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

#include <linux/debugfs.h>
#include <linux/firmware.h>

#include <drm/display/drm_dp_helper.h>
#include <drm/display/drm_dsc_helper.h>
#include <drm/drm_edid.h>
#include <drm/drm_fixed.h>
#include <drm/drm_print.h>

#include "intel_display.h"
#include "intel_display_core.h"
#include "intel_display_rpm.h"
#include "intel_display_types.h"
#include "intel_display_utils.h"
#include "intel_gmbus.h"
#include "intel_rom.h"

#define _INTEL_BIOS_PRIVATE
#include "intel_vbt_defs.h"

/**
 * DOC: Video BIOS Table (VBT)
 *
 * The Video BIOS Table, or VBT, provides platform and board specific
 * configuration information to the driver that is not discoverable or available
 * through other means. The configuration is mostly related to display
 * hardware. The VBT is available via the ACPI OpRegion or, on older systems, in
 * the PCI ROM.
 *
 * The VBT consists of a VBT Header (defined as &struct vbt_header), a BDB
 * Header (&struct bdb_header), and a number of BIOS Data Blocks (BDB) that
 * contain the actual configuration information. The VBT Header, and thus the
 * VBT, begins with "$VBT" signature. The VBT Header contains the offset of the
 * BDB Header. The data blocks are concatenated after the BDB Header. The data
 * blocks have a 1-byte Block ID, 2-byte Block Size, and Block Size bytes of
 * data. (Block 53, the MIPI Sequence Block is an exception.)
 *
 * The driver parses the VBT during load. The relevant information is stored in
 * driver private data for ease of use, and the actual VBT is not read after
 * that.
 */

/* Wrapper for VBT child device config */
struct intel_bios_encoder_data {
        struct intel_display *display;

        struct child_device_config child;
        struct dsc_compression_parameters_entry *dsc;
        struct list_head node;
};

#define TARGET_ADDR1    0x70
#define TARGET_ADDR2    0x72

/* Get BDB block size given a pointer to Block ID. */
static u32 _get_blocksize(const u8 *block_base)
{
        /* The MIPI Sequence Block v3+ has a separate size field. */
        if (*block_base == BDB_MIPI_SEQUENCE && *(block_base + 3) >= 3)
                return *((const u32 *)(block_base + 4));
        else
                return *((const u16 *)(block_base + 1));
}

/* Get BDB block size give a pointer to data after Block ID and Block Size. */
static u32 get_blocksize(const void *block_data)
{
        return _get_blocksize(block_data - 3);
}

static const void *
find_raw_section(const void *_bdb, enum bdb_block_id section_id)
{
        const struct bdb_header *bdb = _bdb;
        const u8 *base = _bdb;
        int index = 0;
        u32 total, current_size;
        enum bdb_block_id current_id;

        /* skip to first section */
        index += bdb->header_size;
        total = bdb->bdb_size;

        /* walk the sections looking for section_id */
        while (index + 3 < total) {
                current_id = *(base + index);
                current_size = _get_blocksize(base + index);
                index += 3;

                if (index + current_size > total)
                        return NULL;

                if (current_id == section_id)
                        return base + index;

                index += current_size;
        }

        return NULL;
}

/*
 * Offset from the start of BDB to the start of the
 * block data (just past the block header).
 */
static u32 raw_block_offset(const void *bdb, enum bdb_block_id section_id)
{
        const void *block;

        block = find_raw_section(bdb, section_id);
        if (!block)
                return 0;

        return block - bdb;
}

struct bdb_block_entry {
        struct list_head node;
        enum bdb_block_id section_id;
        u8 data[];
};

static const void *
bdb_find_section(struct intel_display *display,
                 enum bdb_block_id section_id)
{
        struct bdb_block_entry *entry;

        list_for_each_entry(entry, &display->vbt.bdb_blocks, node) {
                if (entry->section_id == section_id)
                        return entry->data + 3;
        }

        return NULL;
}

static const struct {
        enum bdb_block_id section_id;
        size_t min_size;
} bdb_blocks[] = {
        { .section_id = BDB_GENERAL_FEATURES,
          .min_size = sizeof(struct bdb_general_features), },
        { .section_id = BDB_GENERAL_DEFINITIONS,
          .min_size = sizeof(struct bdb_general_definitions), },
        { .section_id = BDB_PSR,
          .min_size = sizeof(struct bdb_psr), },
        { .section_id = BDB_DRIVER_FEATURES,
          .min_size = sizeof(struct bdb_driver_features), },
        { .section_id = BDB_SDVO_LVDS_OPTIONS,
          .min_size = sizeof(struct bdb_sdvo_lvds_options), },
        { .section_id = BDB_SDVO_LVDS_DTD,
          .min_size = sizeof(struct bdb_sdvo_lvds_dtd), },
        { .section_id = BDB_EDP,
          .min_size = sizeof(struct bdb_edp), },
        { .section_id = BDB_LFP_OPTIONS,
          .min_size = sizeof(struct bdb_lfp_options), },
        /*
         * BDB_LFP_DATA depends on BDB_LFP_DATA_PTRS,
         * so keep the two ordered.
         */
        { .section_id = BDB_LFP_DATA_PTRS,
          .min_size = sizeof(struct bdb_lfp_data_ptrs), },
        { .section_id = BDB_LFP_DATA,
          .min_size = 0, /* special case */ },
        { .section_id = BDB_LFP_BACKLIGHT,
          .min_size = sizeof(struct bdb_lfp_backlight), },
        { .section_id = BDB_LFP_POWER,
          .min_size = sizeof(struct bdb_lfp_power), },
        { .section_id = BDB_MIPI_CONFIG,
          .min_size = sizeof(struct bdb_mipi_config), },
        { .section_id = BDB_MIPI_SEQUENCE,
          .min_size = sizeof(struct bdb_mipi_sequence) },
        { .section_id = BDB_COMPRESSION_PARAMETERS,
          .min_size = sizeof(struct bdb_compression_parameters), },
        { .section_id = BDB_GENERIC_DTD,
          .min_size = sizeof(struct bdb_generic_dtd), },
};

static size_t lfp_data_min_size(struct intel_display *display)
{
        const struct bdb_lfp_data_ptrs *ptrs;
        size_t size;

        ptrs = bdb_find_section(display, BDB_LFP_DATA_PTRS);
        if (!ptrs)
                return 0;

        size = sizeof(struct bdb_lfp_data);
        if (ptrs->panel_name.table_size)
                size = max(size, ptrs->panel_name.offset +
                           sizeof(struct bdb_lfp_data_tail));

        return size;
}

static bool validate_lfp_data_ptrs(const void *bdb,
                                   const struct bdb_lfp_data_ptrs *ptrs)
{
        int fp_timing_size, dvo_timing_size, panel_pnp_id_size, panel_name_size;
        int data_block_size, lfp_data_size;
        const void *data_block;
        int i;

        data_block = find_raw_section(bdb, BDB_LFP_DATA);
        if (!data_block)
                return false;

        data_block_size = get_blocksize(data_block);
        if (data_block_size == 0)
                return false;

        /* always 3 indicating the presence of fp_timing+dvo_timing+panel_pnp_id */
        if (ptrs->num_entries != 3)
                return false;

        fp_timing_size = ptrs->ptr[0].fp_timing.table_size;
        dvo_timing_size = ptrs->ptr[0].dvo_timing.table_size;
        panel_pnp_id_size = ptrs->ptr[0].panel_pnp_id.table_size;
        panel_name_size = ptrs->panel_name.table_size;

        /* fp_timing has variable size */
        if (fp_timing_size < 32 ||
            dvo_timing_size != sizeof(struct bdb_edid_dtd) ||
            panel_pnp_id_size != sizeof(struct bdb_edid_pnp_id))
                return false;

        /* panel_name is not present in old VBTs */
        if (panel_name_size != 0 &&
            panel_name_size != sizeof(struct bdb_edid_product_name))
                return false;

        lfp_data_size = ptrs->ptr[1].fp_timing.offset - ptrs->ptr[0].fp_timing.offset;
        if (16 * lfp_data_size > data_block_size)
                return false;

        /* make sure the table entries have uniform size */
        for (i = 1; i < 16; i++) {
                if (ptrs->ptr[i].fp_timing.table_size != fp_timing_size ||
                    ptrs->ptr[i].dvo_timing.table_size != dvo_timing_size ||
                    ptrs->ptr[i].panel_pnp_id.table_size != panel_pnp_id_size)
                        return false;

                if (ptrs->ptr[i].fp_timing.offset - ptrs->ptr[i-1].fp_timing.offset != lfp_data_size ||
                    ptrs->ptr[i].dvo_timing.offset - ptrs->ptr[i-1].dvo_timing.offset != lfp_data_size ||
                    ptrs->ptr[i].panel_pnp_id.offset - ptrs->ptr[i-1].panel_pnp_id.offset != lfp_data_size)
                        return false;
        }

        /*
         * Except for vlv/chv machines all real VBTs seem to have 6
         * unaccounted bytes in the fp_timing table. And it doesn't
         * appear to be a really intentional hole as the fp_timing
         * 0xffff terminator is always within those 6 missing bytes.
         */
        if (fp_timing_size + 6 + dvo_timing_size + panel_pnp_id_size == lfp_data_size)
                fp_timing_size += 6;

        if (fp_timing_size + dvo_timing_size + panel_pnp_id_size != lfp_data_size)
                return false;

        if (ptrs->ptr[0].fp_timing.offset + fp_timing_size != ptrs->ptr[0].dvo_timing.offset ||
            ptrs->ptr[0].dvo_timing.offset + dvo_timing_size != ptrs->ptr[0].panel_pnp_id.offset ||
            ptrs->ptr[0].panel_pnp_id.offset + panel_pnp_id_size != lfp_data_size)
                return false;

        /* make sure the tables fit inside the data block */
        for (i = 0; i < 16; i++) {
                if (ptrs->ptr[i].fp_timing.offset + fp_timing_size > data_block_size ||
                    ptrs->ptr[i].dvo_timing.offset + dvo_timing_size > data_block_size ||
                    ptrs->ptr[i].panel_pnp_id.offset + panel_pnp_id_size > data_block_size)
                        return false;
        }

        if (ptrs->panel_name.offset + 16 * panel_name_size > data_block_size)
                return false;

        /* make sure fp_timing terminators are present at expected locations */
        for (i = 0; i < 16; i++) {
                const u16 *t = data_block + ptrs->ptr[i].fp_timing.offset +
                        fp_timing_size - 2;

                if (*t != 0xffff)
                        return false;
        }

        return true;
}

/* make the data table offsets relative to the data block */
static bool fixup_lfp_data_ptrs(const void *bdb, void *ptrs_block)
{
        struct bdb_lfp_data_ptrs *ptrs = ptrs_block;
        u32 offset;
        int i;

        offset = raw_block_offset(bdb, BDB_LFP_DATA);

        for (i = 0; i < 16; i++) {
                if (ptrs->ptr[i].fp_timing.offset < offset ||
                    ptrs->ptr[i].dvo_timing.offset < offset ||
                    ptrs->ptr[i].panel_pnp_id.offset < offset)
                        return false;

                ptrs->ptr[i].fp_timing.offset -= offset;
                ptrs->ptr[i].dvo_timing.offset -= offset;
                ptrs->ptr[i].panel_pnp_id.offset -= offset;
        }

        if (ptrs->panel_name.table_size) {
                if (ptrs->panel_name.offset < offset)
                        return false;

                ptrs->panel_name.offset -= offset;
        }

        return validate_lfp_data_ptrs(bdb, ptrs);
}

static int make_lfp_data_ptr(struct lfp_data_ptr_table *table,
                             int table_size, int total_size)
{
        if (total_size < table_size)
                return total_size;

        table->table_size = table_size;
        table->offset = total_size - table_size;

        return total_size - table_size;
}

static void next_lfp_data_ptr(struct lfp_data_ptr_table *next,
                              const struct lfp_data_ptr_table *prev,
                              int size)
{
        next->table_size = prev->table_size;
        next->offset = prev->offset + size;
}

static void *generate_lfp_data_ptrs(struct intel_display *display,
                                    const void *bdb)
{
        int i, size, table_size, block_size, offset, fp_timing_size;
        struct bdb_lfp_data_ptrs *ptrs;
        const void *block;
        void *ptrs_block;

        /*
         * The hardcoded fp_timing_size is only valid for
         * modernish VBTs. All older VBTs definitely should
         * include block 41 and thus we don't need to
         * generate one.
         */
        if (display->vbt.version < 155)
                return NULL;

        fp_timing_size = 38;

        block = find_raw_section(bdb, BDB_LFP_DATA);
        if (!block)
                return NULL;

        drm_dbg_kms(display->drm, "Generating LFP data table pointers\n");

        block_size = get_blocksize(block);

        size = fp_timing_size + sizeof(struct bdb_edid_dtd) +
                sizeof(struct bdb_edid_pnp_id);
        if (size * 16 > block_size)
                return NULL;

        ptrs_block = kzalloc(sizeof(*ptrs) + 3, GFP_KERNEL);
        if (!ptrs_block)
                return NULL;

        *(u8 *)(ptrs_block + 0) = BDB_LFP_DATA_PTRS;
        *(u16 *)(ptrs_block + 1) = sizeof(*ptrs);
        ptrs = ptrs_block + 3;

        table_size = sizeof(struct bdb_edid_pnp_id);
        size = make_lfp_data_ptr(&ptrs->ptr[0].panel_pnp_id, table_size, size);

        table_size = sizeof(struct bdb_edid_dtd);
        size = make_lfp_data_ptr(&ptrs->ptr[0].dvo_timing, table_size, size);

        table_size = fp_timing_size;
        size = make_lfp_data_ptr(&ptrs->ptr[0].fp_timing, table_size, size);

        if (ptrs->ptr[0].fp_timing.table_size)
                ptrs->num_entries++;
        if (ptrs->ptr[0].dvo_timing.table_size)
                ptrs->num_entries++;
        if (ptrs->ptr[0].panel_pnp_id.table_size)
                ptrs->num_entries++;

        if (size != 0 || ptrs->num_entries != 3) {
                kfree(ptrs_block);
                return NULL;
        }

        size = fp_timing_size + sizeof(struct bdb_edid_dtd) +
                sizeof(struct bdb_edid_pnp_id);
        for (i = 1; i < 16; i++) {
                next_lfp_data_ptr(&ptrs->ptr[i].fp_timing, &ptrs->ptr[i-1].fp_timing, size);
                next_lfp_data_ptr(&ptrs->ptr[i].dvo_timing, &ptrs->ptr[i-1].dvo_timing, size);
                next_lfp_data_ptr(&ptrs->ptr[i].panel_pnp_id, &ptrs->ptr[i-1].panel_pnp_id, size);
        }

        table_size = sizeof(struct bdb_edid_product_name);

        if (16 * (size + table_size) <= block_size) {
                ptrs->panel_name.table_size = table_size;
                ptrs->panel_name.offset = size * 16;
        }

        offset = block - bdb;

        for (i = 0; i < 16; i++) {
                ptrs->ptr[i].fp_timing.offset += offset;
                ptrs->ptr[i].dvo_timing.offset += offset;
                ptrs->ptr[i].panel_pnp_id.offset += offset;
        }

        if (ptrs->panel_name.table_size)
                ptrs->panel_name.offset += offset;

        return ptrs_block;
}

static void
init_bdb_block(struct intel_display *display,
               const void *bdb, enum bdb_block_id section_id,
               size_t min_size)
{
        struct bdb_block_entry *entry;
        void *temp_block = NULL;
        const void *block;
        size_t block_size;

        block = find_raw_section(bdb, section_id);

        /* Modern VBTs lack the LFP data table pointers block, make one up */
        if (!block && section_id == BDB_LFP_DATA_PTRS) {
                temp_block = generate_lfp_data_ptrs(display, bdb);
                if (temp_block)
                        block = temp_block + 3;
        }
        if (!block)
                return;

        drm_WARN(display->drm, min_size == 0,
                 "Block %d min_size is zero\n", section_id);

        block_size = get_blocksize(block);

