/*
 * Copyright © 2016 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.
 *
 *
 */

#include <drm/drm_atomic_helper.h>
#include <drm/dp/drm_dp_dual_mode_helper.h>
#include <drm/drm_edid.h>

#include "intel_de.h"
#include "intel_display_types.h"
#include "intel_dp.h"
#include "intel_lspcon.h"
#include "intel_hdmi.h"

/* LSPCON OUI Vendor ID(signatures) */
#define LSPCON_VENDOR_PARADE_OUI 0x001CF8
#define LSPCON_VENDOR_MCA_OUI 0x0060AD

#define DPCD_MCA_LSPCON_HDR_STATUS      0x70003
#define DPCD_PARADE_LSPCON_HDR_STATUS   0x00511

/* AUX addresses to write MCA AVI IF */
#define LSPCON_MCA_AVI_IF_WRITE_OFFSET 0x5C0
#define LSPCON_MCA_AVI_IF_CTRL 0x5DF
#define  LSPCON_MCA_AVI_IF_KICKOFF (1 << 0)
#define  LSPCON_MCA_AVI_IF_HANDLED (1 << 1)

/* AUX addresses to write Parade AVI IF */
#define LSPCON_PARADE_AVI_IF_WRITE_OFFSET 0x516
#define LSPCON_PARADE_AVI_IF_CTRL 0x51E
#define  LSPCON_PARADE_AVI_IF_KICKOFF (1 << 7)
#define LSPCON_PARADE_AVI_IF_DATA_SIZE 32

static struct intel_dp *lspcon_to_intel_dp(struct intel_lspcon *lspcon)
{
        struct intel_digital_port *dig_port =
                container_of(lspcon, struct intel_digital_port, lspcon);

        return &dig_port->dp;
}

static const char *lspcon_mode_name(enum drm_lspcon_mode mode)
{
        switch (mode) {
        case DRM_LSPCON_MODE_PCON:
                return "PCON";
        case DRM_LSPCON_MODE_LS:
                return "LS";
        case DRM_LSPCON_MODE_INVALID:
                return "INVALID";
        default:
                MISSING_CASE(mode);
                return "INVALID";
        }
}

static bool lspcon_detect_vendor(struct intel_lspcon *lspcon)
{
        struct intel_dp *dp = lspcon_to_intel_dp(lspcon);
        struct drm_i915_private *i915 = dp_to_i915(dp);
        struct drm_dp_dpcd_ident *ident;
        u32 vendor_oui;

        if (drm_dp_read_desc(&dp->aux, &dp->desc, drm_dp_is_branch(dp->dpcd))) {
                drm_err(&i915->drm, "Can't read description\n");
                return false;
        }

        ident = &dp->desc.ident;
        vendor_oui = (ident->oui[0] << 16) | (ident->oui[1] << 8) |
                      ident->oui[2];

        switch (vendor_oui) {
        case LSPCON_VENDOR_MCA_OUI:
                lspcon->vendor = LSPCON_VENDOR_MCA;
                drm_dbg_kms(&i915->drm, "Vendor: Mega Chips\n");
                break;

        case LSPCON_VENDOR_PARADE_OUI:
                lspcon->vendor = LSPCON_VENDOR_PARADE;
                drm_dbg_kms(&i915->drm, "Vendor: Parade Tech\n");
                break;

        default:
                drm_err(&i915->drm, "Invalid/Unknown vendor OUI\n");
                return false;
        }

        return true;
}

static u32 get_hdr_status_reg(struct intel_lspcon *lspcon)
{
        if (lspcon->vendor == LSPCON_VENDOR_MCA)
                return DPCD_MCA_LSPCON_HDR_STATUS;
        else
                return DPCD_PARADE_LSPCON_HDR_STATUS;
}

void lspcon_detect_hdr_capability(struct intel_lspcon *lspcon)
{
        struct intel_dp *intel_dp = lspcon_to_intel_dp(lspcon);
        struct drm_i915_private *i915 = dp_to_i915(intel_dp);
        u8 hdr_caps;
        int ret;

        ret = drm_dp_dpcd_read(&intel_dp->aux, get_hdr_status_reg(lspcon),
                               &hdr_caps, 1);

        if (ret < 0) {
                drm_dbg_kms(&i915->drm, "HDR capability detection failed\n");
                lspcon->hdr_supported = false;
        } else if (hdr_caps & 0x1) {
                drm_dbg_kms(&i915->drm, "LSPCON capable of HDR\n");
                lspcon->hdr_supported = true;
        }
}

