        uint32_t ch_data = ch_ctl + 4;
        int i;
        int recv_bytes;
        uint32_t status;
        uint32_t aux_clock_divider;
        int try, precharge;

        /* The clock divider is based off the hrawclk,
         * and would like to run at 2MHz. So, take the
         * hrawclk value and divide by 2 and use that
         * On CDV platform it uses 200MHz as hrawclk.
         *
         */
        aux_clock_divider = 200 / 2;

        precharge = 4;
        if (is_edp(encoder))
                precharge = 10;

        if (REG_READ(ch_ctl) & DP_AUX_CH_CTL_SEND_BUSY) {
                DRM_ERROR("dp_aux_ch not started status 0x%08x\n",
                          REG_READ(ch_ctl));
                return -EBUSY;
        }

        /* Must try at least 3 times according to DP spec */
        for (try = 0; try < 5; try++) {
                /* Load the send data into the aux channel data registers */
                for (i = 0; i < send_bytes; i += 4)
                        REG_WRITE(ch_data + i,
                                   pack_aux(send + i, send_bytes - i));
        
                /* Send the command and wait for it to complete */
                REG_WRITE(ch_ctl,
                           DP_AUX_CH_CTL_SEND_BUSY |
                           DP_AUX_CH_CTL_TIME_OUT_400us |
                           (send_bytes << DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT) |
                           (precharge << DP_AUX_CH_CTL_PRECHARGE_2US_SHIFT) |
                           (aux_clock_divider << DP_AUX_CH_CTL_BIT_CLOCK_2X_SHIFT) |
                           DP_AUX_CH_CTL_DONE |
                           DP_AUX_CH_CTL_TIME_OUT_ERROR |
                           DP_AUX_CH_CTL_RECEIVE_ERROR);
                for (;;) {
                        status = REG_READ(ch_ctl);
                        if ((status & DP_AUX_CH_CTL_SEND_BUSY) == 0)
                                break;
                        udelay(100);
                }
        
                /* Clear done status and any errors */
                REG_WRITE(ch_ctl,
                           status |
                           DP_AUX_CH_CTL_DONE |
                           DP_AUX_CH_CTL_TIME_OUT_ERROR |
                           DP_AUX_CH_CTL_RECEIVE_ERROR);
                if (status & DP_AUX_CH_CTL_DONE)
                        break;
        }

        if ((status & DP_AUX_CH_CTL_DONE) == 0) {
                DRM_ERROR("dp_aux_ch not done status 0x%08x\n", status);
                return -EBUSY;
        }

        /* Check for timeout or receive error.
         * Timeouts occur when the sink is not connected
         */
        if (status & DP_AUX_CH_CTL_RECEIVE_ERROR) {
                DRM_ERROR("dp_aux_ch receive error status 0x%08x\n", status);
                return -EIO;
        }

        /* Timeouts occur when the device isn't connected, so they're
         * "normal" -- don't fill the kernel log with these */
        if (status & DP_AUX_CH_CTL_TIME_OUT_ERROR) {
                DRM_DEBUG_KMS("dp_aux_ch timeout status 0x%08x\n", status);
                return -ETIMEDOUT;
        }

        /* Unload any bytes sent back from the other side */
        recv_bytes = ((status & DP_AUX_CH_CTL_MESSAGE_SIZE_MASK) >>
                      DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT);
        if (recv_bytes > recv_size)
                recv_bytes = recv_size;
        
        for (i = 0; i < recv_bytes; i += 4)
                unpack_aux(REG_READ(ch_data + i),
                           recv + i, recv_bytes - i);

        return recv_bytes;
}

/* Write data to the aux channel in native mode */
static int
cdv_intel_dp_aux_native_write(struct gma_encoder *encoder,
                          uint16_t address, uint8_t *send, int send_bytes)
{
        int ret;
        uint8_t msg[20];
        int msg_bytes;
        uint8_t ack;

        if (send_bytes > 16)
                return -1;
        msg[0] = DP_AUX_NATIVE_WRITE << 4;
        msg[1] = address >> 8;
        msg[2] = address & 0xff;
        msg[3] = send_bytes - 1;
        memcpy(&msg[4], send, send_bytes);
        msg_bytes = send_bytes + 4;
        for (;;) {
                ret = cdv_intel_dp_aux_ch(encoder, msg, msg_bytes, &ack, 1);
                if (ret < 0)
                        return ret;
                ack >>= 4;
                if ((ack & DP_AUX_NATIVE_REPLY_MASK) == DP_AUX_NATIVE_REPLY_ACK)
                        break;
                else if ((ack & DP_AUX_NATIVE_REPLY_MASK) == DP_AUX_NATIVE_REPLY_DEFER)
                        udelay(100);
                else
                        return -EIO;
        }
        return send_bytes;
}

/* Write a single byte to the aux channel in native mode */
static int
cdv_intel_dp_aux_native_write_1(struct gma_encoder *encoder,
                            uint16_t address, uint8_t byte)
{
        return cdv_intel_dp_aux_native_write(encoder, address, &byte, 1);
}

/* read bytes from a native aux channel */
static int
cdv_intel_dp_aux_native_read(struct gma_encoder *encoder,
                         uint16_t address, uint8_t *recv, int recv_bytes)
{
        uint8_t msg[4];
        int msg_bytes;
        uint8_t reply[20];
        int reply_bytes;
        uint8_t ack;
        int ret;

        msg[0] = DP_AUX_NATIVE_READ << 4;
        msg[1] = address >> 8;
        msg[2] = address & 0xff;
        msg[3] = recv_bytes - 1;

        msg_bytes = 4;
        reply_bytes = recv_bytes + 1;

        for (;;) {
                ret = cdv_intel_dp_aux_ch(encoder, msg, msg_bytes,
                                      reply, reply_bytes);
                if (ret == 0)
                        return -EPROTO;
                if (ret < 0)
                        return ret;
                ack = reply[0] >> 4;
                if ((ack & DP_AUX_NATIVE_REPLY_MASK) == DP_AUX_NATIVE_REPLY_ACK) {
                        memcpy(recv, reply + 1, ret - 1);
                        return ret - 1;
                }
                else if ((ack & DP_AUX_NATIVE_REPLY_MASK) == DP_AUX_NATIVE_REPLY_DEFER)
                        udelay(100);
                else
                        return -EIO;
        }
}

static int
cdv_intel_dp_i2c_aux_ch(struct i2c_adapter *adapter, int mode,
                    uint8_t write_byte, uint8_t *read_byte)
{
        struct i2c_algo_dp_aux_data *algo_data = adapter->algo_data;
        struct cdv_intel_dp *intel_dp = container_of(adapter,
                                                struct cdv_intel_dp,
                                                adapter);
        struct gma_encoder *encoder = intel_dp->encoder;
        uint16_t address = algo_data->address;
        uint8_t msg[5];
        uint8_t reply[2];
        unsigned retry;
        int msg_bytes;
        int reply_bytes;
        int ret;