        /*
         * Version number and new block size are considered
         * part of the header for MIPI sequenece block v3+.
         */
        if (section_id == BDB_MIPI_SEQUENCE && *(const u8 *)block >= 3)
                block_size += 5;

        entry = kzalloc_flex(*entry, data, max(min_size, block_size) + 3);
        if (!entry) {
                kfree(temp_block);
                return;
        }

        entry->section_id = section_id;
        memcpy(entry->data, block - 3, block_size + 3);

        kfree(temp_block);

        drm_dbg_kms(display->drm,
                    "Found BDB block %d (size %zu, min size %zu)\n",
                    section_id, block_size, min_size);

        if (section_id == BDB_LFP_DATA_PTRS &&
            !fixup_lfp_data_ptrs(bdb, entry->data + 3)) {
                drm_err(display->drm,
                        "VBT has malformed LFP data table pointers\n");
                kfree(entry);
                return;
        }

        list_add_tail(&entry->node, &display->vbt.bdb_blocks);
}

static void init_bdb_blocks(struct intel_display *display,
                            const void *bdb)
{
        int i;

        for (i = 0; i < ARRAY_SIZE(bdb_blocks); i++) {
                enum bdb_block_id section_id = bdb_blocks[i].section_id;
                size_t min_size = bdb_blocks[i].min_size;

                if (section_id == BDB_LFP_DATA)
                        min_size = lfp_data_min_size(display);

                init_bdb_block(display, bdb, section_id, min_size);
        }
}

static void
fill_detail_timing_data(struct intel_display *display,
                        struct drm_display_mode *panel_fixed_mode,
                        const struct bdb_edid_dtd *dvo_timing)
{
        panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
                dvo_timing->hactive_lo;
        panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
                ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
        panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
                ((dvo_timing->hsync_pulse_width_hi << 8) |
                        dvo_timing->hsync_pulse_width_lo);
        panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
                ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);

        panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
                dvo_timing->vactive_lo;
        panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
                ((dvo_timing->vsync_off_hi << 4) | dvo_timing->vsync_off_lo);
        panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
                ((dvo_timing->vsync_pulse_width_hi << 4) |
                        dvo_timing->vsync_pulse_width_lo);
        panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
                ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
        panel_fixed_mode->clock = dvo_timing->clock * 10;
        panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;

        if (dvo_timing->hsync_positive)
                panel_fixed_mode->flags |= DRM_MODE_FLAG_PHSYNC;
        else
                panel_fixed_mode->flags |= DRM_MODE_FLAG_NHSYNC;

        if (dvo_timing->vsync_positive)
                panel_fixed_mode->flags |= DRM_MODE_FLAG_PVSYNC;
        else
                panel_fixed_mode->flags |= DRM_MODE_FLAG_NVSYNC;

        panel_fixed_mode->width_mm = (dvo_timing->himage_hi << 8) |
                dvo_timing->himage_lo;
        panel_fixed_mode->height_mm = (dvo_timing->vimage_hi << 8) |
                dvo_timing->vimage_lo;

        /* Some VBTs have bogus h/vsync_end values */
        if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal) {
                drm_dbg_kms(display->drm, "reducing hsync_end %d->%d\n",
                            panel_fixed_mode->hsync_end, panel_fixed_mode->htotal);
                panel_fixed_mode->hsync_end = panel_fixed_mode->htotal;
        }
        if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal) {
                drm_dbg_kms(display->drm, "reducing vsync_end %d->%d\n",
                            panel_fixed_mode->vsync_end, panel_fixed_mode->vtotal);
                panel_fixed_mode->vsync_end = panel_fixed_mode->vtotal;
        }

        drm_mode_set_name(panel_fixed_mode);
}

static const struct bdb_edid_dtd *
get_lfp_dvo_timing(const struct bdb_lfp_data *data,
                   const struct bdb_lfp_data_ptrs *ptrs,
                   int index)
{
        return (const void *)data + ptrs->ptr[index].dvo_timing.offset;
}

static const struct fp_timing *
get_lfp_fp_timing(const struct bdb_lfp_data *data,
                  const struct bdb_lfp_data_ptrs *ptrs,
                  int index)
{
        return (const void *)data + ptrs->ptr[index].fp_timing.offset;
}

static const struct drm_edid_product_id *
get_lfp_pnp_id(const struct bdb_lfp_data *data,
               const struct bdb_lfp_data_ptrs *ptrs,
               int index)
{
        /* These two are supposed to have the same layout in memory. */
        BUILD_BUG_ON(sizeof(struct bdb_edid_pnp_id) != sizeof(struct drm_edid_product_id));

        return (const void *)data + ptrs->ptr[index].panel_pnp_id.offset;
}

static const struct bdb_lfp_data_tail *
get_lfp_data_tail(const struct bdb_lfp_data *data,
                  const struct bdb_lfp_data_ptrs *ptrs)
{
        if (ptrs->panel_name.table_size)
                return (const void *)data + ptrs->panel_name.offset;
        else
                return NULL;
}

static int opregion_get_panel_type(struct intel_display *display,
                                   const struct intel_bios_encoder_data *devdata,
                                   const struct drm_edid *drm_edid, bool use_fallback)
{
        return intel_opregion_get_panel_type(display);
}

static int vbt_get_panel_type(struct intel_display *display,
                              const struct intel_bios_encoder_data *devdata,
                              const struct drm_edid *drm_edid, bool use_fallback)
{
        const struct bdb_lfp_options *lfp_options;

        lfp_options = bdb_find_section(display, BDB_LFP_OPTIONS);
        if (!lfp_options)
                return -1;

        if (lfp_options->panel_type > 0xf &&
            lfp_options->panel_type != 0xff) {
                drm_dbg_kms(display->drm, "Invalid VBT panel type 0x%x\n",
                            lfp_options->panel_type);
                return -1;
        }

        if (devdata && devdata->child.handle == DEVICE_HANDLE_LFP2)
                return lfp_options->panel_type2;

        drm_WARN_ON(display->drm,
                    devdata && devdata->child.handle != DEVICE_HANDLE_LFP1);

        return lfp_options->panel_type;
}

static int pnpid_get_panel_type(struct intel_display *display,
                                const struct intel_bios_encoder_data *devdata,
                                const struct drm_edid *drm_edid, bool use_fallback)
{
        const struct bdb_lfp_data *data;
        const struct bdb_lfp_data_ptrs *ptrs;
        struct drm_edid_product_id product_id, product_id_nodate;
        struct drm_printer p;
        int i, best = -1;

        if (!drm_edid)
                return -1;

        drm_edid_get_product_id(drm_edid, &product_id);

        product_id_nodate = product_id;
        product_id_nodate.week_of_manufacture = 0;
        product_id_nodate.year_of_manufacture = 0;

        p = drm_dbg_printer(display->drm, DRM_UT_KMS, "EDID");
        drm_edid_print_product_id(&p, &product_id, true);

        ptrs = bdb_find_section(display, BDB_LFP_DATA_PTRS);
        if (!ptrs)
                return -1;

        data = bdb_find_section(display, BDB_LFP_DATA);
        if (!data)
                return -1;

        for (i = 0; i < 16; i++) {
                const struct drm_edid_product_id *vbt_id =
                        get_lfp_pnp_id(data, ptrs, i);

                /* full match? */
                if (!memcmp(vbt_id, &product_id, sizeof(*vbt_id)))
                        return i;

                /*
                 * Accept a match w/o date if no full match is found,
                 * and the VBT entry does not specify a date.
                 */
                if (best < 0 &&
                    !memcmp(vbt_id, &product_id_nodate, sizeof(*vbt_id)))
                        best = i;
        }

        return best;
}

static int fallback_get_panel_type(struct intel_display *display,
                                   const struct intel_bios_encoder_data *devdata,
                                   const struct drm_edid *drm_edid, bool use_fallback)
{
        return use_fallback ? 0 : -1;
}

enum panel_type {
        PANEL_TYPE_OPREGION,
        PANEL_TYPE_VBT,
        PANEL_TYPE_PNPID,
        PANEL_TYPE_FALLBACK,
};

static int get_panel_type(struct intel_display *display,
                          const struct intel_bios_encoder_data *devdata,
                          const struct drm_edid *drm_edid, bool use_fallback)
{
        struct {
                const char *name;
                int (*get_panel_type)(struct intel_display *display,
                                      const struct intel_bios_encoder_data *devdata,
                                      const struct drm_edid *drm_edid, bool use_fallback);
                int panel_type;
        } panel_types[] = {
                [PANEL_TYPE_OPREGION] = {
                        .name = "OpRegion",
                        .get_panel_type = opregion_get_panel_type,
                },
                [PANEL_TYPE_VBT] = {
                        .name = "VBT",
                        .get_panel_type = vbt_get_panel_type,
                },
                [PANEL_TYPE_PNPID] = {
                        .name = "PNPID",
                        .get_panel_type = pnpid_get_panel_type,
                },
                [PANEL_TYPE_FALLBACK] = {
                        .name = "fallback",
                        .get_panel_type = fallback_get_panel_type,
                },
        };
        int i;

        for (i = 0; i < ARRAY_SIZE(panel_types); i++) {
                panel_types[i].panel_type = panel_types[i].get_panel_type(display, devdata,
                                                                          drm_edid, use_fallback);

                drm_WARN_ON(display->drm, panel_types[i].panel_type > 0xf &&
                            panel_types[i].panel_type != 0xff);

                if (panel_types[i].panel_type >= 0)
                        drm_dbg_kms(display->drm, "Panel type (%s): %d\n",
                                    panel_types[i].name, panel_types[i].panel_type);
        }

        if (panel_types[PANEL_TYPE_OPREGION].panel_type >= 0)
                i = PANEL_TYPE_OPREGION;
        else if (panel_types[PANEL_TYPE_VBT].panel_type == 0xff &&
                 panel_types[PANEL_TYPE_PNPID].panel_type >= 0)
                i = PANEL_TYPE_PNPID;
        else if (panel_types[PANEL_TYPE_VBT].panel_type != 0xff &&
                 panel_types[PANEL_TYPE_VBT].panel_type >= 0)
                i = PANEL_TYPE_VBT;
        else
                i = PANEL_TYPE_FALLBACK;

        drm_dbg_kms(display->drm, "Selected panel type (%s): %d\n",
                    panel_types[i].name, panel_types[i].panel_type);

        return panel_types[i].panel_type;
}

static unsigned int panel_bits(unsigned int value, int panel_type, int num_bits)
{
        return (value >> (panel_type * num_bits)) & (BIT(num_bits) - 1);
}

static bool panel_bool(unsigned int value, int panel_type)
{
        return panel_bits(value, panel_type, 1);
}

/* Parse general panel options */
static void
parse_panel_options(struct intel_display *display,
                    struct intel_panel *panel)
{
        const struct bdb_lfp_options *lfp_options;
        int panel_type = panel->vbt.panel_type;
        int drrs_mode;

        lfp_options = bdb_find_section(display, BDB_LFP_OPTIONS);
        if (!lfp_options)
                return;

        panel->vbt.lvds_dither = lfp_options->pixel_dither;

        /*
         * Empirical evidence indicates the block size can be
         * either 4,14,16,24+ bytes. For older VBTs no clear
         * relationship between the block size vs. BDB version.
         */
        if (get_blocksize(lfp_options) < 16)
                return;

        drrs_mode = panel_bits(lfp_options->dps_panel_type_bits,
                               panel_type, 2);
        /*
         * VBT has static DRRS = 0 and seamless DRRS = 2.
         * The below piece of code is required to adjust vbt.drrs_type
         * to match the enum drrs_support_type.
         */
        switch (drrs_mode) {
        case 0:
                panel->vbt.drrs_type = DRRS_TYPE_STATIC;
                drm_dbg_kms(display->drm, "DRRS supported mode is static\n");
                break;
        case 2:
                panel->vbt.drrs_type = DRRS_TYPE_SEAMLESS;
                drm_dbg_kms(display->drm,
                            "DRRS supported mode is seamless\n");
                break;
        default:
                panel->vbt.drrs_type = DRRS_TYPE_NONE;
                drm_dbg_kms(display->drm,
                            "DRRS not supported (VBT input)\n");
                break;
        }
}

static void
parse_lfp_panel_dtd(struct intel_display *display,
                    struct intel_panel *panel,
                    const struct bdb_lfp_data *lfp_data,
                    const struct bdb_lfp_data_ptrs *lfp_data_ptrs)
{
        const struct bdb_edid_dtd *panel_dvo_timing;
        const struct fp_timing *fp_timing;
        struct drm_display_mode *panel_fixed_mode;
        int panel_type = panel->vbt.panel_type;

        panel_dvo_timing = get_lfp_dvo_timing(lfp_data,
                                              lfp_data_ptrs,
                                              panel_type);

        panel_fixed_mode = kzalloc_obj(*panel_fixed_mode);
        if (!panel_fixed_mode)
                return;

        fill_detail_timing_data(display, panel_fixed_mode, panel_dvo_timing);

        panel->vbt.lfp_vbt_mode = panel_fixed_mode;

        drm_dbg_kms(display->drm,
                    "Found panel mode in BIOS VBT legacy lfp table: " DRM_MODE_FMT "\n",
                    DRM_MODE_ARG(panel_fixed_mode));

        fp_timing = get_lfp_fp_timing(lfp_data,
                                      lfp_data_ptrs,
                                      panel_type);

        /* check the resolution, just to be sure */
        if (fp_timing->x_res == panel_fixed_mode->hdisplay &&
            fp_timing->y_res == panel_fixed_mode->vdisplay) {
                panel->vbt.bios_lvds_val = fp_timing->lvds_reg_val;
                drm_dbg_kms(display->drm,
                            "VBT initial LVDS value %x\n",
                            panel->vbt.bios_lvds_val);
        }
}

static void
parse_lfp_data(struct intel_display *display,
               struct intel_panel *panel)
{
        const struct bdb_lfp_data *data;
        const struct bdb_lfp_data_tail *tail;
        const struct bdb_lfp_data_ptrs *ptrs;
        const struct drm_edid_product_id *pnp_id;
        struct drm_printer p;
        int panel_type = panel->vbt.panel_type;

        ptrs = bdb_find_section(display, BDB_LFP_DATA_PTRS);
        if (!ptrs)
                return;

        data = bdb_find_section(display, BDB_LFP_DATA);
        if (!data)
                return;

        if (!panel->vbt.lfp_vbt_mode)
                parse_lfp_panel_dtd(display, panel, data, ptrs);

        pnp_id = get_lfp_pnp_id(data, ptrs, panel_type);

        p = drm_dbg_printer(display->drm, DRM_UT_KMS, "Panel");
        drm_edid_print_product_id(&p, pnp_id, false);

        tail = get_lfp_data_tail(data, ptrs);
        if (!tail)
                return;

        drm_dbg_kms(display->drm, "Panel name: %.*s\n",
                    (int)sizeof(tail->panel_name[0].name),
                    tail->panel_name[panel_type].name);

        if (display->vbt.version >= 188) {
                panel->vbt.seamless_drrs_min_refresh_rate =
                        tail->seamless_drrs_min_refresh_rate[panel_type];
                drm_dbg_kms(display->drm,
                            "Seamless DRRS min refresh rate: %d Hz\n",
                            panel->vbt.seamless_drrs_min_refresh_rate);
        }
}

static void
parse_generic_dtd(struct intel_display *display,
                  struct intel_panel *panel)
{
        const struct bdb_generic_dtd *generic_dtd;
        const struct generic_dtd_entry *dtd;
        struct drm_display_mode *panel_fixed_mode;
        int num_dtd;