static enum drm_lspcon_mode lspcon_get_current_mode(struct intel_lspcon *lspcon)
{
        struct intel_dp *intel_dp = lspcon_to_intel_dp(lspcon);
        struct drm_i915_private *i915 = dp_to_i915(intel_dp);
        enum drm_lspcon_mode current_mode;
        struct i2c_adapter *adapter = &intel_dp->aux.ddc;

        if (drm_lspcon_get_mode(intel_dp->aux.drm_dev, adapter, &current_mode)) {
                drm_dbg_kms(&i915->drm, "Error reading LSPCON mode\n");
                return DRM_LSPCON_MODE_INVALID;
        }
        return current_mode;
}

static enum drm_lspcon_mode lspcon_wait_mode(struct intel_lspcon *lspcon,
                                             enum drm_lspcon_mode mode)
{
        struct intel_dp *intel_dp = lspcon_to_intel_dp(lspcon);
        struct drm_i915_private *i915 = dp_to_i915(intel_dp);
        enum drm_lspcon_mode current_mode;

        current_mode = lspcon_get_current_mode(lspcon);
        if (current_mode == mode)
                goto out;

        drm_dbg_kms(&i915->drm, "Waiting for LSPCON mode %s to settle\n",
                    lspcon_mode_name(mode));

        wait_for((current_mode = lspcon_get_current_mode(lspcon)) == mode, 400);
        if (current_mode != mode)
                drm_err(&i915->drm, "LSPCON mode hasn't settled\n");

out:
        drm_dbg_kms(&i915->drm, "Current LSPCON mode %s\n",
                    lspcon_mode_name(current_mode));

        return current_mode;
}

static int lspcon_change_mode(struct intel_lspcon *lspcon,
                              enum drm_lspcon_mode mode)
{
        struct intel_dp *intel_dp = lspcon_to_intel_dp(lspcon);
        struct drm_i915_private *i915 = dp_to_i915(intel_dp);
        int err;
        enum drm_lspcon_mode current_mode;
        struct i2c_adapter *adapter = &intel_dp->aux.ddc;

        err = drm_lspcon_get_mode(intel_dp->aux.drm_dev, adapter, &current_mode);
        if (err) {
                drm_err(&i915->drm, "Error reading LSPCON mode\n");
                return err;
        }

        if (current_mode == mode) {
                drm_dbg_kms(&i915->drm, "Current mode = desired LSPCON mode\n");
                return 0;
        }

        err = drm_lspcon_set_mode(intel_dp->aux.drm_dev, adapter, mode);
        if (err < 0) {
                drm_err(&i915->drm, "LSPCON mode change failed\n");
                return err;
        }

        lspcon->mode = mode;
        drm_dbg_kms(&i915->drm, "LSPCON mode changed done\n");
        return 0;
}

static bool lspcon_wake_native_aux_ch(struct intel_lspcon *lspcon)
{
        struct intel_dp *intel_dp = lspcon_to_intel_dp(lspcon);
        struct drm_i915_private *i915 = dp_to_i915(intel_dp);
        u8 rev;

        if (drm_dp_dpcd_readb(&lspcon_to_intel_dp(lspcon)->aux, DP_DPCD_REV,
                              &rev) != 1) {
                drm_dbg_kms(&i915->drm, "Native AUX CH down\n");
                return false;
        }

        drm_dbg_kms(&i915->drm, "Native AUX CH up, DPCD version: %d.%d\n",
                    rev >> 4, rev & 0xf);

        return true;
}

static bool lspcon_probe(struct intel_lspcon *lspcon)
{
        int retry;
        enum drm_dp_dual_mode_type adaptor_type;
        struct intel_dp *intel_dp = lspcon_to_intel_dp(lspcon);
        struct drm_i915_private *i915 = dp_to_i915(intel_dp);
        struct i2c_adapter *adapter = &intel_dp->aux.ddc;
        enum drm_lspcon_mode expected_mode;

        expected_mode = lspcon_wake_native_aux_ch(lspcon) ?
                        DRM_LSPCON_MODE_PCON : DRM_LSPCON_MODE_LS;

