Merge tag 'drm-intel-next-2019-05-24' of git://anongit.freedesktop.org/drm/drm-intel...

[mirror_ubuntu-kernels.git] / drivers / gpu / drm / i915 / intel_hdmi.c

/*
 * Copyright 2006 Dave Airlie <airlied@linux.ie>
 * Copyright © 2006-2009 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * Authors:
 *      Eric Anholt <eric@anholt.net>
 *      Jesse Barnes <jesse.barnes@intel.com>
 */

#include <linux/delay.h>
#include <linux/hdmi.h>
#include <linux/i2c.h>
#include <linux/slab.h>

#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
#include <drm/drm_edid.h>
#include <drm/drm_hdcp.h>
#include <drm/drm_scdc_helper.h>
#include <drm/i915_drm.h>
#include <drm/intel_lpe_audio.h>

#include "i915_debugfs.h"
#include "i915_drv.h"
#include "intel_atomic.h"
#include "intel_audio.h"
#include "intel_connector.h"
#include "intel_ddi.h"
#include "intel_dp.h"
#include "intel_dpio_phy.h"
#include "intel_drv.h"
#include "intel_fifo_underrun.h"
#include "intel_gmbus.h"
#include "intel_hdcp.h"
#include "intel_hdmi.h"
#include "intel_hotplug.h"
#include "intel_lspcon.h"
#include "intel_sdvo.h"
#include "intel_panel.h"
#include "intel_sideband.h"

static struct drm_device *intel_hdmi_to_dev(struct intel_hdmi *intel_hdmi)
{
        return hdmi_to_dig_port(intel_hdmi)->base.base.dev;
}

static void
assert_hdmi_port_disabled(struct intel_hdmi *intel_hdmi)
{
        struct drm_device *dev = intel_hdmi_to_dev(intel_hdmi);
        struct drm_i915_private *dev_priv = to_i915(dev);
        u32 enabled_bits;

        enabled_bits = HAS_DDI(dev_priv) ? DDI_BUF_CTL_ENABLE : SDVO_ENABLE;

        WARN(I915_READ(intel_hdmi->hdmi_reg) & enabled_bits,
             "HDMI port enabled, expecting disabled\n");
}

static void
assert_hdmi_transcoder_func_disabled(struct drm_i915_private *dev_priv,
                                     enum transcoder cpu_transcoder)
{
        WARN(I915_READ(TRANS_DDI_FUNC_CTL(cpu_transcoder)) &
             TRANS_DDI_FUNC_ENABLE,
             "HDMI transcoder function enabled, expecting disabled\n");
}

struct intel_hdmi *enc_to_intel_hdmi(struct drm_encoder *encoder)
{
        struct intel_digital_port *intel_dig_port =
                container_of(encoder, struct intel_digital_port, base.base);
        return &intel_dig_port->hdmi;
}

static struct intel_hdmi *intel_attached_hdmi(struct drm_connector *connector)
{
        return enc_to_intel_hdmi(&intel_attached_encoder(connector)->base);
}

static u32 g4x_infoframe_index(unsigned int type)
{
        switch (type) {
        case HDMI_PACKET_TYPE_GAMUT_METADATA:
                return VIDEO_DIP_SELECT_GAMUT;
        case HDMI_INFOFRAME_TYPE_AVI:
                return VIDEO_DIP_SELECT_AVI;
        case HDMI_INFOFRAME_TYPE_SPD:
                return VIDEO_DIP_SELECT_SPD;
        case HDMI_INFOFRAME_TYPE_VENDOR:
                return VIDEO_DIP_SELECT_VENDOR;
        default:
                MISSING_CASE(type);
                return 0;
        }
}

static u32 g4x_infoframe_enable(unsigned int type)
{
        switch (type) {
        case HDMI_PACKET_TYPE_GENERAL_CONTROL:
                return VIDEO_DIP_ENABLE_GCP;
        case HDMI_PACKET_TYPE_GAMUT_METADATA:
                return VIDEO_DIP_ENABLE_GAMUT;
        case DP_SDP_VSC:
                return 0;
        case HDMI_INFOFRAME_TYPE_AVI:
                return VIDEO_DIP_ENABLE_AVI;
        case HDMI_INFOFRAME_TYPE_SPD:
                return VIDEO_DIP_ENABLE_SPD;
        case HDMI_INFOFRAME_TYPE_VENDOR:
                return VIDEO_DIP_ENABLE_VENDOR;
        default:
                MISSING_CASE(type);
                return 0;
        }
}

static u32 hsw_infoframe_enable(unsigned int type)
{
        switch (type) {
        case HDMI_PACKET_TYPE_GENERAL_CONTROL:
                return VIDEO_DIP_ENABLE_GCP_HSW;
        case HDMI_PACKET_TYPE_GAMUT_METADATA:
                return VIDEO_DIP_ENABLE_GMP_HSW;
        case DP_SDP_VSC:
                return VIDEO_DIP_ENABLE_VSC_HSW;
        case DP_SDP_PPS:
                return VDIP_ENABLE_PPS;
        case HDMI_INFOFRAME_TYPE_AVI:
                return VIDEO_DIP_ENABLE_AVI_HSW;
        case HDMI_INFOFRAME_TYPE_SPD:
                return VIDEO_DIP_ENABLE_SPD_HSW;
        case HDMI_INFOFRAME_TYPE_VENDOR:
                return VIDEO_DIP_ENABLE_VS_HSW;
        default:
                MISSING_CASE(type);
                return 0;
        }
}

static i915_reg_t
hsw_dip_data_reg(struct drm_i915_private *dev_priv,
                 enum transcoder cpu_transcoder,
                 unsigned int type,
                 int i)
{
        switch (type) {
        case HDMI_PACKET_TYPE_GAMUT_METADATA:
                return HSW_TVIDEO_DIP_GMP_DATA(cpu_transcoder, i);
        case DP_SDP_VSC:
                return HSW_TVIDEO_DIP_VSC_DATA(cpu_transcoder, i);
        case DP_SDP_PPS:
                return ICL_VIDEO_DIP_PPS_DATA(cpu_transcoder, i);
        case HDMI_INFOFRAME_TYPE_AVI:
                return HSW_TVIDEO_DIP_AVI_DATA(cpu_transcoder, i);
        case HDMI_INFOFRAME_TYPE_SPD:
                return HSW_TVIDEO_DIP_SPD_DATA(cpu_transcoder, i);
        case HDMI_INFOFRAME_TYPE_VENDOR:
                return HSW_TVIDEO_DIP_VS_DATA(cpu_transcoder, i);
        default:
                MISSING_CASE(type);
                return INVALID_MMIO_REG;
        }
}

static int hsw_dip_data_size(unsigned int type)
{
        switch (type) {
        case DP_SDP_VSC:
                return VIDEO_DIP_VSC_DATA_SIZE;
        case DP_SDP_PPS:
                return VIDEO_DIP_PPS_DATA_SIZE;
        default:
                return VIDEO_DIP_DATA_SIZE;
        }
}

static void g4x_write_infoframe(struct intel_encoder *encoder,
                                const struct intel_crtc_state *crtc_state,
                                unsigned int type,
                                const void *frame, ssize_t len)
{
        const u32 *data = frame;
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        u32 val = I915_READ(VIDEO_DIP_CTL);
        int i;

        WARN(!(val & VIDEO_DIP_ENABLE), "Writing DIP with CTL reg disabled\n");

        val &= ~(VIDEO_DIP_SELECT_MASK | 0xf); /* clear DIP data offset */
        val |= g4x_infoframe_index(type);

        val &= ~g4x_infoframe_enable(type);

        I915_WRITE(VIDEO_DIP_CTL, val);

        for (i = 0; i < len; i += 4) {
                I915_WRITE(VIDEO_DIP_DATA, *data);
                data++;
        }
        /* Write every possible data byte to force correct ECC calculation. */
        for (; i < VIDEO_DIP_DATA_SIZE; i += 4)
                I915_WRITE(VIDEO_DIP_DATA, 0);

        val |= g4x_infoframe_enable(type);
        val &= ~VIDEO_DIP_FREQ_MASK;
        val |= VIDEO_DIP_FREQ_VSYNC;

        I915_WRITE(VIDEO_DIP_CTL, val);
        POSTING_READ(VIDEO_DIP_CTL);
}

static void g4x_read_infoframe(struct intel_encoder *encoder,
                               const struct intel_crtc_state *crtc_state,
                               unsigned int type,
                               void *frame, ssize_t len)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        u32 val, *data = frame;
        int i;

        val = I915_READ(VIDEO_DIP_CTL);

        val &= ~(VIDEO_DIP_SELECT_MASK | 0xf); /* clear DIP data offset */
        val |= g4x_infoframe_index(type);

        I915_WRITE(VIDEO_DIP_CTL, val);

        for (i = 0; i < len; i += 4)
                *data++ = I915_READ(VIDEO_DIP_DATA);
}

static u32 g4x_infoframes_enabled(struct intel_encoder *encoder,
                                  const struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        u32 val = I915_READ(VIDEO_DIP_CTL);

        if ((val & VIDEO_DIP_ENABLE) == 0)
                return 0;

        if ((val & VIDEO_DIP_PORT_MASK) != VIDEO_DIP_PORT(encoder->port))
                return 0;

        return val & (VIDEO_DIP_ENABLE_AVI |
                      VIDEO_DIP_ENABLE_VENDOR | VIDEO_DIP_ENABLE_SPD);
}

static void ibx_write_infoframe(struct intel_encoder *encoder,
                                const struct intel_crtc_state *crtc_state,
                                unsigned int type,
                                const void *frame, ssize_t len)
{
        const u32 *data = frame;
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc_state->base.crtc);
        i915_reg_t reg = TVIDEO_DIP_CTL(intel_crtc->pipe);
        u32 val = I915_READ(reg);
        int i;

        WARN(!(val & VIDEO_DIP_ENABLE), "Writing DIP with CTL reg disabled\n");

        val &= ~(VIDEO_DIP_SELECT_MASK | 0xf); /* clear DIP data offset */
        val |= g4x_infoframe_index(type);

        val &= ~g4x_infoframe_enable(type);

        I915_WRITE(reg, val);

        for (i = 0; i < len; i += 4) {
                I915_WRITE(TVIDEO_DIP_DATA(intel_crtc->pipe), *data);
                data++;
        }
        /* Write every possible data byte to force correct ECC calculation. */
        for (; i < VIDEO_DIP_DATA_SIZE; i += 4)
                I915_WRITE(TVIDEO_DIP_DATA(intel_crtc->pipe), 0);

        val |= g4x_infoframe_enable(type);
        val &= ~VIDEO_DIP_FREQ_MASK;
        val |= VIDEO_DIP_FREQ_VSYNC;

        I915_WRITE(reg, val);
        POSTING_READ(reg);
}

static void ibx_read_infoframe(struct intel_encoder *encoder,
                               const struct intel_crtc_state *crtc_state,
                               unsigned int type,
                               void *frame, ssize_t len)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
        u32 val, *data = frame;
        int i;

        val = I915_READ(TVIDEO_DIP_CTL(crtc->pipe));

        val &= ~(VIDEO_DIP_SELECT_MASK | 0xf); /* clear DIP data offset */
        val |= g4x_infoframe_index(type);

        I915_WRITE(TVIDEO_DIP_CTL(crtc->pipe), val);

        for (i = 0; i < len; i += 4)
                *data++ = I915_READ(TVIDEO_DIP_DATA(crtc->pipe));
}

static u32 ibx_infoframes_enabled(struct intel_encoder *encoder,
                                  const struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        enum pipe pipe = to_intel_crtc(pipe_config->base.crtc)->pipe;
        i915_reg_t reg = TVIDEO_DIP_CTL(pipe);
        u32 val = I915_READ(reg);

        if ((val & VIDEO_DIP_ENABLE) == 0)
                return 0;

        if ((val & VIDEO_DIP_PORT_MASK) != VIDEO_DIP_PORT(encoder->port))
                return 0;

        return val & (VIDEO_DIP_ENABLE_AVI |
                      VIDEO_DIP_ENABLE_VENDOR | VIDEO_DIP_ENABLE_GAMUT |
                      VIDEO_DIP_ENABLE_SPD | VIDEO_DIP_ENABLE_GCP);
}

static void cpt_write_infoframe(struct intel_encoder *encoder,
                                const struct intel_crtc_state *crtc_state,
                                unsigned int type,
                                const void *frame, ssize_t len)
{
        const u32 *data = frame;
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc_state->base.crtc);
        i915_reg_t reg = TVIDEO_DIP_CTL(intel_crtc->pipe);
        u32 val = I915_READ(reg);
        int i;

        WARN(!(val & VIDEO_DIP_ENABLE), "Writing DIP with CTL reg disabled\n");

        val &= ~(VIDEO_DIP_SELECT_MASK | 0xf); /* clear DIP data offset */
        val |= g4x_infoframe_index(type);

        /* The DIP control register spec says that we need to update the AVI
         * infoframe without clearing its enable bit */
        if (type != HDMI_INFOFRAME_TYPE_AVI)
                val &= ~g4x_infoframe_enable(type);

        I915_WRITE(reg, val);

        for (i = 0; i < len; i += 4) {
                I915_WRITE(TVIDEO_DIP_DATA(intel_crtc->pipe), *data);
                data++;
        }
        /* Write every possible data byte to force correct ECC calculation. */
        for (; i < VIDEO_DIP_DATA_SIZE; i += 4)
                I915_WRITE(TVIDEO_DIP_DATA(intel_crtc->pipe), 0);

        val |= g4x_infoframe_enable(type);
        val &= ~VIDEO_DIP_FREQ_MASK;
        val |= VIDEO_DIP_FREQ_VSYNC;

        I915_WRITE(reg, val);
        POSTING_READ(reg);
}

static void cpt_read_infoframe(struct intel_encoder *encoder,
                               const struct intel_crtc_state *crtc_state,
                               unsigned int type,
                               void *frame, ssize_t len)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
        u32 val, *data = frame;
        int i;

        val = I915_READ(TVIDEO_DIP_CTL(crtc->pipe));

        val &= ~(VIDEO_DIP_SELECT_MASK | 0xf); /* clear DIP data offset */
        val |= g4x_infoframe_index(type);