        /*
         * Older VBTs provided DTD information for internal displays through
         * the "LFP panel tables" block (42).  As of VBT revision 229 the
         * DTD information should be provided via a newer "generic DTD"
         * block (58).  Just to be safe, we'll try the new generic DTD block
         * first on VBT >= 229, but still fall back to trying the old LFP
         * block if that fails.
         */
        if (display->vbt.version < 229)
                return;

        generic_dtd = bdb_find_section(display, BDB_GENERIC_DTD);
        if (!generic_dtd)
                return;

        if (generic_dtd->gdtd_size < sizeof(struct generic_dtd_entry)) {
                drm_err(display->drm, "GDTD size %u is too small.\n",
                        generic_dtd->gdtd_size);
                return;
        } else if (generic_dtd->gdtd_size !=
                   sizeof(struct generic_dtd_entry)) {
                drm_err(display->drm, "Unexpected GDTD size %u\n",
                        generic_dtd->gdtd_size);
                /* DTD has unknown fields, but keep going */
        }

        num_dtd = (get_blocksize(generic_dtd) -
                   sizeof(struct bdb_generic_dtd)) / generic_dtd->gdtd_size;
        if (panel->vbt.panel_type >= num_dtd) {
                drm_err(display->drm,
                        "Panel type %d not found in table of %d DTD's\n",
                        panel->vbt.panel_type, num_dtd);
                return;
        }

        dtd = &generic_dtd->dtd[panel->vbt.panel_type];

        panel_fixed_mode = kzalloc_obj(*panel_fixed_mode);
        if (!panel_fixed_mode)
                return;

        panel_fixed_mode->hdisplay = dtd->hactive;
        panel_fixed_mode->hsync_start =
                panel_fixed_mode->hdisplay + dtd->hfront_porch;
        panel_fixed_mode->hsync_end =
                panel_fixed_mode->hsync_start + dtd->hsync;
        panel_fixed_mode->htotal =
                panel_fixed_mode->hdisplay + dtd->hblank;

        panel_fixed_mode->vdisplay = dtd->vactive;
        panel_fixed_mode->vsync_start =
                panel_fixed_mode->vdisplay + dtd->vfront_porch;
        panel_fixed_mode->vsync_end =
                panel_fixed_mode->vsync_start + dtd->vsync;
        panel_fixed_mode->vtotal =
                panel_fixed_mode->vdisplay + dtd->vblank;

        panel_fixed_mode->clock = dtd->pixel_clock;
        panel_fixed_mode->width_mm = dtd->width_mm;
        panel_fixed_mode->height_mm = dtd->height_mm;

        panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
        drm_mode_set_name(panel_fixed_mode);

        if (dtd->hsync_positive_polarity)
                panel_fixed_mode->flags |= DRM_MODE_FLAG_PHSYNC;
        else
                panel_fixed_mode->flags |= DRM_MODE_FLAG_NHSYNC;

        if (dtd->vsync_positive_polarity)
                panel_fixed_mode->flags |= DRM_MODE_FLAG_PVSYNC;
        else
                panel_fixed_mode->flags |= DRM_MODE_FLAG_NVSYNC;

        drm_dbg_kms(display->drm,
                    "Found panel mode in BIOS VBT generic dtd table: " DRM_MODE_FMT "\n",
                    DRM_MODE_ARG(panel_fixed_mode));

        panel->vbt.lfp_vbt_mode = panel_fixed_mode;
}

static void
parse_lfp_backlight(struct intel_display *display,
                    struct intel_panel *panel)
{
        const struct bdb_lfp_backlight *backlight_data;
        const struct lfp_backlight_data_entry *entry;
        int panel_type = panel->vbt.panel_type;
        u16 level;

        backlight_data = bdb_find_section(display, BDB_LFP_BACKLIGHT);
        if (!backlight_data)
                return;

        if (backlight_data->entry_size != sizeof(backlight_data->data[0])) {
                drm_dbg_kms(display->drm,
                            "Unsupported backlight data entry size %u\n",
                            backlight_data->entry_size);
                return;
        }

        entry = &backlight_data->data[panel_type];

        panel->vbt.backlight.present = entry->type == BDB_BACKLIGHT_TYPE_PWM;
        if (!panel->vbt.backlight.present) {
                drm_dbg_kms(display->drm,
                            "PWM backlight not present in VBT (type %u)\n",
                            entry->type);
                return;
        }

        panel->vbt.backlight.type = INTEL_BACKLIGHT_DISPLAY_DDI;
        panel->vbt.backlight.controller = 0;
        if (display->vbt.version >= 191) {
                const struct lfp_backlight_control_method *method;

                method = &backlight_data->backlight_control[panel_type];
                panel->vbt.backlight.type = method->type;
                panel->vbt.backlight.controller = method->controller;
        }

        panel->vbt.backlight.pwm_freq_hz = entry->pwm_freq_hz;
        panel->vbt.backlight.active_low_pwm = entry->active_low_pwm;

        if (display->vbt.version >= 234) {
                u16 min_level;
                bool scale;

                level = backlight_data->brightness_level[panel_type].level;
                min_level = backlight_data->brightness_min_level[panel_type].level;

                if (display->vbt.version >= 236)
                        scale = backlight_data->brightness_precision_bits[panel_type] == 16;
                else
                        scale = level > 255;

                if (scale)
                        min_level = min_level / 255;

                if (min_level > 255) {
                        drm_warn(display->drm, "Brightness min level > 255\n");
                        level = 255;
                }
                panel->vbt.backlight.min_brightness = min_level;

                panel->vbt.backlight.brightness_precision_bits =
                        backlight_data->brightness_precision_bits[panel_type];
        } else {
                level = backlight_data->level[panel_type];
                panel->vbt.backlight.min_brightness = entry->min_brightness;
        }

        if (display->vbt.version >= 239)
                panel->vbt.backlight.hdr_dpcd_refresh_timeout =
                        DIV_ROUND_UP(backlight_data->hdr_dpcd_refresh_timeout[panel_type], 100);
        else
                panel->vbt.backlight.hdr_dpcd_refresh_timeout = 30;

        drm_dbg_kms(display->drm,
                    "VBT backlight PWM modulation frequency %u Hz, "
                    "active %s, min brightness %u, level %u, controller %u\n",
                    panel->vbt.backlight.pwm_freq_hz,
                    panel->vbt.backlight.active_low_pwm ? "low" : "high",
                    panel->vbt.backlight.min_brightness,
                    level,
                    panel->vbt.backlight.controller);
}

static void
parse_sdvo_lvds_data(struct intel_display *display,
                     struct intel_panel *panel)
{
        const struct bdb_sdvo_lvds_dtd *dtd;
        struct drm_display_mode *panel_fixed_mode;
        int index;

        index = display->params.vbt_sdvo_panel_type;
        if (index == -2) {
                drm_dbg_kms(display->drm,
                            "Ignore SDVO LVDS mode from BIOS VBT tables.\n");
                return;
        }

        if (index == -1) {
                const struct bdb_sdvo_lvds_options *sdvo_lvds_options;

                sdvo_lvds_options = bdb_find_section(display, BDB_SDVO_LVDS_OPTIONS);
                if (!sdvo_lvds_options)
                        return;

                index = sdvo_lvds_options->panel_type;
        }

        dtd = bdb_find_section(display, BDB_SDVO_LVDS_DTD);
        if (!dtd)
                return;

        /*
         * This should not happen, as long as the panel_type
         * enumeration doesn't grow over 4 items.  But if it does, it
         * could lead to hard-to-detect bugs, so better double-check
         * it here to be sure.
         */
        if (index >= ARRAY_SIZE(dtd->dtd)) {
                drm_err(display->drm,
                        "index %d is larger than dtd->dtd[4] array\n",
                        index);
                return;
        }

        panel_fixed_mode = kzalloc_obj(*panel_fixed_mode);
        if (!panel_fixed_mode)
                return;

        fill_detail_timing_data(display, panel_fixed_mode, &dtd->dtd[index]);

        panel->vbt.sdvo_lvds_vbt_mode = panel_fixed_mode;

        drm_dbg_kms(display->drm,
                    "Found SDVO LVDS mode in BIOS VBT tables: " DRM_MODE_FMT "\n",
                    DRM_MODE_ARG(panel_fixed_mode));
}

static int intel_bios_ssc_frequency(struct intel_display *display,
                                    bool alternate)
{
        switch (DISPLAY_VER(display)) {
        case 2:
                return alternate ? 66667 : 48000;
        case 3:
        case 4:
                return alternate ? 100000 : 96000;
        default:
                return alternate ? 100000 : 120000;
        }
}

static void
parse_general_features(struct intel_display *display)
{
        const struct bdb_general_features *general;

        general = bdb_find_section(display, BDB_GENERAL_FEATURES);
        if (!general)
                return;

        display->vbt.int_tv_support = general->int_tv_support;
        /* int_crt_support can't be trusted on earlier platforms */
        if (display->vbt.version >= 155 &&
            (HAS_DDI(display) || display->platform.valleyview))
                display->vbt.int_crt_support = general->int_crt_support;
        display->vbt.lvds_use_ssc = general->enable_ssc;
        display->vbt.lvds_ssc_freq =
                intel_bios_ssc_frequency(display, general->ssc_freq);
        display->vbt.display_clock_mode = general->display_clock_mode;
        display->vbt.fdi_rx_polarity_inverted = general->fdi_rx_polarity_inverted;
        if (display->vbt.version >= 181) {
                display->vbt.orientation = general->rotate_180 ?
                        DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP :
                        DRM_MODE_PANEL_ORIENTATION_NORMAL;
        } else {
                display->vbt.orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
        }

        if (display->vbt.version >= 249 && general->afc_startup_config) {
                display->vbt.override_afc_startup = true;
                display->vbt.override_afc_startup_val = general->afc_startup_config == 1 ? 0 : 7;
        }

        drm_dbg_kms(display->drm,
                    "BDB_GENERAL_FEATURES int_tv_support %d int_crt_support %d lvds_use_ssc %d lvds_ssc_freq %d display_clock_mode %d fdi_rx_polarity_inverted %d\n",
                    display->vbt.int_tv_support,
                    display->vbt.int_crt_support,
                    display->vbt.lvds_use_ssc,
                    display->vbt.lvds_ssc_freq,
                    display->vbt.display_clock_mode,
                    display->vbt.fdi_rx_polarity_inverted);
}

static const struct child_device_config *
child_device_ptr(const struct bdb_general_definitions *defs, int i)
{
        return (const void *) &defs->devices[i * defs->child_dev_size];
}

static void
parse_sdvo_device_mapping(struct intel_display *display)
{
        const struct intel_bios_encoder_data *devdata;
        int count = 0;

        /*
         * Only parse SDVO mappings on gens that could have SDVO. This isn't
         * accurate and doesn't have to be, as long as it's not too strict.
         */
        if (!IS_DISPLAY_VER(display, 3, 7)) {
                drm_dbg_kms(display->drm, "Skipping SDVO device mapping\n");
                return;
        }

        list_for_each_entry(devdata, &display->vbt.display_devices, node) {
                const struct child_device_config *child = &devdata->child;
                struct sdvo_device_mapping *mapping;

                if (child->target_addr != TARGET_ADDR1 &&
                    child->target_addr != TARGET_ADDR2) {
                        /*
                         * If the target address is neither 0x70 nor 0x72,
                         * it is not a SDVO device. Skip it.
                         */
                        continue;
                }
                if (child->dvo_port != DEVICE_PORT_DVOB &&
                    child->dvo_port != DEVICE_PORT_DVOC) {
                        /* skip the incorrect SDVO port */
                        drm_dbg_kms(display->drm,
                                    "Incorrect SDVO port. Skip it\n");
                        continue;
                }
                drm_dbg_kms(display->drm,
                            "the SDVO device with target addr %2x is found on"
                            " %s port\n",
                            child->target_addr,
                            (child->dvo_port == DEVICE_PORT_DVOB) ?
                            "SDVOB" : "SDVOC");
                mapping = &display->vbt.sdvo_mappings[child->dvo_port - 1];
                if (!mapping->initialized) {
                        mapping->dvo_port = child->dvo_port;
                        mapping->target_addr = child->target_addr;
                        mapping->dvo_wiring = child->dvo_wiring;
                        mapping->ddc_pin = child->ddc_pin;
                        mapping->i2c_pin = child->i2c_pin;
                        mapping->initialized = 1;
                        drm_dbg_kms(display->drm,
                                    "SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n",
                                    mapping->dvo_port, mapping->target_addr,
                                    mapping->dvo_wiring, mapping->ddc_pin,
                                    mapping->i2c_pin);
                } else {
                        drm_dbg_kms(display->drm,
                                    "Maybe one SDVO port is shared by "
                                    "two SDVO device.\n");
                }
                if (child->target2_addr) {
                        /* Maybe this is a SDVO device with multiple inputs */
                        /* And the mapping info is not added */
                        drm_dbg_kms(display->drm,
                                    "there exists the target2_addr. Maybe this"
                                    " is a SDVO device with multiple inputs.\n");
                }
                count++;
        }

        if (!count) {
                /* No SDVO device info is found */
                drm_dbg_kms(display->drm,
                            "No SDVO device info is found in VBT\n");
        }
}

static void
parse_driver_features(struct intel_display *display)
{
        const struct bdb_driver_features *driver;

        driver = bdb_find_section(display, BDB_DRIVER_FEATURES);
        if (!driver)
                return;

        if (DISPLAY_VER(display) >= 5) {
                /*
                 * Note that we consider BDB_DRIVER_FEATURE_INT_SDVO_LVDS
                 * to mean "eDP". The VBT spec doesn't agree with that
                 * interpretation, but real world VBTs seem to.
                 */
                if (driver->lvds_config != BDB_DRIVER_FEATURE_INT_LVDS)
                        display->vbt.int_lvds_support = 0;
        } else {
                /*
                 * FIXME it's not clear which BDB version has the LVDS config
                 * bits defined. Revision history in the VBT spec says:
                 * "0.92 | Add two definitions for VBT value of LVDS Active
                 *  Config (00b and 11b values defined) | 06/13/2005"
                 * but does not the specify the BDB version.
                 *
                 * So far version 134 (on i945gm) is the oldest VBT observed
                 * in the wild with the bits correctly populated. Version
                 * 108 (on i85x) does not have the bits correctly populated.
                 */
                if (display->vbt.version >= 134 &&
                    driver->lvds_config != BDB_DRIVER_FEATURE_INT_LVDS &&
                    driver->lvds_config != BDB_DRIVER_FEATURE_INT_SDVO_LVDS)
                        display->vbt.int_lvds_support = 0;
        }
}

static void
parse_panel_driver_features(struct intel_display *display,
                            struct intel_panel *panel)
{
        const struct bdb_driver_features *driver;

        driver = bdb_find_section(display, BDB_DRIVER_FEATURES);
        if (!driver)
                return;

        if (display->vbt.version < 228) {
                drm_dbg_kms(display->drm, "DRRS State Enabled:%d\n",
                            driver->drrs_enabled);
                /*
                 * If DRRS is not supported, drrs_type has to be set to 0.
                 * This is because, VBT is configured in such a way that
                 * static DRRS is 0 and DRRS not supported is represented by
                 * driver->drrs_enabled=false
                 */
                if (!driver->drrs_enabled && panel->vbt.drrs_type != DRRS_TYPE_NONE) {
                        /*
                         * FIXME Should DMRRS perhaps be treated as seamless
                         * but without the automatic downclocking?
                         */
                        if (driver->dmrrs_enabled)
                                panel->vbt.drrs_type = DRRS_TYPE_STATIC;
                        else
                                panel->vbt.drrs_type = DRRS_TYPE_NONE;
                }

                panel->vbt.psr.enable = driver->psr_enabled;
        }
}

static void
parse_power_conservation_features(struct intel_display *display,
                                  struct intel_panel *panel)
{
        const struct bdb_lfp_power *power;
        u8 panel_type = panel->vbt.panel_type;

        panel->vbt.vrr = true; /* matches Windows behaviour */

        if (display->vbt.version < 228)
                return;

        power = bdb_find_section(display, BDB_LFP_POWER);
        if (!power)
                return;

        panel->vbt.psr.enable = panel_bool(power->psr, panel_type);

        /*
         * If DRRS is not supported, drrs_type has to be set to 0.
         * This is because, VBT is configured in such a way that
         * static DRRS is 0 and DRRS not supported is represented by
         * power->drrs & BIT(panel_type)=false
         */
        if (!panel_bool(power->drrs, panel_type) && panel->vbt.drrs_type != DRRS_TYPE_NONE) {
                /*
                 * FIXME Should DMRRS perhaps be treated as seamless
                 * but without the automatic downclocking?
                 */
                if (panel_bool(power->dmrrs, panel_type))
                        panel->vbt.drrs_type = DRRS_TYPE_STATIC;
                else
                        panel->vbt.drrs_type = DRRS_TYPE_NONE;
        }

        if (display->vbt.version >= 232)
                panel->vbt.edp.hobl = panel_bool(power->hobl, panel_type);

        if (display->vbt.version >= 233)
                panel->vbt.vrr = panel_bool(power->vrr_feature_enabled,
                                            panel_type);
}

static void vbt_edp_to_pps_delays(struct intel_pps_delays *pps,
                                  const struct edp_power_seq *edp_pps)
{
        pps->power_up = edp_pps->t1_t3;
        pps->backlight_on = edp_pps->t8;
        pps->backlight_off = edp_pps->t9;
        pps->power_down = edp_pps->t10;
        pps->power_cycle = edp_pps->t11_t12;
}

static void
parse_edp(struct intel_display *display,
          struct intel_panel *panel)
{
        const struct bdb_edp *edp;
        const struct edp_fast_link_params *edp_link_params;
        int panel_type = panel->vbt.panel_type;

        edp = bdb_find_section(display, BDB_EDP);
        if (!edp)
                return;

        switch (panel_bits(edp->color_depth, panel_type, 2)) {
        case EDP_18BPP:
                panel->vbt.edp.bpp = 18;
                break;
        case EDP_24BPP:
                panel->vbt.edp.bpp = 24;
                break;
        case EDP_30BPP:
                panel->vbt.edp.bpp = 30;
                break;
        }

