i915/src/intel_ddi.c

/*
 * Copyright © 2012-2013 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:
 *    Eugeni Dodonov <eugeni.dodonov@intel.com>
 *
 */

/*
 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
 */

#include "i915_drv.h"
#include "intel_drv.h"

/* HDMI/DVI modes ignore everything but the last 2 items. So we share
 * them for both DP and FDI transports, allowing those ports to
 * automatically adapt to HDMI connections as well
 */
static const u32 hsw_ddi_translations_dp[] = {
    0x00FFFFFF, 0x0006000E,     /* DP parameters */
    0x00D75FFF, 0x0005000A,
    0x00C30FFF, 0x00040006,
    0x80AAAFFF, 0x000B0000,
    0x00FFFFFF, 0x0005000A,
    0x00D75FFF, 0x000C0004,
    0x80C30FFF, 0x000B0000,
    0x00FFFFFF, 0x00040006,
    0x80D75FFF, 0x000B0000,
    0x00FFFFFF, 0x00040006      /* HDMI parameters */
};

static const u32 hsw_ddi_translations_fdi[] = {
    0x00FFFFFF, 0x0007000E,     /* FDI parameters */
    0x00D75FFF, 0x000F000A,
    0x00C30FFF, 0x00060006,
    0x00AAAFFF, 0x001E0000,
    0x00FFFFFF, 0x000F000A,
    0x00D75FFF, 0x00160004,
    0x00C30FFF, 0x001E0000,
    0x00FFFFFF, 0x00060006,
    0x00D75FFF, 0x001E0000,
    0x00FFFFFF, 0x00040006      /* HDMI parameters */
};

static enum port intel_ddi_get_encoder_port(struct intel_encoder *intel_encoder)
{
    struct drm_encoder *encoder = &intel_encoder->base;
    int type = intel_encoder->type;

    if (type == INTEL_OUTPUT_DISPLAYPORT || type == INTEL_OUTPUT_EDP ||
        type == INTEL_OUTPUT_HDMI || type == INTEL_OUTPUT_UNKNOWN) {
        struct intel_digital_port *intel_dig_port =
            enc_to_dig_port(encoder);
        return intel_dig_port->port;
    } else if (type == INTEL_OUTPUT_ANALOG) {
        return PORT_E;
    } else {
        DRM_ERROR("Invalid DDI encoder type %d\n", type);
        BUG();
    }
    return I915_MAX_PORTS;
}

/* On Haswell, DDI port buffers must be programmed with correct values
 * in advance. The buffer values are different for FDI and DP modes,
 * but the HDMI/DVI fields are shared among those. So we program the DDI
 * in either FDI or DP modes only, as HDMI connections will work with both
 * of those
 */
static void intel_prepare_ddi_buffers(struct drm_device *dev, enum port port,
                      bool use_fdi_mode)
{
    struct drm_i915_private *dev_priv = dev->dev_private;
    u32 reg;
    int i;
    const u32 *ddi_translations = ((use_fdi_mode) ?
        hsw_ddi_translations_fdi :
        hsw_ddi_translations_dp);

    DRM_DEBUG_DRIVER("Initializing DDI buffers for port %c in %s mode\n",
            port_name(port),
            use_fdi_mode ? "FDI" : "DP");

    if (use_fdi_mode && (port != PORT_E))
        DRM_ERROR("Programming port %c in FDI mode, this probably will not work.",
        port_name(port));

    for (i=0, reg=DDI_BUF_TRANS(port); i < ARRAY_SIZE(hsw_ddi_translations_fdi); i++) {
        I915_WRITE(reg, ddi_translations[i]);
        reg += 4;
    }
}

/* Program DDI buffers translations for DP. By default, program ports A-D in DP
 * mode and port E for FDI.
 */
void intel_prepare_ddi(struct drm_device *dev)
{
    int port;

    if (!HAS_DDI(dev))
        return;

    for (port = PORT_A; port < PORT_E; port++)
        intel_prepare_ddi_buffers(dev, port, false);

    /* DDI E is the suggested one to work in FDI mode, so program is as such
     * by default. It will have to be re-programmed in case a digital DP
     * output will be detected on it
     */
    intel_prepare_ddi_buffers(dev, PORT_E, true);
}

static const long hsw_ddi_buf_ctl_values[] = {
    DDI_BUF_EMP_400MV_0DB_HSW,
    DDI_BUF_EMP_400MV_3_5DB_HSW,
    DDI_BUF_EMP_400MV_6DB_HSW,
    DDI_BUF_EMP_400MV_9_5DB_HSW,
    DDI_BUF_EMP_600MV_0DB_HSW,
    DDI_BUF_EMP_600MV_3_5DB_HSW,
    DDI_BUF_EMP_600MV_6DB_HSW,
    DDI_BUF_EMP_800MV_0DB_HSW,
    DDI_BUF_EMP_800MV_3_5DB_HSW
};

static void intel_wait_ddi_buf_idle(struct drm_i915_private *dev_priv,
                    enum port port)
{
    uint32_t reg = DDI_BUF_CTL(port);
    int i;

    for (i = 0; i < 8; i++) {
        udelay(1);
        if (I915_READ(reg) & DDI_BUF_IS_IDLE)
            return;
    }
    DRM_ERROR("Timeout waiting for DDI BUF %c idle bit\n", port_name(port));
}

/* Starting with Haswell, different DDI ports can work in FDI mode for
 * connection to the PCH-located connectors. For this, it is necessary to train
 * both the DDI port and PCH receiver for the desired DDI buffer settings.
 *
 * The recommended port to work in FDI mode is DDI E, which we use here. Also,
 * please note that when FDI mode is active on DDI E, it shares 2 lines with
 * DDI A (which is used for eDP)
 */

void hsw_fdi_link_train(struct drm_crtc *crtc)
{
    struct drm_device *dev = crtc->dev;
    struct drm_i915_private *dev_priv = dev->dev_private;
    struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
    u32 temp, i, rx_ctl_val;

    /* Set the FDI_RX_MISC pwrdn lanes and the 2 workarounds listed at the
     * mode set "sequence for CRT port" document:
     * - TP1 to TP2 time with the default value
     * - FDI delay to 90h
     *
     * WaFDIAutoLinkSetTimingOverrride:hsw
     */
    I915_WRITE(_FDI_RXA_MISC, FDI_RX_PWRDN_LANE1_VAL(2) |
                  FDI_RX_PWRDN_LANE0_VAL(2) |
                  FDI_RX_TP1_TO_TP2_48 | FDI_RX_FDI_DELAY_90);