        I915_WRITE(TVIDEO_DIP_CTL(crtc->pipe), val);

        for (i = 0; i < len; i += 4)
                *data++ = I915_READ(TVIDEO_DIP_DATA(crtc->pipe));
}

static u32 cpt_infoframes_enabled(struct intel_encoder *encoder,
                                  const struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        enum pipe pipe = to_intel_crtc(pipe_config->base.crtc)->pipe;
        u32 val = I915_READ(TVIDEO_DIP_CTL(pipe));

        if ((val & VIDEO_DIP_ENABLE) == 0)
                return 0;

        return val & (VIDEO_DIP_ENABLE_AVI |
                      VIDEO_DIP_ENABLE_VENDOR | VIDEO_DIP_ENABLE_GAMUT |
                      VIDEO_DIP_ENABLE_SPD | VIDEO_DIP_ENABLE_GCP);
}

static void vlv_write_infoframe(struct intel_encoder *encoder,
                                const struct intel_crtc_state *crtc_state,
                                unsigned int type,
                                const void *frame, ssize_t len)
{
        const u32 *data = frame;
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc_state->base.crtc);
        i915_reg_t reg = VLV_TVIDEO_DIP_CTL(intel_crtc->pipe);
        u32 val = I915_READ(reg);
        int i;

        WARN(!(val & VIDEO_DIP_ENABLE), "Writing DIP with CTL reg disabled\n");

        val &= ~(VIDEO_DIP_SELECT_MASK | 0xf); /* clear DIP data offset */
        val |= g4x_infoframe_index(type);

        val &= ~g4x_infoframe_enable(type);

        I915_WRITE(reg, val);

        for (i = 0; i < len; i += 4) {
                I915_WRITE(VLV_TVIDEO_DIP_DATA(intel_crtc->pipe), *data);
                data++;
        }
        /* Write every possible data byte to force correct ECC calculation. */
        for (; i < VIDEO_DIP_DATA_SIZE; i += 4)
                I915_WRITE(VLV_TVIDEO_DIP_DATA(intel_crtc->pipe), 0);

        val |= g4x_infoframe_enable(type);
        val &= ~VIDEO_DIP_FREQ_MASK;
        val |= VIDEO_DIP_FREQ_VSYNC;

        I915_WRITE(reg, val);
        POSTING_READ(reg);
}

static void vlv_read_infoframe(struct intel_encoder *encoder,
                               const struct intel_crtc_state *crtc_state,
                               unsigned int type,
                               void *frame, ssize_t len)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
        u32 val, *data = frame;
        int i;

        val = I915_READ(VLV_TVIDEO_DIP_CTL(crtc->pipe));

        val &= ~(VIDEO_DIP_SELECT_MASK | 0xf); /* clear DIP data offset */
        val |= g4x_infoframe_index(type);

        I915_WRITE(VLV_TVIDEO_DIP_CTL(crtc->pipe), val);

        for (i = 0; i < len; i += 4)
                *data++ = I915_READ(VLV_TVIDEO_DIP_DATA(crtc->pipe));
}

static u32 vlv_infoframes_enabled(struct intel_encoder *encoder,
                                  const struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        enum pipe pipe = to_intel_crtc(pipe_config->base.crtc)->pipe;
        u32 val = I915_READ(VLV_TVIDEO_DIP_CTL(pipe));

        if ((val & VIDEO_DIP_ENABLE) == 0)
                return 0;

        if ((val & VIDEO_DIP_PORT_MASK) != VIDEO_DIP_PORT(encoder->port))
                return 0;

        return val & (VIDEO_DIP_ENABLE_AVI |
                      VIDEO_DIP_ENABLE_VENDOR | VIDEO_DIP_ENABLE_GAMUT |
                      VIDEO_DIP_ENABLE_SPD | VIDEO_DIP_ENABLE_GCP);
}

static void hsw_write_infoframe(struct intel_encoder *encoder,
                                const struct intel_crtc_state *crtc_state,
                                unsigned int type,
                                const void *frame, ssize_t len)
{
        const u32 *data = frame;
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
        i915_reg_t ctl_reg = HSW_TVIDEO_DIP_CTL(cpu_transcoder);
        int data_size;
        int i;
        u32 val = I915_READ(ctl_reg);

        data_size = hsw_dip_data_size(type);

        val &= ~hsw_infoframe_enable(type);
        I915_WRITE(ctl_reg, val);

        for (i = 0; i < len; i += 4) {
                I915_WRITE(hsw_dip_data_reg(dev_priv, cpu_transcoder,
                                            type, i >> 2), *data);
                data++;
        }
        /* Write every possible data byte to force correct ECC calculation. */
        for (; i < data_size; i += 4)
                I915_WRITE(hsw_dip_data_reg(dev_priv, cpu_transcoder,
                                            type, i >> 2), 0);

        val |= hsw_infoframe_enable(type);
        I915_WRITE(ctl_reg, val);
        POSTING_READ(ctl_reg);
}

static void hsw_read_infoframe(struct intel_encoder *encoder,
                               const struct intel_crtc_state *crtc_state,
                               unsigned int type,
                               void *frame, ssize_t len)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
        u32 val, *data = frame;
        int i;

        val = I915_READ(HSW_TVIDEO_DIP_CTL(cpu_transcoder));

        for (i = 0; i < len; i += 4)
                *data++ = I915_READ(hsw_dip_data_reg(dev_priv, cpu_transcoder,
                                                     type, i >> 2));
}

static u32 hsw_infoframes_enabled(struct intel_encoder *encoder,
                                  const struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        u32 val = I915_READ(HSW_TVIDEO_DIP_CTL(pipe_config->cpu_transcoder));

        return val & (VIDEO_DIP_ENABLE_VSC_HSW | VIDEO_DIP_ENABLE_AVI_HSW |
                      VIDEO_DIP_ENABLE_GCP_HSW | VIDEO_DIP_ENABLE_VS_HSW |
                      VIDEO_DIP_ENABLE_GMP_HSW | VIDEO_DIP_ENABLE_SPD_HSW);
}

static const u8 infoframe_type_to_idx[] = {
        HDMI_PACKET_TYPE_GENERAL_CONTROL,
        HDMI_PACKET_TYPE_GAMUT_METADATA,
        DP_SDP_VSC,
        HDMI_INFOFRAME_TYPE_AVI,
        HDMI_INFOFRAME_TYPE_SPD,
        HDMI_INFOFRAME_TYPE_VENDOR,
};

u32 intel_hdmi_infoframe_enable(unsigned int type)
{
        int i;

        for (i = 0; i < ARRAY_SIZE(infoframe_type_to_idx); i++) {
                if (infoframe_type_to_idx[i] == type)
                        return BIT(i);
        }

        return 0;
}

u32 intel_hdmi_infoframes_enabled(struct intel_encoder *encoder,
                                  const struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_digital_port *dig_port = enc_to_dig_port(&encoder->base);
        u32 val, ret = 0;
        int i;

        val = dig_port->infoframes_enabled(encoder, crtc_state);

        /* map from hardware bits to dip idx */
        for (i = 0; i < ARRAY_SIZE(infoframe_type_to_idx); i++) {
                unsigned int type = infoframe_type_to_idx[i];

                if (HAS_DDI(dev_priv)) {
                        if (val & hsw_infoframe_enable(type))
                                ret |= BIT(i);
                } else {
                        if (val & g4x_infoframe_enable(type))
                                ret |= BIT(i);
                }
        }

        return ret;
}

/*
 * The data we write to the DIP data buffer registers is 1 byte bigger than the
 * HDMI infoframe size because of an ECC/reserved byte at position 3 (starting
 * at 0). It's also a byte used by DisplayPort so the same DIP registers can be
 * used for both technologies.
 *
 * DW0: Reserved/ECC/DP | HB2 | HB1 | HB0
 * DW1:       DB3       | DB2 | DB1 | DB0
 * DW2:       DB7       | DB6 | DB5 | DB4
 * DW3: ...
 *
 * (HB is Header Byte, DB is Data Byte)
 *
 * The hdmi pack() functions don't know about that hardware specific hole so we
 * trick them by giving an offset into the buffer and moving back the header
 * bytes by one.
 */
static void intel_write_infoframe(struct intel_encoder *encoder,
                                  const struct intel_crtc_state *crtc_state,
                                  enum hdmi_infoframe_type type,
                                  const union hdmi_infoframe *frame)
{
        struct intel_digital_port *intel_dig_port = enc_to_dig_port(&encoder->base);
        u8 buffer[VIDEO_DIP_DATA_SIZE];
        ssize_t len;

        if ((crtc_state->infoframes.enable &
             intel_hdmi_infoframe_enable(type)) == 0)
                return;

        if (WARN_ON(frame->any.type != type))
                return;

        /* see comment above for the reason for this offset */
        len = hdmi_infoframe_pack_only(frame, buffer + 1, sizeof(buffer) - 1);
        if (WARN_ON(len < 0))
                return;

        /* Insert the 'hole' (see big comment above) at position 3 */
        memmove(&buffer[0], &buffer[1], 3);
        buffer[3] = 0;
        len++;

        intel_dig_port->write_infoframe(encoder, crtc_state, type, buffer, len);
}

void intel_read_infoframe(struct intel_encoder *encoder,
                          const struct intel_crtc_state *crtc_state,
                          enum hdmi_infoframe_type type,
                          union hdmi_infoframe *frame)
{
        struct intel_digital_port *intel_dig_port = enc_to_dig_port(&encoder->base);
        u8 buffer[VIDEO_DIP_DATA_SIZE];
        int ret;

        if ((crtc_state->infoframes.enable &
             intel_hdmi_infoframe_enable(type)) == 0)
                return;

        intel_dig_port->read_infoframe(encoder, crtc_state,
                                       type, buffer, sizeof(buffer));

        /* Fill the 'hole' (see big comment above) at position 3 */
        memmove(&buffer[1], &buffer[0], 3);

        /* see comment above for the reason for this offset */
        ret = hdmi_infoframe_unpack(frame, buffer + 1, sizeof(buffer) - 1);
        if (ret) {
                DRM_DEBUG_KMS("Failed to unpack infoframe type 0x%02x\n", type);
                return;
        }

        if (frame->any.type != type)
                DRM_DEBUG_KMS("Found the wrong infoframe type 0x%x (expected 0x%02x)\n",
                              frame->any.type, type);
}

static bool
intel_hdmi_compute_avi_infoframe(struct intel_encoder *encoder,
                                 struct intel_crtc_state *crtc_state,
                                 struct drm_connector_state *conn_state)
{
        struct hdmi_avi_infoframe *frame = &crtc_state->infoframes.avi.avi;
        const struct drm_display_mode *adjusted_mode =
                &crtc_state->base.adjusted_mode;
        struct drm_connector *connector = conn_state->connector;
        int ret;

        if (!crtc_state->has_infoframe)
                return true;

        crtc_state->infoframes.enable |=
                intel_hdmi_infoframe_enable(HDMI_INFOFRAME_TYPE_AVI);

        ret = drm_hdmi_avi_infoframe_from_display_mode(frame, connector,
                                                       adjusted_mode);
        if (ret)
                return false;

        if (crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR420)
                frame->colorspace = HDMI_COLORSPACE_YUV420;
        else if (crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR444)
                frame->colorspace = HDMI_COLORSPACE_YUV444;
        else
                frame->colorspace = HDMI_COLORSPACE_RGB;

        drm_hdmi_avi_infoframe_colorspace(frame, conn_state);

        drm_hdmi_avi_infoframe_quant_range(frame, connector,
                                           adjusted_mode,
                                           crtc_state->limited_color_range ?
                                           HDMI_QUANTIZATION_RANGE_LIMITED :
                                           HDMI_QUANTIZATION_RANGE_FULL);

        drm_hdmi_avi_infoframe_content_type(frame, conn_state);

        /* TODO: handle pixel repetition for YCBCR420 outputs */

        ret = hdmi_avi_infoframe_check(frame);
        if (WARN_ON(ret))
                return false;

        return true;
}

static bool
intel_hdmi_compute_spd_infoframe(struct intel_encoder *encoder,
                                 struct intel_crtc_state *crtc_state,
                                 struct drm_connector_state *conn_state)
{
        struct hdmi_spd_infoframe *frame = &crtc_state->infoframes.spd.spd;
        int ret;

        if (!crtc_state->has_infoframe)
                return true;

        crtc_state->infoframes.enable |=
                intel_hdmi_infoframe_enable(HDMI_INFOFRAME_TYPE_SPD);

        ret = hdmi_spd_infoframe_init(frame, "Intel", "Integrated gfx");
        if (WARN_ON(ret))
                return false;

        frame->sdi = HDMI_SPD_SDI_PC;

        ret = hdmi_spd_infoframe_check(frame);
        if (WARN_ON(ret))
                return false;

        return true;
}

static bool
intel_hdmi_compute_hdmi_infoframe(struct intel_encoder *encoder,
                                  struct intel_crtc_state *crtc_state,
                                  struct drm_connector_state *conn_state)
{
        struct hdmi_vendor_infoframe *frame =
                &crtc_state->infoframes.hdmi.vendor.hdmi;
        const struct drm_display_info *info =
                &conn_state->connector->display_info;
        int ret;

        if (!crtc_state->has_infoframe || !info->has_hdmi_infoframe)
                return true;

        crtc_state->infoframes.enable |=
                intel_hdmi_infoframe_enable(HDMI_INFOFRAME_TYPE_VENDOR);

        ret = drm_hdmi_vendor_infoframe_from_display_mode(frame,
                                                          conn_state->connector,
                                                          &crtc_state->base.adjusted_mode);
        if (WARN_ON(ret))
                return false;

        ret = hdmi_vendor_infoframe_check(frame);
        if (WARN_ON(ret))
                return false;

        return true;
}

static void g4x_set_infoframes(struct intel_encoder *encoder,
                               bool enable,
                               const struct intel_crtc_state *crtc_state,
                               const struct drm_connector_state *conn_state)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_digital_port *intel_dig_port = enc_to_dig_port(&encoder->base);
        struct intel_hdmi *intel_hdmi = &intel_dig_port->hdmi;
        i915_reg_t reg = VIDEO_DIP_CTL;
        u32 val = I915_READ(reg);
        u32 port = VIDEO_DIP_PORT(encoder->port);

        assert_hdmi_port_disabled(intel_hdmi);