        /* Lets probe the adaptor and check its type */
        for (retry = 0; retry < 6; retry++) {
                if (retry)
                        usleep_range(500, 1000);

                adaptor_type = drm_dp_dual_mode_detect(intel_dp->aux.drm_dev, adapter);
                if (adaptor_type == DRM_DP_DUAL_MODE_LSPCON)
                        break;
        }

        if (adaptor_type != DRM_DP_DUAL_MODE_LSPCON) {
                drm_dbg_kms(&i915->drm, "No LSPCON detected, found %s\n",
                            drm_dp_get_dual_mode_type_name(adaptor_type));
                return false;
        }

        /* Yay ... got a LSPCON device */
        drm_dbg_kms(&i915->drm, "LSPCON detected\n");
        lspcon->mode = lspcon_wait_mode(lspcon, expected_mode);

        /*
         * In the SW state machine, lets Put LSPCON in PCON mode only.
         * In this way, it will work with both HDMI 1.4 sinks as well as HDMI
         * 2.0 sinks.
         */
        if (lspcon->mode != DRM_LSPCON_MODE_PCON) {
                if (lspcon_change_mode(lspcon, DRM_LSPCON_MODE_PCON) < 0) {
                        drm_err(&i915->drm, "LSPCON mode change to PCON failed\n");
                        return false;
                }
        }
        return true;
}

static void lspcon_resume_in_pcon_wa(struct intel_lspcon *lspcon)
{
        struct intel_dp *intel_dp = lspcon_to_intel_dp(lspcon);
        struct drm_i915_private *i915 = dp_to_i915(intel_dp);
        struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
        unsigned long start = jiffies;

        while (1) {
                if (intel_digital_port_connected(&dig_port->base)) {
                        drm_dbg_kms(&i915->drm, "LSPCON recovering in PCON mode after %u ms\n",
                                    jiffies_to_msecs(jiffies - start));
                        return;
                }

                if (time_after(jiffies, start + msecs_to_jiffies(1000)))
                        break;

                usleep_range(10000, 15000);
        }

        drm_dbg_kms(&i915->drm, "LSPCON DP descriptor mismatch after resume\n");
}

static bool lspcon_parade_fw_ready(struct drm_dp_aux *aux)
{
        u8 avi_if_ctrl;
        u8 retry;
        ssize_t ret;

        /* Check if LSPCON FW is ready for data */
        for (retry = 0; retry < 5; retry++) {
                if (retry)
                        usleep_range(200, 300);

                ret = drm_dp_dpcd_read(aux, LSPCON_PARADE_AVI_IF_CTRL,
                                       &avi_if_ctrl, 1);
                if (ret < 0) {
                        drm_err(aux->drm_dev, "Failed to read AVI IF control\n");
                        return false;
                }

                if ((avi_if_ctrl & LSPCON_PARADE_AVI_IF_KICKOFF) == 0)
                        return true;
        }

        drm_err(aux->drm_dev, "Parade FW not ready to accept AVI IF\n");
        return false;
}

static bool _lspcon_parade_write_infoframe_blocks(struct drm_dp_aux *aux,
                                                  u8 *avi_buf)
{
        u8 avi_if_ctrl;
        u8 block_count = 0;
        u8 *data;
        u16 reg;
        ssize_t ret;

        while (block_count < 4) {
                if (!lspcon_parade_fw_ready(aux)) {
                        drm_dbg_kms(aux->drm_dev, "LSPCON FW not ready, block %d\n",
                                    block_count);
                        return false;
                }

                reg = LSPCON_PARADE_AVI_IF_WRITE_OFFSET;
                data = avi_buf + block_count * 8;
                ret = drm_dp_dpcd_write(aux, reg, data, 8);
                if (ret < 0) {
                        drm_err(aux->drm_dev, "Failed to write AVI IF block %d\n",
                                block_count);
                        return false;
                }

                /*
                 * Once a block of data is written, we have to inform the FW
                 * about this by writing into avi infoframe control register:
                 * - set the kickoff bit[7] to 1
                 * - write the block no. to bits[1:0]
                 */
                reg = LSPCON_PARADE_AVI_IF_CTRL;
                avi_if_ctrl = LSPCON_PARADE_AVI_IF_KICKOFF | block_count;
                ret = drm_dp_dpcd_write(aux, reg, &avi_if_ctrl, 1);
                if (ret < 0) {
                        drm_err(aux->drm_dev, "Failed to update (0x%x), block %d\n",
                                reg, block_count);
                        return false;
                }

                block_count++;
        }

        drm_dbg_kms(aux->drm_dev, "Wrote AVI IF blocks successfully\n");
        return true;
}

static bool _lspcon_write_avi_infoframe_parade(struct drm_dp_aux *aux,
                                               const u8 *frame,
                                               ssize_t len)
{
        u8 avi_if[LSPCON_PARADE_AVI_IF_DATA_SIZE] = {1, };