        /* Set up the command byte */
        if (mode & MODE_I2C_READ)
                msg[0] = DP_AUX_I2C_READ << 4;
        else
                msg[0] = DP_AUX_I2C_WRITE << 4;

        if (!(mode & MODE_I2C_STOP))
                msg[0] |= DP_AUX_I2C_MOT << 4;

        msg[1] = address >> 8;
        msg[2] = address;

        switch (mode) {
        case MODE_I2C_WRITE:
                msg[3] = 0;
                msg[4] = write_byte;
                msg_bytes = 5;
                reply_bytes = 1;
                break;
        case MODE_I2C_READ:
                msg[3] = 0;
                msg_bytes = 4;
                reply_bytes = 2;
                break;
        default:
                msg_bytes = 3;
                reply_bytes = 1;
                break;
        }

        for (retry = 0; retry < 5; retry++) {
                ret = cdv_intel_dp_aux_ch(encoder,
                                      msg, msg_bytes,
                                      reply, reply_bytes);
                if (ret < 0) {
                        DRM_DEBUG_KMS("aux_ch failed %d\n", ret);
                        return ret;
                }

                switch ((reply[0] >> 4) & DP_AUX_NATIVE_REPLY_MASK) {
                case DP_AUX_NATIVE_REPLY_ACK:
                        /* I2C-over-AUX Reply field is only valid
                         * when paired with AUX ACK.
                         */
                        break;
                case DP_AUX_NATIVE_REPLY_NACK:
                        DRM_DEBUG_KMS("aux_ch native nack\n");
                        return -EREMOTEIO;
                case DP_AUX_NATIVE_REPLY_DEFER:
                        udelay(100);
                        continue;
                default:
                        DRM_ERROR("aux_ch invalid native reply 0x%02x\n",
                                  reply[0]);
                        return -EREMOTEIO;
                }

                switch ((reply[0] >> 4) & DP_AUX_I2C_REPLY_MASK) {
                case DP_AUX_I2C_REPLY_ACK:
                        if (mode == MODE_I2C_READ) {
                                *read_byte = reply[1];
                        }
                        return reply_bytes - 1;
                case DP_AUX_I2C_REPLY_NACK:
                        DRM_DEBUG_KMS("aux_i2c nack\n");
                        return -EREMOTEIO;
                case DP_AUX_I2C_REPLY_DEFER:
                        DRM_DEBUG_KMS("aux_i2c defer\n");
                        udelay(100);
                        break;
                default:
                        DRM_ERROR("aux_i2c invalid reply 0x%02x\n", reply[0]);
                        return -EREMOTEIO;
                }
        }

        DRM_ERROR("too many retries, giving up\n");
        return -EREMOTEIO;
}

static int
cdv_intel_dp_i2c_init(struct gma_connector *connector,
                      struct gma_encoder *encoder, const char *name)
{
        struct cdv_intel_dp *intel_dp = encoder->dev_priv;
        int ret;

        DRM_DEBUG_KMS("i2c_init %s\n", name);

        intel_dp->algo.running = false;
        intel_dp->algo.address = 0;
        intel_dp->algo.aux_ch = cdv_intel_dp_i2c_aux_ch;

        memset(&intel_dp->adapter, '\0', sizeof (intel_dp->adapter));
        intel_dp->adapter.owner = THIS_MODULE;
        intel_dp->adapter.class = I2C_CLASS_DDC;
        strncpy (intel_dp->adapter.name, name, sizeof(intel_dp->adapter.name) - 1);
        intel_dp->adapter.name[sizeof(intel_dp->adapter.name) - 1] = '\0';
        intel_dp->adapter.algo_data = &intel_dp->algo;
        intel_dp->adapter.dev.parent = connector->base.kdev;

        if (is_edp(encoder))
                cdv_intel_edp_panel_vdd_on(encoder);
        ret = i2c_dp_aux_add_bus(&intel_dp->adapter);
        if (is_edp(encoder))
                cdv_intel_edp_panel_vdd_off(encoder);
        
        return ret;
}

static void cdv_intel_fixed_panel_mode(struct drm_display_mode *fixed_mode,
        struct drm_display_mode *adjusted_mode)
{
        adjusted_mode->hdisplay = fixed_mode->hdisplay;
        adjusted_mode->hsync_start = fixed_mode->hsync_start;
        adjusted_mode->hsync_end = fixed_mode->hsync_end;
        adjusted_mode->htotal = fixed_mode->htotal;

        adjusted_mode->vdisplay = fixed_mode->vdisplay;
        adjusted_mode->vsync_start = fixed_mode->vsync_start;
        adjusted_mode->vsync_end = fixed_mode->vsync_end;
        adjusted_mode->vtotal = fixed_mode->vtotal;

        adjusted_mode->clock = fixed_mode->clock;

        drm_mode_set_crtcinfo(adjusted_mode, CRTC_INTERLACE_HALVE_V);
}

static bool
cdv_intel_dp_mode_fixup(struct drm_encoder *encoder, const struct drm_display_mode *mode,
                    struct drm_display_mode *adjusted_mode)
{
        struct drm_psb_private *dev_priv = encoder->dev->dev_private;
        struct gma_encoder *intel_encoder = to_gma_encoder(encoder);
        struct cdv_intel_dp *intel_dp = intel_encoder->dev_priv;
        int lane_count, clock;
        int max_lane_count = cdv_intel_dp_max_lane_count(intel_encoder);
        int max_clock = cdv_intel_dp_max_link_bw(intel_encoder) == DP_LINK_BW_2_7 ? 1 : 0;
        static int bws[2] = { DP_LINK_BW_1_62, DP_LINK_BW_2_7 };
        int refclock = mode->clock;
        int bpp = 24;

        if (is_edp(intel_encoder) && intel_dp->panel_fixed_mode) {
                cdv_intel_fixed_panel_mode(intel_dp->panel_fixed_mode, adjusted_mode);
                refclock = intel_dp->panel_fixed_mode->clock;
                bpp = dev_priv->edp.bpp;
        }

        for (lane_count = 1; lane_count <= max_lane_count; lane_count <<= 1) {
                for (clock = max_clock; clock >= 0; clock--) {
                        int link_avail = cdv_intel_dp_max_data_rate(cdv_intel_dp_link_clock(bws[clock]), lane_count);

                        if (cdv_intel_dp_link_required(refclock, bpp) <= link_avail) {
                                intel_dp->link_bw = bws[clock];
                                intel_dp->lane_count = lane_count;
                                adjusted_mode->clock = cdv_intel_dp_link_clock(intel_dp->link_bw);
                                DRM_DEBUG_KMS("Display port link bw %02x lane "
                                                "count %d clock %d\n",
                                       intel_dp->link_bw, intel_dp->lane_count,
                                       adjusted_mode->clock);
                                return true;
                        }
                }
        }
        if (is_edp(intel_encoder)) {
                /* okay we failed just pick the highest */
                intel_dp->lane_count = max_lane_count;
                intel_dp->link_bw = bws[max_clock];
                adjusted_mode->clock = cdv_intel_dp_link_clock(intel_dp->link_bw);
                DRM_DEBUG_KMS("Force picking display port link bw %02x lane "
                              "count %d clock %d\n",
                              intel_dp->link_bw, intel_dp->lane_count,
                              adjusted_mode->clock);

                return true;
        }
        return false;
}

struct cdv_intel_dp_m_n {
        uint32_t        tu;
        uint32_t        gmch_m;
        uint32_t        gmch_n;
        uint32_t        link_m;
        uint32_t        link_n;
};