    /* Enable the PCH Receiver FDI PLL */
    rx_ctl_val = dev_priv->fdi_rx_config | FDI_RX_ENHANCE_FRAME_ENABLE |
             FDI_RX_PLL_ENABLE |
             FDI_DP_PORT_WIDTH(intel_crtc->config.fdi_lanes);
    I915_WRITE(_FDI_RXA_CTL, rx_ctl_val);
    POSTING_READ(_FDI_RXA_CTL);
    udelay(220);

    /* Switch from Rawclk to PCDclk */
    rx_ctl_val |= FDI_PCDCLK;
    I915_WRITE(_FDI_RXA_CTL, rx_ctl_val);

    /* Configure Port Clock Select */
    I915_WRITE(PORT_CLK_SEL(PORT_E), intel_crtc->ddi_pll_sel);

    /* Start the training iterating through available voltages and emphasis,
     * testing each value twice. */
    for (i = 0; i < ARRAY_SIZE(hsw_ddi_buf_ctl_values) * 2; i++) {
        /* Configure DP_TP_CTL with auto-training */
        I915_WRITE(DP_TP_CTL(PORT_E),
                    DP_TP_CTL_FDI_AUTOTRAIN |
                    DP_TP_CTL_ENHANCED_FRAME_ENABLE |
                    DP_TP_CTL_LINK_TRAIN_PAT1 |
                    DP_TP_CTL_ENABLE);

        /* Configure and enable DDI_BUF_CTL for DDI E with next voltage.
         * DDI E does not support port reversal, the functionality is
         * achieved on the PCH side in FDI_RX_CTL, so no need to set the
         * port reversal bit */
        I915_WRITE(DDI_BUF_CTL(PORT_E),
               DDI_BUF_CTL_ENABLE |
               ((intel_crtc->config.fdi_lanes - 1) << 1) |
               hsw_ddi_buf_ctl_values[i / 2]);
        POSTING_READ(DDI_BUF_CTL(PORT_E));

        udelay(600);

        /* Program PCH FDI Receiver TU */
        I915_WRITE(_FDI_RXA_TUSIZE1, TU_SIZE(64));

        /* Enable PCH FDI Receiver with auto-training */
        rx_ctl_val |= FDI_RX_ENABLE | FDI_LINK_TRAIN_AUTO;
        I915_WRITE(_FDI_RXA_CTL, rx_ctl_val);
        POSTING_READ(_FDI_RXA_CTL);

        /* Wait for FDI receiver lane calibration */
        udelay(30);

        /* Unset FDI_RX_MISC pwrdn lanes */
        temp = I915_READ(_FDI_RXA_MISC);
        temp &= ~(FDI_RX_PWRDN_LANE1_MASK | FDI_RX_PWRDN_LANE0_MASK);
        I915_WRITE(_FDI_RXA_MISC, temp);
        POSTING_READ(_FDI_RXA_MISC);

        /* Wait for FDI auto training time */
        udelay(5);

        temp = I915_READ(DP_TP_STATUS(PORT_E));
        if (temp & DP_TP_STATUS_AUTOTRAIN_DONE) {
            DRM_DEBUG_KMS("FDI link training done on step %d\n", i);

            /* Enable normal pixel sending for FDI */
            I915_WRITE(DP_TP_CTL(PORT_E),
                   DP_TP_CTL_FDI_AUTOTRAIN |
                   DP_TP_CTL_LINK_TRAIN_NORMAL |
                   DP_TP_CTL_ENHANCED_FRAME_ENABLE |
                   DP_TP_CTL_ENABLE);

            return;
        }

        temp = I915_READ(DDI_BUF_CTL(PORT_E));
        temp &= ~DDI_BUF_CTL_ENABLE;
        I915_WRITE(DDI_BUF_CTL(PORT_E), temp);
        POSTING_READ(DDI_BUF_CTL(PORT_E));

        /* Disable DP_TP_CTL and FDI_RX_CTL and retry */
        temp = I915_READ(DP_TP_CTL(PORT_E));
        temp &= ~(DP_TP_CTL_ENABLE | DP_TP_CTL_LINK_TRAIN_MASK);
        temp |= DP_TP_CTL_LINK_TRAIN_PAT1;
        I915_WRITE(DP_TP_CTL(PORT_E), temp);
        POSTING_READ(DP_TP_CTL(PORT_E));

        intel_wait_ddi_buf_idle(dev_priv, PORT_E);

        rx_ctl_val &= ~FDI_RX_ENABLE;
        I915_WRITE(_FDI_RXA_CTL, rx_ctl_val);
        POSTING_READ(_FDI_RXA_CTL);

        /* Reset FDI_RX_MISC pwrdn lanes */
        temp = I915_READ(_FDI_RXA_MISC);
        temp &= ~(FDI_RX_PWRDN_LANE1_MASK | FDI_RX_PWRDN_LANE0_MASK);
        temp |= FDI_RX_PWRDN_LANE1_VAL(2) | FDI_RX_PWRDN_LANE0_VAL(2);
        I915_WRITE(_FDI_RXA_MISC, temp);
        POSTING_READ(_FDI_RXA_MISC);
    }

    DRM_ERROR("FDI link training failed!\n");
}

static void intel_ddi_mode_set(struct drm_encoder *encoder,
                   struct drm_display_mode *mode,
                   struct drm_display_mode *adjusted_mode)
{
    struct drm_crtc *crtc = encoder->crtc;
    struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
    struct intel_encoder *intel_encoder = to_intel_encoder(encoder);
    int port = intel_ddi_get_encoder_port(intel_encoder);
    int pipe = intel_crtc->pipe;
    int type = intel_encoder->type;

    DRM_DEBUG_KMS("Preparing DDI mode on port %c, pipe %c\n",
              port_name(port), pipe_name(pipe));

    intel_crtc->eld_vld = false;
    if (type == INTEL_OUTPUT_DISPLAYPORT || type == INTEL_OUTPUT_EDP) {
        struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
        struct intel_digital_port *intel_dig_port =
            enc_to_dig_port(encoder);

        intel_dp->DP = intel_dig_port->saved_port_bits |
                   DDI_BUF_CTL_ENABLE | DDI_BUF_EMP_400MV_0DB_HSW;
        intel_dp->DP |= DDI_PORT_WIDTH(intel_dp->lane_count);

        if (intel_dp->has_audio) {
            DRM_DEBUG_DRIVER("DP audio on pipe %c on DDI\n",
                     pipe_name(intel_crtc->pipe));

            /* write eld */
            DRM_DEBUG_DRIVER("DP audio: write eld information\n");
            intel_write_eld(encoder, adjusted_mode);
        }

        intel_dp_init_link_config(intel_dp);