        /*
         * Parade's frames contains 32 bytes of data, divided
         * into 4 frames:
         *      Token byte (first byte of first frame, must be non-zero)
         *      HB0 to HB2       from AVI IF (3 bytes header)
         *      PB0 to PB27 from AVI IF (28 bytes data)
         * So it should look like this
         *      first block: | <token> <HB0-HB2> <DB0-DB3> |
         *      next 3 blocks: |<DB4-DB11>|<DB12-DB19>|<DB20-DB28>|
         */

        if (len > LSPCON_PARADE_AVI_IF_DATA_SIZE - 1) {
                drm_err(aux->drm_dev, "Invalid length of infoframes\n");
                return false;
        }

        memcpy(&avi_if[1], frame, len);

        if (!_lspcon_parade_write_infoframe_blocks(aux, avi_if)) {
                drm_dbg_kms(aux->drm_dev, "Failed to write infoframe blocks\n");
                return false;
        }

        return true;
}

static bool _lspcon_write_avi_infoframe_mca(struct drm_dp_aux *aux,
                                            const u8 *buffer, ssize_t len)
{
        int ret;
        u32 val = 0;
        u32 retry;
        u16 reg;
        const u8 *data = buffer;

        reg = LSPCON_MCA_AVI_IF_WRITE_OFFSET;
        while (val < len) {
                /* DPCD write for AVI IF can fail on a slow FW day, so retry */
                for (retry = 0; retry < 5; retry++) {
                        ret = drm_dp_dpcd_write(aux, reg, (void *)data, 1);
                        if (ret == 1) {
                                break;
                        } else if (retry < 4) {
                                mdelay(50);
                                continue;
                        } else {
                                drm_err(aux->drm_dev, "DPCD write failed at:0x%x\n", reg);
                                return false;
                        }
                }
                val++; reg++; data++;
        }

        val = 0;
        reg = LSPCON_MCA_AVI_IF_CTRL;
        ret = drm_dp_dpcd_read(aux, reg, &val, 1);
        if (ret < 0) {
                drm_err(aux->drm_dev, "DPCD read failed, address 0x%x\n", reg);
                return false;
        }

        /* Indicate LSPCON chip about infoframe, clear bit 1 and set bit 0 */
        val &= ~LSPCON_MCA_AVI_IF_HANDLED;
        val |= LSPCON_MCA_AVI_IF_KICKOFF;

        ret = drm_dp_dpcd_write(aux, reg, &val, 1);
        if (ret < 0) {
                drm_err(aux->drm_dev, "DPCD read failed, address 0x%x\n", reg);
                return false;
        }

        val = 0;
        ret = drm_dp_dpcd_read(aux, reg, &val, 1);
        if (ret < 0) {
                drm_err(aux->drm_dev, "DPCD read failed, address 0x%x\n", reg);
                return false;
        }

        if (val == LSPCON_MCA_AVI_IF_HANDLED)
                drm_dbg_kms(aux->drm_dev, "AVI IF handled by FW\n");

        return true;
}

void lspcon_write_infoframe(struct intel_encoder *encoder,
                            const struct intel_crtc_state *crtc_state,
                            unsigned int type,
                            const void *frame, ssize_t len)
{
        bool ret = true;
        struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
        struct drm_i915_private *i915 = dp_to_i915(intel_dp);
        struct intel_lspcon *lspcon = enc_to_intel_lspcon(encoder);

        switch (type) {
        case HDMI_INFOFRAME_TYPE_AVI:
                if (lspcon->vendor == LSPCON_VENDOR_MCA)
                        ret = _lspcon_write_avi_infoframe_mca(&intel_dp->aux,
                                                              frame, len);
                else
                        ret = _lspcon_write_avi_infoframe_parade(&intel_dp->aux,
                                                                 frame, len);
                break;
        case HDMI_PACKET_TYPE_GAMUT_METADATA:
                drm_dbg_kms(&i915->drm, "Update HDR metadata for lspcon\n");
                /* It uses the legacy hsw implementation for the same */
                hsw_write_infoframe(encoder, crtc_state, type, frame, len);
                break;
        default:
                return;
        }