static void
cdv_intel_reduce_ratio(uint32_t *num, uint32_t *den)
{
        /*
        while (*num > 0xffffff || *den > 0xffffff) {
                *num >>= 1;
                *den >>= 1;
        }*/
        uint64_t value, m;
        m = *num;
        value = m * (0x800000);
        m = do_div(value, *den);
        *num = value;
        *den = 0x800000;
}

static void
cdv_intel_dp_compute_m_n(int bpp,
                     int nlanes,
                     int pixel_clock,
                     int link_clock,
                     struct cdv_intel_dp_m_n *m_n)
{
        m_n->tu = 64;
        m_n->gmch_m = (pixel_clock * bpp + 7) >> 3;
        m_n->gmch_n = link_clock * nlanes;
        cdv_intel_reduce_ratio(&m_n->gmch_m, &m_n->gmch_n);
        m_n->link_m = pixel_clock;
        m_n->link_n = link_clock;
        cdv_intel_reduce_ratio(&m_n->link_m, &m_n->link_n);
}

void
cdv_intel_dp_set_m_n(struct drm_crtc *crtc, struct drm_display_mode *mode,
                 struct drm_display_mode *adjusted_mode)
{
        struct drm_device *dev = crtc->dev;
        struct drm_psb_private *dev_priv = dev->dev_private;
        struct drm_mode_config *mode_config = &dev->mode_config;
        struct drm_encoder *encoder;
        struct gma_crtc *gma_crtc = to_gma_crtc(crtc);
        int lane_count = 4, bpp = 24;
        struct cdv_intel_dp_m_n m_n;
        int pipe = gma_crtc->pipe;

        /*
         * Find the lane count in the intel_encoder private

         */
        list_for_each_entry(encoder, &mode_config->encoder_list, head) {
                struct gma_encoder *intel_encoder;
                struct cdv_intel_dp *intel_dp;

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

                intel_encoder = to_gma_encoder(encoder);
                intel_dp = intel_encoder->dev_priv;
                if (intel_encoder->type == INTEL_OUTPUT_DISPLAYPORT) {
                        lane_count = intel_dp->lane_count;
                        break;
                } else if (is_edp(intel_encoder)) {
                        lane_count = intel_dp->lane_count;
                        bpp = dev_priv->edp.bpp;
                        break;
                }
        }

        /*
         * Compute the GMCH and Link ratios. The '3' here is
         * the number of bytes_per_pixel post-LUT, which we always
         * set up for 8-bits of R/G/B, or 3 bytes total.
         */
        cdv_intel_dp_compute_m_n(bpp, lane_count,
                             mode->clock, adjusted_mode->clock, &m_n);

        {
                REG_WRITE(PIPE_GMCH_DATA_M(pipe),
                           ((m_n.tu - 1) << PIPE_GMCH_DATA_M_TU_SIZE_SHIFT) |
                           m_n.gmch_m);
                REG_WRITE(PIPE_GMCH_DATA_N(pipe), m_n.gmch_n);
                REG_WRITE(PIPE_DP_LINK_M(pipe), m_n.link_m);
                REG_WRITE(PIPE_DP_LINK_N(pipe), m_n.link_n);
        }
}

static void
cdv_intel_dp_mode_set(struct drm_encoder *encoder, struct drm_display_mode *mode,
                  struct drm_display_mode *adjusted_mode)
{
        struct gma_encoder *intel_encoder = to_gma_encoder(encoder);
        struct drm_crtc *crtc = encoder->crtc;
        struct gma_crtc *gma_crtc = to_gma_crtc(crtc);
        struct cdv_intel_dp *intel_dp = intel_encoder->dev_priv;
        struct drm_device *dev = encoder->dev;

        intel_dp->DP = DP_VOLTAGE_0_4 | DP_PRE_EMPHASIS_0;
        intel_dp->DP |= intel_dp->color_range;

        if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
                intel_dp->DP |= DP_SYNC_HS_HIGH;
        if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
                intel_dp->DP |= DP_SYNC_VS_HIGH;

        intel_dp->DP |= DP_LINK_TRAIN_OFF;

        switch (intel_dp->lane_count) {
        case 1:
                intel_dp->DP |= DP_PORT_WIDTH_1;
                break;
        case 2:
                intel_dp->DP |= DP_PORT_WIDTH_2;
                break;
        case 4:
                intel_dp->DP |= DP_PORT_WIDTH_4;
                break;
        }
        if (intel_dp->has_audio)
                intel_dp->DP |= DP_AUDIO_OUTPUT_ENABLE;

        memset(intel_dp->link_configuration, 0, DP_LINK_CONFIGURATION_SIZE);
        intel_dp->link_configuration[0] = intel_dp->link_bw;
        intel_dp->link_configuration[1] = intel_dp->lane_count;

        /*
         * Check for DPCD version > 1.1 and enhanced framing support
         */
        if (intel_dp->dpcd[DP_DPCD_REV] >= 0x11 &&
            (intel_dp->dpcd[DP_MAX_LANE_COUNT] & DP_ENHANCED_FRAME_CAP)) {
                intel_dp->link_configuration[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
                intel_dp->DP |= DP_ENHANCED_FRAMING;
        }

        /* CPT DP's pipe select is decided in TRANS_DP_CTL */
        if (gma_crtc->pipe == 1)
                intel_dp->DP |= DP_PIPEB_SELECT;

        REG_WRITE(intel_dp->output_reg, (intel_dp->DP | DP_PORT_EN));
        DRM_DEBUG_KMS("DP expected reg is %x\n", intel_dp->DP);
        if (is_edp(intel_encoder)) {
                uint32_t pfit_control;
                cdv_intel_edp_panel_on(intel_encoder);

                if (mode->hdisplay != adjusted_mode->hdisplay ||
                            mode->vdisplay != adjusted_mode->vdisplay)
                        pfit_control = PFIT_ENABLE;
                else
                        pfit_control = 0;

                pfit_control |= gma_crtc->pipe << PFIT_PIPE_SHIFT;

                REG_WRITE(PFIT_CONTROL, pfit_control);
        }
}


/* If the sink supports it, try to set the power state appropriately */
static void cdv_intel_dp_sink_dpms(struct gma_encoder *encoder, int mode)
{
        struct cdv_intel_dp *intel_dp = encoder->dev_priv;
        int ret, i;