    } else if (type == INTEL_OUTPUT_HDMI) {
        struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(encoder);

        if (intel_hdmi->has_audio) {
            /* Proper support for digital audio needs a new logic
             * and a new set of registers, so we leave it for future
             * patch bombing.
             */
            DRM_DEBUG_DRIVER("HDMI audio on pipe %c on DDI\n",
                     pipe_name(intel_crtc->pipe));

            /* write eld */
            DRM_DEBUG_DRIVER("HDMI audio: write eld information\n");
            intel_write_eld(encoder, adjusted_mode);
        }

        intel_hdmi->set_infoframes(encoder, adjusted_mode);
    }
}

static struct intel_encoder *
intel_ddi_get_crtc_encoder(struct drm_crtc *crtc)
{
    struct drm_device *dev = crtc->dev;
    struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
    struct intel_encoder *intel_encoder, *ret = NULL;
    int num_encoders = 0;

    for_each_encoder_on_crtc(dev, crtc, intel_encoder) {
        ret = intel_encoder;
        num_encoders++;
    }

    if (num_encoders != 1) {
        DRM_ERROR("%d encoders on crtc for pipe %c\n", num_encoders,
             pipe_name(intel_crtc->pipe));
    }

    BUG_ON(ret == NULL);
    return ret;
}

void intel_ddi_put_crtc_pll(struct drm_crtc *crtc)
{
    struct drm_i915_private *dev_priv = crtc->dev->dev_private;
    struct intel_ddi_plls *plls = &dev_priv->ddi_plls;
    struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
    uint32_t val;

    switch (intel_crtc->ddi_pll_sel) {
    case PORT_CLK_SEL_SPLL:
        plls->spll_refcount--;
        if (plls->spll_refcount == 0) {
            DRM_DEBUG_KMS("Disabling SPLL\n");
            val = I915_READ(SPLL_CTL);
            WARN_ON(!(val & SPLL_PLL_ENABLE));
            I915_WRITE(SPLL_CTL, val & ~SPLL_PLL_ENABLE);
            POSTING_READ(SPLL_CTL);
        }
        break;
    case PORT_CLK_SEL_WRPLL1:
        plls->wrpll1_refcount--;
        if (plls->wrpll1_refcount == 0) {
            DRM_DEBUG_KMS("Disabling WRPLL 1\n");
            val = I915_READ(WRPLL_CTL1);
            WARN_ON(!(val & WRPLL_PLL_ENABLE));
            I915_WRITE(WRPLL_CTL1, val & ~WRPLL_PLL_ENABLE);
            POSTING_READ(WRPLL_CTL1);
        }
        break;
    case PORT_CLK_SEL_WRPLL2:
        plls->wrpll2_refcount--;
        if (plls->wrpll2_refcount == 0) {
            DRM_DEBUG_KMS("Disabling WRPLL 2\n");
            val = I915_READ(WRPLL_CTL2);
            WARN_ON(!(val & WRPLL_PLL_ENABLE));
            I915_WRITE(WRPLL_CTL2, val & ~WRPLL_PLL_ENABLE);
            POSTING_READ(WRPLL_CTL2);
        }
        break;
    }

    if(plls->spll_refcount < 0)
        DRM_ERROR("Invalid SPLL refcount\n");
    if(plls->wrpll1_refcount < 0)
        DRM_ERROR("Invalid WRPLL1 refcount\n");
    if(plls->wrpll2_refcount < 0)
        DRM_ERROR("Invalid WRPLL2 refcount\n");

    intel_crtc->ddi_pll_sel = PORT_CLK_SEL_NONE;
}

#define LC_FREQ 2700
#define LC_FREQ_2K (LC_FREQ * 2000)

#define P_MIN 2
#define P_MAX 64
#define P_INC 2

/* Constraints for PLL good behavior */
#define REF_MIN 48
#define REF_MAX 400
#define VCO_MIN 2400
#define VCO_MAX 4800

#define ABS_DIFF(a, b) ((a > b) ? (a - b) : (b - a))

struct wrpll_rnp {
    unsigned p, n2, r2;
};

static unsigned wrpll_get_budget_for_freq(int clock)
{
    unsigned budget;

    switch (clock) {
    case 25175000:
    case 25200000:
    case 27000000:
    case 27027000:
    case 37762500:
    case 37800000:
    case 40500000:
    case 40541000:
    case 54000000:
    case 54054000:
    case 59341000:
    case 59400000:
    case 72000000:
    case 74176000:
    case 74250000:
    case 81000000:
    case 81081000:
    case 89012000:
    case 89100000:
    case 108000000:
    case 108108000:
    case 111264000:
    case 111375000:
    case 148352000:
    case 148500000:
    case 162000000:
    case 162162000:
    case 222525000:
    case 222750000:
    case 296703000:
    case 297000000:
        budget = 0;
        break;
    case 233500000:
    case 245250000:
    case 247750000:
    case 253250000:
    case 298000000:
        budget = 1500;
        break;
    case 169128000:
    case 169500000:
    case 179500000:
    case 202000000:
        budget = 2000;
        break;
    case 256250000:
    case 262500000:
    case 270000000:
    case 272500000:
    case 273750000:
    case 280750000:
    case 281250000:
    case 286000000:
    case 291750000:
        budget = 4000;
        break;
    case 267250000:
    case 268500000:
        budget = 5000;
        break;
    default:
        budget = 1000;
        break;
    }

    return budget;
}

static void wrpll_update_rnp(uint64_t freq2k, unsigned budget,
                 unsigned r2, unsigned n2, unsigned p,
                 struct wrpll_rnp *best)
{
    uint64_t a, b, c, d, diff, diff_best;

    /* No best (r,n,p) yet */
    if (best->p == 0) {
        best->p = p;
        best->n2 = n2;
        best->r2 = r2;
        return;
    }

