/*
 * Copyright © 2018 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:
 *   Madhav Chauhan <madhav.chauhan@intel.com>
 *   Jani Nikula <jani.nikula@intel.com>
 */

#include <drm/drm_atomic_helper.h>
#include <drm/drm_mipi_dsi.h>

#include "intel_atomic.h"
#include "intel_combo_phy.h"
#include "intel_connector.h"
#include "intel_ddi.h"
#include "intel_dsi.h"
#include "intel_panel.h"
#include "intel_vdsc.h"

static int header_credits_available(struct drm_i915_private *dev_priv,
                                    enum transcoder dsi_trans)
{
        return (intel_de_read(dev_priv, DSI_CMD_TXCTL(dsi_trans)) & FREE_HEADER_CREDIT_MASK)
                >> FREE_HEADER_CREDIT_SHIFT;
}

static int payload_credits_available(struct drm_i915_private *dev_priv,
                                     enum transcoder dsi_trans)
{
        return (intel_de_read(dev_priv, DSI_CMD_TXCTL(dsi_trans)) & FREE_PLOAD_CREDIT_MASK)
                >> FREE_PLOAD_CREDIT_SHIFT;
}

static void wait_for_header_credits(struct drm_i915_private *dev_priv,
                                    enum transcoder dsi_trans)
{
        if (wait_for_us(header_credits_available(dev_priv, dsi_trans) >=
                        MAX_HEADER_CREDIT, 100))
                drm_err(&dev_priv->drm, "DSI header credits not released\n");
}

static void wait_for_payload_credits(struct drm_i915_private *dev_priv,
                                     enum transcoder dsi_trans)
{
        if (wait_for_us(payload_credits_available(dev_priv, dsi_trans) >=
                        MAX_PLOAD_CREDIT, 100))
                drm_err(&dev_priv->drm, "DSI payload credits not released\n");
}

static enum transcoder dsi_port_to_transcoder(enum port port)
{
        if (port == PORT_A)
                return TRANSCODER_DSI_0;
        else
                return TRANSCODER_DSI_1;
}

static void wait_for_cmds_dispatched_to_panel(struct intel_encoder *encoder)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
        struct mipi_dsi_device *dsi;
        enum port port;
        enum transcoder dsi_trans;
        int ret;

        /* wait for header/payload credits to be released */
        for_each_dsi_port(port, intel_dsi->ports) {
                dsi_trans = dsi_port_to_transcoder(port);
                wait_for_header_credits(dev_priv, dsi_trans);
                wait_for_payload_credits(dev_priv, dsi_trans);
        }

        /* send nop DCS command */
        for_each_dsi_port(port, intel_dsi->ports) {
                dsi = intel_dsi->dsi_hosts[port]->device;
                dsi->mode_flags |= MIPI_DSI_MODE_LPM;
                dsi->channel = 0;
                ret = mipi_dsi_dcs_nop(dsi);
                if (ret < 0)
                        drm_err(&dev_priv->drm,
                                "error sending DCS NOP command\n");
        }

        /* wait for header credits to be released */
        for_each_dsi_port(port, intel_dsi->ports) {
                dsi_trans = dsi_port_to_transcoder(port);
                wait_for_header_credits(dev_priv, dsi_trans);
        }

        /* wait for LP TX in progress bit to be cleared */
        for_each_dsi_port(port, intel_dsi->ports) {
                dsi_trans = dsi_port_to_transcoder(port);
                if (wait_for_us(!(intel_de_read(dev_priv, DSI_LP_MSG(dsi_trans)) &
                                  LPTX_IN_PROGRESS), 20))
                        drm_err(&dev_priv->drm, "LPTX bit not cleared\n");
        }
}

static bool add_payld_to_queue(struct intel_dsi_host *host, const u8 *data,
                               u32 len)
{
        struct intel_dsi *intel_dsi = host->intel_dsi;
        struct drm_i915_private *dev_priv = to_i915(intel_dsi->base.base.dev);
        enum transcoder dsi_trans = dsi_port_to_transcoder(host->port);
        int free_credits;
        int i, j;

        for (i = 0; i < len; i += 4) {
                u32 tmp = 0;

                free_credits = payload_credits_available(dev_priv, dsi_trans);
                if (free_credits < 1) {
                        drm_err(&dev_priv->drm,
                                "Payload credit not available\n");
                        return false;
                }

                for (j = 0; j < min_t(u32, len - i, 4); j++)
                        tmp |= *data++ << 8 * j;

                intel_de_write(dev_priv, DSI_CMD_TXPYLD(dsi_trans), tmp);
        }

        return true;
}

static int dsi_send_pkt_hdr(struct intel_dsi_host *host,
                            struct mipi_dsi_packet pkt, bool enable_lpdt)
{
        struct intel_dsi *intel_dsi = host->intel_dsi;
        struct drm_i915_private *dev_priv = to_i915(intel_dsi->base.base.dev);
        enum transcoder dsi_trans = dsi_port_to_transcoder(host->port);
        u32 tmp;
        int free_credits;

        /* check if header credit available */
        free_credits = header_credits_available(dev_priv, dsi_trans);
        if (free_credits < 1) {
                drm_err(&dev_priv->drm,
                        "send pkt header failed, not enough hdr credits\n");
                return -1;
        }

        tmp = intel_de_read(dev_priv, DSI_CMD_TXHDR(dsi_trans));

        if (pkt.payload)
                tmp |= PAYLOAD_PRESENT;
        else
                tmp &= ~PAYLOAD_PRESENT;

        tmp &= ~VBLANK_FENCE;

        if (enable_lpdt)
                tmp |= LP_DATA_TRANSFER;

        tmp &= ~(PARAM_WC_MASK | VC_MASK | DT_MASK);
        tmp |= ((pkt.header[0] & VC_MASK) << VC_SHIFT);
        tmp |= ((pkt.header[0] & DT_MASK) << DT_SHIFT);
        tmp |= (pkt.header[1] << PARAM_WC_LOWER_SHIFT);
        tmp |= (pkt.header[2] << PARAM_WC_UPPER_SHIFT);
        intel_de_write(dev_priv, DSI_CMD_TXHDR(dsi_trans), tmp);

        return 0;
}

static int dsi_send_pkt_payld(struct intel_dsi_host *host,
                              struct mipi_dsi_packet pkt)
{
        struct intel_dsi *intel_dsi = host->intel_dsi;
        struct drm_i915_private *i915 = to_i915(intel_dsi->base.base.dev);

        /* payload queue can accept *256 bytes*, check limit */
        if (pkt.payload_length > MAX_PLOAD_CREDIT * 4) {
                drm_err(&i915->drm, "payload size exceeds max queue limit\n");
                return -1;
        }

        /* load data into command payload queue */
        if (!add_payld_to_queue(host, pkt.payload,
                                pkt.payload_length)) {
                drm_err(&i915->drm, "adding payload to queue failed\n");
                return -1;
        }

        return 0;
}

static void dsi_program_swing_and_deemphasis(struct intel_encoder *encoder)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
        enum phy phy;
        u32 tmp;
        int lane;

        for_each_dsi_phy(phy, intel_dsi->phys) {
                /*
                 * Program voltage swing and pre-emphasis level values as per
                 * table in BSPEC under DDI buffer programing
                 */
                tmp = intel_de_read(dev_priv, ICL_PORT_TX_DW5_LN0(phy));
                tmp &= ~(SCALING_MODE_SEL_MASK | RTERM_SELECT_MASK);
                tmp |= SCALING_MODE_SEL(0x2);
                tmp |= TAP2_DISABLE | TAP3_DISABLE;
                tmp |= RTERM_SELECT(0x6);
                intel_de_write(dev_priv, ICL_PORT_TX_DW5_GRP(phy), tmp);

                tmp = intel_de_read(dev_priv, ICL_PORT_TX_DW5_AUX(phy));
                tmp &= ~(SCALING_MODE_SEL_MASK | RTERM_SELECT_MASK);
                tmp |= SCALING_MODE_SEL(0x2);
                tmp |= TAP2_DISABLE | TAP3_DISABLE;
                tmp |= RTERM_SELECT(0x6);
                intel_de_write(dev_priv, ICL_PORT_TX_DW5_AUX(phy), tmp);

                tmp = intel_de_read(dev_priv, ICL_PORT_TX_DW2_LN0(phy));
                tmp &= ~(SWING_SEL_LOWER_MASK | SWING_SEL_UPPER_MASK |
                         RCOMP_SCALAR_MASK);
                tmp |= SWING_SEL_UPPER(0x2);
                tmp |= SWING_SEL_LOWER(0x2);
                tmp |= RCOMP_SCALAR(0x98);
                intel_de_write(dev_priv, ICL_PORT_TX_DW2_GRP(phy), tmp);

                tmp = intel_de_read(dev_priv, ICL_PORT_TX_DW2_AUX(phy));
                tmp &= ~(SWING_SEL_LOWER_MASK | SWING_SEL_UPPER_MASK |
                         RCOMP_SCALAR_MASK);
                tmp |= SWING_SEL_UPPER(0x2);
                tmp |= SWING_SEL_LOWER(0x2);
                tmp |= RCOMP_SCALAR(0x98);
                intel_de_write(dev_priv, ICL_PORT_TX_DW2_AUX(phy), tmp);

                tmp = intel_de_read(dev_priv, ICL_PORT_TX_DW4_AUX(phy));
                tmp &= ~(POST_CURSOR_1_MASK | POST_CURSOR_2_MASK |
                         CURSOR_COEFF_MASK);
                tmp |= POST_CURSOR_1(0x0);
                tmp |= POST_CURSOR_2(0x0);
                tmp |= CURSOR_COEFF(0x3f);
                intel_de_write(dev_priv, ICL_PORT_TX_DW4_AUX(phy), tmp);