        /* Should have a valid DPCD by this point */
        if (intel_dp->dpcd[DP_DPCD_REV] < 0x11)
                return;

        if (mode != DRM_MODE_DPMS_ON) {
                ret = cdv_intel_dp_aux_native_write_1(encoder, DP_SET_POWER,
                                                  DP_SET_POWER_D3);
                if (ret != 1)
                        DRM_DEBUG_DRIVER("failed to write sink power state\n");
        } else {
                /*
                 * When turning on, we need to retry for 1ms to give the sink
                 * time to wake up.
                 */
                for (i = 0; i < 3; i++) {
                        ret = cdv_intel_dp_aux_native_write_1(encoder,
                                                          DP_SET_POWER,
                                                          DP_SET_POWER_D0);
                        if (ret == 1)
                                break;
                        udelay(1000);
                }
        }
}

static void cdv_intel_dp_prepare(struct drm_encoder *encoder)
{
        struct gma_encoder *intel_encoder = to_gma_encoder(encoder);
        int edp = is_edp(intel_encoder);

        if (edp) {
                cdv_intel_edp_backlight_off(intel_encoder);
                cdv_intel_edp_panel_off(intel_encoder);
                cdv_intel_edp_panel_vdd_on(intel_encoder);
        }
        /* Wake up the sink first */
        cdv_intel_dp_sink_dpms(intel_encoder, DRM_MODE_DPMS_ON);
        cdv_intel_dp_link_down(intel_encoder);
        if (edp)
                cdv_intel_edp_panel_vdd_off(intel_encoder);
}

static void cdv_intel_dp_commit(struct drm_encoder *encoder)
{
        struct gma_encoder *intel_encoder = to_gma_encoder(encoder);
        int edp = is_edp(intel_encoder);

        if (edp)
                cdv_intel_edp_panel_on(intel_encoder);
        cdv_intel_dp_start_link_train(intel_encoder);
        cdv_intel_dp_complete_link_train(intel_encoder);
        if (edp)
                cdv_intel_edp_backlight_on(intel_encoder);
}

static void
cdv_intel_dp_dpms(struct drm_encoder *encoder, int mode)
{
        struct gma_encoder *intel_encoder = to_gma_encoder(encoder);
        struct cdv_intel_dp *intel_dp = intel_encoder->dev_priv;
        struct drm_device *dev = encoder->dev;
        uint32_t dp_reg = REG_READ(intel_dp->output_reg);
        int edp = is_edp(intel_encoder);

        if (mode != DRM_MODE_DPMS_ON) {
                if (edp) {
                        cdv_intel_edp_backlight_off(intel_encoder);
                        cdv_intel_edp_panel_vdd_on(intel_encoder);
                }
                cdv_intel_dp_sink_dpms(intel_encoder, mode);
                cdv_intel_dp_link_down(intel_encoder);
                if (edp) {
                        cdv_intel_edp_panel_vdd_off(intel_encoder);
                        cdv_intel_edp_panel_off(intel_encoder);
                }
        } else {
                if (edp)
                        cdv_intel_edp_panel_on(intel_encoder);
                cdv_intel_dp_sink_dpms(intel_encoder, mode);
                if (!(dp_reg & DP_PORT_EN)) {
                        cdv_intel_dp_start_link_train(intel_encoder);
                        cdv_intel_dp_complete_link_train(intel_encoder);
                }
                if (edp)
                        cdv_intel_edp_backlight_on(intel_encoder);
        }
}

/*
 * Native read with retry for link status and receiver capability reads for
 * cases where the sink may still be asleep.
 */
static bool
cdv_intel_dp_aux_native_read_retry(struct gma_encoder *encoder, uint16_t address,
                               uint8_t *recv, int recv_bytes)
{
        int ret, i;

        /*
         * Sinks are *supposed* to come up within 1ms from an off state,
         * but we're also supposed to retry 3 times per the spec.
         */
        for (i = 0; i < 3; i++) {
                ret = cdv_intel_dp_aux_native_read(encoder, address, recv,
                                               recv_bytes);
                if (ret == recv_bytes)
                        return true;
                udelay(1000);
        }

        return false;
}

/*
 * Fetch AUX CH registers 0x202 - 0x207 which contain
 * link status information
 */
static bool
cdv_intel_dp_get_link_status(struct gma_encoder *encoder)
{
        struct cdv_intel_dp *intel_dp = encoder->dev_priv;
        return cdv_intel_dp_aux_native_read_retry(encoder,
                                              DP_LANE0_1_STATUS,
                                              intel_dp->link_status,
                                              DP_LINK_STATUS_SIZE);
}

static uint8_t
cdv_intel_dp_link_status(uint8_t link_status[DP_LINK_STATUS_SIZE],
                     int r)
{
        return link_status[r - DP_LANE0_1_STATUS];
}

static uint8_t
cdv_intel_get_adjust_request_voltage(uint8_t link_status[DP_LINK_STATUS_SIZE],
                                 int lane)
{
        int         i = DP_ADJUST_REQUEST_LANE0_1 + (lane >> 1);
        int         s = ((lane & 1) ?
                         DP_ADJUST_VOLTAGE_SWING_LANE1_SHIFT :
                         DP_ADJUST_VOLTAGE_SWING_LANE0_SHIFT);
        uint8_t l = cdv_intel_dp_link_status(link_status, i);

        return ((l >> s) & 3) << DP_TRAIN_VOLTAGE_SWING_SHIFT;
}

static uint8_t
cdv_intel_get_adjust_request_pre_emphasis(uint8_t link_status[DP_LINK_STATUS_SIZE],
                                      int lane)
{
        int         i = DP_ADJUST_REQUEST_LANE0_1 + (lane >> 1);
        int         s = ((lane & 1) ?
                         DP_ADJUST_PRE_EMPHASIS_LANE1_SHIFT :
                         DP_ADJUST_PRE_EMPHASIS_LANE0_SHIFT);
        uint8_t l = cdv_intel_dp_link_status(link_status, i);

        return ((l >> s) & 3) << DP_TRAIN_PRE_EMPHASIS_SHIFT;
}

#define CDV_DP_VOLTAGE_MAX          DP_TRAIN_VOLTAGE_SWING_LEVEL_3

static void
cdv_intel_get_adjust_train(struct gma_encoder *encoder)
{
        struct cdv_intel_dp *intel_dp = encoder->dev_priv;
        uint8_t v = 0;
        uint8_t p = 0;
        int lane;

        for (lane = 0; lane < intel_dp->lane_count; lane++) {
                uint8_t this_v = cdv_intel_get_adjust_request_voltage(intel_dp->link_status, lane);
                uint8_t this_p = cdv_intel_get_adjust_request_pre_emphasis(intel_dp->link_status, lane);

                if (this_v > v)
                        v = this_v;
                if (this_p > p)
                        p = this_p;
        }
        
        if (v >= CDV_DP_VOLTAGE_MAX)
                v = CDV_DP_VOLTAGE_MAX | DP_TRAIN_MAX_SWING_REACHED;

        if (p == DP_TRAIN_PRE_EMPHASIS_MASK)
                p |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
                
        for (lane = 0; lane < 4; lane++)
                intel_dp->train_set[lane] = v | p;
}


static uint8_t
cdv_intel_get_lane_status(uint8_t link_status[DP_LINK_STATUS_SIZE],
                      int lane)
{
        int i = DP_LANE0_1_STATUS + (lane >> 1);
        int s = (lane & 1) * 4;
        uint8_t l = cdv_intel_dp_link_status(link_status, i);

        return (l >> s) & 0xf;
}

/* Check for clock recovery is done on all channels */
static bool
cdv_intel_clock_recovery_ok(uint8_t link_status[DP_LINK_STATUS_SIZE], int lane_count)
{
        int lane;
        uint8_t lane_status;

        for (lane = 0; lane < lane_count; lane++) {
                lane_status = cdv_intel_get_lane_status(link_status, lane);
                if ((lane_status & DP_LANE_CR_DONE) == 0)
                        return false;
        }
        return true;
}