        /* Get the eDP sequencing and link info */
        edp_link_params = &edp->fast_link_params[panel_type];

        vbt_edp_to_pps_delays(&panel->vbt.edp.pps,
                              &edp->power_seqs[panel_type]);

        if (display->vbt.version >= 224) {
                panel->vbt.edp.rate =
                        edp->edp_fast_link_training_rate[panel_type] * 20;
        } else {
                switch (edp_link_params->rate) {
                case EDP_RATE_1_62:
                        panel->vbt.edp.rate = 162000;
                        break;
                case EDP_RATE_2_7:
                        panel->vbt.edp.rate = 270000;
                        break;
                case EDP_RATE_5_4:
                        panel->vbt.edp.rate = 540000;
                        break;
                default:
                        drm_dbg_kms(display->drm,
                                    "VBT has unknown eDP link rate value %u\n",
                                    edp_link_params->rate);
                        break;
                }
        }

        switch (edp_link_params->lanes) {
        case EDP_LANE_1:
                panel->vbt.edp.lanes = 1;
                break;
        case EDP_LANE_2:
                panel->vbt.edp.lanes = 2;
                break;
        case EDP_LANE_4:
                panel->vbt.edp.lanes = 4;
                break;
        default:
                drm_dbg_kms(display->drm,
                            "VBT has unknown eDP lane count value %u\n",
                            edp_link_params->lanes);
                break;
        }

        switch (edp_link_params->preemphasis) {
        case EDP_PREEMPHASIS_NONE:
                panel->vbt.edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_0;
                break;
        case EDP_PREEMPHASIS_3_5dB:
                panel->vbt.edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_1;
                break;
        case EDP_PREEMPHASIS_6dB:
                panel->vbt.edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_2;
                break;
        case EDP_PREEMPHASIS_9_5dB:
                panel->vbt.edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_3;
                break;
        default:
                drm_dbg_kms(display->drm,
                            "VBT has unknown eDP pre-emphasis value %u\n",
                            edp_link_params->preemphasis);
                break;
        }

        switch (edp_link_params->vswing) {
        case EDP_VSWING_0_4V:
                panel->vbt.edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_0;
                break;
        case EDP_VSWING_0_6V:
                panel->vbt.edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_1;
                break;
        case EDP_VSWING_0_8V:
                panel->vbt.edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_2;
                break;
        case EDP_VSWING_1_2V:
                panel->vbt.edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_3;
                break;
        default:
                drm_dbg_kms(display->drm,
                            "VBT has unknown eDP voltage swing value %u\n",
                            edp_link_params->vswing);
                break;
        }

        if (display->vbt.version >= 173) {
                u8 vswing;

                /* Don't read from VBT if module parameter has valid value*/
                if (display->params.edp_vswing) {
                        panel->vbt.edp.low_vswing =
                                display->params.edp_vswing == 1;
                } else {
                        vswing = (edp->edp_vswing_preemph >> (panel_type * 4)) & 0xF;
                        panel->vbt.edp.low_vswing = vswing == 0;
                }
        }

        panel->vbt.edp.drrs_msa_timing_delay =
                panel_bits(edp->sdrrs_msa_timing_delay, panel_type, 2);

        if (display->vbt.version >= 244)
                panel->vbt.edp.max_link_rate =
                        edp->edp_max_port_link_rate[panel_type] * 20;

        if (display->vbt.version >= 251)
                panel->vbt.edp.dsc_disable =
                        panel_bool(edp->edp_dsc_disable, panel_type);
}

static void
parse_psr(struct intel_display *display,
          struct intel_panel *panel)
{
        const struct bdb_psr *psr;
        const struct psr_table *psr_table;
        int panel_type = panel->vbt.panel_type;

        psr = bdb_find_section(display, BDB_PSR);
        if (!psr) {
                drm_dbg_kms(display->drm, "No PSR BDB found.\n");
                return;
        }

        psr_table = &psr->psr_table[panel_type];

        panel->vbt.psr.full_link = psr_table->full_link;
        panel->vbt.psr.require_aux_wakeup = psr_table->require_aux_to_wakeup;
        panel->vbt.psr.idle_frames = psr_table->idle_frames;

        /*
         * New psr options 0=500us, 1=100us, 2=2500us, 3=0us
         * Old decimal value is wake up time in multiples of 100 us.
         */
        if (display->vbt.version >= 205 &&
            (DISPLAY_VER(display) >= 9 && !display->platform.broxton)) {
                switch (psr_table->tp1_wakeup_time) {
                case 0:
                        panel->vbt.psr.tp1_wakeup_time_us = 500;
                        break;
                case 1:
                        panel->vbt.psr.tp1_wakeup_time_us = 100;
                        break;
                case 3:
                        panel->vbt.psr.tp1_wakeup_time_us = 0;
                        break;
                default:
                        drm_dbg_kms(display->drm,
                                    "VBT tp1 wakeup time value %d is outside range[0-3], defaulting to max value 2500us\n",
                                    psr_table->tp1_wakeup_time);
                        fallthrough;
                case 2:
                        panel->vbt.psr.tp1_wakeup_time_us = 2500;
                        break;
                }

                switch (psr_table->tp2_tp3_wakeup_time) {
                case 0:
                        panel->vbt.psr.tp2_tp3_wakeup_time_us = 500;
                        break;
                case 1:
                        panel->vbt.psr.tp2_tp3_wakeup_time_us = 100;
                        break;
                case 3:
                        panel->vbt.psr.tp2_tp3_wakeup_time_us = 0;
                        break;
                default:
                        drm_dbg_kms(display->drm,
                                    "VBT tp2_tp3 wakeup time value %d is outside range[0-3], defaulting to max value 2500us\n",
                                    psr_table->tp2_tp3_wakeup_time);
                        fallthrough;
                case 2:
                        panel->vbt.psr.tp2_tp3_wakeup_time_us = 2500;
                break;
                }
        } else {
                panel->vbt.psr.tp1_wakeup_time_us = psr_table->tp1_wakeup_time * 100;
                panel->vbt.psr.tp2_tp3_wakeup_time_us = psr_table->tp2_tp3_wakeup_time * 100;
        }

        if (display->vbt.version >= 226) {
                u32 wakeup_time = psr->psr2_tp2_tp3_wakeup_time;

                wakeup_time = panel_bits(wakeup_time, panel_type, 2);
                switch (wakeup_time) {
                case 0:
                        wakeup_time = 500;
                        break;
                case 1:
                        wakeup_time = 100;
                        break;
                case 3:
                        wakeup_time = 50;
                        break;
                default:
                case 2:
                        wakeup_time = 2500;
                        break;
                }
                panel->vbt.psr.psr2_tp2_tp3_wakeup_time_us = wakeup_time;
        } else {
                /* Reusing PSR1 wakeup time for PSR2 in older VBTs */
                panel->vbt.psr.psr2_tp2_tp3_wakeup_time_us = panel->vbt.psr.tp2_tp3_wakeup_time_us;
        }
}

static void parse_dsi_backlight_ports(struct intel_display *display,
                                      struct intel_panel *panel,
                                      enum port port)
{
        enum port port_bc = DISPLAY_VER(display) >= 11 ? PORT_B : PORT_C;

        if (!panel->vbt.dsi.config->dual_link || display->vbt.version < 197) {
                panel->vbt.dsi.bl_ports = BIT(port);
                if (panel->vbt.dsi.config->cabc_supported)
                        panel->vbt.dsi.cabc_ports = BIT(port);

                return;
        }

        switch (panel->vbt.dsi.config->dl_dcs_backlight_ports) {
        case DL_DCS_PORT_A:
                panel->vbt.dsi.bl_ports = BIT(PORT_A);
                break;
        case DL_DCS_PORT_C:
                panel->vbt.dsi.bl_ports = BIT(port_bc);
                break;
        default:
        case DL_DCS_PORT_A_AND_C:
                panel->vbt.dsi.bl_ports = BIT(PORT_A) | BIT(port_bc);
                break;
        }

        if (!panel->vbt.dsi.config->cabc_supported)
                return;

        switch (panel->vbt.dsi.config->dl_dcs_cabc_ports) {
        case DL_DCS_PORT_A:
                panel->vbt.dsi.cabc_ports = BIT(PORT_A);
                break;
        case DL_DCS_PORT_C:
                panel->vbt.dsi.cabc_ports = BIT(port_bc);
                break;
        default:
        case DL_DCS_PORT_A_AND_C:
                panel->vbt.dsi.cabc_ports =
                                        BIT(PORT_A) | BIT(port_bc);
                break;
        }
}

static void
parse_mipi_config(struct intel_display *display,
                  struct intel_panel *panel)
{
        const struct bdb_mipi_config *start;
        const struct mipi_config *config;
        const struct mipi_pps_data *pps;
        int panel_type = panel->vbt.panel_type;
        enum port port;

        /* parse MIPI blocks only if LFP type is MIPI */
        if (!intel_bios_is_dsi_present(display, &port))
                return;

        /* Initialize this to undefined indicating no generic MIPI support */
        panel->vbt.dsi.panel_id = MIPI_DSI_UNDEFINED_PANEL_ID;

        start = bdb_find_section(display, BDB_MIPI_CONFIG);
        if (!start) {
                drm_dbg_kms(display->drm, "No MIPI config BDB found");
                return;
        }

        drm_dbg_kms(display->drm, "Found MIPI Config block, panel index = %d\n",
                    panel_type);

        /*
         * get hold of the correct configuration block and pps data as per
         * the panel_type as index
         */
        config = &start->config[panel_type];
        pps = &start->pps[panel_type];

        /* store as of now full data. Trim when we realise all is not needed */
        panel->vbt.dsi.config = kmemdup(config, sizeof(struct mipi_config), GFP_KERNEL);
        if (!panel->vbt.dsi.config)
                return;

        panel->vbt.dsi.pps = kmemdup(pps, sizeof(struct mipi_pps_data), GFP_KERNEL);
        if (!panel->vbt.dsi.pps) {
                kfree(panel->vbt.dsi.config);
                return;
        }

        parse_dsi_backlight_ports(display, panel, port);

        /* FIXME is the 90 vs. 270 correct? */
        switch (config->rotation) {
        case ENABLE_ROTATION_0:
                /*
                 * Most (all?) VBTs claim 0 degrees despite having
                 * an upside down panel, thus we do not trust this.
                 */
                panel->vbt.dsi.orientation =
                        DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
                break;
        case ENABLE_ROTATION_90:
                panel->vbt.dsi.orientation =
                        DRM_MODE_PANEL_ORIENTATION_RIGHT_UP;
                break;
        case ENABLE_ROTATION_180:
                panel->vbt.dsi.orientation =
                        DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP;
                break;
        case ENABLE_ROTATION_270:
                panel->vbt.dsi.orientation =
                        DRM_MODE_PANEL_ORIENTATION_LEFT_UP;
                break;
        }

        /* We have mandatory mipi config blocks. Initialize as generic panel */
        panel->vbt.dsi.panel_id = MIPI_DSI_GENERIC_PANEL_ID;
}

/* Find the sequence block and size for the given panel. */
static const u8 *
find_panel_sequence_block(struct intel_display *display,
                          const struct bdb_mipi_sequence *sequence,
                          u16 panel_id, u32 *seq_size)
{
        u32 total = get_blocksize(sequence);
        const u8 *data = &sequence->data[0];
        u8 current_id;
        u32 current_size;
        int header_size = sequence->version >= 3 ? 5 : 3;
        int index = 0;
        int i;

        /* skip new block size */
        if (sequence->version >= 3)
                data += 4;

        for (i = 0; i < MAX_MIPI_CONFIGURATIONS && index < total; i++) {
                if (index + header_size > total) {
                        drm_err(display->drm,
                                "Invalid sequence block (header)\n");
                        return NULL;
                }

                current_id = *(data + index);
                if (sequence->version >= 3)
                        current_size = *((const u32 *)(data + index + 1));
                else
                        current_size = *((const u16 *)(data + index + 1));

                index += header_size;

                if (index + current_size > total) {
                        drm_err(display->drm, "Invalid sequence block\n");
                        return NULL;
                }

                if (current_id == panel_id) {
                        *seq_size = current_size;
                        return data + index;
                }

                index += current_size;
        }

        drm_err(display->drm,
                "Sequence block detected but no valid configuration\n");

        return NULL;
}

static int goto_next_sequence(struct intel_display *display,
                              const u8 *data, int index, int total)
{
        u16 len;

        /* Skip Sequence Byte. */
        for (index = index + 1; index < total; index += len) {
                u8 operation_byte = *(data + index);
                index++;

                switch (operation_byte) {
                case MIPI_SEQ_ELEM_END:
                        return index;
                case MIPI_SEQ_ELEM_SEND_PKT:
                        if (index + 4 > total)
                                return 0;

                        len = *((const u16 *)(data + index + 2)) + 4;
                        break;
                case MIPI_SEQ_ELEM_DELAY:
                        len = 4;
                        break;
                case MIPI_SEQ_ELEM_GPIO:
                        len = 2;
                        break;
                case MIPI_SEQ_ELEM_I2C:
                        if (index + 7 > total)
                                return 0;
                        len = *(data + index + 6) + 7;
                        break;
                default:
                        drm_err(display->drm, "Unknown operation byte\n");
                        return 0;
                }
        }

        return 0;
}

static int goto_next_sequence_v3(struct intel_display *display,
                                 const u8 *data, int index, int total)
{
        int seq_end;
        u16 len;
        u32 size_of_sequence;

        /*
         * Could skip sequence based on Size of Sequence alone, but also do some
         * checking on the structure.
         */
        if (total < 5) {
                drm_err(display->drm, "Too small sequence size\n");
                return 0;
        }

        /* Skip Sequence Byte. */
        index++;

        /*
         * Size of Sequence. Excludes the Sequence Byte and the size itself,
         * includes MIPI_SEQ_ELEM_END byte, excludes the final MIPI_SEQ_END
         * byte.
         */
        size_of_sequence = *((const u32 *)(data + index));
        index += 4;

        seq_end = index + size_of_sequence;
        if (seq_end > total) {
                drm_err(display->drm, "Invalid sequence size\n");
                return 0;
        }

        for (; index < total; index += len) {
                u8 operation_byte = *(data + index);
                index++;

                if (operation_byte == MIPI_SEQ_ELEM_END) {
                        if (index != seq_end) {
                                drm_err(display->drm,
                                        "Invalid element structure\n");
                                return 0;
                        }
                        return index;
                }

                len = *(data + index);
                index++;

                /*
                 * FIXME: Would be nice to check elements like for v1/v2 in
                 * goto_next_sequence() above.
                 */
                switch (operation_byte) {
                case MIPI_SEQ_ELEM_SEND_PKT:
                case MIPI_SEQ_ELEM_DELAY:
                case MIPI_SEQ_ELEM_GPIO:
                case MIPI_SEQ_ELEM_I2C:
                case MIPI_SEQ_ELEM_SPI:
                case MIPI_SEQ_ELEM_PMIC:
                        break;
                default:
                        drm_err(display->drm, "Unknown operation byte %u\n",
                                operation_byte);
                        break;
                }
        }

        return 0;
}

/*
 * Get len of pre-fixed deassert fragment from a v1 init OTP sequence,
 * skip all delay + gpio operands and stop at the first DSI packet op.
 */
static int get_init_otp_deassert_fragment_len(struct intel_display *display,
                                              struct intel_panel *panel)
{
        const u8 *data = panel->vbt.dsi.sequence[MIPI_SEQ_INIT_OTP];
        int index, len;

        if (drm_WARN_ON(display->drm,
                        !data || panel->vbt.dsi.seq_version >= 3))
                return 0;

        /* index = 1 to skip sequence byte */
        for (index = 1; data[index] != MIPI_SEQ_ELEM_END; index += len) {
                switch (data[index]) {
                case MIPI_SEQ_ELEM_SEND_PKT:
                        return index == 1 ? 0 : index;
                case MIPI_SEQ_ELEM_DELAY:
                        len = 5; /* 1 byte for operand + uint32 */
                        break;
                case MIPI_SEQ_ELEM_GPIO:
                        len = 3; /* 1 byte for op, 1 for gpio_nr, 1 for value */
                        break;
                default:
                        return 0;
                }
        }

        return 0;
}

/*
 * Some v1/v2 VBT MIPI sequences do the deassert in the init OTP sequence.
 * The deassert must be done before calling intel_dsi_device_ready, so for
 * these devices we split the init OTP sequence into a deassert sequence and
 * the actual init OTP part.
 */
static void vlv_fixup_mipi_sequences(struct intel_display *display,
                                     struct intel_panel *panel)
{
        u8 *init_otp;
        int len;

        /* Limit this to v1/v2 vid-mode sequences */
        if (panel->vbt.dsi.config->is_cmd_mode ||
            panel->vbt.dsi.seq_version >= 3)
                return;