                for (lane = 0; lane <= 3; lane++) {
                        /* Bspec: must not use GRP register for write */
                        tmp = intel_de_read(dev_priv,
                                            ICL_PORT_TX_DW4_LN(lane, phy));
                        tmp &= ~(POST_CURSOR_1_MASK | POST_CURSOR_2_MASK |
                                 CURSOR_COEFF_MASK);
                        tmp |= POST_CURSOR_1(0x0);
                        tmp |= POST_CURSOR_2(0x0);
                        tmp |= CURSOR_COEFF(0x3f);
                        intel_de_write(dev_priv,
                                       ICL_PORT_TX_DW4_LN(lane, phy), tmp);
                }
        }
}

static void configure_dual_link_mode(struct intel_encoder *encoder,
                                     const struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
        u32 dss_ctl1;

        dss_ctl1 = intel_de_read(dev_priv, DSS_CTL1);
        dss_ctl1 |= SPLITTER_ENABLE;
        dss_ctl1 &= ~OVERLAP_PIXELS_MASK;
        dss_ctl1 |= OVERLAP_PIXELS(intel_dsi->pixel_overlap);

        if (intel_dsi->dual_link == DSI_DUAL_LINK_FRONT_BACK) {
                const struct drm_display_mode *adjusted_mode =
                                        &pipe_config->hw.adjusted_mode;
                u32 dss_ctl2;
                u16 hactive = adjusted_mode->crtc_hdisplay;
                u16 dl_buffer_depth;

                dss_ctl1 &= ~DUAL_LINK_MODE_INTERLEAVE;
                dl_buffer_depth = hactive / 2 + intel_dsi->pixel_overlap;

                if (dl_buffer_depth > MAX_DL_BUFFER_TARGET_DEPTH)
                        drm_err(&dev_priv->drm,
                                "DL buffer depth exceed max value\n");

                dss_ctl1 &= ~LEFT_DL_BUF_TARGET_DEPTH_MASK;
                dss_ctl1 |= LEFT_DL_BUF_TARGET_DEPTH(dl_buffer_depth);
                dss_ctl2 = intel_de_read(dev_priv, DSS_CTL2);
                dss_ctl2 &= ~RIGHT_DL_BUF_TARGET_DEPTH_MASK;
                dss_ctl2 |= RIGHT_DL_BUF_TARGET_DEPTH(dl_buffer_depth);
                intel_de_write(dev_priv, DSS_CTL2, dss_ctl2);
        } else {
                /* Interleave */
                dss_ctl1 |= DUAL_LINK_MODE_INTERLEAVE;
        }

        intel_de_write(dev_priv, DSS_CTL1, dss_ctl1);
}

/* aka DSI 8X clock */
static int afe_clk(struct intel_encoder *encoder,
                   const struct intel_crtc_state *crtc_state)
{
        struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
        int bpp;

        if (crtc_state->dsc.compression_enable)
                bpp = crtc_state->dsc.compressed_bpp;
        else
                bpp = mipi_dsi_pixel_format_to_bpp(intel_dsi->pixel_format);

        return DIV_ROUND_CLOSEST(intel_dsi->pclk * bpp, intel_dsi->lane_count);
}

static void gen11_dsi_program_esc_clk_div(struct intel_encoder *encoder,
                                          const struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
        enum port port;
        int afe_clk_khz;
        u32 esc_clk_div_m;

        afe_clk_khz = afe_clk(encoder, crtc_state);
        esc_clk_div_m = DIV_ROUND_UP(afe_clk_khz, DSI_MAX_ESC_CLK);

        for_each_dsi_port(port, intel_dsi->ports) {
                intel_de_write(dev_priv, ICL_DSI_ESC_CLK_DIV(port),
                               esc_clk_div_m & ICL_ESC_CLK_DIV_MASK);
                intel_de_posting_read(dev_priv, ICL_DSI_ESC_CLK_DIV(port));
        }

        for_each_dsi_port(port, intel_dsi->ports) {
                intel_de_write(dev_priv, ICL_DPHY_ESC_CLK_DIV(port),
                               esc_clk_div_m & ICL_ESC_CLK_DIV_MASK);
                intel_de_posting_read(dev_priv, ICL_DPHY_ESC_CLK_DIV(port));
        }
}

static void get_dsi_io_power_domains(struct drm_i915_private *dev_priv,
                                     struct intel_dsi *intel_dsi)
{
        enum port port;

        for_each_dsi_port(port, intel_dsi->ports) {
                drm_WARN_ON(&dev_priv->drm, intel_dsi->io_wakeref[port]);
                intel_dsi->io_wakeref[port] =
                        intel_display_power_get(dev_priv,
                                                port == PORT_A ?
                                                POWER_DOMAIN_PORT_DDI_A_IO :
                                                POWER_DOMAIN_PORT_DDI_B_IO);
        }
}

static void gen11_dsi_enable_io_power(struct intel_encoder *encoder)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
        enum port port;
        u32 tmp;

        for_each_dsi_port(port, intel_dsi->ports) {
                tmp = intel_de_read(dev_priv, ICL_DSI_IO_MODECTL(port));
                tmp |= COMBO_PHY_MODE_DSI;
                intel_de_write(dev_priv, ICL_DSI_IO_MODECTL(port), tmp);
        }

        get_dsi_io_power_domains(dev_priv, intel_dsi);
}

static void gen11_dsi_power_up_lanes(struct intel_encoder *encoder)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
        enum phy phy;

        for_each_dsi_phy(phy, intel_dsi->phys)
                intel_combo_phy_power_up_lanes(dev_priv, phy, true,
                                               intel_dsi->lane_count, false);
}

static void gen11_dsi_config_phy_lanes_sequence(struct intel_encoder *encoder)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
        enum phy phy;
        u32 tmp;
        int lane;

        /* Step 4b(i) set loadgen select for transmit and aux lanes */
        for_each_dsi_phy(phy, intel_dsi->phys) {
                tmp = intel_de_read(dev_priv, ICL_PORT_TX_DW4_AUX(phy));
                tmp &= ~LOADGEN_SELECT;
                intel_de_write(dev_priv, ICL_PORT_TX_DW4_AUX(phy), tmp);
                for (lane = 0; lane <= 3; lane++) {
                        tmp = intel_de_read(dev_priv,
                                            ICL_PORT_TX_DW4_LN(lane, phy));
                        tmp &= ~LOADGEN_SELECT;
                        if (lane != 2)
                                tmp |= LOADGEN_SELECT;
                        intel_de_write(dev_priv,
                                       ICL_PORT_TX_DW4_LN(lane, phy), tmp);
                }
        }

        /* Step 4b(ii) set latency optimization for transmit and aux lanes */
        for_each_dsi_phy(phy, intel_dsi->phys) {
                tmp = intel_de_read(dev_priv, ICL_PORT_TX_DW2_AUX(phy));
                tmp &= ~FRC_LATENCY_OPTIM_MASK;
                tmp |= FRC_LATENCY_OPTIM_VAL(0x5);
                intel_de_write(dev_priv, ICL_PORT_TX_DW2_AUX(phy), tmp);
                tmp = intel_de_read(dev_priv, ICL_PORT_TX_DW2_LN0(phy));
                tmp &= ~FRC_LATENCY_OPTIM_MASK;
                tmp |= FRC_LATENCY_OPTIM_VAL(0x5);
                intel_de_write(dev_priv, ICL_PORT_TX_DW2_GRP(phy), tmp);

                /* For EHL, TGL, set latency optimization for PCS_DW1 lanes */
                if (IS_ELKHARTLAKE(dev_priv) || (INTEL_GEN(dev_priv) >= 12)) {
                        tmp = intel_de_read(dev_priv,
                                            ICL_PORT_PCS_DW1_AUX(phy));
                        tmp &= ~LATENCY_OPTIM_MASK;
                        tmp |= LATENCY_OPTIM_VAL(0);
                        intel_de_write(dev_priv, ICL_PORT_PCS_DW1_AUX(phy),
                                       tmp);

                        tmp = intel_de_read(dev_priv,
                                            ICL_PORT_PCS_DW1_LN0(phy));
                        tmp &= ~LATENCY_OPTIM_MASK;
                        tmp |= LATENCY_OPTIM_VAL(0x1);
                        intel_de_write(dev_priv, ICL_PORT_PCS_DW1_GRP(phy),
                                       tmp);
                }
        }

}

static void gen11_dsi_voltage_swing_program_seq(struct intel_encoder *encoder)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
        u32 tmp;
        enum phy phy;

        /* clear common keeper enable bit */
        for_each_dsi_phy(phy, intel_dsi->phys) {
                tmp = intel_de_read(dev_priv, ICL_PORT_PCS_DW1_LN0(phy));
                tmp &= ~COMMON_KEEPER_EN;
                intel_de_write(dev_priv, ICL_PORT_PCS_DW1_GRP(phy), tmp);
                tmp = intel_de_read(dev_priv, ICL_PORT_PCS_DW1_AUX(phy));
                tmp &= ~COMMON_KEEPER_EN;
                intel_de_write(dev_priv, ICL_PORT_PCS_DW1_AUX(phy), tmp);
        }

        /*
         * Set SUS Clock Config bitfield to 11b
         * Note: loadgen select program is done
         * as part of lane phy sequence configuration
         */
        for_each_dsi_phy(phy, intel_dsi->phys) {
                tmp = intel_de_read(dev_priv, ICL_PORT_CL_DW5(phy));
                tmp |= SUS_CLOCK_CONFIG;
                intel_de_write(dev_priv, ICL_PORT_CL_DW5(phy), tmp);
        }