/* Check to see if channel eq is done on all channels */
#define CHANNEL_EQ_BITS (DP_LANE_CR_DONE|\
                         DP_LANE_CHANNEL_EQ_DONE|\
                         DP_LANE_SYMBOL_LOCKED)
static bool
cdv_intel_channel_eq_ok(struct gma_encoder *encoder)
{
        struct cdv_intel_dp *intel_dp = encoder->dev_priv;
        uint8_t lane_align;
        uint8_t lane_status;
        int lane;

        lane_align = cdv_intel_dp_link_status(intel_dp->link_status,
                                          DP_LANE_ALIGN_STATUS_UPDATED);
        if ((lane_align & DP_INTERLANE_ALIGN_DONE) == 0)
                return false;
        for (lane = 0; lane < intel_dp->lane_count; lane++) {
                lane_status = cdv_intel_get_lane_status(intel_dp->link_status, lane);
                if ((lane_status & CHANNEL_EQ_BITS) != CHANNEL_EQ_BITS)
                        return false;
        }
        return true;
}

static bool
cdv_intel_dp_set_link_train(struct gma_encoder *encoder,
                        uint32_t dp_reg_value,
                        uint8_t dp_train_pat)
{
        
        struct drm_device *dev = encoder->base.dev;
        int ret;
        struct cdv_intel_dp *intel_dp = encoder->dev_priv;

        REG_WRITE(intel_dp->output_reg, dp_reg_value);
        REG_READ(intel_dp->output_reg);

        ret = cdv_intel_dp_aux_native_write_1(encoder,
                                    DP_TRAINING_PATTERN_SET,
                                    dp_train_pat);

        if (ret != 1) {
                DRM_DEBUG_KMS("Failure in setting link pattern %x\n",
                                dp_train_pat);
                return false;
        }

        return true;
}


static bool
cdv_intel_dplink_set_level(struct gma_encoder *encoder,
                        uint8_t dp_train_pat)
{
        
        int ret;
        struct cdv_intel_dp *intel_dp = encoder->dev_priv;

        ret = cdv_intel_dp_aux_native_write(encoder,
                                        DP_TRAINING_LANE0_SET,
                                        intel_dp->train_set,
                                        intel_dp->lane_count);

        if (ret != intel_dp->lane_count) {
                DRM_DEBUG_KMS("Failure in setting level %d, lane_cnt= %d\n",
                                intel_dp->train_set[0], intel_dp->lane_count);
                return false;
        }
        return true;
}

static void
cdv_intel_dp_set_vswing_premph(struct gma_encoder *encoder, uint8_t signal_level)
{
        struct drm_device *dev = encoder->base.dev;
        struct cdv_intel_dp *intel_dp = encoder->dev_priv;
        struct ddi_regoff *ddi_reg;
        int vswing, premph, index;

        if (intel_dp->output_reg == DP_B)
                ddi_reg = &ddi_DP_train_table[0];
        else
                ddi_reg = &ddi_DP_train_table[1];

        vswing = (signal_level & DP_TRAIN_VOLTAGE_SWING_MASK);
        premph = ((signal_level & DP_TRAIN_PRE_EMPHASIS_MASK)) >>
                                DP_TRAIN_PRE_EMPHASIS_SHIFT;

        if (vswing + premph > 3)
                return;
#ifdef CDV_FAST_LINK_TRAIN
        return;
#endif
        DRM_DEBUG_KMS("Test2\n");
        //return ;
        cdv_sb_reset(dev);
        /* ;Swing voltage programming
        ;gfx_dpio_set_reg(0xc058, 0x0505313A) */
        cdv_sb_write(dev, ddi_reg->VSwing5, 0x0505313A);

        /* ;gfx_dpio_set_reg(0x8154, 0x43406055) */
        cdv_sb_write(dev, ddi_reg->VSwing1, 0x43406055);

        /* ;gfx_dpio_set_reg(0x8148, 0x55338954)
         * The VSwing_PreEmph table is also considered based on the vswing/premp
         */
        index = (vswing + premph) * 2;
        if (premph == 1 && vswing == 1) {
                cdv_sb_write(dev, ddi_reg->VSwing2, 0x055738954);
        } else
                cdv_sb_write(dev, ddi_reg->VSwing2, dp_vswing_premph_table[index]);

        /* ;gfx_dpio_set_reg(0x814c, 0x40802040) */
        if ((vswing + premph) == DP_TRAIN_VOLTAGE_SWING_LEVEL_3)
                cdv_sb_write(dev, ddi_reg->VSwing3, 0x70802040);
        else
                cdv_sb_write(dev, ddi_reg->VSwing3, 0x40802040);

        /* ;gfx_dpio_set_reg(0x8150, 0x2b405555) */
        /* cdv_sb_write(dev, ddi_reg->VSwing4, 0x2b405555); */

        /* ;gfx_dpio_set_reg(0x8154, 0xc3406055) */
        cdv_sb_write(dev, ddi_reg->VSwing1, 0xc3406055);

        /* ;Pre emphasis programming
         * ;gfx_dpio_set_reg(0xc02c, 0x1f030040)
         */
        cdv_sb_write(dev, ddi_reg->PreEmph1, 0x1f030040);

        /* ;gfx_dpio_set_reg(0x8124, 0x00004000) */
        index = 2 * premph + 1;
        cdv_sb_write(dev, ddi_reg->PreEmph2, dp_vswing_premph_table[index]);
        return; 
}


/* Enable corresponding port and start training pattern 1 */
static void
cdv_intel_dp_start_link_train(struct gma_encoder *encoder)
{
        struct drm_device *dev = encoder->base.dev;
        struct cdv_intel_dp *intel_dp = encoder->dev_priv;
        int i;
        uint8_t voltage;
        bool clock_recovery = false;
        int tries;
        u32 reg;
        uint32_t DP = intel_dp->DP;

        DP |= DP_PORT_EN;
        DP &= ~DP_LINK_TRAIN_MASK;
                
        reg = DP;       
        reg |= DP_LINK_TRAIN_PAT_1;
        /* Enable output, wait for it to become active */
        REG_WRITE(intel_dp->output_reg, reg);
        REG_READ(intel_dp->output_reg);
        gma_wait_for_vblank(dev);

        DRM_DEBUG_KMS("Link config\n");
        /* Write the link configuration data */
        cdv_intel_dp_aux_native_write(encoder, DP_LINK_BW_SET,
                                  intel_dp->link_configuration,
                                  2);

        memset(intel_dp->train_set, 0, 4);
        voltage = 0;
        tries = 0;
        clock_recovery = false;

        DRM_DEBUG_KMS("Start train\n");
                reg = DP | DP_LINK_TRAIN_PAT_1;


        for (;;) {
                /* Use intel_dp->train_set[0] to set the voltage and pre emphasis values */
                DRM_DEBUG_KMS("DP Link Train Set %x, Link_config %x, %x\n",
                                intel_dp->train_set[0],
                                intel_dp->link_configuration[0],
                                intel_dp->link_configuration[1]);

                if (!cdv_intel_dp_set_link_train(encoder, reg, DP_TRAINING_PATTERN_1)) {
                        DRM_DEBUG_KMS("Failure in aux-transfer setting pattern 1\n");
                }
                cdv_intel_dp_set_vswing_premph(encoder, intel_dp->train_set[0]);
                /* Set training pattern 1 */

                cdv_intel_dplink_set_level(encoder, DP_TRAINING_PATTERN_1);

                udelay(200);
                if (!cdv_intel_dp_get_link_status(encoder))
                        break;