        /* If the registers were not initialized yet, they might be zeroes,
         * which means we're selecting the AVI DIP and we're setting its
         * frequency to once. This seems to really confuse the HW and make
         * things stop working (the register spec says the AVI always needs to
         * be sent every VSync). So here we avoid writing to the register more
         * than we need and also explicitly select the AVI DIP and explicitly
         * set its frequency to every VSync. Avoiding to write it twice seems to
         * be enough to solve the problem, but being defensive shouldn't hurt us
         * either. */
        val |= VIDEO_DIP_SELECT_AVI | VIDEO_DIP_FREQ_VSYNC;

        if (!enable) {
                if (!(val & VIDEO_DIP_ENABLE))
                        return;
                if (port != (val & VIDEO_DIP_PORT_MASK)) {
                        DRM_DEBUG_KMS("video DIP still enabled on port %c\n",
                                      (val & VIDEO_DIP_PORT_MASK) >> 29);
                        return;
                }
                val &= ~(VIDEO_DIP_ENABLE | VIDEO_DIP_ENABLE_AVI |
                         VIDEO_DIP_ENABLE_VENDOR | VIDEO_DIP_ENABLE_SPD);
                I915_WRITE(reg, val);
                POSTING_READ(reg);
                return;
        }

        if (port != (val & VIDEO_DIP_PORT_MASK)) {
                if (val & VIDEO_DIP_ENABLE) {
                        DRM_DEBUG_KMS("video DIP already enabled on port %c\n",
                                      (val & VIDEO_DIP_PORT_MASK) >> 29);
                        return;
                }
                val &= ~VIDEO_DIP_PORT_MASK;
                val |= port;
        }

        val |= VIDEO_DIP_ENABLE;
        val &= ~(VIDEO_DIP_ENABLE_AVI |
                 VIDEO_DIP_ENABLE_VENDOR | VIDEO_DIP_ENABLE_SPD);

        I915_WRITE(reg, val);
        POSTING_READ(reg);

        intel_write_infoframe(encoder, crtc_state,
                              HDMI_INFOFRAME_TYPE_AVI,
                              &crtc_state->infoframes.avi);
        intel_write_infoframe(encoder, crtc_state,
                              HDMI_INFOFRAME_TYPE_SPD,
                              &crtc_state->infoframes.spd);
        intel_write_infoframe(encoder, crtc_state,
                              HDMI_INFOFRAME_TYPE_VENDOR,
                              &crtc_state->infoframes.hdmi);
}

/*
 * Determine if default_phase=1 can be indicated in the GCP infoframe.
 *
 * From HDMI specification 1.4a:
 * - The first pixel of each Video Data Period shall always have a pixel packing phase of 0
 * - The first pixel following each Video Data Period shall have a pixel packing phase of 0
 * - The PP bits shall be constant for all GCPs and will be equal to the last packing phase
 * - The first pixel following every transition of HSYNC or VSYNC shall have a pixel packing
 *   phase of 0
 */
static bool gcp_default_phase_possible(int pipe_bpp,
                                       const struct drm_display_mode *mode)
{
        unsigned int pixels_per_group;

        switch (pipe_bpp) {
        case 30:
                /* 4 pixels in 5 clocks */
                pixels_per_group = 4;
                break;
        case 36:
                /* 2 pixels in 3 clocks */
                pixels_per_group = 2;
                break;
        case 48:
                /* 1 pixel in 2 clocks */
                pixels_per_group = 1;
                break;
        default:
                /* phase information not relevant for 8bpc */
                return false;
        }

        return mode->crtc_hdisplay % pixels_per_group == 0 &&
                mode->crtc_htotal % pixels_per_group == 0 &&
                mode->crtc_hblank_start % pixels_per_group == 0 &&
                mode->crtc_hblank_end % pixels_per_group == 0 &&
                mode->crtc_hsync_start % pixels_per_group == 0 &&
                mode->crtc_hsync_end % pixels_per_group == 0 &&
                ((mode->flags & DRM_MODE_FLAG_INTERLACE) == 0 ||
                 mode->crtc_htotal/2 % pixels_per_group == 0);
}

static bool intel_hdmi_set_gcp_infoframe(struct intel_encoder *encoder,
                                         const struct intel_crtc_state *crtc_state,
                                         const struct drm_connector_state *conn_state)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
        i915_reg_t reg;

        if ((crtc_state->infoframes.enable &
             intel_hdmi_infoframe_enable(HDMI_PACKET_TYPE_GENERAL_CONTROL)) == 0)
                return false;

        if (HAS_DDI(dev_priv))
                reg = HSW_TVIDEO_DIP_GCP(crtc_state->cpu_transcoder);
        else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
                reg = VLV_TVIDEO_DIP_GCP(crtc->pipe);
        else if (HAS_PCH_SPLIT(dev_priv))
                reg = TVIDEO_DIP_GCP(crtc->pipe);
        else
                return false;

        I915_WRITE(reg, crtc_state->infoframes.gcp);

        return true;
}

void intel_hdmi_read_gcp_infoframe(struct intel_encoder *encoder,
                                   struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
        i915_reg_t reg;

        if ((crtc_state->infoframes.enable &
             intel_hdmi_infoframe_enable(HDMI_PACKET_TYPE_GENERAL_CONTROL)) == 0)
                return;

        if (HAS_DDI(dev_priv))
                reg = HSW_TVIDEO_DIP_GCP(crtc_state->cpu_transcoder);
        else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
                reg = VLV_TVIDEO_DIP_GCP(crtc->pipe);
        else if (HAS_PCH_SPLIT(dev_priv))
                reg = TVIDEO_DIP_GCP(crtc->pipe);
        else
                return;

        crtc_state->infoframes.gcp = I915_READ(reg);
}

static void intel_hdmi_compute_gcp_infoframe(struct intel_encoder *encoder,
                                             struct intel_crtc_state *crtc_state,
                                             struct drm_connector_state *conn_state)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);

        if (IS_G4X(dev_priv) || !crtc_state->has_infoframe)
                return;

        crtc_state->infoframes.enable |=
                intel_hdmi_infoframe_enable(HDMI_PACKET_TYPE_GENERAL_CONTROL);

        /* Indicate color indication for deep color mode */
        if (crtc_state->pipe_bpp > 24)
                crtc_state->infoframes.gcp |= GCP_COLOR_INDICATION;

        /* Enable default_phase whenever the display mode is suitably aligned */
        if (gcp_default_phase_possible(crtc_state->pipe_bpp,
                                       &crtc_state->base.adjusted_mode))
                crtc_state->infoframes.gcp |= GCP_DEFAULT_PHASE_ENABLE;
}

static void ibx_set_infoframes(struct intel_encoder *encoder,
                               bool enable,
                               const struct intel_crtc_state *crtc_state,
                               const struct drm_connector_state *conn_state)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc_state->base.crtc);
        struct intel_digital_port *intel_dig_port = enc_to_dig_port(&encoder->base);
        struct intel_hdmi *intel_hdmi = &intel_dig_port->hdmi;
        i915_reg_t reg = TVIDEO_DIP_CTL(intel_crtc->pipe);
        u32 val = I915_READ(reg);
        u32 port = VIDEO_DIP_PORT(encoder->port);

        assert_hdmi_port_disabled(intel_hdmi);

        /* See the big comment in g4x_set_infoframes() */
        val |= VIDEO_DIP_SELECT_AVI | VIDEO_DIP_FREQ_VSYNC;

        if (!enable) {
                if (!(val & VIDEO_DIP_ENABLE))
                        return;
                val &= ~(VIDEO_DIP_ENABLE | VIDEO_DIP_ENABLE_AVI |
                         VIDEO_DIP_ENABLE_VENDOR | VIDEO_DIP_ENABLE_GAMUT |
                         VIDEO_DIP_ENABLE_SPD | VIDEO_DIP_ENABLE_GCP);
                I915_WRITE(reg, val);
                POSTING_READ(reg);
                return;
        }

        if (port != (val & VIDEO_DIP_PORT_MASK)) {
                WARN(val & VIDEO_DIP_ENABLE,
                     "DIP already enabled on port %c\n",
                     (val & VIDEO_DIP_PORT_MASK) >> 29);
                val &= ~VIDEO_DIP_PORT_MASK;
                val |= port;
        }

        val |= VIDEO_DIP_ENABLE;
        val &= ~(VIDEO_DIP_ENABLE_AVI |
                 VIDEO_DIP_ENABLE_VENDOR | VIDEO_DIP_ENABLE_GAMUT |
                 VIDEO_DIP_ENABLE_SPD | VIDEO_DIP_ENABLE_GCP);

        if (intel_hdmi_set_gcp_infoframe(encoder, crtc_state, conn_state))
                val |= VIDEO_DIP_ENABLE_GCP;

        I915_WRITE(reg, val);
        POSTING_READ(reg);

        intel_write_infoframe(encoder, crtc_state,
                              HDMI_INFOFRAME_TYPE_AVI,
                              &crtc_state->infoframes.avi);
        intel_write_infoframe(encoder, crtc_state,
                              HDMI_INFOFRAME_TYPE_SPD,
                              &crtc_state->infoframes.spd);
        intel_write_infoframe(encoder, crtc_state,
                              HDMI_INFOFRAME_TYPE_VENDOR,
                              &crtc_state->infoframes.hdmi);
}

static void cpt_set_infoframes(struct intel_encoder *encoder,
                               bool enable,
                               const struct intel_crtc_state *crtc_state,
                               const struct drm_connector_state *conn_state)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc_state->base.crtc);
        struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base);
        i915_reg_t reg = TVIDEO_DIP_CTL(intel_crtc->pipe);
        u32 val = I915_READ(reg);

        assert_hdmi_port_disabled(intel_hdmi);

        /* See the big comment in g4x_set_infoframes() */
        val |= VIDEO_DIP_SELECT_AVI | VIDEO_DIP_FREQ_VSYNC;

        if (!enable) {
                if (!(val & VIDEO_DIP_ENABLE))
                        return;
                val &= ~(VIDEO_DIP_ENABLE | VIDEO_DIP_ENABLE_AVI |
                         VIDEO_DIP_ENABLE_VENDOR | VIDEO_DIP_ENABLE_GAMUT |
                         VIDEO_DIP_ENABLE_SPD | VIDEO_DIP_ENABLE_GCP);
                I915_WRITE(reg, val);
                POSTING_READ(reg);
                return;
        }

        /* Set both together, unset both together: see the spec. */
        val |= VIDEO_DIP_ENABLE | VIDEO_DIP_ENABLE_AVI;
        val &= ~(VIDEO_DIP_ENABLE_VENDOR | VIDEO_DIP_ENABLE_GAMUT |
                 VIDEO_DIP_ENABLE_SPD | VIDEO_DIP_ENABLE_GCP);

        if (intel_hdmi_set_gcp_infoframe(encoder, crtc_state, conn_state))
                val |= VIDEO_DIP_ENABLE_GCP;

        I915_WRITE(reg, val);
        POSTING_READ(reg);

        intel_write_infoframe(encoder, crtc_state,
                              HDMI_INFOFRAME_TYPE_AVI,
                              &crtc_state->infoframes.avi);
        intel_write_infoframe(encoder, crtc_state,
                              HDMI_INFOFRAME_TYPE_SPD,
                              &crtc_state->infoframes.spd);
        intel_write_infoframe(encoder, crtc_state,
                              HDMI_INFOFRAME_TYPE_VENDOR,
                              &crtc_state->infoframes.hdmi);
}

static void vlv_set_infoframes(struct intel_encoder *encoder,
                               bool enable,
                               const struct intel_crtc_state *crtc_state,
                               const struct drm_connector_state *conn_state)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc_state->base.crtc);
        struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base);
        i915_reg_t reg = VLV_TVIDEO_DIP_CTL(intel_crtc->pipe);
        u32 val = I915_READ(reg);
        u32 port = VIDEO_DIP_PORT(encoder->port);

        assert_hdmi_port_disabled(intel_hdmi);

        /* See the big comment in g4x_set_infoframes() */
        val |= VIDEO_DIP_SELECT_AVI | VIDEO_DIP_FREQ_VSYNC;

        if (!enable) {
                if (!(val & VIDEO_DIP_ENABLE))
                        return;
                val &= ~(VIDEO_DIP_ENABLE | VIDEO_DIP_ENABLE_AVI |
                         VIDEO_DIP_ENABLE_VENDOR | VIDEO_DIP_ENABLE_GAMUT |
                         VIDEO_DIP_ENABLE_SPD | VIDEO_DIP_ENABLE_GCP);
                I915_WRITE(reg, val);
                POSTING_READ(reg);
                return;
        }

        if (port != (val & VIDEO_DIP_PORT_MASK)) {
                WARN(val & VIDEO_DIP_ENABLE,
                     "DIP already enabled on port %c\n",
                     (val & VIDEO_DIP_PORT_MASK) >> 29);
                val &= ~VIDEO_DIP_PORT_MASK;
                val |= port;
        }

        val |= VIDEO_DIP_ENABLE;
        val &= ~(VIDEO_DIP_ENABLE_AVI |
                 VIDEO_DIP_ENABLE_VENDOR | VIDEO_DIP_ENABLE_GAMUT |
                 VIDEO_DIP_ENABLE_SPD | VIDEO_DIP_ENABLE_GCP);

        if (intel_hdmi_set_gcp_infoframe(encoder, crtc_state, conn_state))
                val |= VIDEO_DIP_ENABLE_GCP;

        I915_WRITE(reg, val);
        POSTING_READ(reg);

        intel_write_infoframe(encoder, crtc_state,
                              HDMI_INFOFRAME_TYPE_AVI,
                              &crtc_state->infoframes.avi);
        intel_write_infoframe(encoder, crtc_state,
                              HDMI_INFOFRAME_TYPE_SPD,
                              &crtc_state->infoframes.spd);
        intel_write_infoframe(encoder, crtc_state,
                              HDMI_INFOFRAME_TYPE_VENDOR,
                              &crtc_state->infoframes.hdmi);
}

static void hsw_set_infoframes(struct intel_encoder *encoder,
                               bool enable,
                               const struct intel_crtc_state *crtc_state,
                               const struct drm_connector_state *conn_state)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        i915_reg_t reg = HSW_TVIDEO_DIP_CTL(crtc_state->cpu_transcoder);
        u32 val = I915_READ(reg);

        assert_hdmi_transcoder_func_disabled(dev_priv,
                                             crtc_state->cpu_transcoder);

        val &= ~(VIDEO_DIP_ENABLE_VSC_HSW | VIDEO_DIP_ENABLE_AVI_HSW |
                 VIDEO_DIP_ENABLE_GCP_HSW | VIDEO_DIP_ENABLE_VS_HSW |
                 VIDEO_DIP_ENABLE_GMP_HSW | VIDEO_DIP_ENABLE_SPD_HSW);

        if (!enable) {
                I915_WRITE(reg, val);
                POSTING_READ(reg);
                return;
        }

        if (intel_hdmi_set_gcp_infoframe(encoder, crtc_state, conn_state))
                val |= VIDEO_DIP_ENABLE_GCP_HSW;