        /* Only do this if there are otp and assert seqs and no deassert seq */
        if (!panel->vbt.dsi.sequence[MIPI_SEQ_INIT_OTP] ||
            !panel->vbt.dsi.sequence[MIPI_SEQ_ASSERT_RESET] ||
            panel->vbt.dsi.sequence[MIPI_SEQ_DEASSERT_RESET])
                return;

        /* The deassert-sequence ends at the first DSI packet */
        len = get_init_otp_deassert_fragment_len(display, panel);
        if (!len)
                return;

        drm_dbg_kms(display->drm,
                    "Using init OTP fragment to deassert reset\n");

        /* Copy the fragment, update seq byte and terminate it */
        init_otp = (u8 *)panel->vbt.dsi.sequence[MIPI_SEQ_INIT_OTP];
        panel->vbt.dsi.deassert_seq = kmemdup(init_otp, len + 1, GFP_KERNEL);
        if (!panel->vbt.dsi.deassert_seq)
                return;
        panel->vbt.dsi.deassert_seq[0] = MIPI_SEQ_DEASSERT_RESET;
        panel->vbt.dsi.deassert_seq[len] = MIPI_SEQ_ELEM_END;
        /* Use the copy for deassert */
        panel->vbt.dsi.sequence[MIPI_SEQ_DEASSERT_RESET] =
                panel->vbt.dsi.deassert_seq;
        /* Replace the last byte of the fragment with init OTP seq byte */
        init_otp[len - 1] = MIPI_SEQ_INIT_OTP;
        /* And make MIPI_MIPI_SEQ_INIT_OTP point to it */
        panel->vbt.dsi.sequence[MIPI_SEQ_INIT_OTP] = init_otp + len - 1;
}

/*
 * Some machines (eg. Lenovo 82TQ) appear to have broken
 * VBT sequences:
 * - INIT_OTP is not present at all
 * - what should be in INIT_OTP is in DISPLAY_ON
 * - what should be in DISPLAY_ON is in BACKLIGHT_ON
 *   (along with the actual backlight stuff)
 *
 * To make those work we simply swap DISPLAY_ON and INIT_OTP.
 *
 * TODO: Do we need to limit this to specific machines,
 *       or examine the contents of the sequences to
 *       avoid false positives?
 */
static void icl_fixup_mipi_sequences(struct intel_display *display,
                                     struct intel_panel *panel)
{
        if (!panel->vbt.dsi.sequence[MIPI_SEQ_INIT_OTP] &&
            panel->vbt.dsi.sequence[MIPI_SEQ_DISPLAY_ON]) {
                drm_dbg_kms(display->drm,
                            "Broken VBT: Swapping INIT_OTP and DISPLAY_ON sequences\n");

                swap(panel->vbt.dsi.sequence[MIPI_SEQ_INIT_OTP],
                     panel->vbt.dsi.sequence[MIPI_SEQ_DISPLAY_ON]);
        }
}

static void fixup_mipi_sequences(struct intel_display *display,
                                 struct intel_panel *panel)
{
        if (DISPLAY_VER(display) >= 11)
                icl_fixup_mipi_sequences(display, panel);
        else if (display->platform.valleyview)
                vlv_fixup_mipi_sequences(display, panel);
}

static void
parse_mipi_sequence(struct intel_display *display,
                    struct intel_panel *panel)
{
        int panel_type = panel->vbt.panel_type;
        const struct bdb_mipi_sequence *sequence;
        const u8 *seq_data;
        u32 seq_size;
        u8 *data;
        int index = 0;

        /* Only our generic panel driver uses the sequence block. */
        if (panel->vbt.dsi.panel_id != MIPI_DSI_GENERIC_PANEL_ID)
                return;

        sequence = bdb_find_section(display, BDB_MIPI_SEQUENCE);
        if (!sequence) {
                drm_dbg_kms(display->drm,
                            "No MIPI Sequence found, parsing complete\n");
                return;
        }

        /* Fail gracefully for forward incompatible sequence block. */
        if (sequence->version >= 4) {
                drm_err(display->drm,
                        "Unable to parse MIPI Sequence Block v%u\n",
                        sequence->version);
                return;
        }

        drm_dbg_kms(display->drm, "Found MIPI sequence block v%u\n",
                    sequence->version);

        seq_data = find_panel_sequence_block(display, sequence, panel_type, &seq_size);
        if (!seq_data)
                return;

        data = kmemdup(seq_data, seq_size, GFP_KERNEL);
        if (!data)
                return;

        /* Parse the sequences, store pointers to each sequence. */
        for (;;) {
                u8 seq_id = *(data + index);
                if (seq_id == MIPI_SEQ_END)
                        break;

                if (seq_id >= MIPI_SEQ_MAX) {
                        drm_err(display->drm, "Unknown sequence %u\n",
                                seq_id);
                        goto err;
                }

                /* Log about presence of sequences we won't run. */
                if (seq_id == MIPI_SEQ_TEAR_ON || seq_id == MIPI_SEQ_TEAR_OFF)
                        drm_dbg_kms(display->drm,
                                    "Unsupported sequence %u\n", seq_id);

                panel->vbt.dsi.sequence[seq_id] = data + index;

                if (sequence->version >= 3)
                        index = goto_next_sequence_v3(display, data, index, seq_size);
                else
                        index = goto_next_sequence(display, data, index, seq_size);
                if (!index) {
                        drm_err(display->drm, "Invalid sequence %u\n",
                                seq_id);
                        goto err;
                }
        }

        panel->vbt.dsi.data = data;
        panel->vbt.dsi.size = seq_size;
        panel->vbt.dsi.seq_version = sequence->version;

        fixup_mipi_sequences(display, panel);

        drm_dbg_kms(display->drm, "MIPI related VBT parsing complete\n");
        return;

err:
        kfree(data);
        memset(panel->vbt.dsi.sequence, 0, sizeof(panel->vbt.dsi.sequence));
}

static void
parse_compression_parameters(struct intel_display *display)
{
        const struct bdb_compression_parameters *params;
        struct intel_bios_encoder_data *devdata;
        u16 block_size;
        int index;

        if (display->vbt.version < 198)
                return;

        params = bdb_find_section(display, BDB_COMPRESSION_PARAMETERS);
        if (params) {
                /* Sanity checks */
                if (params->entry_size != sizeof(params->data[0])) {
                        drm_dbg_kms(display->drm,
                                    "VBT: unsupported compression param entry size\n");
                        return;
                }

                block_size = get_blocksize(params);
                if (block_size < sizeof(*params)) {
                        drm_dbg_kms(display->drm,
                                    "VBT: expected 16 compression param entries\n");
                        return;
                }
        }

        list_for_each_entry(devdata, &display->vbt.display_devices, node) {
                const struct child_device_config *child = &devdata->child;

                if (!child->compression_enable)
                        continue;

                if (!params) {
                        drm_dbg_kms(display->drm,
                                    "VBT: compression params not available\n");
                        continue;
                }

                if (child->compression_method_cps) {
                        drm_dbg_kms(display->drm,
                                    "VBT: CPS compression not supported\n");
                        continue;
                }

                index = child->compression_structure_index;

                devdata->dsc = kmemdup(&params->data[index],
                                       sizeof(*devdata->dsc), GFP_KERNEL);
        }
}

static u8 translate_iboost(struct intel_display *display, u8 val)
{
        static const u8 mapping[] = { 1, 3, 7 }; /* See VBT spec */

        if (val >= ARRAY_SIZE(mapping)) {
                drm_dbg_kms(display->drm,
                            "Unsupported I_boost value found in VBT (%d), display may not work properly\n", val);
                return 0;
        }
        return mapping[val];
}

static const u8 cnp_ddc_pin_map[] = {
        [0] = 0, /* N/A */
        [GMBUS_PIN_1_BXT] = DDC_BUS_DDI_B,
        [GMBUS_PIN_2_BXT] = DDC_BUS_DDI_C,
        [GMBUS_PIN_4_CNP] = DDC_BUS_DDI_D, /* sic */
        [GMBUS_PIN_3_BXT] = DDC_BUS_DDI_F, /* sic */
};

static const u8 icp_ddc_pin_map[] = {
        [GMBUS_PIN_1_BXT] = ICL_DDC_BUS_DDI_A,
        [GMBUS_PIN_2_BXT] = ICL_DDC_BUS_DDI_B,
        [GMBUS_PIN_3_BXT] = TGL_DDC_BUS_DDI_C,
        [GMBUS_PIN_9_TC1_ICP] = ICL_DDC_BUS_PORT_1,
        [GMBUS_PIN_10_TC2_ICP] = ICL_DDC_BUS_PORT_2,
        [GMBUS_PIN_11_TC3_ICP] = ICL_DDC_BUS_PORT_3,
        [GMBUS_PIN_12_TC4_ICP] = ICL_DDC_BUS_PORT_4,
        [GMBUS_PIN_13_TC5_TGP] = TGL_DDC_BUS_PORT_5,
        [GMBUS_PIN_14_TC6_TGP] = TGL_DDC_BUS_PORT_6,
};

static const u8 rkl_pch_tgp_ddc_pin_map[] = {
        [GMBUS_PIN_1_BXT] = ICL_DDC_BUS_DDI_A,
        [GMBUS_PIN_2_BXT] = ICL_DDC_BUS_DDI_B,
        [GMBUS_PIN_9_TC1_ICP] = RKL_DDC_BUS_DDI_D,
        [GMBUS_PIN_10_TC2_ICP] = RKL_DDC_BUS_DDI_E,
};

static const u8 adls_ddc_pin_map[] = {
        [GMBUS_PIN_1_BXT] = ICL_DDC_BUS_DDI_A,
        [GMBUS_PIN_9_TC1_ICP] = ADLS_DDC_BUS_PORT_TC1,
        [GMBUS_PIN_10_TC2_ICP] = ADLS_DDC_BUS_PORT_TC2,
        [GMBUS_PIN_11_TC3_ICP] = ADLS_DDC_BUS_PORT_TC3,
        [GMBUS_PIN_12_TC4_ICP] = ADLS_DDC_BUS_PORT_TC4,
};

static const u8 gen9bc_tgp_ddc_pin_map[] = {
        [GMBUS_PIN_2_BXT] = DDC_BUS_DDI_B,
        [GMBUS_PIN_9_TC1_ICP] = DDC_BUS_DDI_C,
        [GMBUS_PIN_10_TC2_ICP] = DDC_BUS_DDI_D,
};

static const u8 adlp_ddc_pin_map[] = {
        [GMBUS_PIN_1_BXT] = ICL_DDC_BUS_DDI_A,
        [GMBUS_PIN_2_BXT] = ICL_DDC_BUS_DDI_B,
        [GMBUS_PIN_9_TC1_ICP] = ADLP_DDC_BUS_PORT_TC1,
        [GMBUS_PIN_10_TC2_ICP] = ADLP_DDC_BUS_PORT_TC2,
        [GMBUS_PIN_11_TC3_ICP] = ADLP_DDC_BUS_PORT_TC3,
        [GMBUS_PIN_12_TC4_ICP] = ADLP_DDC_BUS_PORT_TC4,
};

static u8 map_ddc_pin(struct intel_display *display, u8 vbt_pin)
{
        const u8 *ddc_pin_map;
        int i, n_entries;

        if (INTEL_PCH_TYPE(display) >= PCH_MTL || display->platform.alderlake_p) {
                ddc_pin_map = adlp_ddc_pin_map;
                n_entries = ARRAY_SIZE(adlp_ddc_pin_map);
        } else if (display->platform.alderlake_s) {
                ddc_pin_map = adls_ddc_pin_map;
                n_entries = ARRAY_SIZE(adls_ddc_pin_map);
        } else if (INTEL_PCH_TYPE(display) >= PCH_DG1) {
                return vbt_pin;
        } else if (display->platform.rocketlake && INTEL_PCH_TYPE(display) == PCH_TGP) {
                ddc_pin_map = rkl_pch_tgp_ddc_pin_map;
                n_entries = ARRAY_SIZE(rkl_pch_tgp_ddc_pin_map);
        } else if (HAS_PCH_TGP(display) && DISPLAY_VER(display) == 9) {
                ddc_pin_map = gen9bc_tgp_ddc_pin_map;
                n_entries = ARRAY_SIZE(gen9bc_tgp_ddc_pin_map);
        } else if (INTEL_PCH_TYPE(display) >= PCH_ICP) {
                ddc_pin_map = icp_ddc_pin_map;
                n_entries = ARRAY_SIZE(icp_ddc_pin_map);
        } else if (HAS_PCH_CNP(display)) {
                ddc_pin_map = cnp_ddc_pin_map;
                n_entries = ARRAY_SIZE(cnp_ddc_pin_map);
        } else {
                /* Assuming direct map */
                return vbt_pin;
        }

        for (i = 0; i < n_entries; i++) {
                if (ddc_pin_map[i] == vbt_pin)
                        return i;
        }

        drm_dbg_kms(display->drm,
                    "Ignoring alternate pin: VBT claims DDC pin %d, which is not valid for this platform\n",
                    vbt_pin);
        return 0;
}

static u8 dvo_port_type(u8 dvo_port)
{
        switch (dvo_port) {
        case DVO_PORT_HDMIA:
        case DVO_PORT_HDMIB:
        case DVO_PORT_HDMIC:
        case DVO_PORT_HDMID:
        case DVO_PORT_HDMIE:
        case DVO_PORT_HDMIF:
        case DVO_PORT_HDMIG:
        case DVO_PORT_HDMIH:
        case DVO_PORT_HDMII:
                return DVO_PORT_HDMIA;
        case DVO_PORT_DPA:
        case DVO_PORT_DPB:
        case DVO_PORT_DPC:
        case DVO_PORT_DPD:
        case DVO_PORT_DPE:
        case DVO_PORT_DPF:
        case DVO_PORT_DPG:
        case DVO_PORT_DPH:
        case DVO_PORT_DPI:
                return DVO_PORT_DPA;
        case DVO_PORT_MIPIA:
        case DVO_PORT_MIPIB:
        case DVO_PORT_MIPIC:
        case DVO_PORT_MIPID:
                return DVO_PORT_MIPIA;
        default:
                return dvo_port;
        }
}

static enum port __dvo_port_to_port(int n_ports, int n_dvo,
                                    const int port_mapping[][3], u8 dvo_port)
{
        enum port port;
        int i;

        for (port = PORT_A; port < n_ports; port++) {
                for (i = 0; i < n_dvo; i++) {
                        if (port_mapping[port][i] == -1)
                                break;