    /*
     * Output clock is (LC_FREQ_2K / 2000) * N / (P * R), which compares to
     * freq2k.
     *
     * delta = 1e6 *
     *     abs(freq2k - (LC_FREQ_2K * n2/(p * r2))) /
     *     freq2k;
     *
     * and we would like delta <= budget.
     *
     * If the discrepancy is above the PPM-based budget, always prefer to
     * improve upon the previous solution.  However, if you're within the
     * budget, try to maximize Ref * VCO, that is N / (P * R^2).
     */
    a = freq2k * budget * p * r2;
    b = freq2k * budget * best->p * best->r2;
    diff = ABS_DIFF((freq2k * p * r2), (LC_FREQ_2K * n2));
    diff_best = ABS_DIFF((freq2k * best->p * best->r2),
                 (LC_FREQ_2K * best->n2));
    c = 1000000 * diff;
    d = 1000000 * diff_best;

    if (a < c && b < d) {
        /* If both are above the budget, pick the closer */
        if (best->p * best->r2 * diff < p * r2 * diff_best) {
            best->p = p;
            best->n2 = n2;
            best->r2 = r2;
        }
    } else if (a >= c && b < d) {
        /* If A is below the threshold but B is above it?  Update. */
        best->p = p;
        best->n2 = n2;
        best->r2 = r2;
    } else if (a >= c && b >= d) {
        /* Both are below the limit, so pick the higher n2/(r2*r2) */
        if (n2 * best->r2 * best->r2 > best->n2 * r2 * r2) {
            best->p = p;
            best->n2 = n2;
            best->r2 = r2;
        }
    }
    /* Otherwise a < c && b >= d, do nothing */
}

static void
intel_ddi_calculate_wrpll(int clock /* in Hz */,
              unsigned *r2_out, unsigned *n2_out, unsigned *p_out)
{
    uint64_t freq2k;
    unsigned p, n2, r2;
    struct wrpll_rnp best = { 0, 0, 0 };
    unsigned budget;

    freq2k = clock / 100;

    budget = wrpll_get_budget_for_freq(clock);

    /* Special case handling for 540 pixel clock: bypass WR PLL entirely
     * and directly pass the LC PLL to it. */
    if (freq2k == 5400000) {
        *n2_out = 2;
        *p_out = 1;
        *r2_out = 2;
        return;
    }

    /*
     * Ref = LC_FREQ / R, where Ref is the actual reference input seen by
     * the WR PLL.
     *
     * We want R so that REF_MIN <= Ref <= REF_MAX.
     * Injecting R2 = 2 * R gives:
     *   REF_MAX * r2 > LC_FREQ * 2 and
     *   REF_MIN * r2 < LC_FREQ * 2
     *
     * Which means the desired boundaries for r2 are:
     *  LC_FREQ * 2 / REF_MAX < r2 < LC_FREQ * 2 / REF_MIN
     *
     */
    for (r2 = LC_FREQ * 2 / REF_MAX + 1;
         r2 <= LC_FREQ * 2 / REF_MIN;
         r2++) {

        /*
         * VCO = N * Ref, that is: VCO = N * LC_FREQ / R
         *
         * Once again we want VCO_MIN <= VCO <= VCO_MAX.
         * Injecting R2 = 2 * R and N2 = 2 * N, we get:
         *   VCO_MAX * r2 > n2 * LC_FREQ and
         *   VCO_MIN * r2 < n2 * LC_FREQ)
         *
         * Which means the desired boundaries for n2 are:
         * VCO_MIN * r2 / LC_FREQ < n2 < VCO_MAX * r2 / LC_FREQ
         */
        for (n2 = VCO_MIN * r2 / LC_FREQ + 1;
             n2 <= VCO_MAX * r2 / LC_FREQ;
             n2++) {

            for (p = P_MIN; p <= P_MAX; p += P_INC)
                wrpll_update_rnp(freq2k, budget,
                         r2, n2, p, &best);
        }
    }

    *n2_out = best.n2;
    *p_out = best.p;
    *r2_out = best.r2;

    DRM_DEBUG_KMS("WRPLL: %dHz refresh rate with p=%d, n2=%d r2=%d\n",
              clock, *p_out, *n2_out, *r2_out);
}

bool intel_ddi_pll_mode_set(struct drm_crtc *crtc)
{
    struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
    struct intel_encoder *intel_encoder = intel_ddi_get_crtc_encoder(crtc);
    struct drm_encoder *encoder = &intel_encoder->base;
    struct drm_i915_private *dev_priv = crtc->dev->dev_private;
    struct intel_ddi_plls *plls = &dev_priv->ddi_plls;
    int type = intel_encoder->type;
    enum pipe pipe = intel_crtc->pipe;
    uint32_t reg, val;
    int clock = intel_crtc->config.port_clock;

    /* TODO: reuse PLLs when possible (compare values) */

    intel_ddi_put_crtc_pll(crtc);

    if (type == INTEL_OUTPUT_DISPLAYPORT || type == INTEL_OUTPUT_EDP) {
        struct intel_dp *intel_dp = enc_to_intel_dp(encoder);

        switch (intel_dp->link_bw) {
        case DP_LINK_BW_1_62:
            intel_crtc->ddi_pll_sel = PORT_CLK_SEL_LCPLL_810;
            break;
        case DP_LINK_BW_2_7:
            intel_crtc->ddi_pll_sel = PORT_CLK_SEL_LCPLL_1350;
            break;
        case DP_LINK_BW_5_4:
            intel_crtc->ddi_pll_sel = PORT_CLK_SEL_LCPLL_2700;
            break;
        default:
            DRM_ERROR("Link bandwidth %d unsupported\n",
                  intel_dp->link_bw);
            return false;
        }

        /* We don't need to turn any PLL on because we'll use LCPLL. */
        return true;

    } else if (type == INTEL_OUTPUT_HDMI) {
        unsigned p, n2, r2;

        if (plls->wrpll1_refcount == 0) {
            DRM_DEBUG_KMS("Using WRPLL 1 on pipe %c\n",
                      pipe_name(pipe));
            plls->wrpll1_refcount++;
            reg = WRPLL_CTL1;
            intel_crtc->ddi_pll_sel = PORT_CLK_SEL_WRPLL1;
        } else if (plls->wrpll2_refcount == 0) {
            DRM_DEBUG_KMS("Using WRPLL 2 on pipe %c\n",
                      pipe_name(pipe));
            plls->wrpll2_refcount++;
            reg = WRPLL_CTL2;
            intel_crtc->ddi_pll_sel = PORT_CLK_SEL_WRPLL2;
        } else {
            DRM_ERROR("No WRPLLs available!\n");
            return false;
        }

        if(I915_READ(reg) & WRPLL_PLL_ENABLE)
            DRM_ERROR("WRPLL already enabled\n");

        intel_ddi_calculate_wrpll(clock * 1000, &r2, &n2, &p);

        val = WRPLL_PLL_ENABLE | WRPLL_PLL_SELECT_LCPLL_2700 |
              WRPLL_DIVIDER_REFERENCE(r2) | WRPLL_DIVIDER_FEEDBACK(n2) |
              WRPLL_DIVIDER_POST(p);

    } else if (type == INTEL_OUTPUT_ANALOG) {
        if (plls->spll_refcount == 0) {
            DRM_DEBUG_KMS("Using SPLL on pipe %c\n",
                      pipe_name(pipe));
            plls->spll_refcount++;
            reg = SPLL_CTL;
            intel_crtc->ddi_pll_sel = PORT_CLK_SEL_SPLL;
        } else {
            DRM_ERROR("SPLL already in use\n");
            return false;
        }

        if(I915_READ(reg) & SPLL_PLL_ENABLE)
            DRM_ERROR("SPLL already enabled\n");

        val = SPLL_PLL_ENABLE | SPLL_PLL_FREQ_1350MHz | SPLL_PLL_SSC;