        if (!ret) {
                drm_err(&i915->drm, "Failed to write infoframes\n");
                return;
        }
}

void lspcon_read_infoframe(struct intel_encoder *encoder,
                           const struct intel_crtc_state *crtc_state,
                           unsigned int type,
                           void *frame, ssize_t len)
{
        /* FIXME implement for AVI Infoframe as well */
        if (type == HDMI_PACKET_TYPE_GAMUT_METADATA)
                hsw_read_infoframe(encoder, crtc_state, type,
                                   frame, len);
}

void lspcon_set_infoframes(struct intel_encoder *encoder,
                           bool enable,
                           const struct intel_crtc_state *crtc_state,
                           const struct drm_connector_state *conn_state)
{
        ssize_t ret;
        union hdmi_infoframe frame;
        u8 buf[VIDEO_DIP_DATA_SIZE];
        struct intel_digital_port *dig_port = enc_to_dig_port(encoder);
        struct intel_lspcon *lspcon = &dig_port->lspcon;
        struct drm_i915_private *i915 = to_i915(encoder->base.dev);
        const struct drm_display_mode *adjusted_mode =
                &crtc_state->hw.adjusted_mode;

        if (!lspcon->active) {
                drm_err(&i915->drm, "Writing infoframes while LSPCON disabled ?\n");
                return;
        }

        /* FIXME precompute infoframes */

        ret = drm_hdmi_avi_infoframe_from_display_mode(&frame.avi,
                                                       conn_state->connector,
                                                       adjusted_mode);
        if (ret < 0) {
                drm_err(&i915->drm, "couldn't fill AVI infoframe\n");
                return;
        }

        /*
         * Currently there is no interface defined to
         * check user preference between RGB/YCBCR444
         * or YCBCR420. So the only possible case for
         * YCBCR444 usage is driving YCBCR420 output
         * with LSPCON, when pipe is configured for
         * YCBCR444 output and LSPCON takes care of
         * downsampling it.
         */
        if (crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR444)
                frame.avi.colorspace = HDMI_COLORSPACE_YUV420;
        else
                frame.avi.colorspace = HDMI_COLORSPACE_RGB;

        /* Set the Colorspace as per the HDMI spec */
        drm_hdmi_avi_infoframe_colorimetry(&frame.avi, conn_state);

        /* nonsense combination */
        drm_WARN_ON(encoder->base.dev, crtc_state->limited_color_range &&
                    crtc_state->output_format != INTEL_OUTPUT_FORMAT_RGB);

        if (crtc_state->output_format == INTEL_OUTPUT_FORMAT_RGB) {
                drm_hdmi_avi_infoframe_quant_range(&frame.avi,
                                                   conn_state->connector,
                                                   adjusted_mode,
                                                   crtc_state->limited_color_range ?
                                                   HDMI_QUANTIZATION_RANGE_LIMITED :
                                                   HDMI_QUANTIZATION_RANGE_FULL);
        } else {
                frame.avi.quantization_range = HDMI_QUANTIZATION_RANGE_DEFAULT;
                frame.avi.ycc_quantization_range = HDMI_YCC_QUANTIZATION_RANGE_LIMITED;
        }

        drm_hdmi_avi_infoframe_content_type(&frame.avi, conn_state);

        ret = hdmi_infoframe_pack(&frame, buf, sizeof(buf));
        if (ret < 0) {
                drm_err(&i915->drm, "Failed to pack AVI IF\n");
                return;
        }

        dig_port->write_infoframe(encoder, crtc_state, HDMI_INFOFRAME_TYPE_AVI,
                                  buf, ret);
}

static bool _lspcon_read_avi_infoframe_enabled_mca(struct drm_dp_aux *aux)
{
        int ret;
        u32 val = 0;
        u16 reg = LSPCON_MCA_AVI_IF_CTRL;

        ret = drm_dp_dpcd_read(aux, reg, &val, 1);
        if (ret < 0) {
                drm_err(aux->drm_dev, "DPCD read failed, address 0x%x\n", reg);
                return false;
        }

        return val & LSPCON_MCA_AVI_IF_KICKOFF;
}

static bool _lspcon_read_avi_infoframe_enabled_parade(struct drm_dp_aux *aux)
{
        int ret;
        u32 val = 0;
        u16 reg = LSPCON_PARADE_AVI_IF_CTRL;