                DRM_DEBUG_KMS("DP Link status %x, %x, %x, %x, %x, %x\n",
                                intel_dp->link_status[0], intel_dp->link_status[1], intel_dp->link_status[2],
                                intel_dp->link_status[3], intel_dp->link_status[4], intel_dp->link_status[5]);

                if (cdv_intel_clock_recovery_ok(intel_dp->link_status, intel_dp->lane_count)) {
                        DRM_DEBUG_KMS("PT1 train is done\n");
                        clock_recovery = true;
                        break;
                }

                /* Check to see if we've tried the max voltage */
                for (i = 0; i < intel_dp->lane_count; i++)
                        if ((intel_dp->train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0)
                                break;
                if (i == intel_dp->lane_count)
                        break;

                /* Check to see if we've tried the same voltage 5 times */
                if ((intel_dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) {
                        ++tries;
                        if (tries == 5)
                                break;
                } else
                        tries = 0;
                voltage = intel_dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;

                /* Compute new intel_dp->train_set as requested by target */
                cdv_intel_get_adjust_train(encoder);

        }

        if (!clock_recovery) {
                DRM_DEBUG_KMS("failure in DP patter 1 training, train set %x\n", intel_dp->train_set[0]);
        }
        
        intel_dp->DP = DP;
}

static void
cdv_intel_dp_complete_link_train(struct gma_encoder *encoder)
{
        struct drm_device *dev = encoder->base.dev;
        struct cdv_intel_dp *intel_dp = encoder->dev_priv;
        int tries, cr_tries;
        u32 reg;
        uint32_t DP = intel_dp->DP;

        /* channel equalization */
        tries = 0;
        cr_tries = 0;

        DRM_DEBUG_KMS("\n");
                reg = DP | DP_LINK_TRAIN_PAT_2;

        for (;;) {

                DRM_DEBUG_KMS("DP Link Train Set %x, Link_config %x, %x\n",
                                intel_dp->train_set[0],
                                intel_dp->link_configuration[0],
                                intel_dp->link_configuration[1]);
                /* channel eq pattern */

                if (!cdv_intel_dp_set_link_train(encoder, reg,
                                             DP_TRAINING_PATTERN_2)) {
                        DRM_DEBUG_KMS("Failure in aux-transfer setting pattern 2\n");
                }
                /* Use intel_dp->train_set[0] to set the voltage and pre emphasis values */

                if (cr_tries > 5) {
                        DRM_ERROR("failed to train DP, aborting\n");
                        cdv_intel_dp_link_down(encoder);
                        break;
                }

                cdv_intel_dp_set_vswing_premph(encoder, intel_dp->train_set[0]);

                cdv_intel_dplink_set_level(encoder, DP_TRAINING_PATTERN_2);

                udelay(1000);
                if (!cdv_intel_dp_get_link_status(encoder))
                        break;

                DRM_DEBUG_KMS("DP Link status %x, %x, %x, %x, %x, %x\n",
                                intel_dp->link_status[0], intel_dp->link_status[1], intel_dp->link_status[2],
                                intel_dp->link_status[3], intel_dp->link_status[4], intel_dp->link_status[5]);

                /* Make sure clock is still ok */
                if (!cdv_intel_clock_recovery_ok(intel_dp->link_status, intel_dp->lane_count)) {
                        cdv_intel_dp_start_link_train(encoder);
                        cr_tries++;
                        continue;
                }

                if (cdv_intel_channel_eq_ok(encoder)) {
                        DRM_DEBUG_KMS("PT2 train is done\n");
                        break;
                }

                /* Try 5 times, then try clock recovery if that fails */
                if (tries > 5) {
                        cdv_intel_dp_link_down(encoder);
                        cdv_intel_dp_start_link_train(encoder);
                        tries = 0;
                        cr_tries++;
                        continue;
                }

                /* Compute new intel_dp->train_set as requested by target */
                cdv_intel_get_adjust_train(encoder);
                ++tries;

        }

        reg = DP | DP_LINK_TRAIN_OFF;

        REG_WRITE(intel_dp->output_reg, reg);
        REG_READ(intel_dp->output_reg);
        cdv_intel_dp_aux_native_write_1(encoder,
                                    DP_TRAINING_PATTERN_SET, DP_TRAINING_PATTERN_DISABLE);
}

static void
cdv_intel_dp_link_down(struct gma_encoder *encoder)
{
        struct drm_device *dev = encoder->base.dev;
        struct cdv_intel_dp *intel_dp = encoder->dev_priv;
        uint32_t DP = intel_dp->DP;

        if ((REG_READ(intel_dp->output_reg) & DP_PORT_EN) == 0)
                return;

        DRM_DEBUG_KMS("\n");


        {
                DP &= ~DP_LINK_TRAIN_MASK;
                REG_WRITE(intel_dp->output_reg, DP | DP_LINK_TRAIN_PAT_IDLE);
        }
        REG_READ(intel_dp->output_reg);

        msleep(17);

        REG_WRITE(intel_dp->output_reg, DP & ~DP_PORT_EN);
        REG_READ(intel_dp->output_reg);
}

static enum drm_connector_status cdv_dp_detect(struct gma_encoder *encoder)
{
        struct cdv_intel_dp *intel_dp = encoder->dev_priv;
        enum drm_connector_status status;

        status = connector_status_disconnected;
        if (cdv_intel_dp_aux_native_read(encoder, 0x000, intel_dp->dpcd,
                                     sizeof (intel_dp->dpcd)) == sizeof (intel_dp->dpcd))
        {
                if (intel_dp->dpcd[DP_DPCD_REV] != 0)
                        status = connector_status_connected;
        }
        if (status == connector_status_connected)
                DRM_DEBUG_KMS("DPCD: Rev=%x LN_Rate=%x LN_CNT=%x LN_DOWNSP=%x\n",
                        intel_dp->dpcd[0], intel_dp->dpcd[1],
                        intel_dp->dpcd[2], intel_dp->dpcd[3]);
        return status;
}