    } else {
        DRM_ERROR("Invalid DDI encoder type %d\n", type);
        BUG_ON(1);
        return false;
    }

    I915_WRITE(reg, val);
    udelay(20);

    return true;
}

void intel_ddi_set_pipe_settings(struct drm_crtc *crtc)
{
    struct drm_i915_private *dev_priv = crtc->dev->dev_private;
    struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
    struct intel_encoder *intel_encoder = intel_ddi_get_crtc_encoder(crtc);
    enum transcoder cpu_transcoder = intel_crtc->config.cpu_transcoder;
    int type = intel_encoder->type;
    uint32_t temp;

    if (type == INTEL_OUTPUT_DISPLAYPORT || type == INTEL_OUTPUT_EDP) {

        temp = TRANS_MSA_SYNC_CLK;
        switch (intel_crtc->config.pipe_bpp) {
        case 18:
            temp |= TRANS_MSA_6_BPC;
            break;
        case 24:
            temp |= TRANS_MSA_8_BPC;
            break;
        case 30:
            temp |= TRANS_MSA_10_BPC;
            break;
        case 36:
            temp |= TRANS_MSA_12_BPC;
            break;
        default:
            BUG_ON(1);
        }
        I915_WRITE(TRANS_MSA_MISC(cpu_transcoder), temp);
    }
}

void intel_ddi_enable_transcoder_func(struct drm_crtc *crtc)
{
    struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
    struct intel_encoder *intel_encoder = intel_ddi_get_crtc_encoder(crtc);
    struct drm_encoder *encoder = &intel_encoder->base;
    struct drm_i915_private *dev_priv = crtc->dev->dev_private;
    enum pipe pipe = intel_crtc->pipe;
    enum transcoder cpu_transcoder = intel_crtc->config.cpu_transcoder;
    enum port port = intel_ddi_get_encoder_port(intel_encoder);
    int type = intel_encoder->type;
    uint32_t temp;

    /* Enable TRANS_DDI_FUNC_CTL for the pipe to work in HDMI mode */
    temp = TRANS_DDI_FUNC_ENABLE;
    temp |= TRANS_DDI_SELECT_PORT(port);

    switch (intel_crtc->config.pipe_bpp) {
    case 18:
        temp |= TRANS_DDI_BPC_6;
        break;
    case 24:
        temp |= TRANS_DDI_BPC_8;
        break;
    case 30:
        temp |= TRANS_DDI_BPC_10;
        break;
    case 36:
        temp |= TRANS_DDI_BPC_12;
        break;
    default:
        BUG_ON(1);
    }

    if (crtc->mode.flags & DRM_MODE_FLAG_PVSYNC)
        temp |= TRANS_DDI_PVSYNC;
    if (crtc->mode.flags & DRM_MODE_FLAG_PHSYNC)
        temp |= TRANS_DDI_PHSYNC;

    if (cpu_transcoder == TRANSCODER_EDP) {
        switch (pipe) {
        case PIPE_A:
            /* Can only use the always-on power well for eDP when
             * not using the panel fitter, and when not using motion
              * blur mitigation (which we don't support). */
            if (intel_crtc->config.pch_pfit.size)
                temp |= TRANS_DDI_EDP_INPUT_A_ONOFF;
            else
                temp |= TRANS_DDI_EDP_INPUT_A_ON;
            break;
        case PIPE_B:
            temp |= TRANS_DDI_EDP_INPUT_B_ONOFF;
            break;
        case PIPE_C:
            temp |= TRANS_DDI_EDP_INPUT_C_ONOFF;
            break;
        default:
            BUG();
            break;
        }
    }

    if (type == INTEL_OUTPUT_HDMI) {
        struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(encoder);

        if (intel_hdmi->has_hdmi_sink)
            temp |= TRANS_DDI_MODE_SELECT_HDMI;
        else
            temp |= TRANS_DDI_MODE_SELECT_DVI;

    } else if (type == INTEL_OUTPUT_ANALOG) {
        temp |= TRANS_DDI_MODE_SELECT_FDI;
        temp |= (intel_crtc->config.fdi_lanes - 1) << 1;
    } else if (type == INTEL_OUTPUT_DISPLAYPORT ||
           type == INTEL_OUTPUT_EDP) {
        struct intel_dp *intel_dp = enc_to_intel_dp(encoder);

        temp |= TRANS_DDI_MODE_SELECT_DP_SST;

        temp |= DDI_PORT_WIDTH(intel_dp->lane_count);
    } else {
        DRM_ERROR("Invalid encoder type %d for pipe %c\n",
             intel_encoder->type, pipe_name(pipe));
        BUG_ON(1);
    }

    I915_WRITE(TRANS_DDI_FUNC_CTL(cpu_transcoder), temp);
}

void intel_ddi_disable_transcoder_func(struct drm_i915_private *dev_priv,
                       enum transcoder cpu_transcoder)
{
    uint32_t reg = TRANS_DDI_FUNC_CTL(cpu_transcoder);
    uint32_t val = I915_READ(reg);

    val &= ~(TRANS_DDI_FUNC_ENABLE | TRANS_DDI_PORT_MASK);
    val |= TRANS_DDI_PORT_NONE;
    I915_WRITE(reg, val);
}

bool intel_ddi_connector_get_hw_state(struct intel_connector *intel_connector)
{
    struct drm_device *dev = intel_connector->base.dev;
    struct drm_i915_private *dev_priv = dev->dev_private;
    struct intel_encoder *intel_encoder = intel_connector->encoder;
    int type = intel_connector->base.connector_type;
    enum port port = intel_ddi_get_encoder_port(intel_encoder);
    enum pipe pipe = 0;
    enum transcoder cpu_transcoder;
    uint32_t tmp;

    if (!intel_encoder->get_hw_state(intel_encoder, &pipe))
        return false;

    if (port == PORT_A)
        cpu_transcoder = TRANSCODER_EDP;
    else
        cpu_transcoder = (enum transcoder)pipe;

    tmp = I915_READ(TRANS_DDI_FUNC_CTL(cpu_transcoder));

    switch (tmp & TRANS_DDI_MODE_SELECT_MASK) {
    case TRANS_DDI_MODE_SELECT_HDMI:
    case TRANS_DDI_MODE_SELECT_DVI:
        return (type == DRM_MODE_CONNECTOR_HDMIA);