        /* Clear training enable to change swing values */
        for_each_dsi_phy(phy, intel_dsi->phys) {
                tmp = intel_de_read(dev_priv, ICL_PORT_TX_DW5_LN0(phy));
                tmp &= ~TX_TRAINING_EN;
                intel_de_write(dev_priv, ICL_PORT_TX_DW5_GRP(phy), tmp);
                tmp = intel_de_read(dev_priv, ICL_PORT_TX_DW5_AUX(phy));
                tmp &= ~TX_TRAINING_EN;
                intel_de_write(dev_priv, ICL_PORT_TX_DW5_AUX(phy), tmp);
        }

        /* Program swing and de-emphasis */
        dsi_program_swing_and_deemphasis(encoder);

        /* Set training enable to trigger update */
        for_each_dsi_phy(phy, intel_dsi->phys) {
                tmp = intel_de_read(dev_priv, ICL_PORT_TX_DW5_LN0(phy));
                tmp |= TX_TRAINING_EN;
                intel_de_write(dev_priv, ICL_PORT_TX_DW5_GRP(phy), tmp);
                tmp = intel_de_read(dev_priv, ICL_PORT_TX_DW5_AUX(phy));
                tmp |= TX_TRAINING_EN;
                intel_de_write(dev_priv, ICL_PORT_TX_DW5_AUX(phy), tmp);
        }
}

static void gen11_dsi_enable_ddi_buffer(struct intel_encoder *encoder)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
        u32 tmp;
        enum port port;

        for_each_dsi_port(port, intel_dsi->ports) {
                tmp = intel_de_read(dev_priv, DDI_BUF_CTL(port));
                tmp |= DDI_BUF_CTL_ENABLE;
                intel_de_write(dev_priv, DDI_BUF_CTL(port), tmp);

                if (wait_for_us(!(intel_de_read(dev_priv, DDI_BUF_CTL(port)) &
                                  DDI_BUF_IS_IDLE),
                                  500))
                        drm_err(&dev_priv->drm, "DDI port:%c buffer idle\n",
                                port_name(port));
        }
}

static void
gen11_dsi_setup_dphy_timings(struct intel_encoder *encoder,
                             const struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
        u32 tmp;
        enum port port;
        enum phy phy;

        /* Program T-INIT master registers */
        for_each_dsi_port(port, intel_dsi->ports) {
                tmp = intel_de_read(dev_priv, ICL_DSI_T_INIT_MASTER(port));
                tmp &= ~MASTER_INIT_TIMER_MASK;
                tmp |= intel_dsi->init_count;
                intel_de_write(dev_priv, ICL_DSI_T_INIT_MASTER(port), tmp);
        }

        /* Program DPHY clock lanes timings */
        for_each_dsi_port(port, intel_dsi->ports) {
                intel_de_write(dev_priv, DPHY_CLK_TIMING_PARAM(port),
                               intel_dsi->dphy_reg);

                /* shadow register inside display core */
                intel_de_write(dev_priv, DSI_CLK_TIMING_PARAM(port),
                               intel_dsi->dphy_reg);
        }

        /* Program DPHY data lanes timings */
        for_each_dsi_port(port, intel_dsi->ports) {
                intel_de_write(dev_priv, DPHY_DATA_TIMING_PARAM(port),
                               intel_dsi->dphy_data_lane_reg);

                /* shadow register inside display core */
                intel_de_write(dev_priv, DSI_DATA_TIMING_PARAM(port),
                               intel_dsi->dphy_data_lane_reg);
        }

        /*
         * If DSI link operating at or below an 800 MHz,
         * TA_SURE should be override and programmed to
         * a value '0' inside TA_PARAM_REGISTERS otherwise
         * leave all fields at HW default values.
         */
        if (IS_GEN(dev_priv, 11)) {
                if (afe_clk(encoder, crtc_state) <= 800000) {
                        for_each_dsi_port(port, intel_dsi->ports) {
                                tmp = intel_de_read(dev_priv,
                                                    DPHY_TA_TIMING_PARAM(port));
                                tmp &= ~TA_SURE_MASK;
                                tmp |= TA_SURE_OVERRIDE | TA_SURE(0);
                                intel_de_write(dev_priv,
                                               DPHY_TA_TIMING_PARAM(port),
                                               tmp);

                                /* shadow register inside display core */
                                tmp = intel_de_read(dev_priv,
                                                    DSI_TA_TIMING_PARAM(port));
                                tmp &= ~TA_SURE_MASK;
                                tmp |= TA_SURE_OVERRIDE | TA_SURE(0);
                                intel_de_write(dev_priv,
                                               DSI_TA_TIMING_PARAM(port), tmp);
                        }
                }
        }

        if (IS_ELKHARTLAKE(dev_priv)) {
                for_each_dsi_phy(phy, intel_dsi->phys) {
                        tmp = intel_de_read(dev_priv, ICL_DPHY_CHKN(phy));
                        tmp |= ICL_DPHY_CHKN_AFE_OVER_PPI_STRAP;
                        intel_de_write(dev_priv, ICL_DPHY_CHKN(phy), tmp);
                }
        }
}

static void gen11_dsi_gate_clocks(struct intel_encoder *encoder)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
        u32 tmp;
        enum phy phy;

        mutex_lock(&dev_priv->dpll.lock);
        tmp = intel_de_read(dev_priv, ICL_DPCLKA_CFGCR0);
        for_each_dsi_phy(phy, intel_dsi->phys)
                tmp |= ICL_DPCLKA_CFGCR0_DDI_CLK_OFF(phy);

        intel_de_write(dev_priv, ICL_DPCLKA_CFGCR0, tmp);
        mutex_unlock(&dev_priv->dpll.lock);
}

static void gen11_dsi_ungate_clocks(struct intel_encoder *encoder)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
        u32 tmp;
        enum phy phy;

        mutex_lock(&dev_priv->dpll.lock);
        tmp = intel_de_read(dev_priv, ICL_DPCLKA_CFGCR0);
        for_each_dsi_phy(phy, intel_dsi->phys)
                tmp &= ~ICL_DPCLKA_CFGCR0_DDI_CLK_OFF(phy);

        intel_de_write(dev_priv, ICL_DPCLKA_CFGCR0, tmp);
        mutex_unlock(&dev_priv->dpll.lock);
}

static void gen11_dsi_map_pll(struct intel_encoder *encoder,
                              const struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
        struct intel_shared_dpll *pll = crtc_state->shared_dpll;
        enum phy phy;
        u32 val;

        mutex_lock(&dev_priv->dpll.lock);

        val = intel_de_read(dev_priv, ICL_DPCLKA_CFGCR0);
        for_each_dsi_phy(phy, intel_dsi->phys) {
                val &= ~ICL_DPCLKA_CFGCR0_DDI_CLK_SEL_MASK(phy);
                val |= ICL_DPCLKA_CFGCR0_DDI_CLK_SEL(pll->info->id, phy);
        }
        intel_de_write(dev_priv, ICL_DPCLKA_CFGCR0, val);

        for_each_dsi_phy(phy, intel_dsi->phys) {
                if (INTEL_GEN(dev_priv) >= 12)
                        val |= ICL_DPCLKA_CFGCR0_DDI_CLK_OFF(phy);
                else
                        val &= ~ICL_DPCLKA_CFGCR0_DDI_CLK_OFF(phy);
        }
        intel_de_write(dev_priv, ICL_DPCLKA_CFGCR0, val);

        intel_de_posting_read(dev_priv, ICL_DPCLKA_CFGCR0);

        mutex_unlock(&dev_priv->dpll.lock);
}

static void
gen11_dsi_configure_transcoder(struct intel_encoder *encoder,
                               const struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
        struct intel_crtc *intel_crtc = to_intel_crtc(pipe_config->uapi.crtc);
        enum pipe pipe = intel_crtc->pipe;
        u32 tmp;
        enum port port;
        enum transcoder dsi_trans;

        for_each_dsi_port(port, intel_dsi->ports) {
                dsi_trans = dsi_port_to_transcoder(port);
                tmp = intel_de_read(dev_priv, DSI_TRANS_FUNC_CONF(dsi_trans));

                if (intel_dsi->eotp_pkt)
                        tmp &= ~EOTP_DISABLED;
                else
                        tmp |= EOTP_DISABLED;

                /* enable link calibration if freq > 1.5Gbps */
                if (afe_clk(encoder, pipe_config) >= 1500 * 1000) {
                        tmp &= ~LINK_CALIBRATION_MASK;
                        tmp |= CALIBRATION_ENABLED_INITIAL_ONLY;
                }

                /* configure continuous clock */
                tmp &= ~CONTINUOUS_CLK_MASK;
                if (intel_dsi->clock_stop)
                        tmp |= CLK_ENTER_LP_AFTER_DATA;
                else
                        tmp |= CLK_HS_CONTINUOUS;

                /* configure buffer threshold limit to minimum */
                tmp &= ~PIX_BUF_THRESHOLD_MASK;
                tmp |= PIX_BUF_THRESHOLD_1_4;

                /* set virtual channel to '0' */
                tmp &= ~PIX_VIRT_CHAN_MASK;
                tmp |= PIX_VIRT_CHAN(0);

                /* program BGR transmission */
                if (intel_dsi->bgr_enabled)
                        tmp |= BGR_TRANSMISSION;