                        if (dvo_port == port_mapping[port][i])
                                return port;
                }
        }

        return PORT_NONE;
}

static enum port dvo_port_to_port(struct intel_display *display,
                                  u8 dvo_port)
{
        /*
         * Each DDI port can have more than one value on the "DVO Port" field,
         * so look for all the possible values for each port.
         */
        static const int port_mapping[][3] = {
                [PORT_A] = { DVO_PORT_HDMIA, DVO_PORT_DPA, -1 },
                [PORT_B] = { DVO_PORT_HDMIB, DVO_PORT_DPB, -1 },
                [PORT_C] = { DVO_PORT_HDMIC, DVO_PORT_DPC, -1 },
                [PORT_D] = { DVO_PORT_HDMID, DVO_PORT_DPD, -1 },
                [PORT_E] = { DVO_PORT_HDMIE, DVO_PORT_DPE, DVO_PORT_CRT },
                [PORT_F] = { DVO_PORT_HDMIF, DVO_PORT_DPF, -1 },
                [PORT_G] = { DVO_PORT_HDMIG, DVO_PORT_DPG, -1 },
                [PORT_H] = { DVO_PORT_HDMIH, DVO_PORT_DPH, -1 },
                [PORT_I] = { DVO_PORT_HDMII, DVO_PORT_DPI, -1 },
        };
        /*
         * RKL VBT uses PHY based mapping. Combo PHYs A,B,C,D
         * map to DDI A,B,TC1,TC2 respectively.
         */
        static const int rkl_port_mapping[][3] = {
                [PORT_A] = { DVO_PORT_HDMIA, DVO_PORT_DPA, -1 },
                [PORT_B] = { DVO_PORT_HDMIB, DVO_PORT_DPB, -1 },
                [PORT_C] = { -1 },
                [PORT_TC1] = { DVO_PORT_HDMIC, DVO_PORT_DPC, -1 },
                [PORT_TC2] = { DVO_PORT_HDMID, DVO_PORT_DPD, -1 },
        };
        /*
         * Alderlake S ports used in the driver are PORT_A, PORT_D, PORT_E,
         * PORT_F and PORT_G, we need to map that to correct VBT sections.
         */
        static const int adls_port_mapping[][3] = {
                [PORT_A] = { DVO_PORT_HDMIA, DVO_PORT_DPA, -1 },
                [PORT_B] = { -1 },
                [PORT_C] = { -1 },
                [PORT_TC1] = { DVO_PORT_HDMIB, DVO_PORT_DPB, -1 },
                [PORT_TC2] = { DVO_PORT_HDMIC, DVO_PORT_DPC, -1 },
                [PORT_TC3] = { DVO_PORT_HDMID, DVO_PORT_DPD, -1 },
                [PORT_TC4] = { DVO_PORT_HDMIE, DVO_PORT_DPE, -1 },
        };
        static const int xelpd_port_mapping[][3] = {
                [PORT_A] = { DVO_PORT_HDMIA, DVO_PORT_DPA, -1 },
                [PORT_B] = { DVO_PORT_HDMIB, DVO_PORT_DPB, -1 },
                [PORT_C] = { DVO_PORT_HDMIC, DVO_PORT_DPC, -1 },
                [PORT_D_XELPD] = { DVO_PORT_HDMID, DVO_PORT_DPD, -1 },
                [PORT_E_XELPD] = { DVO_PORT_HDMIE, DVO_PORT_DPE, -1 },
                [PORT_TC1] = { DVO_PORT_HDMIF, DVO_PORT_DPF, -1 },
                [PORT_TC2] = { DVO_PORT_HDMIG, DVO_PORT_DPG, -1 },
                [PORT_TC3] = { DVO_PORT_HDMIH, DVO_PORT_DPH, -1 },
                [PORT_TC4] = { DVO_PORT_HDMII, DVO_PORT_DPI, -1 },
        };

        if (DISPLAY_VER(display) >= 13)
                return __dvo_port_to_port(ARRAY_SIZE(xelpd_port_mapping),
                                          ARRAY_SIZE(xelpd_port_mapping[0]),
                                          xelpd_port_mapping,
                                          dvo_port);
        else if (display->platform.alderlake_s)
                return __dvo_port_to_port(ARRAY_SIZE(adls_port_mapping),
                                          ARRAY_SIZE(adls_port_mapping[0]),
                                          adls_port_mapping,
                                          dvo_port);
        else if (display->platform.dg1 || display->platform.rocketlake)
                return __dvo_port_to_port(ARRAY_SIZE(rkl_port_mapping),
                                          ARRAY_SIZE(rkl_port_mapping[0]),
                                          rkl_port_mapping,
                                          dvo_port);
        else
                return __dvo_port_to_port(ARRAY_SIZE(port_mapping),
                                          ARRAY_SIZE(port_mapping[0]),
                                          port_mapping,
                                          dvo_port);
}

static enum port
dsi_dvo_port_to_port(struct intel_display *display, u8 dvo_port)
{
        switch (dvo_port) {
        case DVO_PORT_MIPIA:
                return PORT_A;
        case DVO_PORT_MIPIC:
                if (DISPLAY_VER(display) >= 11)
                        return PORT_B;
                else
                        return PORT_C;
        default:
                return PORT_NONE;
        }
}

enum port intel_bios_encoder_port(const struct intel_bios_encoder_data *devdata)
{
        struct intel_display *display = devdata->display;
        const struct child_device_config *child = &devdata->child;
        enum port port;

        port = dvo_port_to_port(display, child->dvo_port);
        if (port == PORT_NONE && DISPLAY_VER(display) >= 11)
                port = dsi_dvo_port_to_port(display, child->dvo_port);

        return port;
}

static int parse_bdb_230_dp_max_link_rate(const int vbt_max_link_rate)
{
        switch (vbt_max_link_rate) {
        default:
        case BDB_230_VBT_DP_MAX_LINK_RATE_DEF:
                return 0;
        case BDB_230_VBT_DP_MAX_LINK_RATE_UHBR20:
                return 2000000;
        case BDB_230_VBT_DP_MAX_LINK_RATE_UHBR13P5:
                return 1350000;
        case BDB_230_VBT_DP_MAX_LINK_RATE_UHBR10:
                return 1000000;
        case BDB_230_VBT_DP_MAX_LINK_RATE_HBR3:
                return 810000;
        case BDB_230_VBT_DP_MAX_LINK_RATE_HBR2:
                return 540000;
        case BDB_230_VBT_DP_MAX_LINK_RATE_HBR:
                return 270000;
        case BDB_230_VBT_DP_MAX_LINK_RATE_LBR:
                return 162000;
        }
}

static int parse_bdb_216_dp_max_link_rate(const int vbt_max_link_rate)
{
        switch (vbt_max_link_rate) {
        default:
        case BDB_216_VBT_DP_MAX_LINK_RATE_HBR3:
                return 810000;
        case BDB_216_VBT_DP_MAX_LINK_RATE_HBR2:
                return 540000;
        case BDB_216_VBT_DP_MAX_LINK_RATE_HBR:
                return 270000;
        case BDB_216_VBT_DP_MAX_LINK_RATE_LBR:
                return 162000;
        }
}

static u32 edp_rate_override_mask(int rate)
{
        switch (rate) {
        case 2000000: return BDB_263_VBT_EDP_LINK_RATE_20;
        case 1350000: return BDB_263_VBT_EDP_LINK_RATE_13_5;
        case 1000000: return BDB_263_VBT_EDP_LINK_RATE_10;
        case 810000: return BDB_263_VBT_EDP_LINK_RATE_8_1;
        case 675000: return BDB_263_VBT_EDP_LINK_RATE_6_75;
        case 540000: return BDB_263_VBT_EDP_LINK_RATE_5_4;
        case 432000: return BDB_263_VBT_EDP_LINK_RATE_4_32;
        case 324000: return BDB_263_VBT_EDP_LINK_RATE_3_24;
        case 270000: return BDB_263_VBT_EDP_LINK_RATE_2_7;
        case 243000: return BDB_263_VBT_EDP_LINK_RATE_2_43;
        case 216000: return BDB_263_VBT_EDP_LINK_RATE_2_16;
        case 162000: return BDB_263_VBT_EDP_LINK_RATE_1_62;
        default: return 0;
        }
}

int intel_bios_dp_max_link_rate(const struct intel_bios_encoder_data *devdata)
{
        if (!devdata || devdata->display->vbt.version < 216)
                return 0;

        if (devdata->display->vbt.version >= 230)
                return parse_bdb_230_dp_max_link_rate(devdata->child.dp_max_link_rate);
        else
                return parse_bdb_216_dp_max_link_rate(devdata->child.dp_max_link_rate);
}

int intel_bios_dp_max_lane_count(const struct intel_bios_encoder_data *devdata)
{
        if (!devdata || devdata->display->vbt.version < 244)
                return 0;

        return devdata->child.dp_max_lane_count + 1;
}

bool
intel_bios_encoder_reject_edp_rate(const struct intel_bios_encoder_data *devdata,
                                   int rate)
{
        if (!devdata || devdata->display->vbt.version < 263)
                return false;

        if (devdata->child.edp_data_rate_override == BDB_263_VBT_EDP_RATES_MASK)
                return false;

        return devdata->child.edp_data_rate_override & edp_rate_override_mask(rate);
}

static void sanitize_dedicated_external(struct intel_bios_encoder_data *devdata,
                                        enum port port)
{
        struct intel_display *display = devdata->display;

        if (!intel_bios_encoder_is_dedicated_external(devdata))
                return;

        /*
         * Since dedicated_external is for ports connected to PHYs outside of
         * the Type-C subsystem, clear bits that would only make sense for ports
         * with PHYs in the Type-C subsystem.
         */

        /*
         * Bit dp_usb_type_c is marked as "don't care" in Bspec when
         * dedicated_external is set.
         */
        if (devdata->child.dp_usb_type_c) {
                drm_dbg_kms(display->drm,
                            "VBT claims Port %c supports USB Type-C, but the port is dedicated external, ignoring\n",
                            port_name(port));
                devdata->child.dp_usb_type_c = 0;
        }

        /*
         * Bit tbt is marked as "don't care" in Bspec when dedicated_external is
         * set.
         */
        if (devdata->child.tbt) {
                drm_dbg_kms(display->drm,
                            "VBT claims Port %c supports TBT, but the port is dedicated external, ignoring\n",
                            port_name(port));
                devdata->child.tbt = 0;
        }

        /*
         * DDI allocation for TC capable ports only make sense for PHYs in the
         * Type-C subsystem.
         */
        if (devdata->child.dyn_port_over_tc) {
                drm_dbg_kms(display->drm,
                            "VBT claims Port %c supports dynamic DDI allocation in TCSS, but the port is dedicated external, ignoring\n",
                            port_name(port));
                devdata->child.dyn_port_over_tc = 0;
        }
}

static void sanitize_device_type(struct intel_bios_encoder_data *devdata,
                                 enum port port)
{
        struct intel_display *display = devdata->display;
        bool is_hdmi;

        if (port != PORT_A || DISPLAY_VER(display) >= 12)
                return;

        if (!intel_bios_encoder_supports_dvi(devdata))
                return;

        is_hdmi = intel_bios_encoder_supports_hdmi(devdata);

        drm_dbg_kms(display->drm, "VBT claims port A supports DVI%s, ignoring\n",
                    is_hdmi ? "/HDMI" : "");

        devdata->child.device_type &= ~DEVICE_TYPE_TMDS_DVI_SIGNALING;
        devdata->child.device_type |= DEVICE_TYPE_NOT_HDMI_OUTPUT;
}

static void sanitize_hdmi_level_shift(struct intel_bios_encoder_data *devdata,
                                      enum port port)
{
        struct intel_display *display = devdata->display;

        if (!intel_bios_encoder_supports_dvi(devdata))
                return;

        /*
         * Some BDW machines (eg. HP Pavilion 15-ab) shipped
         * with a HSW VBT where the level shifter value goes
         * up to 11, whereas the BDW max is 9.
         */
        if (display->platform.broadwell && devdata->child.hdmi_level_shifter_value > 9) {
                drm_dbg_kms(display->drm,
                            "Bogus port %c VBT HDMI level shift %d, adjusting to %d\n",
                            port_name(port), devdata->child.hdmi_level_shifter_value, 9);

                devdata->child.hdmi_level_shifter_value = 9;
        }
}

static bool
intel_bios_encoder_supports_crt(const struct intel_bios_encoder_data *devdata)
{
        return devdata->child.device_type & DEVICE_TYPE_ANALOG_OUTPUT;
}

bool
intel_bios_encoder_supports_dvi(const struct intel_bios_encoder_data *devdata)
{
        return devdata->child.device_type & DEVICE_TYPE_TMDS_DVI_SIGNALING;
}

bool
intel_bios_encoder_supports_hdmi(const struct intel_bios_encoder_data *devdata)
{
        return intel_bios_encoder_supports_dvi(devdata) &&
                (devdata->child.device_type & DEVICE_TYPE_NOT_HDMI_OUTPUT) == 0;
}

bool
intel_bios_encoder_supports_dp(const struct intel_bios_encoder_data *devdata)
{
        return devdata->child.device_type & DEVICE_TYPE_DISPLAYPORT_OUTPUT;
}

bool
intel_bios_encoder_supports_edp(const struct intel_bios_encoder_data *devdata)
{
        return intel_bios_encoder_supports_dp(devdata) &&
                devdata->child.device_type & DEVICE_TYPE_INTERNAL_CONNECTOR;
}

bool
intel_bios_encoder_supports_dsi(const struct intel_bios_encoder_data *devdata)
{
        return devdata->child.device_type & DEVICE_TYPE_MIPI_OUTPUT;
}

bool
intel_bios_encoder_is_lspcon(const struct intel_bios_encoder_data *devdata)
{
        return devdata && HAS_LSPCON(devdata->display) && devdata->child.lspcon;
}

/* This is an index in the HDMI/DVI DDI buffer translation table, or -1 */
int intel_bios_hdmi_level_shift(const struct intel_bios_encoder_data *devdata)
{
        if (!devdata || devdata->display->vbt.version < 158 ||
            DISPLAY_VER(devdata->display) >= 14)
                return -1;

        return devdata->child.hdmi_level_shifter_value;
}

int intel_bios_hdmi_max_tmds_clock(const struct intel_bios_encoder_data *devdata)
{
        if (!devdata || devdata->display->vbt.version < 204)
                return 0;

        switch (devdata->child.hdmi_max_data_rate) {
        default:
                MISSING_CASE(devdata->child.hdmi_max_data_rate);
                fallthrough;
        case HDMI_MAX_DATA_RATE_PLATFORM:
                return 0;
        case HDMI_MAX_DATA_RATE_594:
                return 594000;
        case HDMI_MAX_DATA_RATE_340:
                return 340000;
        case HDMI_MAX_DATA_RATE_300:
                return 300000;
        case HDMI_MAX_DATA_RATE_297:
                return 297000;
        case HDMI_MAX_DATA_RATE_165:
                return 165000;
        }
}

static bool is_port_valid(struct intel_display *display, enum port port)
{
        /*
         * On some ICL SKUs port F is not present, but broken VBTs mark
         * the port as present. Only try to initialize port F for the
         * SKUs that may actually have it.
         */
        if (port == PORT_F && display->platform.icelake)
                return display->platform.icelake_port_f;

        return true;
}

static void print_ddi_port(const struct intel_bios_encoder_data *devdata)
{
        struct intel_display *display = devdata->display;
        const struct child_device_config *child = &devdata->child;
        bool is_dvi, is_hdmi, is_dp, is_edp, is_dsi, is_crt, supports_typec_usb, supports_tbt;
        int dp_boost_level, dp_max_link_rate, hdmi_boost_level, hdmi_level_shift, max_tmds_clock;
        enum port port;

        port = intel_bios_encoder_port(devdata);
        if (port == PORT_NONE)
                return;

        is_dvi = intel_bios_encoder_supports_dvi(devdata);
        is_dp = intel_bios_encoder_supports_dp(devdata);
        is_crt = intel_bios_encoder_supports_crt(devdata);
        is_hdmi = intel_bios_encoder_supports_hdmi(devdata);
        is_edp = intel_bios_encoder_supports_edp(devdata);
        is_dsi = intel_bios_encoder_supports_dsi(devdata);

        supports_typec_usb = intel_bios_encoder_supports_typec_usb(devdata);
        supports_tbt = intel_bios_encoder_supports_tbt(devdata);

        drm_dbg_kms(display->drm,
                    "Port %c VBT info: CRT:%d DVI:%d HDMI:%d DP:%d eDP:%d DSI:%d DP++:%d LSPCON:%d USB-Type-C:%d TBT:%d DSC:%d\n",
                    port_name(port), is_crt, is_dvi, is_hdmi, is_dp, is_edp, is_dsi,
                    intel_bios_encoder_supports_dp_dual_mode(devdata),
                    intel_bios_encoder_is_lspcon(devdata),
                    supports_typec_usb, supports_tbt,
                    devdata->dsc != NULL);

        if (intel_bios_encoder_is_dedicated_external(devdata))
                drm_dbg_kms(display->drm,
                            "Port %c is dedicated external\n",
                            port_name(port));

        if (intel_bios_encoder_supports_dyn_port_over_tc(devdata))
                drm_dbg_kms(display->drm,
                            "Port %c supports dynamic DDI allocation in TCSS\n",
                            port_name(port));

        hdmi_level_shift = intel_bios_hdmi_level_shift(devdata);
        if (hdmi_level_shift >= 0) {
                drm_dbg_kms(display->drm,
                            "Port %c VBT HDMI level shift: %d\n",
                            port_name(port), hdmi_level_shift);
        }

        max_tmds_clock = intel_bios_hdmi_max_tmds_clock(devdata);
        if (max_tmds_clock)
                drm_dbg_kms(display->drm,
                            "Port %c VBT HDMI max TMDS clock: %d kHz\n",
                            port_name(port), max_tmds_clock);

        /* I_boost config for SKL and above */
        dp_boost_level = intel_bios_dp_boost_level(devdata);
        if (dp_boost_level)
                drm_dbg_kms(display->drm,
                            "Port %c VBT (e)DP boost level: %d\n",
                            port_name(port), dp_boost_level);

        hdmi_boost_level = intel_bios_hdmi_boost_level(devdata);
        if (hdmi_boost_level)
                drm_dbg_kms(display->drm,
                            "Port %c VBT HDMI boost level: %d\n",
                            port_name(port), hdmi_boost_level);

        dp_max_link_rate = intel_bios_dp_max_link_rate(devdata);
        if (dp_max_link_rate)
                drm_dbg_kms(display->drm,
                            "Port %c VBT DP max link rate: %d\n",
                            port_name(port), dp_max_link_rate);