/**
 * Uses CRT_HOTPLUG_EN and CRT_HOTPLUG_STAT to detect DP connection.
 *
 * \return true if DP port is connected.
 * \return false if DP port is disconnected.
 */
static enum drm_connector_status
cdv_intel_dp_detect(struct drm_connector *connector, bool force)
{
        struct gma_encoder *encoder = gma_attached_encoder(connector);
        struct cdv_intel_dp *intel_dp = encoder->dev_priv;
        enum drm_connector_status status;
        struct edid *edid = NULL;
        int edp = is_edp(encoder);

        intel_dp->has_audio = false;

        if (edp)
                cdv_intel_edp_panel_vdd_on(encoder);
        status = cdv_dp_detect(encoder);
        if (status != connector_status_connected) {
                if (edp)
                        cdv_intel_edp_panel_vdd_off(encoder);
                return status;
        }

        if (intel_dp->force_audio) {
                intel_dp->has_audio = intel_dp->force_audio > 0;
        } else {
                edid = drm_get_edid(connector, &intel_dp->adapter);
                if (edid) {
                        intel_dp->has_audio = drm_detect_monitor_audio(edid);
                        kfree(edid);
                }
        }
        if (edp)
                cdv_intel_edp_panel_vdd_off(encoder);

        return connector_status_connected;
}

static int cdv_intel_dp_get_modes(struct drm_connector *connector)
{
        struct gma_encoder *intel_encoder = gma_attached_encoder(connector);
        struct cdv_intel_dp *intel_dp = intel_encoder->dev_priv;
        struct edid *edid = NULL;
        int ret = 0;
        int edp = is_edp(intel_encoder);


        edid = drm_get_edid(connector, &intel_dp->adapter);
        if (edid) {
                drm_connector_update_edid_property(connector, edid);
                ret = drm_add_edid_modes(connector, edid);
                kfree(edid);
        }

        if (is_edp(intel_encoder)) {
                struct drm_device *dev = connector->dev;
                struct drm_psb_private *dev_priv = dev->dev_private;
                
                cdv_intel_edp_panel_vdd_off(intel_encoder);
                if (ret) {
                        if (edp && !intel_dp->panel_fixed_mode) {
                                struct drm_display_mode *newmode;
                                list_for_each_entry(newmode, &connector->probed_modes,
                                            head) {
                                        if (newmode->type & DRM_MODE_TYPE_PREFERRED) {
                                                intel_dp->panel_fixed_mode =
                                                        drm_mode_duplicate(dev, newmode);
                                                break;
                                        }
                                }
                        }

                        return ret;
                }
                if (!intel_dp->panel_fixed_mode && dev_priv->lfp_lvds_vbt_mode) {
                        intel_dp->panel_fixed_mode =
                                drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
                        if (intel_dp->panel_fixed_mode) {
                                intel_dp->panel_fixed_mode->type |=
                                        DRM_MODE_TYPE_PREFERRED;
                        }
                }
                if (intel_dp->panel_fixed_mode != NULL) {
                        struct drm_display_mode *mode;
                        mode = drm_mode_duplicate(dev, intel_dp->panel_fixed_mode);
                        drm_mode_probed_add(connector, mode);
                        return 1;
                }
        }

        return ret;
}

static bool
cdv_intel_dp_detect_audio(struct drm_connector *connector)
{
        struct gma_encoder *encoder = gma_attached_encoder(connector);
        struct cdv_intel_dp *intel_dp = encoder->dev_priv;
        struct edid *edid;
        bool has_audio = false;
        int edp = is_edp(encoder);

        if (edp)
                cdv_intel_edp_panel_vdd_on(encoder);

        edid = drm_get_edid(connector, &intel_dp->adapter);
        if (edid) {
                has_audio = drm_detect_monitor_audio(edid);
                kfree(edid);
        }
        if (edp)
                cdv_intel_edp_panel_vdd_off(encoder);

        return has_audio;
}

static int
cdv_intel_dp_set_property(struct drm_connector *connector,
                      struct drm_property *property,
                      uint64_t val)
{
        struct drm_psb_private *dev_priv = connector->dev->dev_private;
        struct gma_encoder *encoder = gma_attached_encoder(connector);
        struct cdv_intel_dp *intel_dp = encoder->dev_priv;
        int ret;

        ret = drm_object_property_set_value(&connector->base, property, val);
        if (ret)
                return ret;

        if (property == dev_priv->force_audio_property) {
                int i = val;
                bool has_audio;

                if (i == intel_dp->force_audio)
                        return 0;

                intel_dp->force_audio = i;

                if (i == 0)
                        has_audio = cdv_intel_dp_detect_audio(connector);
                else
                        has_audio = i > 0;

                if (has_audio == intel_dp->has_audio)
                        return 0;

                intel_dp->has_audio = has_audio;
                goto done;
        }

        if (property == dev_priv->broadcast_rgb_property) {
                if (val == !!intel_dp->color_range)
                        return 0;

                intel_dp->color_range = val ? DP_COLOR_RANGE_16_235 : 0;
                goto done;
        }

        return -EINVAL;

done:
        if (encoder->base.crtc) {
                struct drm_crtc *crtc = encoder->base.crtc;
                drm_crtc_helper_set_mode(crtc, &crtc->mode,
                                         crtc->x, crtc->y,
                                         crtc->primary->fb);
        }

        return 0;
}

static void
cdv_intel_dp_destroy(struct drm_connector *connector)
{
        struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
        struct cdv_intel_dp *intel_dp = gma_encoder->dev_priv;

        if (is_edp(gma_encoder)) {
        /*      cdv_intel_panel_destroy_backlight(connector->dev); */
                kfree(intel_dp->panel_fixed_mode);
                intel_dp->panel_fixed_mode = NULL;
        }
        i2c_del_adapter(&intel_dp->adapter);
        drm_connector_unregister(connector);
        drm_connector_cleanup(connector);
        kfree(connector);
}

static const struct drm_encoder_helper_funcs cdv_intel_dp_helper_funcs = {
        .dpms = cdv_intel_dp_dpms,
        .mode_fixup = cdv_intel_dp_mode_fixup,
        .prepare = cdv_intel_dp_prepare,
        .mode_set = cdv_intel_dp_mode_set,
        .commit = cdv_intel_dp_commit,
};

static const struct drm_connector_funcs cdv_intel_dp_connector_funcs = {
        .dpms = drm_helper_connector_dpms,
        .detect = cdv_intel_dp_detect,
        .fill_modes = drm_helper_probe_single_connector_modes,
        .set_property = cdv_intel_dp_set_property,
        .destroy = cdv_intel_dp_destroy,
};

static const struct drm_connector_helper_funcs cdv_intel_dp_connector_helper_funcs = {
        .get_modes = cdv_intel_dp_get_modes,
        .mode_valid = cdv_intel_dp_mode_valid,
        .best_encoder = gma_best_encoder,
};

static void cdv_intel_dp_add_properties(struct drm_connector *connector)
{
        cdv_intel_attach_force_audio_property(connector);
        cdv_intel_attach_broadcast_rgb_property(connector);
}

/* check the VBT to see whether the eDP is on DP-D port */
static bool cdv_intel_dpc_is_edp(struct drm_device *dev)
{
        struct drm_psb_private *dev_priv = dev->dev_private;
        struct child_device_config *p_child;
        int i;

        if (!dev_priv->child_dev_num)
                return false;

        for (i = 0; i < dev_priv->child_dev_num; i++) {
                p_child = dev_priv->child_dev + i;

                if (p_child->dvo_port == PORT_IDPC &&
                    p_child->device_type == DEVICE_TYPE_eDP)
                        return true;
        }
        return false;
}