                /* select pixel format */
                tmp &= ~PIX_FMT_MASK;
                if (pipe_config->dsc.compression_enable) {
                        tmp |= PIX_FMT_COMPRESSED;
                } else {
                        switch (intel_dsi->pixel_format) {
                        default:
                                MISSING_CASE(intel_dsi->pixel_format);
                                fallthrough;
                        case MIPI_DSI_FMT_RGB565:
                                tmp |= PIX_FMT_RGB565;
                                break;
                        case MIPI_DSI_FMT_RGB666_PACKED:
                                tmp |= PIX_FMT_RGB666_PACKED;
                                break;
                        case MIPI_DSI_FMT_RGB666:
                                tmp |= PIX_FMT_RGB666_LOOSE;
                                break;
                        case MIPI_DSI_FMT_RGB888:
                                tmp |= PIX_FMT_RGB888;
                                break;
                        }
                }

                if (INTEL_GEN(dev_priv) >= 12) {
                        if (is_vid_mode(intel_dsi))
                                tmp |= BLANKING_PACKET_ENABLE;
                }

                /* program DSI operation mode */
                if (is_vid_mode(intel_dsi)) {
                        tmp &= ~OP_MODE_MASK;
                        switch (intel_dsi->video_mode_format) {
                        default:
                                MISSING_CASE(intel_dsi->video_mode_format);
                                fallthrough;
                        case VIDEO_MODE_NON_BURST_WITH_SYNC_EVENTS:
                                tmp |= VIDEO_MODE_SYNC_EVENT;
                                break;
                        case VIDEO_MODE_NON_BURST_WITH_SYNC_PULSE:
                                tmp |= VIDEO_MODE_SYNC_PULSE;
                                break;
                        }
                } else {
                        /*
                         * FIXME: Retrieve this info from VBT.
                         * As per the spec when dsi transcoder is operating
                         * in TE GATE mode, TE comes from GPIO
                         * which is UTIL PIN for DSI 0.
                         * Also this GPIO would not be used for other
                         * purposes is an assumption.
                         */
                        tmp &= ~OP_MODE_MASK;
                        tmp |= CMD_MODE_TE_GATE;
                        tmp |= TE_SOURCE_GPIO;
                }

                intel_de_write(dev_priv, DSI_TRANS_FUNC_CONF(dsi_trans), tmp);
        }

        /* enable port sync mode if dual link */
        if (intel_dsi->dual_link) {
                for_each_dsi_port(port, intel_dsi->ports) {
                        dsi_trans = dsi_port_to_transcoder(port);
                        tmp = intel_de_read(dev_priv,
                                            TRANS_DDI_FUNC_CTL2(dsi_trans));
                        tmp |= PORT_SYNC_MODE_ENABLE;
                        intel_de_write(dev_priv,
                                       TRANS_DDI_FUNC_CTL2(dsi_trans), tmp);
                }

                /* configure stream splitting */
                configure_dual_link_mode(encoder, pipe_config);
        }

        for_each_dsi_port(port, intel_dsi->ports) {
                dsi_trans = dsi_port_to_transcoder(port);

                /* select data lane width */
                tmp = intel_de_read(dev_priv, TRANS_DDI_FUNC_CTL(dsi_trans));
                tmp &= ~DDI_PORT_WIDTH_MASK;
                tmp |= DDI_PORT_WIDTH(intel_dsi->lane_count);

                /* select input pipe */
                tmp &= ~TRANS_DDI_EDP_INPUT_MASK;
                switch (pipe) {
                default:
                        MISSING_CASE(pipe);
                        fallthrough;
                case PIPE_A:
                        tmp |= TRANS_DDI_EDP_INPUT_A_ON;
                        break;
                case PIPE_B:
                        tmp |= TRANS_DDI_EDP_INPUT_B_ONOFF;
                        break;
                case PIPE_C:
                        tmp |= TRANS_DDI_EDP_INPUT_C_ONOFF;
                        break;
                case PIPE_D:
                        tmp |= TRANS_DDI_EDP_INPUT_D_ONOFF;
                        break;
                }

                /* enable DDI buffer */
                tmp |= TRANS_DDI_FUNC_ENABLE;
                intel_de_write(dev_priv, TRANS_DDI_FUNC_CTL(dsi_trans), tmp);
        }

        /* wait for link ready */
        for_each_dsi_port(port, intel_dsi->ports) {
                dsi_trans = dsi_port_to_transcoder(port);
                if (wait_for_us((intel_de_read(dev_priv, DSI_TRANS_FUNC_CONF(dsi_trans)) &
                                 LINK_READY), 2500))
                        drm_err(&dev_priv->drm, "DSI link not ready\n");
        }
}

static void
gen11_dsi_set_transcoder_timings(struct intel_encoder *encoder,
                                 const struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
        const struct drm_display_mode *adjusted_mode =
                &crtc_state->hw.adjusted_mode;
        enum port port;
        enum transcoder dsi_trans;
        /* horizontal timings */
        u16 htotal, hactive, hsync_start, hsync_end, hsync_size;
        u16 hback_porch;
        /* vertical timings */
        u16 vtotal, vactive, vsync_start, vsync_end, vsync_shift;
        int mul = 1, div = 1;

        /*
         * Adjust horizontal timings (htotal, hsync_start, hsync_end) to account
         * for slower link speed if DSC is enabled.
         *
         * The compression frequency ratio is the ratio between compressed and
         * non-compressed link speeds, and simplifies down to the ratio between
         * compressed and non-compressed bpp.
         */
        if (crtc_state->dsc.compression_enable) {
                mul = crtc_state->dsc.compressed_bpp;
                div = mipi_dsi_pixel_format_to_bpp(intel_dsi->pixel_format);
        }

        hactive = adjusted_mode->crtc_hdisplay;

        if (is_vid_mode(intel_dsi))
                htotal = DIV_ROUND_UP(adjusted_mode->crtc_htotal * mul, div);
        else
                htotal = DIV_ROUND_UP((hactive + 160) * mul, div);

        hsync_start = DIV_ROUND_UP(adjusted_mode->crtc_hsync_start * mul, div);
        hsync_end = DIV_ROUND_UP(adjusted_mode->crtc_hsync_end * mul, div);
        hsync_size  = hsync_end - hsync_start;
        hback_porch = (adjusted_mode->crtc_htotal -
                       adjusted_mode->crtc_hsync_end);
        vactive = adjusted_mode->crtc_vdisplay;

        if (is_vid_mode(intel_dsi)) {
                vtotal = adjusted_mode->crtc_vtotal;
        } else {
                int bpp, line_time_us, byte_clk_period_ns;

                if (crtc_state->dsc.compression_enable)
                        bpp = crtc_state->dsc.compressed_bpp;
                else
                        bpp = mipi_dsi_pixel_format_to_bpp(intel_dsi->pixel_format);

                byte_clk_period_ns = 1000000 / afe_clk(encoder, crtc_state);
                line_time_us = (htotal * (bpp / 8) * byte_clk_period_ns) / (1000 * intel_dsi->lane_count);
                vtotal = vactive + DIV_ROUND_UP(400, line_time_us);
        }
        vsync_start = adjusted_mode->crtc_vsync_start;
        vsync_end = adjusted_mode->crtc_vsync_end;
        vsync_shift = hsync_start - htotal / 2;

        if (intel_dsi->dual_link) {
                hactive /= 2;
                if (intel_dsi->dual_link == DSI_DUAL_LINK_FRONT_BACK)
                        hactive += intel_dsi->pixel_overlap;
                htotal /= 2;
        }

        /* minimum hactive as per bspec: 256 pixels */
        if (adjusted_mode->crtc_hdisplay < 256)
                drm_err(&dev_priv->drm, "hactive is less then 256 pixels\n");

        /* if RGB666 format, then hactive must be multiple of 4 pixels */
        if (intel_dsi->pixel_format == MIPI_DSI_FMT_RGB666 && hactive % 4 != 0)
                drm_err(&dev_priv->drm,
                        "hactive pixels are not multiple of 4\n");

        /* program TRANS_HTOTAL register */
        for_each_dsi_port(port, intel_dsi->ports) {
                dsi_trans = dsi_port_to_transcoder(port);
                intel_de_write(dev_priv, HTOTAL(dsi_trans),
                               (hactive - 1) | ((htotal - 1) << 16));
        }

        /* TRANS_HSYNC register to be programmed only for video mode */
        if (is_vid_mode(intel_dsi)) {
                if (intel_dsi->video_mode_format ==
                    VIDEO_MODE_NON_BURST_WITH_SYNC_PULSE) {
                        /* BSPEC: hsync size should be atleast 16 pixels */
                        if (hsync_size < 16)
                                drm_err(&dev_priv->drm,
                                        "hsync size < 16 pixels\n");
                }

                if (hback_porch < 16)
                        drm_err(&dev_priv->drm, "hback porch < 16 pixels\n");

                if (intel_dsi->dual_link) {
                        hsync_start /= 2;
                        hsync_end /= 2;
                }

                for_each_dsi_port(port, intel_dsi->ports) {
                        dsi_trans = dsi_port_to_transcoder(port);
                        intel_de_write(dev_priv, HSYNC(dsi_trans),
                                       (hsync_start - 1) | ((hsync_end - 1) << 16));
                }
        }

        /* program TRANS_VTOTAL register */
        for_each_dsi_port(port, intel_dsi->ports) {
                dsi_trans = dsi_port_to_transcoder(port);
                /*
                 * FIXME: Programing this by assuming progressive mode, since
                 * non-interlaced info from VBT is not saved inside
                 * struct drm_display_mode.
                 * For interlace mode: program required pixel minus 2
                 */
                intel_de_write(dev_priv, VTOTAL(dsi_trans),
                               (vactive - 1) | ((vtotal - 1) << 16));
        }

        if (vsync_end < vsync_start || vsync_end > vtotal)
                drm_err(&dev_priv->drm, "Invalid vsync_end value\n");

        if (vsync_start < vactive)
                drm_err(&dev_priv->drm, "vsync_start less than vactive\n");