        I915_WRITE(reg, val);
        POSTING_READ(reg);

        intel_write_infoframe(encoder, crtc_state,
                              HDMI_INFOFRAME_TYPE_AVI,
                              &crtc_state->infoframes.avi);
        intel_write_infoframe(encoder, crtc_state,
                              HDMI_INFOFRAME_TYPE_SPD,
                              &crtc_state->infoframes.spd);
        intel_write_infoframe(encoder, crtc_state,
                              HDMI_INFOFRAME_TYPE_VENDOR,
                              &crtc_state->infoframes.hdmi);
}

void intel_dp_dual_mode_set_tmds_output(struct intel_hdmi *hdmi, bool enable)
{
        struct drm_i915_private *dev_priv = to_i915(intel_hdmi_to_dev(hdmi));
        struct i2c_adapter *adapter =
                intel_gmbus_get_adapter(dev_priv, hdmi->ddc_bus);

        if (hdmi->dp_dual_mode.type < DRM_DP_DUAL_MODE_TYPE2_DVI)
                return;

        DRM_DEBUG_KMS("%s DP dual mode adaptor TMDS output\n",
                      enable ? "Enabling" : "Disabling");

        drm_dp_dual_mode_set_tmds_output(hdmi->dp_dual_mode.type,
                                         adapter, enable);
}

static int intel_hdmi_hdcp_read(struct intel_digital_port *intel_dig_port,
                                unsigned int offset, void *buffer, size_t size)
{
        struct intel_hdmi *hdmi = &intel_dig_port->hdmi;
        struct drm_i915_private *dev_priv =
                intel_dig_port->base.base.dev->dev_private;
        struct i2c_adapter *adapter = intel_gmbus_get_adapter(dev_priv,
                                                              hdmi->ddc_bus);
        int ret;
        u8 start = offset & 0xff;
        struct i2c_msg msgs[] = {
                {
                        .addr = DRM_HDCP_DDC_ADDR,
                        .flags = 0,
                        .len = 1,
                        .buf = &start,
                },
                {
                        .addr = DRM_HDCP_DDC_ADDR,
                        .flags = I2C_M_RD,
                        .len = size,
                        .buf = buffer
                }
        };
        ret = i2c_transfer(adapter, msgs, ARRAY_SIZE(msgs));
        if (ret == ARRAY_SIZE(msgs))
                return 0;
        return ret >= 0 ? -EIO : ret;
}

static int intel_hdmi_hdcp_write(struct intel_digital_port *intel_dig_port,
                                 unsigned int offset, void *buffer, size_t size)
{
        struct intel_hdmi *hdmi = &intel_dig_port->hdmi;
        struct drm_i915_private *dev_priv =
                intel_dig_port->base.base.dev->dev_private;
        struct i2c_adapter *adapter = intel_gmbus_get_adapter(dev_priv,
                                                              hdmi->ddc_bus);
        int ret;
        u8 *write_buf;
        struct i2c_msg msg;

        write_buf = kzalloc(size + 1, GFP_KERNEL);
        if (!write_buf)
                return -ENOMEM;

        write_buf[0] = offset & 0xff;
        memcpy(&write_buf[1], buffer, size);

        msg.addr = DRM_HDCP_DDC_ADDR;
        msg.flags = 0,
        msg.len = size + 1,
        msg.buf = write_buf;

        ret = i2c_transfer(adapter, &msg, 1);
        if (ret == 1)
                ret = 0;
        else if (ret >= 0)
                ret = -EIO;

        kfree(write_buf);
        return ret;
}

static
int intel_hdmi_hdcp_write_an_aksv(struct intel_digital_port *intel_dig_port,
                                  u8 *an)
{
        struct intel_hdmi *hdmi = &intel_dig_port->hdmi;
        struct drm_i915_private *dev_priv =
                intel_dig_port->base.base.dev->dev_private;
        struct i2c_adapter *adapter = intel_gmbus_get_adapter(dev_priv,
                                                              hdmi->ddc_bus);
        int ret;

        ret = intel_hdmi_hdcp_write(intel_dig_port, DRM_HDCP_DDC_AN, an,
                                    DRM_HDCP_AN_LEN);
        if (ret) {
                DRM_DEBUG_KMS("Write An over DDC failed (%d)\n", ret);
                return ret;
        }

        ret = intel_gmbus_output_aksv(adapter);
        if (ret < 0) {
                DRM_DEBUG_KMS("Failed to output aksv (%d)\n", ret);
                return ret;
        }
        return 0;
}

static int intel_hdmi_hdcp_read_bksv(struct intel_digital_port *intel_dig_port,
                                     u8 *bksv)
{
        int ret;
        ret = intel_hdmi_hdcp_read(intel_dig_port, DRM_HDCP_DDC_BKSV, bksv,
                                   DRM_HDCP_KSV_LEN);
        if (ret)
                DRM_DEBUG_KMS("Read Bksv over DDC failed (%d)\n", ret);
        return ret;
}

static
int intel_hdmi_hdcp_read_bstatus(struct intel_digital_port *intel_dig_port,
                                 u8 *bstatus)
{
        int ret;
        ret = intel_hdmi_hdcp_read(intel_dig_port, DRM_HDCP_DDC_BSTATUS,
                                   bstatus, DRM_HDCP_BSTATUS_LEN);
        if (ret)
                DRM_DEBUG_KMS("Read bstatus over DDC failed (%d)\n", ret);
        return ret;
}

static
int intel_hdmi_hdcp_repeater_present(struct intel_digital_port *intel_dig_port,
                                     bool *repeater_present)
{
        int ret;
        u8 val;

        ret = intel_hdmi_hdcp_read(intel_dig_port, DRM_HDCP_DDC_BCAPS, &val, 1);
        if (ret) {
                DRM_DEBUG_KMS("Read bcaps over DDC failed (%d)\n", ret);
                return ret;
        }
        *repeater_present = val & DRM_HDCP_DDC_BCAPS_REPEATER_PRESENT;
        return 0;
}

static
int intel_hdmi_hdcp_read_ri_prime(struct intel_digital_port *intel_dig_port,
                                  u8 *ri_prime)
{
        int ret;
        ret = intel_hdmi_hdcp_read(intel_dig_port, DRM_HDCP_DDC_RI_PRIME,
                                   ri_prime, DRM_HDCP_RI_LEN);
        if (ret)
                DRM_DEBUG_KMS("Read Ri' over DDC failed (%d)\n", ret);
        return ret;
}

static
int intel_hdmi_hdcp_read_ksv_ready(struct intel_digital_port *intel_dig_port,
                                   bool *ksv_ready)
{
        int ret;
        u8 val;

        ret = intel_hdmi_hdcp_read(intel_dig_port, DRM_HDCP_DDC_BCAPS, &val, 1);
        if (ret) {
                DRM_DEBUG_KMS("Read bcaps over DDC failed (%d)\n", ret);
                return ret;
        }
        *ksv_ready = val & DRM_HDCP_DDC_BCAPS_KSV_FIFO_READY;
        return 0;
}

static
int intel_hdmi_hdcp_read_ksv_fifo(struct intel_digital_port *intel_dig_port,
                                  int num_downstream, u8 *ksv_fifo)
{
        int ret;
        ret = intel_hdmi_hdcp_read(intel_dig_port, DRM_HDCP_DDC_KSV_FIFO,
                                   ksv_fifo, num_downstream * DRM_HDCP_KSV_LEN);
        if (ret) {
                DRM_DEBUG_KMS("Read ksv fifo over DDC failed (%d)\n", ret);
                return ret;
        }
        return 0;
}

static
int intel_hdmi_hdcp_read_v_prime_part(struct intel_digital_port *intel_dig_port,
                                      int i, u32 *part)
{
        int ret;

        if (i >= DRM_HDCP_V_PRIME_NUM_PARTS)
                return -EINVAL;

        ret = intel_hdmi_hdcp_read(intel_dig_port, DRM_HDCP_DDC_V_PRIME(i),
                                   part, DRM_HDCP_V_PRIME_PART_LEN);
        if (ret)
                DRM_DEBUG_KMS("Read V'[%d] over DDC failed (%d)\n", i, ret);
        return ret;
}

static int kbl_repositioning_enc_en_signal(struct intel_connector *connector)
{
        struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
        struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector);
        struct drm_crtc *crtc = connector->base.state->crtc;
        struct intel_crtc *intel_crtc = container_of(crtc,
                                                     struct intel_crtc, base);
        u32 scanline;
        int ret;

        for (;;) {
                scanline = I915_READ(PIPEDSL(intel_crtc->pipe));
                if (scanline > 100 && scanline < 200)
                        break;
                usleep_range(25, 50);
        }

        ret = intel_ddi_toggle_hdcp_signalling(&intel_dig_port->base, false);
        if (ret) {
                DRM_ERROR("Disable HDCP signalling failed (%d)\n", ret);
                return ret;
        }
        ret = intel_ddi_toggle_hdcp_signalling(&intel_dig_port->base, true);
        if (ret) {
                DRM_ERROR("Enable HDCP signalling failed (%d)\n", ret);
                return ret;
        }

        return 0;
}

static
int intel_hdmi_hdcp_toggle_signalling(struct intel_digital_port *intel_dig_port,
                                      bool enable)
{
        struct intel_hdmi *hdmi = &intel_dig_port->hdmi;
        struct intel_connector *connector = hdmi->attached_connector;
        struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
        int ret;

        if (!enable)
                usleep_range(6, 60); /* Bspec says >= 6us */

        ret = intel_ddi_toggle_hdcp_signalling(&intel_dig_port->base, enable);
        if (ret) {
                DRM_ERROR("%s HDCP signalling failed (%d)\n",
                          enable ? "Enable" : "Disable", ret);
                return ret;
        }

        /*
         * WA: To fix incorrect positioning of the window of
         * opportunity and enc_en signalling in KABYLAKE.
         */
        if (IS_KABYLAKE(dev_priv) && enable)
                return kbl_repositioning_enc_en_signal(connector);

        return 0;
}

static
bool intel_hdmi_hdcp_check_link(struct intel_digital_port *intel_dig_port)
{
        struct drm_i915_private *dev_priv =
                intel_dig_port->base.base.dev->dev_private;
        enum port port = intel_dig_port->base.port;
        int ret;
        union {
                u32 reg;
                u8 shim[DRM_HDCP_RI_LEN];
        } ri;

        ret = intel_hdmi_hdcp_read_ri_prime(intel_dig_port, ri.shim);
        if (ret)
                return false;

        I915_WRITE(PORT_HDCP_RPRIME(port), ri.reg);

        /* Wait for Ri prime match */
        if (wait_for(I915_READ(PORT_HDCP_STATUS(port)) &
                     (HDCP_STATUS_RI_MATCH | HDCP_STATUS_ENC), 1)) {
                DRM_ERROR("Ri' mismatch detected, link check failed (%x)\n",
                          I915_READ(PORT_HDCP_STATUS(port)));
                return false;
        }
        return true;
}

static struct hdcp2_hdmi_msg_data {
        u8 msg_id;
        u32 timeout;
        u32 timeout2;
        } hdcp2_msg_data[] = {
                {HDCP_2_2_AKE_INIT, 0, 0},
                {HDCP_2_2_AKE_SEND_CERT, HDCP_2_2_CERT_TIMEOUT_MS, 0},
                {HDCP_2_2_AKE_NO_STORED_KM, 0, 0},
                {HDCP_2_2_AKE_STORED_KM, 0, 0},
                {HDCP_2_2_AKE_SEND_HPRIME, HDCP_2_2_HPRIME_PAIRED_TIMEOUT_MS,
                                HDCP_2_2_HPRIME_NO_PAIRED_TIMEOUT_MS},
                {HDCP_2_2_AKE_SEND_PAIRING_INFO, HDCP_2_2_PAIRING_TIMEOUT_MS,
                                0},
                {HDCP_2_2_LC_INIT, 0, 0},
                {HDCP_2_2_LC_SEND_LPRIME, HDCP_2_2_HDMI_LPRIME_TIMEOUT_MS, 0},
                {HDCP_2_2_SKE_SEND_EKS, 0, 0},
                {HDCP_2_2_REP_SEND_RECVID_LIST,
                                HDCP_2_2_RECVID_LIST_TIMEOUT_MS, 0},
                {HDCP_2_2_REP_SEND_ACK, 0, 0},
                {HDCP_2_2_REP_STREAM_MANAGE, 0, 0},
                {HDCP_2_2_REP_STREAM_READY, HDCP_2_2_STREAM_READY_TIMEOUT_MS,
                                0},
        };

static
int intel_hdmi_hdcp2_read_rx_status(struct intel_digital_port *intel_dig_port,
                                    u8 *rx_status)
{
        return intel_hdmi_hdcp_read(intel_dig_port,
                                    HDCP_2_2_HDMI_REG_RXSTATUS_OFFSET,
                                    rx_status,
                                    HDCP_2_2_HDMI_RXSTATUS_LEN);
}

static int get_hdcp2_msg_timeout(u8 msg_id, bool is_paired)
{
        int i;

        for (i = 0; i < ARRAY_SIZE(hdcp2_msg_data); i++)
                if (hdcp2_msg_data[i].msg_id == msg_id &&
                    (msg_id != HDCP_2_2_AKE_SEND_HPRIME || is_paired))
                        return hdcp2_msg_data[i].timeout;
                else if (hdcp2_msg_data[i].msg_id == msg_id)
                        return hdcp2_msg_data[i].timeout2;

        return -EINVAL;
}

static inline
int hdcp2_detect_msg_availability(struct intel_digital_port *intel_digital_port,
                                  u8 msg_id, bool *msg_ready,
                                  ssize_t *msg_sz)
{
        u8 rx_status[HDCP_2_2_HDMI_RXSTATUS_LEN];
        int ret;

        ret = intel_hdmi_hdcp2_read_rx_status(intel_digital_port, rx_status);
        if (ret < 0) {
                DRM_DEBUG_KMS("rx_status read failed. Err %d\n", ret);
                return ret;
        }