    case TRANS_DDI_MODE_SELECT_DP_SST:
        if (type == DRM_MODE_CONNECTOR_eDP)
            return true;
    case TRANS_DDI_MODE_SELECT_DP_MST:
        return (type == DRM_MODE_CONNECTOR_DisplayPort);

    case TRANS_DDI_MODE_SELECT_FDI:
        return (type == DRM_MODE_CONNECTOR_VGA);

    default:
        return false;
    }
}

bool intel_ddi_get_hw_state(struct intel_encoder *encoder,
                enum pipe *pipe)
{
    struct drm_device *dev = encoder->base.dev;
    struct drm_i915_private *dev_priv = dev->dev_private;
    enum port port = intel_ddi_get_encoder_port(encoder);
    u32 tmp;
    int i;

    tmp = I915_READ(DDI_BUF_CTL(port));

    if (!(tmp & DDI_BUF_CTL_ENABLE))
        return false;

    if (port == PORT_A) {
        tmp = I915_READ(TRANS_DDI_FUNC_CTL(TRANSCODER_EDP));

        switch (tmp & TRANS_DDI_EDP_INPUT_MASK) {
        case TRANS_DDI_EDP_INPUT_A_ON:
        case TRANS_DDI_EDP_INPUT_A_ONOFF:
            *pipe = PIPE_A;
            break;
        case TRANS_DDI_EDP_INPUT_B_ONOFF:
            *pipe = PIPE_B;
            break;
        case TRANS_DDI_EDP_INPUT_C_ONOFF:
            *pipe = PIPE_C;
            break;
        }

        return true;
    } else {
        for (i = TRANSCODER_A; i <= TRANSCODER_C; i++) {
            tmp = I915_READ(TRANS_DDI_FUNC_CTL(i));

            if ((tmp & TRANS_DDI_PORT_MASK)
                == TRANS_DDI_SELECT_PORT(port)) {
                *pipe = i;
                return true;
            }
        }
    }

    DRM_DEBUG_KMS("No pipe for ddi port %c found\n", port_name(port));

    return false;
}

static uint32_t intel_ddi_get_crtc_pll(struct drm_i915_private *dev_priv,
                       enum pipe pipe)
{
    uint32_t temp, ret;
    enum port port = I915_MAX_PORTS;
    enum transcoder cpu_transcoder = intel_pipe_to_cpu_transcoder(dev_priv,
                                      pipe);
    int i;

    if (cpu_transcoder == TRANSCODER_EDP) {
        port = PORT_A;
    } else {
        temp = I915_READ(TRANS_DDI_FUNC_CTL(cpu_transcoder));
        temp &= TRANS_DDI_PORT_MASK;

        for (i = PORT_B; i <= PORT_E; i++)
            if (temp == TRANS_DDI_SELECT_PORT(i))
                port = i;
    }

    if (port == I915_MAX_PORTS) {
        DRM_ERROR("Pipe %c enabled on an unknown port\n",
             pipe_name(pipe));
        ret = PORT_CLK_SEL_NONE;
    } else {
        ret = I915_READ(PORT_CLK_SEL(port));
        DRM_DEBUG_KMS("Pipe %c connected to port %c using clock "
                  "0x%08x\n", pipe_name(pipe), port_name(port),
                  ret);
    }

    return ret;
}

void intel_ddi_setup_hw_pll_state(struct drm_device *dev)
{
    struct drm_i915_private *dev_priv = dev->dev_private;
    enum pipe pipe;
    struct intel_crtc *intel_crtc;

    for_each_pipe(pipe) {
        intel_crtc =
            to_intel_crtc(dev_priv->pipe_to_crtc_mapping[pipe]);

        if (!intel_crtc->active)
            continue;

        intel_crtc->ddi_pll_sel = intel_ddi_get_crtc_pll(dev_priv,
                                 pipe);

        switch (intel_crtc->ddi_pll_sel) {
        case PORT_CLK_SEL_SPLL:
            dev_priv->ddi_plls.spll_refcount++;
            break;
        case PORT_CLK_SEL_WRPLL1:
            dev_priv->ddi_plls.wrpll1_refcount++;
            break;
        case PORT_CLK_SEL_WRPLL2:
            dev_priv->ddi_plls.wrpll2_refcount++;
            break;
        }
    }
}

void intel_ddi_enable_pipe_clock(struct intel_crtc *intel_crtc)
{
    struct drm_crtc *crtc = &intel_crtc->base;
    struct drm_i915_private *dev_priv = crtc->dev->dev_private;
    struct intel_encoder *intel_encoder = intel_ddi_get_crtc_encoder(crtc);
    enum port port = intel_ddi_get_encoder_port(intel_encoder);
    enum transcoder cpu_transcoder = intel_crtc->config.cpu_transcoder;

    if (cpu_transcoder != TRANSCODER_EDP)
        I915_WRITE(TRANS_CLK_SEL(cpu_transcoder),
               TRANS_CLK_SEL_PORT(port));
}

void intel_ddi_disable_pipe_clock(struct intel_crtc *intel_crtc)
{
    struct drm_i915_private *dev_priv = intel_crtc->base.dev->dev_private;
    enum transcoder cpu_transcoder = intel_crtc->config.cpu_transcoder;

    if (cpu_transcoder != TRANSCODER_EDP)
        I915_WRITE(TRANS_CLK_SEL(cpu_transcoder),
               TRANS_CLK_SEL_DISABLED);
}

static void intel_ddi_pre_enable(struct intel_encoder *intel_encoder)
{
    struct drm_encoder *encoder = &intel_encoder->base;
    struct drm_crtc *crtc = encoder->crtc;
    struct drm_i915_private *dev_priv = encoder->dev->dev_private;
    struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
    enum port port = intel_ddi_get_encoder_port(intel_encoder);
    int type = intel_encoder->type;

    if (type == INTEL_OUTPUT_EDP) {
        struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
        ironlake_edp_panel_vdd_on(intel_dp);
        ironlake_edp_panel_on(intel_dp);
        ironlake_edp_panel_vdd_off(intel_dp, true);
    }