        /* program TRANS_VSYNC register for video mode only */
        if (is_vid_mode(intel_dsi)) {
                for_each_dsi_port(port, intel_dsi->ports) {
                        dsi_trans = dsi_port_to_transcoder(port);
                        intel_de_write(dev_priv, VSYNC(dsi_trans),
                                       (vsync_start - 1) | ((vsync_end - 1) << 16));
                }
        }

        /*
         * FIXME: It has to be programmed only for video modes and interlaced
         * modes. Put the check condition here once interlaced
         * info available as described above.
         * program TRANS_VSYNCSHIFT register
         */
        if (is_vid_mode(intel_dsi)) {
                for_each_dsi_port(port, intel_dsi->ports) {
                        dsi_trans = dsi_port_to_transcoder(port);
                        intel_de_write(dev_priv, VSYNCSHIFT(dsi_trans),
                                       vsync_shift);
                }
        }

        /* program TRANS_VBLANK register, should be same as vtotal programmed */
        if (INTEL_GEN(dev_priv) >= 12) {
                for_each_dsi_port(port, intel_dsi->ports) {
                        dsi_trans = dsi_port_to_transcoder(port);
                        intel_de_write(dev_priv, VBLANK(dsi_trans),
                                       (vactive - 1) | ((vtotal - 1) << 16));
                }
        }
}

static void gen11_dsi_enable_transcoder(struct intel_encoder *encoder)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
        enum port port;
        enum transcoder dsi_trans;
        u32 tmp;

        for_each_dsi_port(port, intel_dsi->ports) {
                dsi_trans = dsi_port_to_transcoder(port);
                tmp = intel_de_read(dev_priv, PIPECONF(dsi_trans));
                tmp |= PIPECONF_ENABLE;
                intel_de_write(dev_priv, PIPECONF(dsi_trans), tmp);

                /* wait for transcoder to be enabled */

                if (intel_de_wait_for_set(dev_priv, PIPECONF(dsi_trans),
                                          I965_PIPECONF_ACTIVE, 10))
                        drm_err(&dev_priv->drm,
                                "DSI transcoder not enabled\n");
        }
}

static void gen11_dsi_setup_timeouts(struct intel_encoder *encoder,
                                     const struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
        enum port port;
        enum transcoder dsi_trans;
        u32 tmp, hs_tx_timeout, lp_rx_timeout, ta_timeout, divisor, mul;

        /*
         * escape clock count calculation:
         * BYTE_CLK_COUNT = TIME_NS/(8 * UI)
         * UI (nsec) = (10^6)/Bitrate
         * TIME_NS = (BYTE_CLK_COUNT * 8 * 10^6)/ Bitrate
         * ESCAPE_CLK_COUNT  = TIME_NS/ESC_CLK_NS
         */
        divisor = intel_dsi_tlpx_ns(intel_dsi) * afe_clk(encoder, crtc_state) * 1000;
        mul = 8 * 1000000;
        hs_tx_timeout = DIV_ROUND_UP(intel_dsi->hs_tx_timeout * mul,
                                     divisor);
        lp_rx_timeout = DIV_ROUND_UP(intel_dsi->lp_rx_timeout * mul, divisor);
        ta_timeout = DIV_ROUND_UP(intel_dsi->turn_arnd_val * mul, divisor);

        for_each_dsi_port(port, intel_dsi->ports) {
                dsi_trans = dsi_port_to_transcoder(port);

                /* program hst_tx_timeout */
                tmp = intel_de_read(dev_priv, DSI_HSTX_TO(dsi_trans));
                tmp &= ~HSTX_TIMEOUT_VALUE_MASK;
                tmp |= HSTX_TIMEOUT_VALUE(hs_tx_timeout);
                intel_de_write(dev_priv, DSI_HSTX_TO(dsi_trans), tmp);

                /* FIXME: DSI_CALIB_TO */

                /* program lp_rx_host timeout */
                tmp = intel_de_read(dev_priv, DSI_LPRX_HOST_TO(dsi_trans));
                tmp &= ~LPRX_TIMEOUT_VALUE_MASK;
                tmp |= LPRX_TIMEOUT_VALUE(lp_rx_timeout);
                intel_de_write(dev_priv, DSI_LPRX_HOST_TO(dsi_trans), tmp);

                /* FIXME: DSI_PWAIT_TO */

                /* program turn around timeout */
                tmp = intel_de_read(dev_priv, DSI_TA_TO(dsi_trans));
                tmp &= ~TA_TIMEOUT_VALUE_MASK;
                tmp |= TA_TIMEOUT_VALUE(ta_timeout);
                intel_de_write(dev_priv, DSI_TA_TO(dsi_trans), tmp);
        }
}

static void gen11_dsi_config_util_pin(struct intel_encoder *encoder,
                                      bool enable)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
        u32 tmp;

        /*
         * used as TE i/p for DSI0,
         * for dual link/DSI1 TE is from slave DSI1
         * through GPIO.
         */
        if (is_vid_mode(intel_dsi) || (intel_dsi->ports & BIT(PORT_B)))
                return;

        tmp = intel_de_read(dev_priv, UTIL_PIN_CTL);

        if (enable) {
                tmp |= UTIL_PIN_DIRECTION_INPUT;
                tmp |= UTIL_PIN_ENABLE;
        } else {
                tmp &= ~UTIL_PIN_ENABLE;
        }
        intel_de_write(dev_priv, UTIL_PIN_CTL, tmp);
}

static void
gen11_dsi_enable_port_and_phy(struct intel_encoder *encoder,
                              const struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);

        /* step 4a: power up all lanes of the DDI used by DSI */
        gen11_dsi_power_up_lanes(encoder);

        /* step 4b: configure lane sequencing of the Combo-PHY transmitters */
        gen11_dsi_config_phy_lanes_sequence(encoder);

        /* step 4c: configure voltage swing and skew */
        gen11_dsi_voltage_swing_program_seq(encoder);

        /* enable DDI buffer */
        gen11_dsi_enable_ddi_buffer(encoder);

        /* setup D-PHY timings */
        gen11_dsi_setup_dphy_timings(encoder, crtc_state);

        /* Since transcoder is configured to take events from GPIO */
        gen11_dsi_config_util_pin(encoder, true);

        /* step 4h: setup DSI protocol timeouts */
        gen11_dsi_setup_timeouts(encoder, crtc_state);

        /* Step (4h, 4i, 4j, 4k): Configure transcoder */
        gen11_dsi_configure_transcoder(encoder, crtc_state);

        /* Step 4l: Gate DDI clocks */
        if (IS_GEN(dev_priv, 11))
                gen11_dsi_gate_clocks(encoder);
}

static void gen11_dsi_powerup_panel(struct intel_encoder *encoder)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
        struct mipi_dsi_device *dsi;
        enum port port;
        enum transcoder dsi_trans;
        u32 tmp;
        int ret;

        /* set maximum return packet size */
        for_each_dsi_port(port, intel_dsi->ports) {
                dsi_trans = dsi_port_to_transcoder(port);

                /*
                 * FIXME: This uses the number of DW's currently in the payload
                 * receive queue. This is probably not what we want here.
                 */
                tmp = intel_de_read(dev_priv, DSI_CMD_RXCTL(dsi_trans));
                tmp &= NUMBER_RX_PLOAD_DW_MASK;
                /* multiply "Number Rx Payload DW" by 4 to get max value */
                tmp = tmp * 4;
                dsi = intel_dsi->dsi_hosts[port]->device;
                ret = mipi_dsi_set_maximum_return_packet_size(dsi, tmp);
                if (ret < 0)
                        drm_err(&dev_priv->drm,
                                "error setting max return pkt size%d\n", tmp);
        }

        /* panel power on related mipi dsi vbt sequences */
        intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_POWER_ON);
        intel_dsi_msleep(intel_dsi, intel_dsi->panel_on_delay);
        intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_DEASSERT_RESET);
        intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_INIT_OTP);
        intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_DISPLAY_ON);

        /* ensure all panel commands dispatched before enabling transcoder */
        wait_for_cmds_dispatched_to_panel(encoder);
}

static void gen11_dsi_pre_pll_enable(struct intel_atomic_state *state,
                                     struct intel_encoder *encoder,
                                     const struct intel_crtc_state *crtc_state,
                                     const struct drm_connector_state *conn_state)
{
        /* step2: enable IO power */
        gen11_dsi_enable_io_power(encoder);

        /* step3: enable DSI PLL */
        gen11_dsi_program_esc_clk_div(encoder, crtc_state);
}

static void gen11_dsi_pre_enable(struct intel_atomic_state *state,
                                 struct intel_encoder *encoder,
                                 const struct intel_crtc_state *pipe_config,
                                 const struct drm_connector_state *conn_state)
{
        /* step3b */
        gen11_dsi_map_pll(encoder, pipe_config);

        /* step4: enable DSI port and DPHY */
        gen11_dsi_enable_port_and_phy(encoder, pipe_config);

        /* step5: program and powerup panel */
        gen11_dsi_powerup_panel(encoder);

        intel_dsc_enable(encoder, pipe_config);

        /* step6c: configure transcoder timings */
        gen11_dsi_set_transcoder_timings(encoder, pipe_config);
}

static void gen11_dsi_enable(struct intel_atomic_state *state,
                             struct intel_encoder *encoder,
                             const struct intel_crtc_state *crtc_state,
                             const struct drm_connector_state *conn_state)
{
        struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);

        drm_WARN_ON(state->base.dev, crtc_state->has_pch_encoder);

        /* step6d: enable dsi transcoder */
        gen11_dsi_enable_transcoder(encoder);