        *msg_sz = ((HDCP_2_2_HDMI_RXSTATUS_MSG_SZ_HI(rx_status[1]) << 8) |
                  rx_status[0]);

        if (msg_id == HDCP_2_2_REP_SEND_RECVID_LIST)
                *msg_ready = (HDCP_2_2_HDMI_RXSTATUS_READY(rx_status[1]) &&
                             *msg_sz);
        else
                *msg_ready = *msg_sz;

        return 0;
}

static ssize_t
intel_hdmi_hdcp2_wait_for_msg(struct intel_digital_port *intel_dig_port,
                              u8 msg_id, bool paired)
{
        bool msg_ready = false;
        int timeout, ret;
        ssize_t msg_sz = 0;

        timeout = get_hdcp2_msg_timeout(msg_id, paired);
        if (timeout < 0)
                return timeout;

        ret = __wait_for(ret = hdcp2_detect_msg_availability(intel_dig_port,
                                                             msg_id, &msg_ready,
                                                             &msg_sz),
                         !ret && msg_ready && msg_sz, timeout * 1000,
                         1000, 5 * 1000);
        if (ret)
                DRM_DEBUG_KMS("msg_id: %d, ret: %d, timeout: %d\n",
                              msg_id, ret, timeout);

        return ret ? ret : msg_sz;
}

static
int intel_hdmi_hdcp2_write_msg(struct intel_digital_port *intel_dig_port,
                               void *buf, size_t size)
{
        unsigned int offset;

        offset = HDCP_2_2_HDMI_REG_WR_MSG_OFFSET;
        return intel_hdmi_hdcp_write(intel_dig_port, offset, buf, size);
}

static
int intel_hdmi_hdcp2_read_msg(struct intel_digital_port *intel_dig_port,
                              u8 msg_id, void *buf, size_t size)
{
        struct intel_hdmi *hdmi = &intel_dig_port->hdmi;
        struct intel_hdcp *hdcp = &hdmi->attached_connector->hdcp;
        unsigned int offset;
        ssize_t ret;

        ret = intel_hdmi_hdcp2_wait_for_msg(intel_dig_port, msg_id,
                                            hdcp->is_paired);
        if (ret < 0)
                return ret;

        /*
         * Available msg size should be equal to or lesser than the
         * available buffer.
         */
        if (ret > size) {
                DRM_DEBUG_KMS("msg_sz(%zd) is more than exp size(%zu)\n",
                              ret, size);
                return -1;
        }

        offset = HDCP_2_2_HDMI_REG_RD_MSG_OFFSET;
        ret = intel_hdmi_hdcp_read(intel_dig_port, offset, buf, ret);
        if (ret)
                DRM_DEBUG_KMS("Failed to read msg_id: %d(%zd)\n", msg_id, ret);

        return ret;
}

static
int intel_hdmi_hdcp2_check_link(struct intel_digital_port *intel_dig_port)
{
        u8 rx_status[HDCP_2_2_HDMI_RXSTATUS_LEN];
        int ret;

        ret = intel_hdmi_hdcp2_read_rx_status(intel_dig_port, rx_status);
        if (ret)
                return ret;

        /*
         * Re-auth request and Link Integrity Failures are represented by
         * same bit. i.e reauth_req.
         */
        if (HDCP_2_2_HDMI_RXSTATUS_REAUTH_REQ(rx_status[1]))
                ret = HDCP_REAUTH_REQUEST;
        else if (HDCP_2_2_HDMI_RXSTATUS_READY(rx_status[1]))
                ret = HDCP_TOPOLOGY_CHANGE;

        return ret;
}

static
int intel_hdmi_hdcp2_capable(struct intel_digital_port *intel_dig_port,
                             bool *capable)
{
        u8 hdcp2_version;
        int ret;

        *capable = false;
        ret = intel_hdmi_hdcp_read(intel_dig_port, HDCP_2_2_HDMI_REG_VER_OFFSET,
                                   &hdcp2_version, sizeof(hdcp2_version));
        if (!ret && hdcp2_version & HDCP_2_2_HDMI_SUPPORT_MASK)
                *capable = true;

        return ret;
}

static inline
enum hdcp_wired_protocol intel_hdmi_hdcp2_protocol(void)
{
        return HDCP_PROTOCOL_HDMI;
}

static const struct intel_hdcp_shim intel_hdmi_hdcp_shim = {
        .write_an_aksv = intel_hdmi_hdcp_write_an_aksv,
        .read_bksv = intel_hdmi_hdcp_read_bksv,
        .read_bstatus = intel_hdmi_hdcp_read_bstatus,
        .repeater_present = intel_hdmi_hdcp_repeater_present,
        .read_ri_prime = intel_hdmi_hdcp_read_ri_prime,
        .read_ksv_ready = intel_hdmi_hdcp_read_ksv_ready,
        .read_ksv_fifo = intel_hdmi_hdcp_read_ksv_fifo,
        .read_v_prime_part = intel_hdmi_hdcp_read_v_prime_part,
        .toggle_signalling = intel_hdmi_hdcp_toggle_signalling,
        .check_link = intel_hdmi_hdcp_check_link,
        .write_2_2_msg = intel_hdmi_hdcp2_write_msg,
        .read_2_2_msg = intel_hdmi_hdcp2_read_msg,
        .check_2_2_link = intel_hdmi_hdcp2_check_link,
        .hdcp_2_2_capable = intel_hdmi_hdcp2_capable,
        .protocol = HDCP_PROTOCOL_HDMI,
};

static void intel_hdmi_prepare(struct intel_encoder *encoder,
                               const struct intel_crtc_state *crtc_state)
{
        struct drm_device *dev = encoder->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
        struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base);
        const struct drm_display_mode *adjusted_mode = &crtc_state->base.adjusted_mode;
        u32 hdmi_val;

        intel_dp_dual_mode_set_tmds_output(intel_hdmi, true);

        hdmi_val = SDVO_ENCODING_HDMI;
        if (!HAS_PCH_SPLIT(dev_priv) && crtc_state->limited_color_range)
                hdmi_val |= HDMI_COLOR_RANGE_16_235;
        if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
                hdmi_val |= SDVO_VSYNC_ACTIVE_HIGH;
        if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
                hdmi_val |= SDVO_HSYNC_ACTIVE_HIGH;

        if (crtc_state->pipe_bpp > 24)
                hdmi_val |= HDMI_COLOR_FORMAT_12bpc;
        else
                hdmi_val |= SDVO_COLOR_FORMAT_8bpc;

        if (crtc_state->has_hdmi_sink)
                hdmi_val |= HDMI_MODE_SELECT_HDMI;

        if (HAS_PCH_CPT(dev_priv))
                hdmi_val |= SDVO_PIPE_SEL_CPT(crtc->pipe);
        else if (IS_CHERRYVIEW(dev_priv))
                hdmi_val |= SDVO_PIPE_SEL_CHV(crtc->pipe);
        else
                hdmi_val |= SDVO_PIPE_SEL(crtc->pipe);

        I915_WRITE(intel_hdmi->hdmi_reg, hdmi_val);
        POSTING_READ(intel_hdmi->hdmi_reg);
}

static bool intel_hdmi_get_hw_state(struct intel_encoder *encoder,
                                    enum pipe *pipe)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base);
        intel_wakeref_t wakeref;
        bool ret;

        wakeref = intel_display_power_get_if_enabled(dev_priv,
                                                     encoder->power_domain);
        if (!wakeref)
                return false;

        ret = intel_sdvo_port_enabled(dev_priv, intel_hdmi->hdmi_reg, pipe);

        intel_display_power_put(dev_priv, encoder->power_domain, wakeref);

        return ret;
}

static void intel_hdmi_get_config(struct intel_encoder *encoder,
                                  struct intel_crtc_state *pipe_config)
{
        struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base);
        struct drm_device *dev = encoder->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        u32 tmp, flags = 0;
        int dotclock;

        pipe_config->output_types |= BIT(INTEL_OUTPUT_HDMI);

        tmp = I915_READ(intel_hdmi->hdmi_reg);

        if (tmp & SDVO_HSYNC_ACTIVE_HIGH)
                flags |= DRM_MODE_FLAG_PHSYNC;
        else
                flags |= DRM_MODE_FLAG_NHSYNC;

        if (tmp & SDVO_VSYNC_ACTIVE_HIGH)
                flags |= DRM_MODE_FLAG_PVSYNC;
        else
                flags |= DRM_MODE_FLAG_NVSYNC;

        if (tmp & HDMI_MODE_SELECT_HDMI)
                pipe_config->has_hdmi_sink = true;

        pipe_config->infoframes.enable |=
                intel_hdmi_infoframes_enabled(encoder, pipe_config);

        if (pipe_config->infoframes.enable)
                pipe_config->has_infoframe = true;

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

        if (!HAS_PCH_SPLIT(dev_priv) &&
            tmp & HDMI_COLOR_RANGE_16_235)
                pipe_config->limited_color_range = true;

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

        if ((tmp & SDVO_COLOR_FORMAT_MASK) == HDMI_COLOR_FORMAT_12bpc)
                dotclock = pipe_config->port_clock * 2 / 3;
        else
                dotclock = pipe_config->port_clock;

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

        pipe_config->base.adjusted_mode.crtc_clock = dotclock;

        pipe_config->lane_count = 4;

        intel_hdmi_read_gcp_infoframe(encoder, pipe_config);

        intel_read_infoframe(encoder, pipe_config,
                             HDMI_INFOFRAME_TYPE_AVI,
                             &pipe_config->infoframes.avi);
        intel_read_infoframe(encoder, pipe_config,
                             HDMI_INFOFRAME_TYPE_SPD,
                             &pipe_config->infoframes.spd);
        intel_read_infoframe(encoder, pipe_config,
                             HDMI_INFOFRAME_TYPE_VENDOR,
                             &pipe_config->infoframes.hdmi);
}

static void intel_enable_hdmi_audio(struct intel_encoder *encoder,
                                    const struct intel_crtc_state *pipe_config,
                                    const struct drm_connector_state *conn_state)
{
        struct intel_crtc *crtc = to_intel_crtc(pipe_config->base.crtc);

        WARN_ON(!pipe_config->has_hdmi_sink);
        DRM_DEBUG_DRIVER("Enabling HDMI audio on pipe %c\n",
                         pipe_name(crtc->pipe));
        intel_audio_codec_enable(encoder, pipe_config, conn_state);
}

static void g4x_enable_hdmi(struct intel_encoder *encoder,
                            const struct intel_crtc_state *pipe_config,
                            const struct drm_connector_state *conn_state)
{
        struct drm_device *dev = encoder->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base);
        u32 temp;

        temp = I915_READ(intel_hdmi->hdmi_reg);

        temp |= SDVO_ENABLE;
        if (pipe_config->has_audio)
                temp |= SDVO_AUDIO_ENABLE;

        I915_WRITE(intel_hdmi->hdmi_reg, temp);
        POSTING_READ(intel_hdmi->hdmi_reg);

        if (pipe_config->has_audio)
                intel_enable_hdmi_audio(encoder, pipe_config, conn_state);
}

static void ibx_enable_hdmi(struct intel_encoder *encoder,
                            const struct intel_crtc_state *pipe_config,
                            const struct drm_connector_state *conn_state)
{
        struct drm_device *dev = encoder->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base);
        u32 temp;

        temp = I915_READ(intel_hdmi->hdmi_reg);

        temp |= SDVO_ENABLE;
        if (pipe_config->has_audio)
                temp |= SDVO_AUDIO_ENABLE;

        /*
         * HW workaround, need to write this twice for issue
         * that may result in first write getting masked.
         */
        I915_WRITE(intel_hdmi->hdmi_reg, temp);
        POSTING_READ(intel_hdmi->hdmi_reg);
        I915_WRITE(intel_hdmi->hdmi_reg, temp);
        POSTING_READ(intel_hdmi->hdmi_reg);

        /*
         * HW workaround, need to toggle enable bit off and on
         * for 12bpc with pixel repeat.
         *
         * FIXME: BSpec says this should be done at the end of
         * of the modeset sequence, so not sure if this isn't too soon.
         */
        if (pipe_config->pipe_bpp > 24 &&
            pipe_config->pixel_multiplier > 1) {
                I915_WRITE(intel_hdmi->hdmi_reg, temp & ~SDVO_ENABLE);
                POSTING_READ(intel_hdmi->hdmi_reg);

                /*
                 * HW workaround, need to write this twice for issue
                 * that may result in first write getting masked.
                 */
                I915_WRITE(intel_hdmi->hdmi_reg, temp);
                POSTING_READ(intel_hdmi->hdmi_reg);
                I915_WRITE(intel_hdmi->hdmi_reg, temp);
                POSTING_READ(intel_hdmi->hdmi_reg);
        }

        if (pipe_config->has_audio)
                intel_enable_hdmi_audio(encoder, pipe_config, conn_state);
}

static void cpt_enable_hdmi(struct intel_encoder *encoder,
                            const struct intel_crtc_state *pipe_config,
                            const struct drm_connector_state *conn_state)
{
        struct drm_device *dev = encoder->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_crtc *crtc = to_intel_crtc(pipe_config->base.crtc);
        struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base);
        enum pipe pipe = crtc->pipe;
        u32 temp;

        temp = I915_READ(intel_hdmi->hdmi_reg);

        temp |= SDVO_ENABLE;
        if (pipe_config->has_audio)
                temp |= SDVO_AUDIO_ENABLE;