        /*
         * FIXME need to implement support for VBT
         * vswing/preemph tables should this ever trigger.
         */
        drm_WARN(display->drm, child->use_vbt_vswing,
                 "Port %c asks to use VBT vswing/preemph tables\n",
                 port_name(port));
}

static void parse_ddi_port(struct intel_bios_encoder_data *devdata)
{
        struct intel_display *display = devdata->display;
        enum port port;

        port = intel_bios_encoder_port(devdata);
        if (port == PORT_NONE)
                return;

        if (!is_port_valid(display, port)) {
                drm_dbg_kms(display->drm,
                            "VBT reports port %c as supported, but that can't be true: skipping\n",
                            port_name(port));
                return;
        }

        sanitize_dedicated_external(devdata, port);
        sanitize_device_type(devdata, port);
        sanitize_hdmi_level_shift(devdata, port);
}

static bool has_ddi_port_info(struct intel_display *display)
{
        return DISPLAY_VER(display) >= 5 || display->platform.g4x;
}

static void parse_ddi_ports(struct intel_display *display)
{
        struct intel_bios_encoder_data *devdata;

        if (!has_ddi_port_info(display))
                return;

        list_for_each_entry(devdata, &display->vbt.display_devices, node)
                parse_ddi_port(devdata);

        list_for_each_entry(devdata, &display->vbt.display_devices, node)
                print_ddi_port(devdata);
}

static int child_device_expected_size(u16 version)
{
        BUILD_BUG_ON(sizeof(struct child_device_config) < 40);

        if (version > 264)
                return -ENOENT;
        else if (version >= 263)
                return 44;
        else if (version >= 256)
                return 40;
        else if (version >= 216)
                return 39;
        else if (version >= 196)
                return 38;
        else if (version >= 195)
                return 37;
        else if (version >= 111)
                return LEGACY_CHILD_DEVICE_CONFIG_SIZE;
        else if (version >= 106)
                return 27;
        else
                return 22;
}

static bool child_device_size_valid(struct intel_display *display, int size)
{
        int expected_size;

        expected_size = child_device_expected_size(display->vbt.version);
        if (expected_size < 0) {
                expected_size = sizeof(struct child_device_config);
                drm_dbg_kms(display->drm,
                            "Expected child device config size for VBT version %u not known; assuming %d\n",
                            display->vbt.version, expected_size);
        }

        /* Flag an error for unexpected size, but continue anyway. */
        if (size != expected_size)
                drm_err(display->drm,
                        "Unexpected child device config size %d (expected %d for VBT version %u)\n",
                        size, expected_size, display->vbt.version);

        /* The legacy sized child device config is the minimum we need. */
        if (size < LEGACY_CHILD_DEVICE_CONFIG_SIZE) {
                drm_dbg_kms(display->drm,
                            "Child device config size %d is too small.\n",
                            size);
                return false;
        }

        return true;
}

static void
parse_general_definitions(struct intel_display *display)
{
        const struct bdb_general_definitions *defs;
        struct intel_bios_encoder_data *devdata;
        const struct child_device_config *child;
        int i, child_device_num;
        u16 block_size;
        int bus_pin;

        defs = bdb_find_section(display, BDB_GENERAL_DEFINITIONS);
        if (!defs) {
                drm_dbg_kms(display->drm,
                            "No general definition block is found, no devices defined.\n");
                return;
        }

        block_size = get_blocksize(defs);
        if (block_size < sizeof(*defs)) {
                drm_dbg_kms(display->drm,
                            "General definitions block too small (%u)\n",
                            block_size);
                return;
        }

        bus_pin = defs->crt_ddc_gmbus_pin;
        drm_dbg_kms(display->drm, "crt_ddc_bus_pin: %d\n", bus_pin);
        if (intel_gmbus_is_valid_pin(display, bus_pin))
                display->vbt.crt_ddc_pin = bus_pin;

        if (!child_device_size_valid(display, defs->child_dev_size))
                return;

        /* get the number of child device */
        child_device_num = (block_size - sizeof(*defs)) / defs->child_dev_size;

        for (i = 0; i < child_device_num; i++) {
                child = child_device_ptr(defs, i);
                if (!child->device_type)
                        continue;

                drm_dbg_kms(display->drm,
                            "Found VBT child device with type 0x%x\n",
                            child->device_type);

                devdata = kzalloc_obj(*devdata);
                if (!devdata)
                        break;

                devdata->display = display;

                /*
                 * Copy as much as we know (sizeof) and is available
                 * (child_dev_size) of the child device config. Accessing the
                 * data must depend on VBT version.
                 */
                memcpy(&devdata->child, child,
                       min_t(size_t, defs->child_dev_size, sizeof(*child)));

                list_add_tail(&devdata->node, &display->vbt.display_devices);
        }

        if (list_empty(&display->vbt.display_devices))
                drm_dbg_kms(display->drm,
                            "no child dev is parsed from VBT\n");
}

/* Common defaults which may be overridden by VBT. */
static void
init_vbt_defaults(struct intel_display *display)
{
        display->vbt.crt_ddc_pin = GMBUS_PIN_VGADDC;

        /* general features */
        display->vbt.int_tv_support = 1;
        display->vbt.int_crt_support = 1;

        /* driver features */
        display->vbt.int_lvds_support = 1;

        /* Default to using SSC */
        display->vbt.lvds_use_ssc = 1;
        /*
         * Core/SandyBridge/IvyBridge use alternative (120MHz) reference
         * clock for LVDS.
         */
        display->vbt.lvds_ssc_freq = intel_bios_ssc_frequency(display,
                                                              !HAS_PCH_SPLIT(display));
        drm_dbg_kms(display->drm, "Set default to SSC at %d kHz\n",
                    display->vbt.lvds_ssc_freq);
}

/* Common defaults which may be overridden by VBT. */
static void
init_vbt_panel_defaults(struct intel_panel *panel)
{
        /* Default to having backlight */
        panel->vbt.backlight.present = true;

        /* LFP panel data */
        panel->vbt.lvds_dither = true;
}

/* Defaults to initialize only if there is no VBT. */
static void
init_vbt_missing_defaults(struct intel_display *display)
{
        unsigned int ports = DISPLAY_RUNTIME_INFO(display)->port_mask;
        enum port port;

        if (!HAS_DDI(display) && !display->platform.cherryview)
                return;

        for_each_port_masked(port, ports) {
                struct intel_bios_encoder_data *devdata;
                struct child_device_config *child;
                enum phy phy = intel_port_to_phy(display, port);

                /*
                 * VBT has the TypeC mode (native,TBT/USB) and we don't want
                 * to detect it.
                 */
                if (intel_phy_is_tc(display, phy))
                        continue;

                /* Create fake child device config */
                devdata = kzalloc_obj(*devdata);
                if (!devdata)
                        break;

                devdata->display = display;
                child = &devdata->child;

                if (port == PORT_F)
                        child->dvo_port = DVO_PORT_HDMIF;
                else if (port == PORT_E)
                        child->dvo_port = DVO_PORT_HDMIE;
                else
                        child->dvo_port = DVO_PORT_HDMIA + port;

                if (port != PORT_A && port != PORT_E)
                        child->device_type |= DEVICE_TYPE_TMDS_DVI_SIGNALING;

                if (port != PORT_E)
                        child->device_type |= DEVICE_TYPE_DISPLAYPORT_OUTPUT;

                if (port == PORT_A)
                        child->device_type |= DEVICE_TYPE_INTERNAL_CONNECTOR;

                list_add_tail(&devdata->node, &display->vbt.display_devices);

                drm_dbg_kms(display->drm,
                            "Generating default VBT child device with type 0x%04x on port %c\n",
                            child->device_type, port_name(port));
        }

        /* Bypass some minimum baseline VBT version checks */
        display->vbt.version = 155;
}

static const struct bdb_header *get_bdb_header(const struct vbt_header *vbt)
{
        const void *_vbt = vbt;

        return _vbt + vbt->bdb_offset;
}

static const char vbt_signature[] = "$VBT";
static const int vbt_signature_len = 4;

/**
 * intel_bios_is_valid_vbt - does the given buffer contain a valid VBT
 * @display:    display device
 * @buf:        pointer to a buffer to validate
 * @size:       size of the buffer
 *
 * Returns true on valid VBT.
 */
bool intel_bios_is_valid_vbt(struct intel_display *display,
                             const void *buf, size_t size)
{
        const struct vbt_header *vbt = buf;
        const struct bdb_header *bdb;

        if (!vbt)
                return false;

        if (sizeof(struct vbt_header) > size) {
                drm_dbg_kms(display->drm, "VBT header incomplete\n");
                return false;
        }

        if (memcmp(vbt->signature, vbt_signature, vbt_signature_len)) {
                drm_dbg_kms(display->drm, "VBT invalid signature\n");
                return false;
        }

        if (vbt->vbt_size > size) {
                drm_dbg_kms(display->drm,
                            "VBT incomplete (vbt_size overflows)\n");
                return false;
        }

        size = vbt->vbt_size;

        if (range_overflows_t(size_t,
                              vbt->bdb_offset,
                              sizeof(struct bdb_header),
                              size)) {
                drm_dbg_kms(display->drm, "BDB header incomplete\n");
                return false;
        }

        bdb = get_bdb_header(vbt);
        if (range_overflows_t(size_t, vbt->bdb_offset, bdb->bdb_size, size)) {
                drm_dbg_kms(display->drm, "BDB incomplete\n");
                return false;
        }

        return vbt;
}

static struct vbt_header *firmware_get_vbt(struct intel_display *display,
                                           size_t *size)
{
        struct vbt_header *vbt = NULL;
        const struct firmware *fw = NULL;
        const char *name = display->params.vbt_firmware;
        int ret;

        if (!name || !*name)
                return NULL;

        ret = request_firmware(&fw, name, display->drm->dev);
        if (ret) {
                drm_err(display->drm,
                        "Requesting VBT firmware \"%s\" failed (%d)\n",
                        name, ret);
                return NULL;
        }

        if (intel_bios_is_valid_vbt(display, fw->data, fw->size)) {
                vbt = kmemdup(fw->data, fw->size, GFP_KERNEL);
                if (vbt) {
                        drm_dbg_kms(display->drm,
                                    "Found valid VBT firmware \"%s\"\n", name);
                        if (size)
                                *size = fw->size;
                }
        } else {
                drm_dbg_kms(display->drm, "Invalid VBT firmware \"%s\"\n",
                            name);
        }

        release_firmware(fw);

        return vbt;
}

static struct vbt_header *oprom_get_vbt(struct intel_display *display,
                                        struct intel_rom *rom,
                                        size_t *size, const char *type)
{
        struct vbt_header *vbt;
        size_t vbt_size;
        loff_t offset;

        if (!rom)
                return NULL;

        BUILD_BUG_ON(vbt_signature_len != sizeof(vbt_signature) - 1);
        BUILD_BUG_ON(vbt_signature_len != sizeof(u32));

        offset = intel_rom_find(rom, *(const u32 *)vbt_signature);
        if (offset < 0)
                goto err_free_rom;

        if (sizeof(struct vbt_header) > intel_rom_size(rom) - offset) {
                drm_dbg_kms(display->drm, "VBT header incomplete\n");
                goto err_free_rom;
        }

        BUILD_BUG_ON(sizeof(vbt->vbt_size) != sizeof(u16));

        vbt_size = intel_rom_read16(rom, offset + offsetof(struct vbt_header, vbt_size));
        if (vbt_size > intel_rom_size(rom) - offset) {
                drm_dbg_kms(display->drm, "VBT incomplete (vbt_size overflows)\n");
                goto err_free_rom;
        }

        vbt = kzalloc(round_up(vbt_size, 4), GFP_KERNEL);
        if (!vbt)
                goto err_free_rom;

        intel_rom_read_block(rom, vbt, offset, vbt_size);

        if (!intel_bios_is_valid_vbt(display, vbt, vbt_size))
                goto err_free_vbt;

        drm_dbg_kms(display->drm, "Found valid VBT in %s\n", type);

        if (size)
                *size = vbt_size;

        intel_rom_free(rom);

        return vbt;

err_free_vbt:
        kfree(vbt);
err_free_rom:
        intel_rom_free(rom);
        return NULL;
}

static const struct vbt_header *intel_bios_get_vbt(struct intel_display *display,
                                                   size_t *sizep)
{
        const struct vbt_header *vbt = NULL;

        vbt = firmware_get_vbt(display, sizep);

        if (!vbt)
                vbt = intel_opregion_get_vbt(display, sizep);

        /*
         * If the OpRegion does not have VBT, look in SPI flash
         * through MMIO or PCI mapping
         */
        if (!vbt && display->platform.dgfx)
                with_intel_display_rpm(display)
                        vbt = oprom_get_vbt(display, intel_rom_spi(display->drm), sizep, "SPI flash");

        if (!vbt)
                with_intel_display_rpm(display)
                        vbt = oprom_get_vbt(display, intel_rom_pci(display->drm), sizep, "PCI ROM");

        return vbt;
}

/**
 * intel_bios_init - find VBT and initialize settings from the BIOS
 * @display: display device instance
 *
 * Parse and initialize settings from the Video BIOS Tables (VBT). If the VBT
 * was not found in ACPI OpRegion, try to find it in PCI ROM first. Also
 * initialize some defaults if the VBT is not present at all.
 */
void intel_bios_init(struct intel_display *display)
{
        const struct vbt_header *vbt;
        const struct bdb_header *bdb;

        INIT_LIST_HEAD(&display->vbt.display_devices);
        INIT_LIST_HEAD(&display->vbt.bdb_blocks);

        if (!HAS_DISPLAY(display)) {
                drm_dbg_kms(display->drm,
                            "Skipping VBT init due to disabled display.\n");
                return;
        }

        init_vbt_defaults(display);

        vbt = intel_bios_get_vbt(display, NULL);

        if (!vbt)
                goto out;

        bdb = get_bdb_header(vbt);
        display->vbt.version = bdb->version;

        drm_dbg_kms(display->drm,
                    "VBT signature \"%.*s\", BDB version %d\n",
                    (int)sizeof(vbt->signature), vbt->signature,
                    display->vbt.version);

        init_bdb_blocks(display, bdb);

        /* Grab useful general definitions */
        parse_general_features(display);
        parse_general_definitions(display);
        parse_driver_features(display);

        /* Depends on child device list */
        parse_compression_parameters(display);

out:
        if (!vbt) {
                drm_info(display->drm,
                         "Failed to find VBIOS tables (VBT)\n");
                init_vbt_missing_defaults(display);
        }

        /* Further processing on pre-parsed or generated child device data */
        parse_sdvo_device_mapping(display);
        parse_ddi_ports(display);

        kfree(vbt);
}

static void intel_bios_init_panel(struct intel_display *display,
                                  struct intel_panel *panel,
                                  const struct intel_bios_encoder_data *devdata,
                                  const struct drm_edid *drm_edid,
                                  bool use_fallback)
{
        /* already have it? */
        if (panel->vbt.panel_type >= 0) {
                drm_WARN_ON(display->drm, !use_fallback);
                return;
        }

        panel->vbt.panel_type = get_panel_type(display, devdata,
                                               drm_edid, use_fallback);
        if (panel->vbt.panel_type < 0) {
                drm_WARN_ON(display->drm, use_fallback);
                return;
        }

        init_vbt_panel_defaults(panel);

        parse_panel_options(display, panel);
        parse_generic_dtd(display, panel);
        parse_lfp_data(display, panel);
        parse_lfp_backlight(display, panel);
        parse_sdvo_lvds_data(display, panel);
        parse_panel_driver_features(display, panel);
        parse_power_conservation_features(display, panel);
        parse_edp(display, panel);
        parse_psr(display, panel);
        parse_mipi_config(display, panel);
        parse_mipi_sequence(display, panel);
}

void intel_bios_init_panel_early(struct intel_display *display,
                                 struct intel_panel *panel,
                                 const struct intel_bios_encoder_data *devdata)
{
        intel_bios_init_panel(display, panel, devdata, NULL, false);
}

void intel_bios_init_panel_late(struct intel_display *display,
                                struct intel_panel *panel,
                                const struct intel_bios_encoder_data *devdata,
                                const struct drm_edid *drm_edid)
{
        intel_bios_init_panel(display, panel, devdata, drm_edid, true);
}

/**
 * intel_bios_driver_remove - Free any resources allocated by intel_bios_init()
 * @display: display device instance
 */
void intel_bios_driver_remove(struct intel_display *display)
{
        struct intel_bios_encoder_data *devdata, *nd;
        struct bdb_block_entry *entry, *ne;

        list_for_each_entry_safe(devdata, nd, &display->vbt.display_devices,
                                 node) {
                list_del(&devdata->node);
                kfree(devdata->dsc);
                kfree(devdata);
        }

        list_for_each_entry_safe(entry, ne, &display->vbt.bdb_blocks, node) {
                list_del(&entry->node);
                kfree(entry);
        }
}

void intel_bios_fini_panel(struct intel_panel *panel)
{
        kfree(panel->vbt.sdvo_lvds_vbt_mode);
        panel->vbt.sdvo_lvds_vbt_mode = NULL;
        kfree(panel->vbt.lfp_vbt_mode);
        panel->vbt.lfp_vbt_mode = NULL;
        kfree(panel->vbt.dsi.data);
        panel->vbt.dsi.data = NULL;
        kfree(panel->vbt.dsi.pps);
        panel->vbt.dsi.pps = NULL;
        kfree(panel->vbt.dsi.config);
        panel->vbt.dsi.config = NULL;
        kfree(panel->vbt.dsi.deassert_seq);
        panel->vbt.dsi.deassert_seq = NULL;
}