        /* step7: enable backlight */
        intel_panel_enable_backlight(crtc_state, conn_state);
        intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_BACKLIGHT_ON);

        intel_crtc_vblank_on(crtc_state);
}

static void gen11_dsi_disable_transcoder(struct intel_encoder *encoder)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
        enum port port;
        enum transcoder dsi_trans;
        u32 tmp;

        for_each_dsi_port(port, intel_dsi->ports) {
                dsi_trans = dsi_port_to_transcoder(port);

                /* disable transcoder */
                tmp = intel_de_read(dev_priv, PIPECONF(dsi_trans));
                tmp &= ~PIPECONF_ENABLE;
                intel_de_write(dev_priv, PIPECONF(dsi_trans), tmp);

                /* wait for transcoder to be disabled */
                if (intel_de_wait_for_clear(dev_priv, PIPECONF(dsi_trans),
                                            I965_PIPECONF_ACTIVE, 50))
                        drm_err(&dev_priv->drm,
                                "DSI trancoder not disabled\n");
        }
}

static void gen11_dsi_powerdown_panel(struct intel_encoder *encoder)
{
        struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);

        intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_DISPLAY_OFF);
        intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_ASSERT_RESET);
        intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_POWER_OFF);

        /* ensure cmds dispatched to panel */
        wait_for_cmds_dispatched_to_panel(encoder);
}

static void gen11_dsi_deconfigure_trancoder(struct intel_encoder *encoder)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
        enum port port;
        enum transcoder dsi_trans;
        u32 tmp;

        /* disable periodic update mode */
        if (is_cmd_mode(intel_dsi)) {
                for_each_dsi_port(port, intel_dsi->ports) {
                        tmp = intel_de_read(dev_priv, DSI_CMD_FRMCTL(port));
                        tmp &= ~DSI_PERIODIC_FRAME_UPDATE_ENABLE;
                        intel_de_write(dev_priv, DSI_CMD_FRMCTL(port), tmp);
                }
        }

        /* put dsi link in ULPS */
        for_each_dsi_port(port, intel_dsi->ports) {
                dsi_trans = dsi_port_to_transcoder(port);
                tmp = intel_de_read(dev_priv, DSI_LP_MSG(dsi_trans));
                tmp |= LINK_ENTER_ULPS;
                tmp &= ~LINK_ULPS_TYPE_LP11;
                intel_de_write(dev_priv, DSI_LP_MSG(dsi_trans), tmp);

                if (wait_for_us((intel_de_read(dev_priv, DSI_LP_MSG(dsi_trans)) &
                                 LINK_IN_ULPS),
                                10))
                        drm_err(&dev_priv->drm, "DSI link not in ULPS\n");
        }

        /* disable ddi function */
        for_each_dsi_port(port, intel_dsi->ports) {
                dsi_trans = dsi_port_to_transcoder(port);
                tmp = intel_de_read(dev_priv, TRANS_DDI_FUNC_CTL(dsi_trans));
                tmp &= ~TRANS_DDI_FUNC_ENABLE;
                intel_de_write(dev_priv, TRANS_DDI_FUNC_CTL(dsi_trans), tmp);
        }

        /* disable port sync mode if dual link */
        if (intel_dsi->dual_link) {
                for_each_dsi_port(port, intel_dsi->ports) {
                        dsi_trans = dsi_port_to_transcoder(port);
                        tmp = intel_de_read(dev_priv,
                                            TRANS_DDI_FUNC_CTL2(dsi_trans));
                        tmp &= ~PORT_SYNC_MODE_ENABLE;
                        intel_de_write(dev_priv,
                                       TRANS_DDI_FUNC_CTL2(dsi_trans), tmp);
                }
        }
}

static void gen11_dsi_disable_port(struct intel_encoder *encoder)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
        u32 tmp;
        enum port port;

        gen11_dsi_ungate_clocks(encoder);
        for_each_dsi_port(port, intel_dsi->ports) {
                tmp = intel_de_read(dev_priv, DDI_BUF_CTL(port));
                tmp &= ~DDI_BUF_CTL_ENABLE;
                intel_de_write(dev_priv, DDI_BUF_CTL(port), tmp);

                if (wait_for_us((intel_de_read(dev_priv, DDI_BUF_CTL(port)) &
                                 DDI_BUF_IS_IDLE),
                                 8))
                        drm_err(&dev_priv->drm,
                                "DDI port:%c buffer not idle\n",
                                port_name(port));
        }
        gen11_dsi_gate_clocks(encoder);
}

static void gen11_dsi_disable_io_power(struct intel_encoder *encoder)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
        enum port port;
        u32 tmp;

        for_each_dsi_port(port, intel_dsi->ports) {
                intel_wakeref_t wakeref;

                wakeref = fetch_and_zero(&intel_dsi->io_wakeref[port]);
                intel_display_power_put(dev_priv,
                                        port == PORT_A ?
                                        POWER_DOMAIN_PORT_DDI_A_IO :
                                        POWER_DOMAIN_PORT_DDI_B_IO,
                                        wakeref);
        }

        /* set mode to DDI */
        for_each_dsi_port(port, intel_dsi->ports) {
                tmp = intel_de_read(dev_priv, ICL_DSI_IO_MODECTL(port));
                tmp &= ~COMBO_PHY_MODE_DSI;
                intel_de_write(dev_priv, ICL_DSI_IO_MODECTL(port), tmp);
        }
}

static void gen11_dsi_disable(struct intel_atomic_state *state,
                              struct intel_encoder *encoder,
                              const struct intel_crtc_state *old_crtc_state,
                              const struct drm_connector_state *old_conn_state)
{
        struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);

        /* step1: turn off backlight */
        intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_BACKLIGHT_OFF);
        intel_panel_disable_backlight(old_conn_state);

        /* step2d,e: disable transcoder and wait */
        gen11_dsi_disable_transcoder(encoder);

        /* step2f,g: powerdown panel */
        gen11_dsi_powerdown_panel(encoder);

        /* step2h,i,j: deconfig trancoder */
        gen11_dsi_deconfigure_trancoder(encoder);

        /* step3: disable port */
        gen11_dsi_disable_port(encoder);

        gen11_dsi_config_util_pin(encoder, false);

        /* step4: disable IO power */
        gen11_dsi_disable_io_power(encoder);
}

static void gen11_dsi_post_disable(struct intel_atomic_state *state,
                                   struct intel_encoder *encoder,
                                   const struct intel_crtc_state *old_crtc_state,
                                   const struct drm_connector_state *old_conn_state)
{
        intel_crtc_vblank_off(old_crtc_state);

        intel_dsc_disable(old_crtc_state);

        skl_scaler_disable(old_crtc_state);
}

static enum drm_mode_status gen11_dsi_mode_valid(struct drm_connector *connector,
                                                 struct drm_display_mode *mode)
{
        /* FIXME: DSC? */
        return intel_dsi_mode_valid(connector, mode);
}

static void gen11_dsi_get_timings(struct intel_encoder *encoder,
                                  struct intel_crtc_state *pipe_config)
{
        struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
        struct drm_display_mode *adjusted_mode =
                                        &pipe_config->hw.adjusted_mode;

        if (pipe_config->dsc.compressed_bpp) {
                int div = pipe_config->dsc.compressed_bpp;
                int mul = mipi_dsi_pixel_format_to_bpp(intel_dsi->pixel_format);

                adjusted_mode->crtc_htotal =
                        DIV_ROUND_UP(adjusted_mode->crtc_htotal * mul, div);
                adjusted_mode->crtc_hsync_start =
                        DIV_ROUND_UP(adjusted_mode->crtc_hsync_start * mul, div);
                adjusted_mode->crtc_hsync_end =
                        DIV_ROUND_UP(adjusted_mode->crtc_hsync_end * mul, div);
        }

        if (intel_dsi->dual_link) {
                adjusted_mode->crtc_hdisplay *= 2;
                if (intel_dsi->dual_link == DSI_DUAL_LINK_FRONT_BACK)
                        adjusted_mode->crtc_hdisplay -=
                                                intel_dsi->pixel_overlap;
                adjusted_mode->crtc_htotal *= 2;
        }
        adjusted_mode->crtc_hblank_start = adjusted_mode->crtc_hdisplay;
        adjusted_mode->crtc_hblank_end = adjusted_mode->crtc_htotal;

        if (intel_dsi->operation_mode == INTEL_DSI_VIDEO_MODE) {
                if (intel_dsi->dual_link) {
                        adjusted_mode->crtc_hsync_start *= 2;
                        adjusted_mode->crtc_hsync_end *= 2;
                }
        }
        adjusted_mode->crtc_vblank_start = adjusted_mode->crtc_vdisplay;
        adjusted_mode->crtc_vblank_end = adjusted_mode->crtc_vtotal;
}

static bool gen11_dsi_is_periodic_cmd_mode(struct intel_dsi *intel_dsi)
{
        struct drm_device *dev = intel_dsi->base.base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum transcoder dsi_trans;
        u32 val;

        if (intel_dsi->ports == BIT(PORT_B))
                dsi_trans = TRANSCODER_DSI_1;
        else
                dsi_trans = TRANSCODER_DSI_0;

        val = intel_de_read(dev_priv, DSI_TRANS_FUNC_CONF(dsi_trans));
        return (val & DSI_PERIODIC_FRAME_UPDATE_ENABLE);
}

static void gen11_dsi_get_config(struct intel_encoder *encoder,
                                 struct intel_crtc_state *pipe_config)
{
        struct drm_i915_private *i915 = to_i915(encoder->base.dev);
        struct intel_crtc *crtc = to_intel_crtc(pipe_config->uapi.crtc);
        struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);

        intel_dsc_get_config(encoder, pipe_config);