        /*
         * WaEnableHDMI8bpcBefore12bpc:snb,ivb
         *
         * The procedure for 12bpc is as follows:
         * 1. disable HDMI clock gating
         * 2. enable HDMI with 8bpc
         * 3. enable HDMI with 12bpc
         * 4. enable HDMI clock gating
         */

        if (pipe_config->pipe_bpp > 24) {
                I915_WRITE(TRANS_CHICKEN1(pipe),
                           I915_READ(TRANS_CHICKEN1(pipe)) |
                           TRANS_CHICKEN1_HDMIUNIT_GC_DISABLE);

                temp &= ~SDVO_COLOR_FORMAT_MASK;
                temp |= SDVO_COLOR_FORMAT_8bpc;
        }

        I915_WRITE(intel_hdmi->hdmi_reg, temp);
        POSTING_READ(intel_hdmi->hdmi_reg);

        if (pipe_config->pipe_bpp > 24) {
                temp &= ~SDVO_COLOR_FORMAT_MASK;
                temp |= HDMI_COLOR_FORMAT_12bpc;

                I915_WRITE(intel_hdmi->hdmi_reg, temp);
                POSTING_READ(intel_hdmi->hdmi_reg);

                I915_WRITE(TRANS_CHICKEN1(pipe),
                           I915_READ(TRANS_CHICKEN1(pipe)) &
                           ~TRANS_CHICKEN1_HDMIUNIT_GC_DISABLE);
        }

        if (pipe_config->has_audio)
                intel_enable_hdmi_audio(encoder, pipe_config, conn_state);
}

static void vlv_enable_hdmi(struct intel_encoder *encoder,
                            const struct intel_crtc_state *pipe_config,
                            const struct drm_connector_state *conn_state)
{
}

static void intel_disable_hdmi(struct intel_encoder *encoder,
                               const struct intel_crtc_state *old_crtc_state,
                               const struct drm_connector_state *old_conn_state)
{
        struct drm_device *dev = encoder->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base);
        struct intel_digital_port *intel_dig_port =
                hdmi_to_dig_port(intel_hdmi);
        struct intel_crtc *crtc = to_intel_crtc(old_crtc_state->base.crtc);
        u32 temp;

        temp = I915_READ(intel_hdmi->hdmi_reg);

        temp &= ~(SDVO_ENABLE | SDVO_AUDIO_ENABLE);
        I915_WRITE(intel_hdmi->hdmi_reg, temp);
        POSTING_READ(intel_hdmi->hdmi_reg);

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

                temp &= ~SDVO_PIPE_SEL_MASK;
                temp |= SDVO_ENABLE | SDVO_PIPE_SEL(PIPE_A);
                /*
                 * HW workaround, need to write this twice for issue
                 * that may result in first write getting masked.
                 */
                I915_WRITE(intel_hdmi->hdmi_reg, temp);
                POSTING_READ(intel_hdmi->hdmi_reg);
                I915_WRITE(intel_hdmi->hdmi_reg, temp);
                POSTING_READ(intel_hdmi->hdmi_reg);

                temp &= ~SDVO_ENABLE;
                I915_WRITE(intel_hdmi->hdmi_reg, temp);
                POSTING_READ(intel_hdmi->hdmi_reg);

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

        intel_dig_port->set_infoframes(encoder,
                                       false,
                                       old_crtc_state, old_conn_state);

        intel_dp_dual_mode_set_tmds_output(intel_hdmi, false);
}

static void g4x_disable_hdmi(struct intel_encoder *encoder,
                             const struct intel_crtc_state *old_crtc_state,
                             const struct drm_connector_state *old_conn_state)
{
        if (old_crtc_state->has_audio)
                intel_audio_codec_disable(encoder,
                                          old_crtc_state, old_conn_state);

        intel_disable_hdmi(encoder, old_crtc_state, old_conn_state);
}

static void pch_disable_hdmi(struct intel_encoder *encoder,
                             const struct intel_crtc_state *old_crtc_state,
                             const struct drm_connector_state *old_conn_state)
{
        if (old_crtc_state->has_audio)
                intel_audio_codec_disable(encoder,
                                          old_crtc_state, old_conn_state);
}

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

static int intel_hdmi_source_max_tmds_clock(struct intel_encoder *encoder)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        const struct ddi_vbt_port_info *info =
                &dev_priv->vbt.ddi_port_info[encoder->port];
        int max_tmds_clock;

        if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv))
                max_tmds_clock = 594000;
        else if (INTEL_GEN(dev_priv) >= 8 || IS_HASWELL(dev_priv))
                max_tmds_clock = 300000;
        else if (INTEL_GEN(dev_priv) >= 5)
                max_tmds_clock = 225000;
        else
                max_tmds_clock = 165000;

        if (info->max_tmds_clock)
                max_tmds_clock = min(max_tmds_clock, info->max_tmds_clock);

        return max_tmds_clock;
}

static int hdmi_port_clock_limit(struct intel_hdmi *hdmi,
                                 bool respect_downstream_limits,
                                 bool force_dvi)
{
        struct intel_encoder *encoder = &hdmi_to_dig_port(hdmi)->base;
        int max_tmds_clock = intel_hdmi_source_max_tmds_clock(encoder);

        if (respect_downstream_limits) {
                struct intel_connector *connector = hdmi->attached_connector;
                const struct drm_display_info *info = &connector->base.display_info;

                if (hdmi->dp_dual_mode.max_tmds_clock)
                        max_tmds_clock = min(max_tmds_clock,
                                             hdmi->dp_dual_mode.max_tmds_clock);

                if (info->max_tmds_clock)
                        max_tmds_clock = min(max_tmds_clock,
                                             info->max_tmds_clock);
                else if (!hdmi->has_hdmi_sink || force_dvi)
                        max_tmds_clock = min(max_tmds_clock, 165000);
        }

        return max_tmds_clock;
}

static enum drm_mode_status
hdmi_port_clock_valid(struct intel_hdmi *hdmi,
                      int clock, bool respect_downstream_limits,
                      bool force_dvi)
{
        struct drm_i915_private *dev_priv = to_i915(intel_hdmi_to_dev(hdmi));

        if (clock < 25000)
                return MODE_CLOCK_LOW;
        if (clock > hdmi_port_clock_limit(hdmi, respect_downstream_limits, force_dvi))
                return MODE_CLOCK_HIGH;

        /* BXT DPLL can't generate 223-240 MHz */
        if (IS_GEN9_LP(dev_priv) && clock > 223333 && clock < 240000)
                return MODE_CLOCK_RANGE;

        /* CHV DPLL can't generate 216-240 MHz */
        if (IS_CHERRYVIEW(dev_priv) && clock > 216000 && clock < 240000)
                return MODE_CLOCK_RANGE;

        return MODE_OK;
}

static enum drm_mode_status
intel_hdmi_mode_valid(struct drm_connector *connector,
                      struct drm_display_mode *mode)
{
        struct intel_hdmi *hdmi = intel_attached_hdmi(connector);
        struct drm_device *dev = intel_hdmi_to_dev(hdmi);
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum drm_mode_status status;
        int clock;
        int max_dotclk = to_i915(connector->dev)->max_dotclk_freq;
        bool force_dvi =
                READ_ONCE(to_intel_digital_connector_state(connector->state)->force_audio) == HDMI_AUDIO_OFF_DVI;

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

        clock = mode->clock;

        if ((mode->flags & DRM_MODE_FLAG_3D_MASK) == DRM_MODE_FLAG_3D_FRAME_PACKING)
                clock *= 2;

        if (clock > max_dotclk)
                return MODE_CLOCK_HIGH;

        if (mode->flags & DRM_MODE_FLAG_DBLCLK)
                clock *= 2;

        if (drm_mode_is_420_only(&connector->display_info, mode))
                clock /= 2;

        /* check if we can do 8bpc */
        status = hdmi_port_clock_valid(hdmi, clock, true, force_dvi);

        if (hdmi->has_hdmi_sink && !force_dvi) {
                /* if we can't do 8bpc we may still be able to do 12bpc */
                if (status != MODE_OK && !HAS_GMCH(dev_priv))
                        status = hdmi_port_clock_valid(hdmi, clock * 3 / 2,
                                                       true, force_dvi);

                /* if we can't do 8,12bpc we may still be able to do 10bpc */
                if (status != MODE_OK && INTEL_GEN(dev_priv) >= 11)
                        status = hdmi_port_clock_valid(hdmi, clock * 5 / 4,
                                                       true, force_dvi);
        }

        return status;
}

static bool hdmi_deep_color_possible(const struct intel_crtc_state *crtc_state,
                                     int bpc)
{
        struct drm_i915_private *dev_priv =
                to_i915(crtc_state->base.crtc->dev);
        struct drm_atomic_state *state = crtc_state->base.state;
        struct drm_connector_state *connector_state;
        struct drm_connector *connector;
        const struct drm_display_mode *adjusted_mode =
                &crtc_state->base.adjusted_mode;
        int i;

        if (HAS_GMCH(dev_priv))
                return false;

        if (bpc == 10 && INTEL_GEN(dev_priv) < 11)
                return false;

        if (crtc_state->pipe_bpp < bpc * 3)
                return false;

        if (!crtc_state->has_hdmi_sink)
                return false;

        /*
         * HDMI deep color affects the clocks, so it's only possible
         * when not cloning with other encoder types.
         */
        if (crtc_state->output_types != 1 << INTEL_OUTPUT_HDMI)
                return false;

        for_each_new_connector_in_state(state, connector, connector_state, i) {
                const struct drm_display_info *info = &connector->display_info;

                if (connector_state->crtc != crtc_state->base.crtc)
                        continue;

                if (crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR420) {
                        const struct drm_hdmi_info *hdmi = &info->hdmi;

                        if (bpc == 12 && !(hdmi->y420_dc_modes &
                                           DRM_EDID_YCBCR420_DC_36))
                                return false;
                        else if (bpc == 10 && !(hdmi->y420_dc_modes &
                                                DRM_EDID_YCBCR420_DC_30))
                                return false;
                } else {
                        if (bpc == 12 && !(info->edid_hdmi_dc_modes &
                                           DRM_EDID_HDMI_DC_36))
                                return false;
                        else if (bpc == 10 && !(info->edid_hdmi_dc_modes &
                                                DRM_EDID_HDMI_DC_30))
                                return false;
                }
        }

        /* Display WA #1139: glk */
        if (bpc == 12 && IS_GLK_REVID(dev_priv, 0, GLK_REVID_A1) &&
            adjusted_mode->htotal > 5460)
                return false;

        /* Display Wa_1405510057:icl */
        if (crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR420 &&
            bpc == 10 && INTEL_GEN(dev_priv) >= 11 &&
            (adjusted_mode->crtc_hblank_end -
             adjusted_mode->crtc_hblank_start) % 8 == 2)
                return false;

        return true;
}

static bool
intel_hdmi_ycbcr420_config(struct drm_connector *connector,
                           struct intel_crtc_state *config,
                           int *clock_12bpc, int *clock_10bpc,
                           int *clock_8bpc)
{
        struct intel_crtc *intel_crtc = to_intel_crtc(config->base.crtc);

        if (!connector->ycbcr_420_allowed) {
                DRM_ERROR("Platform doesn't support YCBCR420 output\n");
                return false;
        }

        /* YCBCR420 TMDS rate requirement is half the pixel clock */
        config->port_clock /= 2;
        *clock_12bpc /= 2;
        *clock_10bpc /= 2;
        *clock_8bpc /= 2;
        config->output_format = INTEL_OUTPUT_FORMAT_YCBCR420;

        /* YCBCR 420 output conversion needs a scaler */
        if (skl_update_scaler_crtc(config)) {
                DRM_DEBUG_KMS("Scaler allocation for output failed\n");
                return false;
        }

        intel_pch_panel_fitting(intel_crtc, config,
                                DRM_MODE_SCALE_FULLSCREEN);

        return true;
}

int intel_hdmi_compute_config(struct intel_encoder *encoder,
                              struct intel_crtc_state *pipe_config,
                              struct drm_connector_state *conn_state)
{
        struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base);
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
        struct drm_connector *connector = conn_state->connector;
        struct drm_scdc *scdc = &connector->display_info.hdmi.scdc;
        struct intel_digital_connector_state *intel_conn_state =
                to_intel_digital_connector_state(conn_state);
        int clock_8bpc = pipe_config->base.adjusted_mode.crtc_clock;
        int clock_10bpc = clock_8bpc * 5 / 4;
        int clock_12bpc = clock_8bpc * 3 / 2;
        int desired_bpp;
        bool force_dvi = intel_conn_state->force_audio == HDMI_AUDIO_OFF_DVI;

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

        pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
        pipe_config->has_hdmi_sink = !force_dvi && intel_hdmi->has_hdmi_sink;

        if (pipe_config->has_hdmi_sink)
                pipe_config->has_infoframe = true;

        if (intel_conn_state->broadcast_rgb == INTEL_BROADCAST_RGB_AUTO) {
                /* See CEA-861-E - 5.1 Default Encoding Parameters */
                pipe_config->limited_color_range =
                        pipe_config->has_hdmi_sink &&
                        drm_default_rgb_quant_range(adjusted_mode) ==
                        HDMI_QUANTIZATION_RANGE_LIMITED;
        } else {
                pipe_config->limited_color_range =
                        intel_conn_state->broadcast_rgb == INTEL_BROADCAST_RGB_LIMITED;
        }

        if (adjusted_mode->flags & DRM_MODE_FLAG_DBLCLK) {
                pipe_config->pixel_multiplier = 2;
                clock_8bpc *= 2;
                clock_10bpc *= 2;
                clock_12bpc *= 2;
        }

        if (drm_mode_is_420_only(&connector->display_info, adjusted_mode)) {
                if (!intel_hdmi_ycbcr420_config(connector, pipe_config,
                                                &clock_12bpc, &clock_10bpc,
                                                &clock_8bpc)) {
                        DRM_ERROR("Can't support YCBCR420 output\n");
                        return -EINVAL;
                }
        }

        if (HAS_PCH_SPLIT(dev_priv) && !HAS_DDI(dev_priv))
                pipe_config->has_pch_encoder = true;

        if (pipe_config->has_hdmi_sink) {
                if (intel_conn_state->force_audio == HDMI_AUDIO_AUTO)
                        pipe_config->has_audio = intel_hdmi->has_audio;
                else
                        pipe_config->has_audio =
                                intel_conn_state->force_audio == HDMI_AUDIO_ON;
        }