/**
 * intel_bios_is_tv_present - is integrated TV present in VBT
 * @display: display device instance
 *
 * Return true if TV is present. If no child devices were parsed from VBT,
 * assume TV is present.
 */
bool intel_bios_is_tv_present(struct intel_display *display)
{
        const struct intel_bios_encoder_data *devdata;

        if (!display->vbt.int_tv_support)
                return false;

        if (list_empty(&display->vbt.display_devices))
                return true;

        list_for_each_entry(devdata, &display->vbt.display_devices, node) {
                const struct child_device_config *child = &devdata->child;

                /*
                 * If the device type is not TV, continue.
                 */
                switch (child->device_type) {
                case DEVICE_TYPE_INT_TV:
                case DEVICE_TYPE_TV:
                case DEVICE_TYPE_TV_SVIDEO_COMPOSITE:
                        break;
                default:
                        continue;
                }
                /* Only when the addin_offset is non-zero, it is regarded
                 * as present.
                 */
                if (child->addin_offset)
                        return true;
        }

        return false;
}

/**
 * intel_bios_is_lvds_present - is LVDS present in VBT
 * @display: display device instance
 * @i2c_pin:    i2c pin for LVDS if present
 *
 * Return true if LVDS is present. If no child devices were parsed from VBT,
 * assume LVDS is present.
 */
bool intel_bios_is_lvds_present(struct intel_display *display, u8 *i2c_pin)
{
        const struct intel_bios_encoder_data *devdata;

        if (list_empty(&display->vbt.display_devices))
                return true;

        list_for_each_entry(devdata, &display->vbt.display_devices, node) {
                const struct child_device_config *child = &devdata->child;

                /* If the device type is not LFP, continue.
                 * We have to check both the new identifiers as well as the
                 * old for compatibility with some BIOSes.
                 */
                if (child->device_type != DEVICE_TYPE_INT_LFP &&
                    child->device_type != DEVICE_TYPE_LFP)
                        continue;

                if (intel_gmbus_is_valid_pin(display, child->i2c_pin))
                        *i2c_pin = child->i2c_pin;

                /* However, we cannot trust the BIOS writers to populate
                 * the VBT correctly.  Since LVDS requires additional
                 * information from AIM blocks, a non-zero addin offset is
                 * a good indicator that the LVDS is actually present.
                 */
                if (child->addin_offset)
                        return true;

                /* But even then some BIOS writers perform some black magic
                 * and instantiate the device without reference to any
                 * additional data.  Trust that if the VBT was written into
                 * the OpRegion then they have validated the LVDS's existence.
                 */
                return intel_opregion_vbt_present(display);
        }

        return false;
}

/**
 * intel_bios_is_port_present - is the specified digital port present
 * @display: display device instance
 * @port:       port to check
 *
 * Return true if the device in %port is present.
 */
bool intel_bios_is_port_present(struct intel_display *display, enum port port)
{
        const struct intel_bios_encoder_data *devdata;

        if (WARN_ON(!has_ddi_port_info(display)))
                return true;

        if (!is_port_valid(display, port))
                return false;

        list_for_each_entry(devdata, &display->vbt.display_devices, node) {
                const struct child_device_config *child = &devdata->child;

                if (dvo_port_to_port(display, child->dvo_port) == port)
                        return true;
        }

        return false;
}

bool intel_bios_encoder_supports_dp_dual_mode(const struct intel_bios_encoder_data *devdata)
{
        const struct child_device_config *child = &devdata->child;

        if (!devdata)
                return false;

        if (!intel_bios_encoder_supports_dp(devdata) ||
            !intel_bios_encoder_supports_hdmi(devdata))
                return false;

        if (dvo_port_type(child->dvo_port) == DVO_PORT_DPA)
                return true;

        /* Only accept a HDMI dvo_port as DP++ if it has an AUX channel */
        if (dvo_port_type(child->dvo_port) == DVO_PORT_HDMIA &&
            child->aux_channel != 0)
                return true;

        return false;
}

/**
 * intel_bios_is_dsi_present - is DSI present in VBT
 * @display: display device instance
 * @port:       port for DSI if present
 *
 * Return true if DSI is present, and return the port in %port.
 */
bool intel_bios_is_dsi_present(struct intel_display *display,
                               enum port *port)
{
        const struct intel_bios_encoder_data *devdata;

        list_for_each_entry(devdata, &display->vbt.display_devices, node) {
                const struct child_device_config *child = &devdata->child;
                u8 dvo_port = child->dvo_port;

                if (!(child->device_type & DEVICE_TYPE_MIPI_OUTPUT))
                        continue;

                if (dsi_dvo_port_to_port(display, dvo_port) == PORT_NONE) {
                        drm_dbg_kms(display->drm,
                                    "VBT has unsupported DSI port %c\n",
                                    port_name(dvo_port - DVO_PORT_MIPIA));
                        continue;
                }

                if (port)
                        *port = dsi_dvo_port_to_port(display, dvo_port);
                return true;
        }

        return false;
}

static void fill_dsc(struct intel_crtc_state *crtc_state,
                     struct dsc_compression_parameters_entry *dsc,
                     int dsc_max_bpc)
{
        struct intel_display *display = to_intel_display(crtc_state);
        struct drm_dsc_config *vdsc_cfg = &crtc_state->dsc.config;
        int bpc = 8;

        vdsc_cfg->dsc_version_major = dsc->version_major;
        vdsc_cfg->dsc_version_minor = dsc->version_minor;

        if (dsc->support_12bpc && dsc_max_bpc >= 12)
                bpc = 12;
        else if (dsc->support_10bpc && dsc_max_bpc >= 10)
                bpc = 10;
        else if (dsc->support_8bpc && dsc_max_bpc >= 8)
                bpc = 8;
        else
                drm_dbg_kms(display->drm, "VBT: Unsupported BPC %d for DCS\n",
                            dsc_max_bpc);

        crtc_state->pipe_bpp = bpc * 3;

        crtc_state->dsc.compressed_bpp_x16 = fxp_q4_from_int(min(crtc_state->pipe_bpp,
                                                                 VBT_DSC_MAX_BPP(dsc->max_bpp)));

        /*
         * FIXME: This is ugly, and slice count should take DSC engine
         * throughput etc. into account.
         *
         * Also, per spec DSI supports 1, 2, 3 or 4 horizontal slices.
         */
        if (dsc->slices_per_line & BIT(2)) {
                crtc_state->dsc.slice_count = 4;
        } else if (dsc->slices_per_line & BIT(1)) {
                crtc_state->dsc.slice_count = 2;
        } else {
                /* FIXME */
                if (!(dsc->slices_per_line & BIT(0)))
                        drm_dbg_kms(display->drm,
                                    "VBT: Unsupported DSC slice count for DSI\n");

                crtc_state->dsc.slice_count = 1;
        }

        if (crtc_state->hw.adjusted_mode.crtc_hdisplay %
            crtc_state->dsc.slice_count != 0)
                drm_dbg_kms(display->drm,
                            "VBT: DSC hdisplay %d not divisible by slice count %d\n",
                            crtc_state->hw.adjusted_mode.crtc_hdisplay,
                            crtc_state->dsc.slice_count);

        /*
         * The VBT rc_buffer_block_size and rc_buffer_size definitions
         * correspond to DP 1.4 DPCD offsets 0x62 and 0x63.
         */
        vdsc_cfg->rc_model_size = drm_dsc_dp_rc_buffer_size(dsc->rc_buffer_block_size,
                                                            dsc->rc_buffer_size);

        /* FIXME: DSI spec says bpc + 1 for this one */
        vdsc_cfg->line_buf_depth = VBT_DSC_LINE_BUFFER_DEPTH(dsc->line_buffer_depth);

        vdsc_cfg->block_pred_enable = dsc->block_prediction_enable;

        vdsc_cfg->slice_height = dsc->slice_height;
}

/* FIXME: initially DSI specific */
bool intel_bios_get_dsc_params(struct intel_encoder *encoder,
                               struct intel_crtc_state *crtc_state,
                               int dsc_max_bpc)
{
        struct intel_display *display = to_intel_display(encoder);
        const struct intel_bios_encoder_data *devdata;

        list_for_each_entry(devdata, &display->vbt.display_devices, node) {
                const struct child_device_config *child = &devdata->child;

                if (!(child->device_type & DEVICE_TYPE_MIPI_OUTPUT))
                        continue;

                if (dsi_dvo_port_to_port(display, child->dvo_port) == encoder->port) {
                        if (!devdata->dsc)
                                return false;

                        fill_dsc(crtc_state, devdata->dsc, dsc_max_bpc);

                        return true;
                }
        }

        return false;
}

static const u8 adlp_aux_ch_map[] = {
        [AUX_CH_A] = DP_AUX_A,
        [AUX_CH_B] = DP_AUX_B,
        [AUX_CH_C] = DP_AUX_C,
        [AUX_CH_D_XELPD] = DP_AUX_D,
        [AUX_CH_E_XELPD] = DP_AUX_E,
        [AUX_CH_USBC1] = DP_AUX_F,
        [AUX_CH_USBC2] = DP_AUX_G,
        [AUX_CH_USBC3] = DP_AUX_H,
        [AUX_CH_USBC4] = DP_AUX_I,
};

/*
 * ADL-S VBT uses PHY based mapping. Combo PHYs A,B,C,D,E
 * map to DDI A,TC1,TC2,TC3,TC4 respectively.
 */
static const u8 adls_aux_ch_map[] = {
        [AUX_CH_A] = DP_AUX_A,
        [AUX_CH_USBC1] = DP_AUX_B,
        [AUX_CH_USBC2] = DP_AUX_C,
        [AUX_CH_USBC3] = DP_AUX_D,
        [AUX_CH_USBC4] = DP_AUX_E,
};

/*
 * RKL/DG1 VBT uses PHY based mapping. Combo PHYs A,B,C,D
 * map to DDI A,B,TC1,TC2 respectively.
 */
static const u8 rkl_aux_ch_map[] = {
        [AUX_CH_A] = DP_AUX_A,
        [AUX_CH_B] = DP_AUX_B,
        [AUX_CH_USBC1] = DP_AUX_C,
        [AUX_CH_USBC2] = DP_AUX_D,
};

static const u8 direct_aux_ch_map[] = {
        [AUX_CH_A] = DP_AUX_A,
        [AUX_CH_B] = DP_AUX_B,
        [AUX_CH_C] = DP_AUX_C,
        [AUX_CH_D] = DP_AUX_D, /* aka AUX_CH_USBC1 */
        [AUX_CH_E] = DP_AUX_E, /* aka AUX_CH_USBC2 */
        [AUX_CH_F] = DP_AUX_F, /* aka AUX_CH_USBC3 */
        [AUX_CH_G] = DP_AUX_G, /* aka AUX_CH_USBC4 */
        [AUX_CH_H] = DP_AUX_H, /* aka AUX_CH_USBC5 */
        [AUX_CH_I] = DP_AUX_I, /* aka AUX_CH_USBC6 */
};

static enum aux_ch map_aux_ch(struct intel_display *display, u8 aux_channel)
{
        const u8 *aux_ch_map;
        int i, n_entries;

        if (DISPLAY_VER(display) >= 13) {
                aux_ch_map = adlp_aux_ch_map;
                n_entries = ARRAY_SIZE(adlp_aux_ch_map);
        } else if (display->platform.alderlake_s) {
                aux_ch_map = adls_aux_ch_map;
                n_entries = ARRAY_SIZE(adls_aux_ch_map);
        } else if (display->platform.dg1 || display->platform.rocketlake) {
                aux_ch_map = rkl_aux_ch_map;
                n_entries = ARRAY_SIZE(rkl_aux_ch_map);
        } else {
                aux_ch_map = direct_aux_ch_map;
                n_entries = ARRAY_SIZE(direct_aux_ch_map);
        }

        for (i = 0; i < n_entries; i++) {
                if (aux_ch_map[i] == aux_channel)
                        return i;
        }

        drm_dbg_kms(display->drm,
                    "Ignoring alternate AUX CH: VBT claims AUX 0x%x, which is not valid for this platform\n",
                    aux_channel);

        return AUX_CH_NONE;
}

enum aux_ch intel_bios_dp_aux_ch(const struct intel_bios_encoder_data *devdata)
{
        if (!devdata || !devdata->child.aux_channel)
                return AUX_CH_NONE;

        return map_aux_ch(devdata->display, devdata->child.aux_channel);
}

bool intel_bios_dp_has_shared_aux_ch(const struct intel_bios_encoder_data *devdata)
{
        struct intel_display *display;
        u8 aux_channel;
        int count = 0;

        if (!devdata || !devdata->child.aux_channel)
                return false;

        display = devdata->display;
        aux_channel = devdata->child.aux_channel;

        list_for_each_entry(devdata, &display->vbt.display_devices, node) {
                if (intel_bios_encoder_supports_dp(devdata) &&
                    aux_channel == devdata->child.aux_channel)
                        count++;
        }

        return count > 1;
}

int intel_bios_dp_boost_level(const struct intel_bios_encoder_data *devdata)
{
        if (!devdata || devdata->display->vbt.version < 196 || !devdata->child.iboost)
                return 0;

        return translate_iboost(devdata->display, devdata->child.dp_iboost_level);
}

int intel_bios_hdmi_boost_level(const struct intel_bios_encoder_data *devdata)
{
        if (!devdata || devdata->display->vbt.version < 196 || !devdata->child.iboost)
                return 0;

        return translate_iboost(devdata->display, devdata->child.hdmi_iboost_level);
}

int intel_bios_hdmi_ddc_pin(const struct intel_bios_encoder_data *devdata)
{
        if (!devdata || !devdata->child.ddc_pin)
                return 0;

        return map_ddc_pin(devdata->display, devdata->child.ddc_pin);
}

bool intel_bios_encoder_supports_typec_usb(const struct intel_bios_encoder_data *devdata)
{
        return devdata->display->vbt.version >= 195 && devdata->child.dp_usb_type_c;
}

bool intel_bios_encoder_supports_tbt(const struct intel_bios_encoder_data *devdata)
{
        return devdata->display->vbt.version >= 209 && devdata->child.tbt;
}

bool intel_bios_encoder_is_dedicated_external(const struct intel_bios_encoder_data *devdata)
{
        return devdata->display->vbt.version >= 264 &&
                devdata->child.dedicated_external;
}

bool intel_bios_encoder_supports_dyn_port_over_tc(const struct intel_bios_encoder_data *devdata)
{
        return devdata->display->vbt.version >= 264 &&
                devdata->child.dyn_port_over_tc;
}

bool intel_bios_encoder_lane_reversal(const struct intel_bios_encoder_data *devdata)
{
        return devdata && devdata->child.lane_reversal;
}

bool intel_bios_encoder_hpd_invert(const struct intel_bios_encoder_data *devdata)
{
        return devdata && devdata->child.hpd_invert;
}

const struct intel_bios_encoder_data *
intel_bios_encoder_data_lookup(struct intel_display *display, enum port port)
{
        struct intel_bios_encoder_data *devdata;

        list_for_each_entry(devdata, &display->vbt.display_devices, node) {
                if (intel_bios_encoder_port(devdata) == port)
                        return devdata;
        }

        return NULL;
}

void intel_bios_for_each_encoder(struct intel_display *display,
                                 void (*func)(struct intel_display *display,
                                              const struct intel_bios_encoder_data *devdata))
{
        struct intel_bios_encoder_data *devdata;

        list_for_each_entry(devdata, &display->vbt.display_devices, node)
                func(display, devdata);
}

static int intel_bios_vbt_show(struct seq_file *m, void *unused)
{
        struct intel_display *display = m->private;
        const void *vbt;
        size_t vbt_size;

        vbt = intel_bios_get_vbt(display, &vbt_size);

        if (vbt) {
                seq_write(m, vbt, vbt_size);
                kfree(vbt);
        }

        return 0;
}

DEFINE_SHOW_ATTRIBUTE(intel_bios_vbt);

void intel_bios_debugfs_register(struct intel_display *display)
{
        debugfs_create_file("i915_vbt", 0444, display->drm->debugfs_root,
                            display, &intel_bios_vbt_fops);
}