        /* FIXME: adapt icl_ddi_clock_get() for DSI and use that? */
        pipe_config->port_clock = intel_dpll_get_freq(i915,
                                                      pipe_config->shared_dpll);

        pipe_config->hw.adjusted_mode.crtc_clock = intel_dsi->pclk;
        if (intel_dsi->dual_link)
                pipe_config->hw.adjusted_mode.crtc_clock *= 2;

        gen11_dsi_get_timings(encoder, pipe_config);
        pipe_config->output_types |= BIT(INTEL_OUTPUT_DSI);
        pipe_config->pipe_bpp = bdw_get_pipemisc_bpp(crtc);

        if (gen11_dsi_is_periodic_cmd_mode(intel_dsi))
                pipe_config->mode_flags |= I915_MODE_FLAG_DSI_PERIODIC_CMD_MODE;
}

static int gen11_dsi_dsc_compute_config(struct intel_encoder *encoder,
                                        struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct drm_dsc_config *vdsc_cfg = &crtc_state->dsc.config;
        int dsc_max_bpc = INTEL_GEN(dev_priv) >= 12 ? 12 : 10;
        bool use_dsc;
        int ret;

        use_dsc = intel_bios_get_dsc_params(encoder, crtc_state, dsc_max_bpc);
        if (!use_dsc)
                return 0;

        if (crtc_state->pipe_bpp < 8 * 3)
                return -EINVAL;

        /* FIXME: split only when necessary */
        if (crtc_state->dsc.slice_count > 1)
                crtc_state->dsc.dsc_split = true;

        vdsc_cfg->convert_rgb = true;

        ret = intel_dsc_compute_params(encoder, crtc_state);
        if (ret)
                return ret;

        /* DSI specific sanity checks on the common code */
        drm_WARN_ON(&dev_priv->drm, vdsc_cfg->vbr_enable);
        drm_WARN_ON(&dev_priv->drm, vdsc_cfg->simple_422);
        drm_WARN_ON(&dev_priv->drm,
                    vdsc_cfg->pic_width % vdsc_cfg->slice_width);
        drm_WARN_ON(&dev_priv->drm, vdsc_cfg->slice_height < 8);
        drm_WARN_ON(&dev_priv->drm,
                    vdsc_cfg->pic_height % vdsc_cfg->slice_height);

        ret = drm_dsc_compute_rc_parameters(vdsc_cfg);
        if (ret)
                return ret;

        crtc_state->dsc.compression_enable = true;

        return 0;
}

static int gen11_dsi_compute_config(struct intel_encoder *encoder,
                                    struct intel_crtc_state *pipe_config,
                                    struct drm_connector_state *conn_state)
{
        struct drm_i915_private *i915 = to_i915(encoder->base.dev);
        struct intel_dsi *intel_dsi = container_of(encoder, struct intel_dsi,
                                                   base);
        struct intel_connector *intel_connector = intel_dsi->attached_connector;
        const struct drm_display_mode *fixed_mode =
                intel_connector->panel.fixed_mode;
        struct drm_display_mode *adjusted_mode =
                &pipe_config->hw.adjusted_mode;
        int ret;

        pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
        intel_fixed_panel_mode(fixed_mode, adjusted_mode);

        ret = intel_pch_panel_fitting(pipe_config, conn_state);
        if (ret)
                return ret;

        adjusted_mode->flags = 0;

        /* Dual link goes to trancoder DSI'0' */
        if (intel_dsi->ports == BIT(PORT_B))
                pipe_config->cpu_transcoder = TRANSCODER_DSI_1;
        else
                pipe_config->cpu_transcoder = TRANSCODER_DSI_0;

        if (intel_dsi->pixel_format == MIPI_DSI_FMT_RGB888)
                pipe_config->pipe_bpp = 24;
        else
                pipe_config->pipe_bpp = 18;

        pipe_config->clock_set = true;

        if (gen11_dsi_dsc_compute_config(encoder, pipe_config))
                drm_dbg_kms(&i915->drm, "Attempting to use DSC failed\n");

        pipe_config->port_clock = afe_clk(encoder, pipe_config) / 5;

        /*
         * In case of TE GATE cmd mode, we
         * receive TE from the slave if
         * dual link is enabled
         */
        if (is_cmd_mode(intel_dsi)) {
                if (intel_dsi->ports == (BIT(PORT_B) | BIT(PORT_A)))
                        pipe_config->mode_flags |=
                                                I915_MODE_FLAG_DSI_USE_TE1 |
                                                I915_MODE_FLAG_DSI_USE_TE0;
                else if (intel_dsi->ports == BIT(PORT_B))
                        pipe_config->mode_flags |=
                                                I915_MODE_FLAG_DSI_USE_TE1;
                else
                        pipe_config->mode_flags |=
                                                I915_MODE_FLAG_DSI_USE_TE0;
        }

        return 0;
}

static void gen11_dsi_get_power_domains(struct intel_encoder *encoder,
                                        struct intel_crtc_state *crtc_state)
{
        struct drm_i915_private *i915 = to_i915(encoder->base.dev);

        get_dsi_io_power_domains(i915,
                                 enc_to_intel_dsi(encoder));

        if (crtc_state->dsc.compression_enable)
                intel_display_power_get(i915,
                                        intel_dsc_power_domain(crtc_state));
}

static bool gen11_dsi_get_hw_state(struct intel_encoder *encoder,
                                   enum pipe *pipe)
{
        struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
        struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
        enum transcoder dsi_trans;
        intel_wakeref_t wakeref;
        enum port port;
        bool ret = false;
        u32 tmp;

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

        for_each_dsi_port(port, intel_dsi->ports) {
                dsi_trans = dsi_port_to_transcoder(port);
                tmp = intel_de_read(dev_priv, TRANS_DDI_FUNC_CTL(dsi_trans));
                switch (tmp & TRANS_DDI_EDP_INPUT_MASK) {
                case TRANS_DDI_EDP_INPUT_A_ON:
                        *pipe = PIPE_A;
                        break;
                case TRANS_DDI_EDP_INPUT_B_ONOFF:
                        *pipe = PIPE_B;
                        break;
                case TRANS_DDI_EDP_INPUT_C_ONOFF:
                        *pipe = PIPE_C;
                        break;
                case TRANS_DDI_EDP_INPUT_D_ONOFF:
                        *pipe = PIPE_D;
                        break;
                default:
                        drm_err(&dev_priv->drm, "Invalid PIPE input\n");
                        goto out;
                }

                tmp = intel_de_read(dev_priv, PIPECONF(dsi_trans));
                ret = tmp & PIPECONF_ENABLE;
        }
out:
        intel_display_power_put(dev_priv, encoder->power_domain, wakeref);
        return ret;
}

static void gen11_dsi_encoder_destroy(struct drm_encoder *encoder)
{
        intel_encoder_destroy(encoder);
}

static const struct drm_encoder_funcs gen11_dsi_encoder_funcs = {
        .destroy = gen11_dsi_encoder_destroy,
};

static const struct drm_connector_funcs gen11_dsi_connector_funcs = {
        .late_register = intel_connector_register,
        .early_unregister = intel_connector_unregister,
        .destroy = intel_connector_destroy,
        .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,
        .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
        .atomic_duplicate_state = intel_digital_connector_duplicate_state,
};

static const struct drm_connector_helper_funcs gen11_dsi_connector_helper_funcs = {
        .get_modes = intel_dsi_get_modes,
        .mode_valid = gen11_dsi_mode_valid,
        .atomic_check = intel_digital_connector_atomic_check,
};

static int gen11_dsi_host_attach(struct mipi_dsi_host *host,
                                 struct mipi_dsi_device *dsi)
{
        return 0;
}

static int gen11_dsi_host_detach(struct mipi_dsi_host *host,
                                 struct mipi_dsi_device *dsi)
{
        return 0;
}

static ssize_t gen11_dsi_host_transfer(struct mipi_dsi_host *host,
                                       const struct mipi_dsi_msg *msg)
{
        struct intel_dsi_host *intel_dsi_host = to_intel_dsi_host(host);
        struct mipi_dsi_packet dsi_pkt;
        ssize_t ret;
        bool enable_lpdt = false;

        ret = mipi_dsi_create_packet(&dsi_pkt, msg);
        if (ret < 0)
                return ret;

        if (msg->flags & MIPI_DSI_MSG_USE_LPM)
                enable_lpdt = true;

        /* send packet header */
        ret  = dsi_send_pkt_hdr(intel_dsi_host, dsi_pkt, enable_lpdt);
        if (ret < 0)
                return ret;

        /* only long packet contains payload */
        if (mipi_dsi_packet_format_is_long(msg->type)) {
                ret = dsi_send_pkt_payld(intel_dsi_host, dsi_pkt);
                if (ret < 0)
                        return ret;
        }

        //TODO: add payload receive code if needed

        ret = sizeof(dsi_pkt.header) + dsi_pkt.payload_length;

        return ret;
}

static const struct mipi_dsi_host_ops gen11_dsi_host_ops = {
        .attach = gen11_dsi_host_attach,
        .detach = gen11_dsi_host_detach,
        .transfer = gen11_dsi_host_transfer,
};

#define ICL_PREPARE_CNT_MAX     0x7
#define ICL_CLK_ZERO_CNT_MAX    0xf
#define ICL_TRAIL_CNT_MAX       0x7
#define ICL_TCLK_PRE_CNT_MAX    0x3
#define ICL_TCLK_POST_CNT_MAX   0x7
#define ICL_HS_ZERO_CNT_MAX     0xf
#define ICL_EXIT_ZERO_CNT_MAX   0x7

static void icl_dphy_param_init(struct intel_dsi *intel_dsi)
{
        struct drm_device *dev = intel_dsi->base.base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct mipi_config *mipi_config = dev_priv->vbt.dsi.config;
        u32 tlpx_ns;
        u32 prepare_cnt, exit_zero_cnt, clk_zero_cnt, trail_cnt;
        u32 ths_prepare_ns, tclk_trail_ns;
        u32 hs_zero_cnt;
        u32 tclk_pre_cnt, tclk_post_cnt;

        tlpx_ns = intel_dsi_tlpx_ns(intel_dsi);

        tclk_trail_ns = max(mipi_config->tclk_trail, mipi_config->ths_trail);
        ths_prepare_ns = max(mipi_config->ths_prepare,
                             mipi_config->tclk_prepare);