        ret = drm_dp_dpcd_read(aux, reg, &val, 1);
        if (ret < 0) {
                drm_err(aux->drm_dev, "DPCD read failed, address 0x%x\n", reg);
                return false;
        }

        return val & LSPCON_PARADE_AVI_IF_KICKOFF;
}

u32 lspcon_infoframes_enabled(struct intel_encoder *encoder,
                              const struct intel_crtc_state *pipe_config)
{
        struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
        struct intel_lspcon *lspcon = enc_to_intel_lspcon(encoder);
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        bool infoframes_enabled;
        u32 val = 0;
        u32 mask, tmp;

        if (lspcon->vendor == LSPCON_VENDOR_MCA)
                infoframes_enabled = _lspcon_read_avi_infoframe_enabled_mca(&intel_dp->aux);
        else
                infoframes_enabled = _lspcon_read_avi_infoframe_enabled_parade(&intel_dp->aux);

        if (infoframes_enabled)
                val |= intel_hdmi_infoframe_enable(HDMI_INFOFRAME_TYPE_AVI);

        if (lspcon->hdr_supported) {
                tmp = intel_de_read(dev_priv,
                                    HSW_TVIDEO_DIP_CTL(pipe_config->cpu_transcoder));
                mask = VIDEO_DIP_ENABLE_GMP_HSW;

                if (tmp & mask)
                        val |= intel_hdmi_infoframe_enable(HDMI_PACKET_TYPE_GAMUT_METADATA);
        }

        return val;
}

void lspcon_wait_pcon_mode(struct intel_lspcon *lspcon)
{
        lspcon_wait_mode(lspcon, DRM_LSPCON_MODE_PCON);
}

bool lspcon_init(struct intel_digital_port *dig_port)
{
        struct intel_dp *intel_dp = &dig_port->dp;
        struct intel_lspcon *lspcon = &dig_port->lspcon;
        struct drm_i915_private *i915 = dp_to_i915(intel_dp);
        struct drm_connector *connector = &intel_dp->attached_connector->base;

        lspcon->active = false;
        lspcon->mode = DRM_LSPCON_MODE_INVALID;

        if (!lspcon_probe(lspcon)) {
                drm_err(&i915->drm, "Failed to probe lspcon\n");
                return false;
        }

        if (drm_dp_read_dpcd_caps(&intel_dp->aux, intel_dp->dpcd) != 0) {
                drm_err(&i915->drm, "LSPCON DPCD read failed\n");
                return false;
        }

        if (!lspcon_detect_vendor(lspcon)) {
                drm_err(&i915->drm, "LSPCON vendor detection failed\n");
                return false;
        }

        connector->ycbcr_420_allowed = true;
        lspcon->active = true;
        drm_dbg_kms(&i915->drm, "Success: LSPCON init\n");
        return true;
}

u32 intel_lspcon_infoframes_enabled(struct intel_encoder *encoder,
                                    const struct intel_crtc_state *pipe_config)
{
        struct intel_digital_port *dig_port = enc_to_dig_port(encoder);

        return dig_port->infoframes_enabled(encoder, pipe_config);
}

void lspcon_resume(struct intel_digital_port *dig_port)
{
        struct intel_lspcon *lspcon = &dig_port->lspcon;
        struct drm_device *dev = dig_port->base.base.dev;
        struct drm_i915_private *i915 = to_i915(dev);
        enum drm_lspcon_mode expected_mode;

        if (!intel_bios_is_lspcon_present(i915, dig_port->base.port))
                return;

        if (!lspcon->active) {
                if (!lspcon_init(dig_port)) {
                        drm_err(&i915->drm, "LSPCON init failed on port %c\n",
                                port_name(dig_port->base.port));
                        return;
                }
        }

        if (lspcon_wake_native_aux_ch(lspcon)) {
                expected_mode = DRM_LSPCON_MODE_PCON;
                lspcon_resume_in_pcon_wa(lspcon);
        } else {
                expected_mode = DRM_LSPCON_MODE_LS;
        }

        if (lspcon_wait_mode(lspcon, expected_mode) == DRM_LSPCON_MODE_PCON)
                return;

        if (lspcon_change_mode(lspcon, DRM_LSPCON_MODE_PCON))
                drm_err(&i915->drm, "LSPCON resume failed\n");
        else
                drm_dbg_kms(&i915->drm, "LSPCON resume success\n");
}