    WARN_ON(intel_crtc->ddi_pll_sel == PORT_CLK_SEL_NONE);
    I915_WRITE(PORT_CLK_SEL(port), intel_crtc->ddi_pll_sel);

    if (type == INTEL_OUTPUT_DISPLAYPORT || type == INTEL_OUTPUT_EDP) {
        struct intel_dp *intel_dp = enc_to_intel_dp(encoder);

        intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
        intel_dp_start_link_train(intel_dp);
        intel_dp_complete_link_train(intel_dp);
        if (port != PORT_A)
            intel_dp_stop_link_train(intel_dp);
    }
}

static void intel_ddi_post_disable(struct intel_encoder *intel_encoder)
{
    struct drm_encoder *encoder = &intel_encoder->base;
    struct drm_i915_private *dev_priv = encoder->dev->dev_private;
    enum port port = intel_ddi_get_encoder_port(intel_encoder);
    int type = intel_encoder->type;
    uint32_t val;
    bool wait = false;

    val = I915_READ(DDI_BUF_CTL(port));
    if (val & DDI_BUF_CTL_ENABLE) {
        val &= ~DDI_BUF_CTL_ENABLE;
        I915_WRITE(DDI_BUF_CTL(port), val);
        wait = true;
    }

    val = I915_READ(DP_TP_CTL(port));
    val &= ~(DP_TP_CTL_ENABLE | DP_TP_CTL_LINK_TRAIN_MASK);
    val |= DP_TP_CTL_LINK_TRAIN_PAT1;
    I915_WRITE(DP_TP_CTL(port), val);

    if (wait)
        intel_wait_ddi_buf_idle(dev_priv, port);

    if (type == INTEL_OUTPUT_EDP) {
        struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
        ironlake_edp_panel_vdd_on(intel_dp);
        ironlake_edp_panel_off(intel_dp);
    }

    I915_WRITE(PORT_CLK_SEL(port), PORT_CLK_SEL_NONE);
}

static void intel_enable_ddi(struct intel_encoder *intel_encoder)
{
    struct drm_encoder *encoder = &intel_encoder->base;
    struct drm_crtc *crtc = encoder->crtc;
    struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
    int pipe = intel_crtc->pipe;
    struct drm_device *dev = encoder->dev;
    struct drm_i915_private *dev_priv = dev->dev_private;
    enum port port = intel_ddi_get_encoder_port(intel_encoder);
    int type = intel_encoder->type;
    uint32_t tmp;

    if (type == INTEL_OUTPUT_HDMI) {
        struct intel_digital_port *intel_dig_port =
            enc_to_dig_port(encoder);

        /* In HDMI/DVI mode, the port width, and swing/emphasis values
         * are ignored so nothing special needs to be done besides
         * enabling the port.
         */
        I915_WRITE(DDI_BUF_CTL(port),
               intel_dig_port->saved_port_bits |
               DDI_BUF_CTL_ENABLE);
    } else if (type == INTEL_OUTPUT_EDP) {
        struct intel_dp *intel_dp = enc_to_intel_dp(encoder);

        if (port == PORT_A)
            intel_dp_stop_link_train(intel_dp);

        ironlake_edp_backlight_on(intel_dp);
    }

    if (intel_crtc->eld_vld && type != INTEL_OUTPUT_EDP) {
        tmp = I915_READ(HSW_AUD_PIN_ELD_CP_VLD);
        tmp |= ((AUDIO_OUTPUT_ENABLE_A | AUDIO_ELD_VALID_A) << (pipe * 4));
        I915_WRITE(HSW_AUD_PIN_ELD_CP_VLD, tmp);
    }
}

static void intel_disable_ddi(struct intel_encoder *intel_encoder)
{
    struct drm_encoder *encoder = &intel_encoder->base;
    struct drm_crtc *crtc = encoder->crtc;
    struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
    int pipe = intel_crtc->pipe;
    int type = intel_encoder->type;
    struct drm_device *dev = encoder->dev;
    struct drm_i915_private *dev_priv = dev->dev_private;
    uint32_t tmp;

    if (intel_crtc->eld_vld && type != INTEL_OUTPUT_EDP) {
        tmp = I915_READ(HSW_AUD_PIN_ELD_CP_VLD);
        tmp &= ~((AUDIO_OUTPUT_ENABLE_A | AUDIO_ELD_VALID_A) <<
             (pipe * 4));
        I915_WRITE(HSW_AUD_PIN_ELD_CP_VLD, tmp);
    }

    if (type == INTEL_OUTPUT_EDP) {
        struct intel_dp *intel_dp = enc_to_intel_dp(encoder);

        ironlake_edp_backlight_off(intel_dp);
    }
}

int intel_ddi_get_cdclk_freq(struct drm_i915_private *dev_priv)
{
    if (I915_READ(HSW_FUSE_STRAP) & HSW_CDCLK_LIMIT)
        return 450000;
    else if ((I915_READ(LCPLL_CTL) & LCPLL_CLK_FREQ_MASK) ==
         LCPLL_CLK_FREQ_450)
        return 450000;
    else if (IS_ULT(dev_priv->dev))
        return 337500;
    else
        return 540000;
}

void intel_ddi_pll_init(struct drm_device *dev)
{
    struct drm_i915_private *dev_priv = dev->dev_private;
    uint32_t val = I915_READ(LCPLL_CTL);

    /* The LCPLL register should be turned on by the BIOS. For now let's
     * just check its state and print errors in case something is wrong.
     * Don't even try to turn it on.
     */

    DRM_DEBUG_KMS("CDCLK running at %dKHz\n",
              intel_ddi_get_cdclk_freq(dev_priv));

    if (val & LCPLL_CD_SOURCE_FCLK)
        DRM_ERROR("CDCLK source is not LCPLL\n");

    if (val & LCPLL_PLL_DISABLE)
        DRM_ERROR("LCPLL is disabled\n");
}

void intel_ddi_prepare_link_retrain(struct drm_encoder *encoder)
{
    struct intel_digital_port *intel_dig_port = enc_to_dig_port(encoder);
    struct intel_dp *intel_dp = &intel_dig_port->dp;
    struct drm_i915_private *dev_priv = encoder->dev->dev_private;
    enum port port = intel_dig_port->port;
    uint32_t val;
    bool wait = false;

    if (I915_READ(DP_TP_CTL(port)) & DP_TP_CTL_ENABLE) {
        val = I915_READ(DDI_BUF_CTL(port));
        if (val & DDI_BUF_CTL_ENABLE) {
            val &= ~DDI_BUF_CTL_ENABLE;
            I915_WRITE(DDI_BUF_CTL(port), val);
            wait = true;
        }

        val = I915_READ(DP_TP_CTL(port));
        val &= ~(DP_TP_CTL_ENABLE | DP_TP_CTL_LINK_TRAIN_MASK);
        val |= DP_TP_CTL_LINK_TRAIN_PAT1;
        I915_WRITE(DP_TP_CTL(port), val);
        POSTING_READ(DP_TP_CTL(port));

        if (wait)
            intel_wait_ddi_buf_idle(dev_priv, port);
    }

    val = DP_TP_CTL_ENABLE | DP_TP_CTL_MODE_SST |
          DP_TP_CTL_LINK_TRAIN_PAT1 | DP_TP_CTL_SCRAMBLE_DISABLE;
    if (intel_dp->link_configuration[1] & DP_LANE_COUNT_ENHANCED_FRAME_EN)
        val |= DP_TP_CTL_ENHANCED_FRAME_ENABLE;
    I915_WRITE(DP_TP_CTL(port), val);
    POSTING_READ(DP_TP_CTL(port));