        /*
         * prepare cnt in escape clocks
         * this field represents a hexadecimal value with a precision
         * of 1.2 – i.e. the most significant bit is the integer
         * and the least significant 2 bits are fraction bits.
         * so, the field can represent a range of 0.25 to 1.75
         */
        prepare_cnt = DIV_ROUND_UP(ths_prepare_ns * 4, tlpx_ns);
        if (prepare_cnt > ICL_PREPARE_CNT_MAX) {
                drm_dbg_kms(&dev_priv->drm, "prepare_cnt out of range (%d)\n",
                            prepare_cnt);
                prepare_cnt = ICL_PREPARE_CNT_MAX;
        }

        /* clk zero count in escape clocks */
        clk_zero_cnt = DIV_ROUND_UP(mipi_config->tclk_prepare_clkzero -
                                    ths_prepare_ns, tlpx_ns);
        if (clk_zero_cnt > ICL_CLK_ZERO_CNT_MAX) {
                drm_dbg_kms(&dev_priv->drm,
                            "clk_zero_cnt out of range (%d)\n", clk_zero_cnt);
                clk_zero_cnt = ICL_CLK_ZERO_CNT_MAX;
        }

        /* trail cnt in escape clocks*/
        trail_cnt = DIV_ROUND_UP(tclk_trail_ns, tlpx_ns);
        if (trail_cnt > ICL_TRAIL_CNT_MAX) {
                drm_dbg_kms(&dev_priv->drm, "trail_cnt out of range (%d)\n",
                            trail_cnt);
                trail_cnt = ICL_TRAIL_CNT_MAX;
        }

        /* tclk pre count in escape clocks */
        tclk_pre_cnt = DIV_ROUND_UP(mipi_config->tclk_pre, tlpx_ns);
        if (tclk_pre_cnt > ICL_TCLK_PRE_CNT_MAX) {
                drm_dbg_kms(&dev_priv->drm,
                            "tclk_pre_cnt out of range (%d)\n", tclk_pre_cnt);
                tclk_pre_cnt = ICL_TCLK_PRE_CNT_MAX;
        }

        /* tclk post count in escape clocks */
        tclk_post_cnt = DIV_ROUND_UP(mipi_config->tclk_post, tlpx_ns);
        if (tclk_post_cnt > ICL_TCLK_POST_CNT_MAX) {
                drm_dbg_kms(&dev_priv->drm,
                            "tclk_post_cnt out of range (%d)\n",
                            tclk_post_cnt);
                tclk_post_cnt = ICL_TCLK_POST_CNT_MAX;
        }

        /* hs zero cnt in escape clocks */
        hs_zero_cnt = DIV_ROUND_UP(mipi_config->ths_prepare_hszero -
                                   ths_prepare_ns, tlpx_ns);
        if (hs_zero_cnt > ICL_HS_ZERO_CNT_MAX) {
                drm_dbg_kms(&dev_priv->drm, "hs_zero_cnt out of range (%d)\n",
                            hs_zero_cnt);
                hs_zero_cnt = ICL_HS_ZERO_CNT_MAX;
        }

        /* hs exit zero cnt in escape clocks */
        exit_zero_cnt = DIV_ROUND_UP(mipi_config->ths_exit, tlpx_ns);
        if (exit_zero_cnt > ICL_EXIT_ZERO_CNT_MAX) {
                drm_dbg_kms(&dev_priv->drm,
                            "exit_zero_cnt out of range (%d)\n",
                            exit_zero_cnt);
                exit_zero_cnt = ICL_EXIT_ZERO_CNT_MAX;
        }

        /* clock lane dphy timings */
        intel_dsi->dphy_reg = (CLK_PREPARE_OVERRIDE |
                               CLK_PREPARE(prepare_cnt) |
                               CLK_ZERO_OVERRIDE |
                               CLK_ZERO(clk_zero_cnt) |
                               CLK_PRE_OVERRIDE |
                               CLK_PRE(tclk_pre_cnt) |
                               CLK_POST_OVERRIDE |
                               CLK_POST(tclk_post_cnt) |
                               CLK_TRAIL_OVERRIDE |
                               CLK_TRAIL(trail_cnt));

        /* data lanes dphy timings */
        intel_dsi->dphy_data_lane_reg = (HS_PREPARE_OVERRIDE |
                                         HS_PREPARE(prepare_cnt) |
                                         HS_ZERO_OVERRIDE |
                                         HS_ZERO(hs_zero_cnt) |
                                         HS_TRAIL_OVERRIDE |
                                         HS_TRAIL(trail_cnt) |
                                         HS_EXIT_OVERRIDE |
                                         HS_EXIT(exit_zero_cnt));

        intel_dsi_log_params(intel_dsi);
}

static void icl_dsi_add_properties(struct intel_connector *connector)
{
        u32 allowed_scalers;

        allowed_scalers = BIT(DRM_MODE_SCALE_ASPECT) |
                           BIT(DRM_MODE_SCALE_FULLSCREEN) |
                           BIT(DRM_MODE_SCALE_CENTER);

        drm_connector_attach_scaling_mode_property(&connector->base,
                                                   allowed_scalers);

        connector->base.state->scaling_mode = DRM_MODE_SCALE_ASPECT;

        drm_connector_set_panel_orientation_with_quirk(&connector->base,
                                intel_dsi_get_panel_orientation(connector),
                                connector->panel.fixed_mode->hdisplay,
                                connector->panel.fixed_mode->vdisplay);
}

void icl_dsi_init(struct drm_i915_private *dev_priv)
{
        struct drm_device *dev = &dev_priv->drm;
        struct intel_dsi *intel_dsi;
        struct intel_encoder *encoder;
        struct intel_connector *intel_connector;
        struct drm_connector *connector;
        struct drm_display_mode *fixed_mode;
        enum port port;

        if (!intel_bios_is_dsi_present(dev_priv, &port))
                return;

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

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

        encoder = &intel_dsi->base;
        intel_dsi->attached_connector = intel_connector;
        connector = &intel_connector->base;

        /* register DSI encoder with DRM subsystem */
        drm_encoder_init(dev, &encoder->base, &gen11_dsi_encoder_funcs,
                         DRM_MODE_ENCODER_DSI, "DSI %c", port_name(port));

        encoder->pre_pll_enable = gen11_dsi_pre_pll_enable;
        encoder->pre_enable = gen11_dsi_pre_enable;
        encoder->enable = gen11_dsi_enable;
        encoder->disable = gen11_dsi_disable;
        encoder->post_disable = gen11_dsi_post_disable;
        encoder->port = port;
        encoder->get_config = gen11_dsi_get_config;
        encoder->update_pipe = intel_panel_update_backlight;
        encoder->compute_config = gen11_dsi_compute_config;
        encoder->get_hw_state = gen11_dsi_get_hw_state;
        encoder->type = INTEL_OUTPUT_DSI;
        encoder->cloneable = 0;
        encoder->pipe_mask = ~0;
        encoder->power_domain = POWER_DOMAIN_PORT_DSI;
        encoder->get_power_domains = gen11_dsi_get_power_domains;

        /* register DSI connector with DRM subsystem */
        drm_connector_init(dev, connector, &gen11_dsi_connector_funcs,
                           DRM_MODE_CONNECTOR_DSI);
        drm_connector_helper_add(connector, &gen11_dsi_connector_helper_funcs);
        connector->display_info.subpixel_order = SubPixelHorizontalRGB;
        connector->interlace_allowed = false;
        connector->doublescan_allowed = false;
        intel_connector->get_hw_state = intel_connector_get_hw_state;

        /* attach connector to encoder */
        intel_connector_attach_encoder(intel_connector, encoder);

        mutex_lock(&dev->mode_config.mutex);
        fixed_mode = intel_panel_vbt_fixed_mode(intel_connector);
        mutex_unlock(&dev->mode_config.mutex);

        if (!fixed_mode) {
                drm_err(&dev_priv->drm, "DSI fixed mode info missing\n");
                goto err;
        }

        intel_panel_init(&intel_connector->panel, fixed_mode, NULL);
        intel_panel_setup_backlight(connector, INVALID_PIPE);

        if (dev_priv->vbt.dsi.config->dual_link)
                intel_dsi->ports = BIT(PORT_A) | BIT(PORT_B);
        else
                intel_dsi->ports = BIT(port);

        intel_dsi->dcs_backlight_ports = dev_priv->vbt.dsi.bl_ports;
        intel_dsi->dcs_cabc_ports = dev_priv->vbt.dsi.cabc_ports;

        for_each_dsi_port(port, intel_dsi->ports) {
                struct intel_dsi_host *host;

                host = intel_dsi_host_init(intel_dsi, &gen11_dsi_host_ops, port);
                if (!host)
                        goto err;

                intel_dsi->dsi_hosts[port] = host;
        }

        if (!intel_dsi_vbt_init(intel_dsi, MIPI_DSI_GENERIC_PANEL_ID)) {
                drm_dbg_kms(&dev_priv->drm, "no device found\n");
                goto err;
        }

        icl_dphy_param_init(intel_dsi);

        icl_dsi_add_properties(intel_connector);
        return;

err:
        drm_connector_cleanup(connector);
        drm_encoder_cleanup(&encoder->base);
        kfree(intel_dsi);
        kfree(intel_connector);
}