        /*
         * Note that g4x/vlv don't support 12bpc hdmi outputs. We also need
         * to check that the higher clock still fits within limits.
         */
        if (hdmi_deep_color_possible(pipe_config, 12) &&
            hdmi_port_clock_valid(intel_hdmi, clock_12bpc,
                                  true, force_dvi) == MODE_OK) {
                DRM_DEBUG_KMS("picking bpc to 12 for HDMI output\n");
                desired_bpp = 12*3;

                /* Need to adjust the port link by 1.5x for 12bpc. */
                pipe_config->port_clock = clock_12bpc;
        } else if (hdmi_deep_color_possible(pipe_config, 10) &&
                   hdmi_port_clock_valid(intel_hdmi, clock_10bpc,
                                         true, force_dvi) == MODE_OK) {
                DRM_DEBUG_KMS("picking bpc to 10 for HDMI output\n");
                desired_bpp = 10 * 3;

                /* Need to adjust the port link by 1.25x for 10bpc. */
                pipe_config->port_clock = clock_10bpc;
        } else {
                DRM_DEBUG_KMS("picking bpc to 8 for HDMI output\n");
                desired_bpp = 8*3;

                pipe_config->port_clock = clock_8bpc;
        }

        if (!pipe_config->bw_constrained) {
                DRM_DEBUG_KMS("forcing pipe bpp to %i for HDMI\n", desired_bpp);
                pipe_config->pipe_bpp = desired_bpp;
        }

        if (hdmi_port_clock_valid(intel_hdmi, pipe_config->port_clock,
                                  false, force_dvi) != MODE_OK) {
                DRM_DEBUG_KMS("unsupported HDMI clock, rejecting mode\n");
                return -EINVAL;
        }

        /* Set user selected PAR to incoming mode's member */
        adjusted_mode->picture_aspect_ratio = conn_state->picture_aspect_ratio;

        pipe_config->lane_count = 4;

        if (scdc->scrambling.supported && (INTEL_GEN(dev_priv) >= 10 ||
                                           IS_GEMINILAKE(dev_priv))) {
                if (scdc->scrambling.low_rates)
                        pipe_config->hdmi_scrambling = true;

                if (pipe_config->port_clock > 340000) {
                        pipe_config->hdmi_scrambling = true;
                        pipe_config->hdmi_high_tmds_clock_ratio = true;
                }
        }

        intel_hdmi_compute_gcp_infoframe(encoder, pipe_config, conn_state);

        if (!intel_hdmi_compute_avi_infoframe(encoder, pipe_config, conn_state)) {
                DRM_DEBUG_KMS("bad AVI infoframe\n");
                return -EINVAL;
        }

        if (!intel_hdmi_compute_spd_infoframe(encoder, pipe_config, conn_state)) {
                DRM_DEBUG_KMS("bad SPD infoframe\n");
                return -EINVAL;
        }

        if (!intel_hdmi_compute_hdmi_infoframe(encoder, pipe_config, conn_state)) {
                DRM_DEBUG_KMS("bad HDMI infoframe\n");
                return -EINVAL;
        }

        return 0;
}

static void
intel_hdmi_unset_edid(struct drm_connector *connector)
{
        struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);

        intel_hdmi->has_hdmi_sink = false;
        intel_hdmi->has_audio = false;

        intel_hdmi->dp_dual_mode.type = DRM_DP_DUAL_MODE_NONE;
        intel_hdmi->dp_dual_mode.max_tmds_clock = 0;

        kfree(to_intel_connector(connector)->detect_edid);
        to_intel_connector(connector)->detect_edid = NULL;
}

static void
intel_hdmi_dp_dual_mode_detect(struct drm_connector *connector, bool has_edid)
{
        struct drm_i915_private *dev_priv = to_i915(connector->dev);
        struct intel_hdmi *hdmi = intel_attached_hdmi(connector);
        enum port port = hdmi_to_dig_port(hdmi)->base.port;
        struct i2c_adapter *adapter =
                intel_gmbus_get_adapter(dev_priv, hdmi->ddc_bus);
        enum drm_dp_dual_mode_type type = drm_dp_dual_mode_detect(adapter);

        /*
         * Type 1 DVI adaptors are not required to implement any
         * registers, so we can't always detect their presence.
         * Ideally we should be able to check the state of the
         * CONFIG1 pin, but no such luck on our hardware.
         *
         * The only method left to us is to check the VBT to see
         * if the port is a dual mode capable DP port. But let's
         * only do that when we sucesfully read the EDID, to avoid
         * confusing log messages about DP dual mode adaptors when
         * there's nothing connected to the port.
         */
        if (type == DRM_DP_DUAL_MODE_UNKNOWN) {
                /* An overridden EDID imply that we want this port for testing.
                 * Make sure not to set limits for that port.
                 */
                if (has_edid && !connector->override_edid &&
                    intel_bios_is_port_dp_dual_mode(dev_priv, port)) {
                        DRM_DEBUG_KMS("Assuming DP dual mode adaptor presence based on VBT\n");
                        type = DRM_DP_DUAL_MODE_TYPE1_DVI;
                } else {
                        type = DRM_DP_DUAL_MODE_NONE;
                }
        }

        if (type == DRM_DP_DUAL_MODE_NONE)
                return;

        hdmi->dp_dual_mode.type = type;
        hdmi->dp_dual_mode.max_tmds_clock =
                drm_dp_dual_mode_max_tmds_clock(type, adapter);

        DRM_DEBUG_KMS("DP dual mode adaptor (%s) detected (max TMDS clock: %d kHz)\n",
                      drm_dp_get_dual_mode_type_name(type),
                      hdmi->dp_dual_mode.max_tmds_clock);
}

static bool
intel_hdmi_set_edid(struct drm_connector *connector)
{
        struct drm_i915_private *dev_priv = to_i915(connector->dev);
        struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
        intel_wakeref_t wakeref;
        struct edid *edid;
        bool connected = false;
        struct i2c_adapter *i2c;

        wakeref = intel_display_power_get(dev_priv, POWER_DOMAIN_GMBUS);

        i2c = intel_gmbus_get_adapter(dev_priv, intel_hdmi->ddc_bus);

        edid = drm_get_edid(connector, i2c);

        if (!edid && !intel_gmbus_is_forced_bit(i2c)) {
                DRM_DEBUG_KMS("HDMI GMBUS EDID read failed, retry using GPIO bit-banging\n");
                intel_gmbus_force_bit(i2c, true);
                edid = drm_get_edid(connector, i2c);
                intel_gmbus_force_bit(i2c, false);
        }

        intel_hdmi_dp_dual_mode_detect(connector, edid != NULL);

        intel_display_power_put(dev_priv, POWER_DOMAIN_GMBUS, wakeref);

        to_intel_connector(connector)->detect_edid = edid;
        if (edid && edid->input & DRM_EDID_INPUT_DIGITAL) {
                intel_hdmi->has_audio = drm_detect_monitor_audio(edid);
                intel_hdmi->has_hdmi_sink = drm_detect_hdmi_monitor(edid);

                connected = true;
        }

        cec_notifier_set_phys_addr_from_edid(intel_hdmi->cec_notifier, edid);

        return connected;
}

static enum drm_connector_status
intel_hdmi_detect(struct drm_connector *connector, bool force)
{
        enum drm_connector_status status = connector_status_disconnected;
        struct drm_i915_private *dev_priv = to_i915(connector->dev);
        struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
        struct intel_encoder *encoder = &hdmi_to_dig_port(intel_hdmi)->base;
        intel_wakeref_t wakeref;

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

        wakeref = intel_display_power_get(dev_priv, POWER_DOMAIN_GMBUS);

        if (INTEL_GEN(dev_priv) >= 11 &&
            !intel_digital_port_connected(encoder))
                goto out;

        intel_hdmi_unset_edid(connector);

        if (intel_hdmi_set_edid(connector))
                status = connector_status_connected;

out:
        intel_display_power_put(dev_priv, POWER_DOMAIN_GMBUS, wakeref);

        if (status != connector_status_connected)
                cec_notifier_phys_addr_invalidate(intel_hdmi->cec_notifier);

        return status;
}

static void
intel_hdmi_force(struct drm_connector *connector)
{
        DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
                      connector->base.id, connector->name);

        intel_hdmi_unset_edid(connector);

        if (connector->status != connector_status_connected)
                return;

        intel_hdmi_set_edid(connector);
}

static int intel_hdmi_get_modes(struct drm_connector *connector)
{
        struct edid *edid;

        edid = to_intel_connector(connector)->detect_edid;
        if (edid == NULL)
                return 0;

        return intel_connector_update_modes(connector, edid);
}

static void intel_hdmi_pre_enable(struct intel_encoder *encoder,
                                  const struct intel_crtc_state *pipe_config,
                                  const struct drm_connector_state *conn_state)
{
        struct intel_digital_port *intel_dig_port =
                enc_to_dig_port(&encoder->base);

        intel_hdmi_prepare(encoder, pipe_config);

        intel_dig_port->set_infoframes(encoder,
                                       pipe_config->has_infoframe,
                                       pipe_config, conn_state);
}

static void vlv_hdmi_pre_enable(struct intel_encoder *encoder,
                                const struct intel_crtc_state *pipe_config,
                                const struct drm_connector_state *conn_state)
{
        struct intel_digital_port *dport = enc_to_dig_port(&encoder->base);
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);

        vlv_phy_pre_encoder_enable(encoder, pipe_config);

        /* HDMI 1.0V-2dB */
        vlv_set_phy_signal_level(encoder, 0x2b245f5f, 0x00002000, 0x5578b83a,
                                 0x2b247878);

        dport->set_infoframes(encoder,
                              pipe_config->has_infoframe,
                              pipe_config, conn_state);

        g4x_enable_hdmi(encoder, pipe_config, conn_state);

        vlv_wait_port_ready(dev_priv, dport, 0x0);
}

static void vlv_hdmi_pre_pll_enable(struct intel_encoder *encoder,
                                    const struct intel_crtc_state *pipe_config,
                                    const struct drm_connector_state *conn_state)
{
        intel_hdmi_prepare(encoder, pipe_config);

        vlv_phy_pre_pll_enable(encoder, pipe_config);
}

static void chv_hdmi_pre_pll_enable(struct intel_encoder *encoder,
                                    const struct intel_crtc_state *pipe_config,
                                    const struct drm_connector_state *conn_state)
{
        intel_hdmi_prepare(encoder, pipe_config);

        chv_phy_pre_pll_enable(encoder, pipe_config);
}

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

static void vlv_hdmi_post_disable(struct intel_encoder *encoder,
                                  const struct intel_crtc_state *old_crtc_state,
                                  const struct drm_connector_state *old_conn_state)
{
        /* Reset lanes to avoid HDMI flicker (VLV w/a) */
        vlv_phy_reset_lanes(encoder, old_crtc_state);
}

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

        vlv_dpio_get(dev_priv);

        /* Assert data lane reset */
        chv_data_lane_soft_reset(encoder, old_crtc_state, true);

        vlv_dpio_put(dev_priv);
}

static void chv_hdmi_pre_enable(struct intel_encoder *encoder,
                                const struct intel_crtc_state *pipe_config,
                                const struct drm_connector_state *conn_state)
{
        struct intel_digital_port *dport = enc_to_dig_port(&encoder->base);
        struct drm_device *dev = encoder->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);

        chv_phy_pre_encoder_enable(encoder, pipe_config);

        /* FIXME: Program the support xxx V-dB */
        /* Use 800mV-0dB */
        chv_set_phy_signal_level(encoder, 128, 102, false);

        dport->set_infoframes(encoder,
                              pipe_config->has_infoframe,
                              pipe_config, conn_state);

        g4x_enable_hdmi(encoder, pipe_config, conn_state);

        vlv_wait_port_ready(dev_priv, dport, 0x0);

        /* Second common lane will stay alive on its own now */
        chv_phy_release_cl2_override(encoder);
}

static int
intel_hdmi_connector_register(struct drm_connector *connector)
{
        int ret;

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

        i915_debugfs_connector_add(connector);

        return ret;
}

static void intel_hdmi_destroy(struct drm_connector *connector)
{
        if (intel_attached_hdmi(connector)->cec_notifier)
                cec_notifier_put(intel_attached_hdmi(connector)->cec_notifier);

        intel_connector_destroy(connector);
}

static const struct drm_connector_funcs intel_hdmi_connector_funcs = {
        .detect = intel_hdmi_detect,
        .force = intel_hdmi_force,
        .fill_modes = drm_helper_probe_single_connector_modes,
        .atomic_get_property = intel_digital_connector_atomic_get_property,
        .atomic_set_property = intel_digital_connector_atomic_set_property,
        .late_register = intel_hdmi_connector_register,
        .early_unregister = intel_connector_unregister,
        .destroy = intel_hdmi_destroy,
        .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
        .atomic_duplicate_state = intel_digital_connector_duplicate_state,
};

static const struct drm_connector_helper_funcs intel_hdmi_connector_helper_funcs = {
        .get_modes = intel_hdmi_get_modes,
        .mode_valid = intel_hdmi_mode_valid,
        .atomic_check = intel_digital_connector_atomic_check,
};

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

static void
intel_hdmi_add_properties(struct intel_hdmi *intel_hdmi, struct drm_connector *connector)
{
        struct drm_i915_private *dev_priv = to_i915(connector->dev);
        struct intel_digital_port *intel_dig_port =
                                hdmi_to_dig_port(intel_hdmi);

        intel_attach_force_audio_property(connector);
        intel_attach_broadcast_rgb_property(connector);
        intel_attach_aspect_ratio_property(connector);

        /*
         * Attach Colorspace property for Non LSPCON based device
         * ToDo: This needs to be extended for LSPCON implementation
         * as well. Will be implemented separately.
         */
        if (!intel_dig_port->lspcon.active)
                intel_attach_colorspace_property(connector);

        drm_connector_attach_content_type_property(connector);
        connector->state->picture_aspect_ratio = HDMI_PICTURE_ASPECT_NONE;

        if (!HAS_GMCH(dev_priv))
                drm_connector_attach_max_bpc_property(connector, 8, 12);
}