    intel_dp->DP |= DDI_BUF_CTL_ENABLE;
    I915_WRITE(DDI_BUF_CTL(port), intel_dp->DP);
    POSTING_READ(DDI_BUF_CTL(port));

    udelay(600);
}

void intel_ddi_fdi_disable(struct drm_crtc *crtc)
{
    struct drm_i915_private *dev_priv = crtc->dev->dev_private;
    struct intel_encoder *intel_encoder = intel_ddi_get_crtc_encoder(crtc);
    uint32_t val;

    intel_ddi_post_disable(intel_encoder);

    val = I915_READ(_FDI_RXA_CTL);
    val &= ~FDI_RX_ENABLE;
    I915_WRITE(_FDI_RXA_CTL, val);

    val = I915_READ(_FDI_RXA_MISC);
    val &= ~(FDI_RX_PWRDN_LANE1_MASK | FDI_RX_PWRDN_LANE0_MASK);
    val |= FDI_RX_PWRDN_LANE1_VAL(2) | FDI_RX_PWRDN_LANE0_VAL(2);
    I915_WRITE(_FDI_RXA_MISC, val);

    val = I915_READ(_FDI_RXA_CTL);
    val &= ~FDI_PCDCLK;
    I915_WRITE(_FDI_RXA_CTL, val);

    val = I915_READ(_FDI_RXA_CTL);
    val &= ~FDI_RX_PLL_ENABLE;
    I915_WRITE(_FDI_RXA_CTL, val);
}

static void intel_ddi_hot_plug(struct intel_encoder *intel_encoder)
{
    struct intel_dp *intel_dp = enc_to_intel_dp(&intel_encoder->base);
    int type = intel_encoder->type;

    if (type == INTEL_OUTPUT_DISPLAYPORT || type == INTEL_OUTPUT_EDP)
        intel_dp_check_link_status(intel_dp);
}

static void intel_ddi_get_config(struct intel_encoder *encoder,
                 struct intel_crtc_config *pipe_config)
{
    struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
    struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
    enum transcoder cpu_transcoder = intel_crtc->config.cpu_transcoder;
    u32 temp, flags = 0;

    temp = I915_READ(TRANS_DDI_FUNC_CTL(cpu_transcoder));
    if (temp & TRANS_DDI_PHSYNC)
        flags |= DRM_MODE_FLAG_PHSYNC;
    else
        flags |= DRM_MODE_FLAG_NHSYNC;
    if (temp & TRANS_DDI_PVSYNC)
        flags |= DRM_MODE_FLAG_PVSYNC;
    else
        flags |= DRM_MODE_FLAG_NVSYNC;

    pipe_config->adjusted_mode.flags |= flags;
}

static void intel_ddi_destroy(struct drm_encoder *encoder)
{
    /* HDMI has nothing special to destroy, so we can go with this. */
    intel_dp_encoder_destroy(encoder);
}

static bool intel_ddi_compute_config(struct intel_encoder *encoder,
                     struct intel_crtc_config *pipe_config)
{
    int type = encoder->type;
    int port = intel_ddi_get_encoder_port(encoder);

    if(type == INTEL_OUTPUT_UNKNOWN)
        DRM_ERROR("mode_fixup() on unknown output!");

    if (port == PORT_A)
        pipe_config->cpu_transcoder = TRANSCODER_EDP;

    if (type == INTEL_OUTPUT_HDMI)
        return intel_hdmi_compute_config(encoder, pipe_config);
    else
        return intel_dp_compute_config(encoder, pipe_config);
}

static const struct drm_encoder_funcs intel_ddi_funcs = {
    .destroy = intel_ddi_destroy,
};

static const struct drm_encoder_helper_funcs intel_ddi_helper_funcs = {
    .mode_set = intel_ddi_mode_set,
};

void intel_ddi_init(struct drm_device *dev, enum port port)
{
    struct drm_i915_private *dev_priv = dev->dev_private;
    struct intel_digital_port *intel_dig_port;
    struct intel_encoder *intel_encoder;
    struct drm_encoder *encoder;
    struct intel_connector *hdmi_connector = NULL;
    struct intel_connector *dp_connector = NULL;

    intel_dig_port = kzalloc(sizeof(struct intel_digital_port), GFP_KERNEL);
    if (!intel_dig_port)
        return;

    dp_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
    if (!dp_connector) {
        kfree(intel_dig_port, sizeof(struct intel_digital_port));

        return;
    }

    intel_encoder = &intel_dig_port->base;
    encoder = &intel_encoder->base;

    drm_encoder_init(dev, encoder, &intel_ddi_funcs,
             DRM_MODE_ENCODER_TMDS);
    drm_encoder_helper_add(encoder, &intel_ddi_helper_funcs);

    intel_encoder->compute_config = intel_ddi_compute_config;
    intel_encoder->enable = intel_enable_ddi;
    intel_encoder->pre_enable = intel_ddi_pre_enable;
    intel_encoder->disable = intel_disable_ddi;
    intel_encoder->post_disable = intel_ddi_post_disable;
    intel_encoder->get_hw_state = intel_ddi_get_hw_state;
    intel_encoder->get_config = intel_ddi_get_config;

    intel_dig_port->port = port;
    intel_dig_port->saved_port_bits = I915_READ(DDI_BUF_CTL(port)) &
                      (DDI_BUF_PORT_REVERSAL |
                       DDI_A_4_LANES);
    intel_dig_port->dp.output_reg = DDI_BUF_CTL(port);

    intel_encoder->type = INTEL_OUTPUT_UNKNOWN;
    intel_encoder->crtc_mask =  (1 << 0) | (1 << 1) | (1 << 2);
    intel_encoder->cloneable = false;
    intel_encoder->hot_plug = intel_ddi_hot_plug;

    if (!intel_dp_init_connector(intel_dig_port, dp_connector)) {
        drm_encoder_cleanup(encoder);
        kfree(intel_dig_port, sizeof(struct intel_digital_port));
        kfree(dp_connector, sizeof(struct intel_connector));
        return;
    }

    if (intel_encoder->type != INTEL_OUTPUT_EDP) {
        hdmi_connector = kzalloc(sizeof(struct intel_connector),
                     GFP_KERNEL);
        if (!hdmi_connector) {
            return;
        }

        intel_dig_port->hdmi.hdmi_reg = DDI_BUF_CTL(port);
        intel_hdmi_init_connector(intel_dig_port, hdmi_connector);
    }
}