/* Cedarview display clock gating

   We need this disable dot get correct behaviour while enabling
   DP/eDP. TODO - investigate if we can turn it back to normality
   after enabling */
static void cdv_disable_intel_clock_gating(struct drm_device *dev)
{
        u32 reg_value;
        reg_value = REG_READ(DSPCLK_GATE_D);

        reg_value |= (DPUNIT_PIPEB_GATE_DISABLE |
                        DPUNIT_PIPEA_GATE_DISABLE |
                        DPCUNIT_CLOCK_GATE_DISABLE |
                        DPLSUNIT_CLOCK_GATE_DISABLE |
                        DPOUNIT_CLOCK_GATE_DISABLE |
                        DPIOUNIT_CLOCK_GATE_DISABLE);   

        REG_WRITE(DSPCLK_GATE_D, reg_value);

        udelay(500);            
}

void
cdv_intel_dp_init(struct drm_device *dev, struct psb_intel_mode_device *mode_dev, int output_reg)
{
        struct gma_encoder *gma_encoder;
        struct gma_connector *gma_connector;
        struct drm_connector *connector;
        struct drm_encoder *encoder;
        struct cdv_intel_dp *intel_dp;
        const char *name = NULL;
        int type = DRM_MODE_CONNECTOR_DisplayPort;

        gma_encoder = kzalloc(sizeof(struct gma_encoder), GFP_KERNEL);
        if (!gma_encoder)
                return;
        gma_connector = kzalloc(sizeof(struct gma_connector), GFP_KERNEL);
        if (!gma_connector)
                goto err_connector;
        intel_dp = kzalloc(sizeof(struct cdv_intel_dp), GFP_KERNEL);
        if (!intel_dp)
                goto err_priv;

        if ((output_reg == DP_C) && cdv_intel_dpc_is_edp(dev))
                type = DRM_MODE_CONNECTOR_eDP;

        connector = &gma_connector->base;
        encoder = &gma_encoder->base;

        drm_connector_init(dev, connector, &cdv_intel_dp_connector_funcs, type);
        drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_TMDS);

        gma_connector_attach_encoder(gma_connector, gma_encoder);

        if (type == DRM_MODE_CONNECTOR_DisplayPort)
                gma_encoder->type = INTEL_OUTPUT_DISPLAYPORT;
        else
                gma_encoder->type = INTEL_OUTPUT_EDP;


        gma_encoder->dev_priv=intel_dp;
        intel_dp->encoder = gma_encoder;
        intel_dp->output_reg = output_reg;
        
        drm_encoder_helper_add(encoder, &cdv_intel_dp_helper_funcs);
        drm_connector_helper_add(connector, &cdv_intel_dp_connector_helper_funcs);

        connector->polled = DRM_CONNECTOR_POLL_HPD;
        connector->interlace_allowed = false;
        connector->doublescan_allowed = false;

        drm_connector_register(connector);

        /* Set up the DDC bus. */
        switch (output_reg) {
                case DP_B:
                        name = "DPDDC-B";
                        gma_encoder->ddi_select = (DP_MASK | DDI0_SELECT);
                        break;
                case DP_C:
                        name = "DPDDC-C";
                        gma_encoder->ddi_select = (DP_MASK | DDI1_SELECT);
                        break;
        }

        cdv_disable_intel_clock_gating(dev);

        cdv_intel_dp_i2c_init(gma_connector, gma_encoder, name);
        /* FIXME:fail check */
        cdv_intel_dp_add_properties(connector);

        if (is_edp(gma_encoder)) {
                int ret;
                struct edp_power_seq cur;
                u32 pp_on, pp_off, pp_div;
                u32 pwm_ctrl;

                pp_on = REG_READ(PP_CONTROL);
                pp_on &= ~PANEL_UNLOCK_MASK;
                pp_on |= PANEL_UNLOCK_REGS;
                
                REG_WRITE(PP_CONTROL, pp_on);

                pwm_ctrl = REG_READ(BLC_PWM_CTL2);
                pwm_ctrl |= PWM_PIPE_B;
                REG_WRITE(BLC_PWM_CTL2, pwm_ctrl);

                pp_on = REG_READ(PP_ON_DELAYS);
                pp_off = REG_READ(PP_OFF_DELAYS);
                pp_div = REG_READ(PP_DIVISOR);
        
                /* Pull timing values out of registers */
                cur.t1_t3 = (pp_on & PANEL_POWER_UP_DELAY_MASK) >>
                        PANEL_POWER_UP_DELAY_SHIFT;

                cur.t8 = (pp_on & PANEL_LIGHT_ON_DELAY_MASK) >>
                        PANEL_LIGHT_ON_DELAY_SHIFT;

                cur.t9 = (pp_off & PANEL_LIGHT_OFF_DELAY_MASK) >>
                        PANEL_LIGHT_OFF_DELAY_SHIFT;

                cur.t10 = (pp_off & PANEL_POWER_DOWN_DELAY_MASK) >>
                        PANEL_POWER_DOWN_DELAY_SHIFT;

                cur.t11_t12 = ((pp_div & PANEL_POWER_CYCLE_DELAY_MASK) >>
                               PANEL_POWER_CYCLE_DELAY_SHIFT);

                DRM_DEBUG_KMS("cur t1_t3 %d t8 %d t9 %d t10 %d t11_t12 %d\n",
                              cur.t1_t3, cur.t8, cur.t9, cur.t10, cur.t11_t12);


                intel_dp->panel_power_up_delay = cur.t1_t3 / 10;
                intel_dp->backlight_on_delay = cur.t8 / 10;
                intel_dp->backlight_off_delay = cur.t9 / 10;
                intel_dp->panel_power_down_delay = cur.t10 / 10;
                intel_dp->panel_power_cycle_delay = (cur.t11_t12 - 1) * 100;

                DRM_DEBUG_KMS("panel power up delay %d, power down delay %d, power cycle delay %d\n",
                              intel_dp->panel_power_up_delay, intel_dp->panel_power_down_delay,
                              intel_dp->panel_power_cycle_delay);

                DRM_DEBUG_KMS("backlight on delay %d, off delay %d\n",
                              intel_dp->backlight_on_delay, intel_dp->backlight_off_delay);


                cdv_intel_edp_panel_vdd_on(gma_encoder);
                ret = cdv_intel_dp_aux_native_read(gma_encoder, DP_DPCD_REV,
                                               intel_dp->dpcd,
                                               sizeof(intel_dp->dpcd));
                cdv_intel_edp_panel_vdd_off(gma_encoder);
                if (ret <= 0) {
                        /* if this fails, presume the device is a ghost */
                        DRM_INFO("failed to retrieve link info, disabling eDP\n");
                        drm_encoder_cleanup(encoder);
                        cdv_intel_dp_destroy(connector);
                        goto err_priv;
                } else {
                        DRM_DEBUG_KMS("DPCD: Rev=%x LN_Rate=%x LN_CNT=%x LN_DOWNSP=%x\n",
                                intel_dp->dpcd[0], intel_dp->dpcd[1], 
                                intel_dp->dpcd[2], intel_dp->dpcd[3]);
                        
                }
                /* The CDV reference driver moves pnale backlight setup into the displays that
                   have a backlight: this is a good idea and one we should probably adopt, however
                   we need to migrate all the drivers before we can do that */
                /*cdv_intel_panel_setup_backlight(dev); */
        }
        return;

err_priv:
        kfree(gma_connector);
err_connector:
        kfree(gma_encoder);
}