/*
 * intel_hdmi_handle_sink_scrambling: handle sink scrambling/clock ratio setup
 * @encoder: intel_encoder
 * @connector: drm_connector
 * @high_tmds_clock_ratio = bool to indicate if the function needs to set
 *  or reset the high tmds clock ratio for scrambling
 * @scrambling: bool to Indicate if the function needs to set or reset
 *  sink scrambling
 *
 * This function handles scrambling on HDMI 2.0 capable sinks.
 * If required clock rate is > 340 Mhz && scrambling is supported by sink
 * it enables scrambling. This should be called before enabling the HDMI
 * 2.0 port, as the sink can choose to disable the scrambling if it doesn't
 * detect a scrambled clock within 100 ms.
 *
 * Returns:
 * True on success, false on failure.
 */
bool intel_hdmi_handle_sink_scrambling(struct intel_encoder *encoder,
                                       struct drm_connector *connector,
                                       bool high_tmds_clock_ratio,
                                       bool scrambling)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base);
        struct drm_scrambling *sink_scrambling =
                &connector->display_info.hdmi.scdc.scrambling;
        struct i2c_adapter *adapter =
                intel_gmbus_get_adapter(dev_priv, intel_hdmi->ddc_bus);

        if (!sink_scrambling->supported)
                return true;

        DRM_DEBUG_KMS("[CONNECTOR:%d:%s] scrambling=%s, TMDS bit clock ratio=1/%d\n",
                      connector->base.id, connector->name,
                      yesno(scrambling), high_tmds_clock_ratio ? 40 : 10);

        /* Set TMDS bit clock ratio to 1/40 or 1/10, and enable/disable scrambling */
        return drm_scdc_set_high_tmds_clock_ratio(adapter,
                                                  high_tmds_clock_ratio) &&
                drm_scdc_set_scrambling(adapter, scrambling);
}

static u8 chv_port_to_ddc_pin(struct drm_i915_private *dev_priv, enum port port)
{
        u8 ddc_pin;

        switch (port) {
        case PORT_B:
                ddc_pin = GMBUS_PIN_DPB;
                break;
        case PORT_C:
                ddc_pin = GMBUS_PIN_DPC;
                break;
        case PORT_D:
                ddc_pin = GMBUS_PIN_DPD_CHV;
                break;
        default:
                MISSING_CASE(port);
                ddc_pin = GMBUS_PIN_DPB;
                break;
        }
        return ddc_pin;
}

static u8 bxt_port_to_ddc_pin(struct drm_i915_private *dev_priv, enum port port)
{
        u8 ddc_pin;

        switch (port) {
        case PORT_B:
                ddc_pin = GMBUS_PIN_1_BXT;
                break;
        case PORT_C:
                ddc_pin = GMBUS_PIN_2_BXT;
                break;
        default:
                MISSING_CASE(port);
                ddc_pin = GMBUS_PIN_1_BXT;
                break;
        }
        return ddc_pin;
}

static u8 cnp_port_to_ddc_pin(struct drm_i915_private *dev_priv,
                              enum port port)
{
        u8 ddc_pin;

        switch (port) {
        case PORT_B:
                ddc_pin = GMBUS_PIN_1_BXT;
                break;
        case PORT_C:
                ddc_pin = GMBUS_PIN_2_BXT;
                break;
        case PORT_D:
                ddc_pin = GMBUS_PIN_4_CNP;
                break;
        case PORT_F:
                ddc_pin = GMBUS_PIN_3_BXT;
                break;
        default:
                MISSING_CASE(port);
                ddc_pin = GMBUS_PIN_1_BXT;
                break;
        }
        return ddc_pin;
}

static u8 icl_port_to_ddc_pin(struct drm_i915_private *dev_priv, enum port port)
{
        u8 ddc_pin;

        switch (port) {
        case PORT_A:
                ddc_pin = GMBUS_PIN_1_BXT;
                break;
        case PORT_B:
                ddc_pin = GMBUS_PIN_2_BXT;
                break;
        case PORT_C:
                ddc_pin = GMBUS_PIN_9_TC1_ICP;
                break;
        case PORT_D:
                ddc_pin = GMBUS_PIN_10_TC2_ICP;
                break;
        case PORT_E:
                ddc_pin = GMBUS_PIN_11_TC3_ICP;
                break;
        case PORT_F:
                ddc_pin = GMBUS_PIN_12_TC4_ICP;
                break;
        default:
                MISSING_CASE(port);
                ddc_pin = GMBUS_PIN_2_BXT;
                break;
        }
        return ddc_pin;
}

static u8 g4x_port_to_ddc_pin(struct drm_i915_private *dev_priv,
                              enum port port)
{
        u8 ddc_pin;

        switch (port) {
        case PORT_B:
                ddc_pin = GMBUS_PIN_DPB;
                break;
        case PORT_C:
                ddc_pin = GMBUS_PIN_DPC;
                break;
        case PORT_D:
                ddc_pin = GMBUS_PIN_DPD;
                break;
        default:
                MISSING_CASE(port);
                ddc_pin = GMBUS_PIN_DPB;
                break;
        }
        return ddc_pin;
}

static u8 intel_hdmi_ddc_pin(struct drm_i915_private *dev_priv,
                             enum port port)
{
        const struct ddi_vbt_port_info *info =
                &dev_priv->vbt.ddi_port_info[port];
        u8 ddc_pin;

        if (info->alternate_ddc_pin) {
                DRM_DEBUG_KMS("Using DDC pin 0x%x for port %c (VBT)\n",
                              info->alternate_ddc_pin, port_name(port));
                return info->alternate_ddc_pin;
        }

        if (HAS_PCH_ICP(dev_priv))
                ddc_pin = icl_port_to_ddc_pin(dev_priv, port);
        else if (HAS_PCH_CNP(dev_priv))
                ddc_pin = cnp_port_to_ddc_pin(dev_priv, port);
        else if (IS_GEN9_LP(dev_priv))
                ddc_pin = bxt_port_to_ddc_pin(dev_priv, port);
        else if (IS_CHERRYVIEW(dev_priv))
                ddc_pin = chv_port_to_ddc_pin(dev_priv, port);
        else
                ddc_pin = g4x_port_to_ddc_pin(dev_priv, port);

        DRM_DEBUG_KMS("Using DDC pin 0x%x for port %c (platform default)\n",
                      ddc_pin, port_name(port));

        return ddc_pin;
}

void intel_infoframe_init(struct intel_digital_port *intel_dig_port)
{
        struct drm_i915_private *dev_priv =
                to_i915(intel_dig_port->base.base.dev);

        if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
                intel_dig_port->write_infoframe = vlv_write_infoframe;
                intel_dig_port->read_infoframe = vlv_read_infoframe;
                intel_dig_port->set_infoframes = vlv_set_infoframes;
                intel_dig_port->infoframes_enabled = vlv_infoframes_enabled;
        } else if (IS_G4X(dev_priv)) {
                intel_dig_port->write_infoframe = g4x_write_infoframe;
                intel_dig_port->read_infoframe = g4x_read_infoframe;
                intel_dig_port->set_infoframes = g4x_set_infoframes;
                intel_dig_port->infoframes_enabled = g4x_infoframes_enabled;
        } else if (HAS_DDI(dev_priv)) {
                if (intel_dig_port->lspcon.active) {
                        intel_dig_port->write_infoframe = lspcon_write_infoframe;
                        intel_dig_port->read_infoframe = lspcon_read_infoframe;
                        intel_dig_port->set_infoframes = lspcon_set_infoframes;
                        intel_dig_port->infoframes_enabled = lspcon_infoframes_enabled;
                } else {
                        intel_dig_port->write_infoframe = hsw_write_infoframe;
                        intel_dig_port->read_infoframe = hsw_read_infoframe;
                        intel_dig_port->set_infoframes = hsw_set_infoframes;
                        intel_dig_port->infoframes_enabled = hsw_infoframes_enabled;
                }
        } else if (HAS_PCH_IBX(dev_priv)) {
                intel_dig_port->write_infoframe = ibx_write_infoframe;
                intel_dig_port->read_infoframe = ibx_read_infoframe;
                intel_dig_port->set_infoframes = ibx_set_infoframes;
                intel_dig_port->infoframes_enabled = ibx_infoframes_enabled;
        } else {
                intel_dig_port->write_infoframe = cpt_write_infoframe;
                intel_dig_port->read_infoframe = cpt_read_infoframe;
                intel_dig_port->set_infoframes = cpt_set_infoframes;
                intel_dig_port->infoframes_enabled = cpt_infoframes_enabled;
        }
}

void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
                               struct intel_connector *intel_connector)
{
        struct drm_connector *connector = &intel_connector->base;
        struct intel_hdmi *intel_hdmi = &intel_dig_port->hdmi;
        struct intel_encoder *intel_encoder = &intel_dig_port->base;
        struct drm_device *dev = intel_encoder->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum port port = intel_encoder->port;

        DRM_DEBUG_KMS("Adding HDMI connector on port %c\n",
                      port_name(port));

        if (WARN(intel_dig_port->max_lanes < 4,
                 "Not enough lanes (%d) for HDMI on port %c\n",
                 intel_dig_port->max_lanes, port_name(port)))
                return;

        drm_connector_init(dev, connector, &intel_hdmi_connector_funcs,
                           DRM_MODE_CONNECTOR_HDMIA);
        drm_connector_helper_add(connector, &intel_hdmi_connector_helper_funcs);

        connector->interlace_allowed = 1;
        connector->doublescan_allowed = 0;
        connector->stereo_allowed = 1;

        if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv))
                connector->ycbcr_420_allowed = true;

        intel_hdmi->ddc_bus = intel_hdmi_ddc_pin(dev_priv, port);

        if (WARN_ON(port == PORT_A))
                return;
        intel_encoder->hpd_pin = intel_hpd_pin_default(dev_priv, port);

        if (HAS_DDI(dev_priv))
                intel_connector->get_hw_state = intel_ddi_connector_get_hw_state;
        else
                intel_connector->get_hw_state = intel_connector_get_hw_state;

        intel_hdmi_add_properties(intel_hdmi, connector);

        intel_connector_attach_encoder(intel_connector, intel_encoder);
        intel_hdmi->attached_connector = intel_connector;

        if (is_hdcp_supported(dev_priv, port)) {
                int ret = intel_hdcp_init(intel_connector,
                                          &intel_hdmi_hdcp_shim);
                if (ret)
                        DRM_DEBUG_KMS("HDCP init failed, skipping.\n");
        }

        /* For G4X desktop chip, PEG_BAND_GAP_DATA 3:0 must first be written
         * 0xd.  Failure to do so will result in spurious interrupts being
         * generated on the port when a cable is not attached.
         */
        if (IS_G45(dev_priv)) {
                u32 temp = I915_READ(PEG_BAND_GAP_DATA);
                I915_WRITE(PEG_BAND_GAP_DATA, (temp & ~0xf) | 0xd);
        }

        intel_hdmi->cec_notifier = cec_notifier_get_conn(dev->dev,
                                                         port_identifier(port));
        if (!intel_hdmi->cec_notifier)
                DRM_DEBUG_KMS("CEC notifier get failed\n");
}

void intel_hdmi_init(struct drm_i915_private *dev_priv,
                     i915_reg_t hdmi_reg, enum port port)
{
        struct intel_digital_port *intel_dig_port;
        struct intel_encoder *intel_encoder;
        struct intel_connector *intel_connector;

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

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

        intel_encoder = &intel_dig_port->base;

        drm_encoder_init(&dev_priv->drm, &intel_encoder->base,
                         &intel_hdmi_enc_funcs, DRM_MODE_ENCODER_TMDS,
                         "HDMI %c", port_name(port));

        intel_encoder->hotplug = intel_encoder_hotplug;
        intel_encoder->compute_config = intel_hdmi_compute_config;
        if (HAS_PCH_SPLIT(dev_priv)) {
                intel_encoder->disable = pch_disable_hdmi;
                intel_encoder->post_disable = pch_post_disable_hdmi;
        } else {
                intel_encoder->disable = g4x_disable_hdmi;
        }
        intel_encoder->get_hw_state = intel_hdmi_get_hw_state;
        intel_encoder->get_config = intel_hdmi_get_config;
        if (IS_CHERRYVIEW(dev_priv)) {
                intel_encoder->pre_pll_enable = chv_hdmi_pre_pll_enable;
                intel_encoder->pre_enable = chv_hdmi_pre_enable;
                intel_encoder->enable = vlv_enable_hdmi;
                intel_encoder->post_disable = chv_hdmi_post_disable;
                intel_encoder->post_pll_disable = chv_hdmi_post_pll_disable;
        } else if (IS_VALLEYVIEW(dev_priv)) {
                intel_encoder->pre_pll_enable = vlv_hdmi_pre_pll_enable;
                intel_encoder->pre_enable = vlv_hdmi_pre_enable;
                intel_encoder->enable = vlv_enable_hdmi;
                intel_encoder->post_disable = vlv_hdmi_post_disable;
        } else {
                intel_encoder->pre_enable = intel_hdmi_pre_enable;
                if (HAS_PCH_CPT(dev_priv))
                        intel_encoder->enable = cpt_enable_hdmi;
                else if (HAS_PCH_IBX(dev_priv))
                        intel_encoder->enable = ibx_enable_hdmi;
                else
                        intel_encoder->enable = g4x_enable_hdmi;
        }

        intel_encoder->type = INTEL_OUTPUT_HDMI;
        intel_encoder->power_domain = intel_port_to_power_domain(port);
        intel_encoder->port = port;
        if (IS_CHERRYVIEW(dev_priv)) {
                if (port == PORT_D)
                        intel_encoder->crtc_mask = 1 << 2;
                else
                        intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
        } else {
                intel_encoder->crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
        }
        intel_encoder->cloneable = 1 << INTEL_OUTPUT_ANALOG;
        /*
         * BSpec is unclear about HDMI+HDMI cloning on g4x, but it seems
         * to work on real hardware. And since g4x can send infoframes to
         * only one port anyway, nothing is lost by allowing it.
         */
        if (IS_G4X(dev_priv))
                intel_encoder->cloneable |= 1 << INTEL_OUTPUT_HDMI;

        intel_dig_port->hdmi.hdmi_reg = hdmi_reg;
        intel_dig_port->dp.output_reg = INVALID_MMIO_REG;
        intel_dig_port->max_lanes = 4;

        intel_infoframe_init(intel_dig_port);

        intel_dig_port->aux_ch = intel_bios_port_aux_ch(dev_priv, port);
        intel_hdmi_init_connector(intel_dig_port, intel_connector);
}