OSCL-LXR linux-6.0.1/​drivers/​gpu/​drm/​i915/​display/​intel_bios.c	Source navigation Diff markup Identifier search General search
	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 /*
  * 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 <drm/drm_edid.h>
 #include <drm/display/drm_dp_helper.h>
 #include <drm/display/drm_dsc_helper.h>
 
 #include "display/intel_display.h"
 #include "display/intel_display_types.h"
 #include "display/intel_gmbus.h"
 
 #include "i915_drv.h"
 #include "i915_reg.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 drm_i915_private *i915;
 
     struct child_device_config child;
     struct dsc_compression_parameters_entry *dsc;
     struct list_head node;
 };
 
 #define SLAVE_ADDR1 0x70
 #define SLAVE_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;
 }
 
 /* size of the block excluding the header */
 static u32 raw_block_size(const void *bdb, enum bdb_block_id section_id)
 {
     const void *block;
 
     block = find_raw_section(bdb, section_id);
     if (!block)
         return 0;
 
     return get_blocksize(block);
 }
 
 struct bdb_block_entry {
     struct list_head node;
     enum bdb_block_id section_id;
     u8 data[];
 };
 
 static const void *
 find_section(struct drm_i915_private *i915,
          enum bdb_block_id section_id)
 {
     struct bdb_block_entry *entry;
 
     list_for_each_entry(entry, &i915->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_PANEL_DTDS,
       .min_size = sizeof(struct bdb_sdvo_panel_dtds), },
     { .section_id = BDB_EDP,
       .min_size = sizeof(struct bdb_edp), },
     { .section_id = BDB_LVDS_OPTIONS,
       .min_size = sizeof(struct bdb_lvds_options), },
     /*
      * BDB_LVDS_LFP_DATA depends on BDB_LVDS_LFP_DATA_PTRS,
      * so keep the two ordered.
      */
     { .section_id = BDB_LVDS_LFP_DATA_PTRS,
       .min_size = sizeof(struct bdb_lvds_lfp_data_ptrs), },
     { .section_id = BDB_LVDS_LFP_DATA,
       .min_size = 0, /* special case */ },
     { .section_id = BDB_LVDS_BACKLIGHT,
       .min_size = sizeof(struct bdb_lfp_backlight_data), },
     { .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 drm_i915_private *i915)
 {
     const struct bdb_lvds_lfp_data_ptrs *ptrs;
     size_t size;
 
     ptrs = find_section(i915, BDB_LVDS_LFP_DATA_PTRS);
     if (!ptrs)
         return 0;
 
     size = sizeof(struct bdb_lvds_lfp_data);
     if (ptrs->panel_name.table_size)
         size = max(size, ptrs->panel_name.offset +
                sizeof(struct bdb_lvds_lfp_data_tail));
 
     return size;
 }
 
 static bool validate_lfp_data_ptrs(const void *bdb,
                    const struct bdb_lvds_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;
     int i;
 
     data_block_size = raw_block_size(bdb, BDB_LVDS_LFP_DATA);
     if (data_block_size == 0)
         return false;
 
     /* always 3 indicating the presence of fp_timing+dvo_timing+panel_pnp_id */
     if (ptrs->lvds_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 lvds_dvo_timing) ||
         panel_pnp_id_size != sizeof(struct lvds_pnp_id))
         return false;
 
     /* panel_name is not present in old VBTs */
     if (panel_name_size != 0 &&
         panel_name_size != sizeof(struct lvds_lfp_panel_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;
 
     /*
      * 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 + dvo_timing_size + panel_pnp_id_size != lfp_data_size &&
         fp_timing_size + 6 + 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 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;
     }
 
     /* 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;
 
     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_lvds_lfp_data_ptrs *ptrs = ptrs_block;
     u32 offset;
     int i;
 
     offset = raw_block_offset(bdb, BDB_LVDS_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 const void *find_fp_timing_terminator(const u8 *data, int size)
 {
     int i;
 
     for (i = 0; i < size - 1; i++) {
         if (data[i] == 0xff && data[i+1] == 0xff)
             return &data[i];
     }
 
     return NULL;
 }
 
 static int make_lfp_data_ptr(struct lvds_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 lvds_lfp_data_ptr_table *next,
                   const struct lvds_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 drm_i915_private *i915,
                     const void *bdb)
 {
     int i, size, table_size, block_size, offset;
     const void *t0, *t1, *block;
     struct bdb_lvds_lfp_data_ptrs *ptrs;
     void *ptrs_block;
 
     block = find_raw_section(bdb, BDB_LVDS_LFP_DATA);
     if (!block)
         return NULL;
 
     drm_dbg_kms(&i915->drm, "Generating LFP data table pointers\n");
 
     block_size = get_blocksize(block);
 
     size = block_size;
     t0 = find_fp_timing_terminator(block, size);
     if (!t0)
         return NULL;
 
     size -= t0 - block - 2;
     t1 = find_fp_timing_terminator(t0 + 2, size);
     if (!t1)
         return NULL;
 
     size = t1 - t0;
     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_LVDS_LFP_DATA_PTRS;
     *(u16 *)(ptrs_block + 1) = sizeof(*ptrs);
     ptrs = ptrs_block + 3;
 
     table_size = sizeof(struct lvds_pnp_id);
     size = make_lfp_data_ptr(&ptrs->ptr[0].panel_pnp_id, table_size, size);
 
     table_size = sizeof(struct lvds_dvo_timing);
     size = make_lfp_data_ptr(&ptrs->ptr[0].dvo_timing, table_size, size);
 
     table_size = t0 - block + 2;
     size = make_lfp_data_ptr(&ptrs->ptr[0].fp_timing, table_size, size);
 
     if (ptrs->ptr[0].fp_timing.table_size)
         ptrs->lvds_entries++;
     if (ptrs->ptr[0].dvo_timing.table_size)
         ptrs->lvds_entries++;
     if (ptrs->ptr[0].panel_pnp_id.table_size)
         ptrs->lvds_entries++;
 
     if (size != 0 || ptrs->lvds_entries != 3) {
         kfree(ptrs);
         return NULL;
     }
 
     size = t1 - t0;
     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);
     }
 
     size = t1 - t0;
     table_size = sizeof(struct lvds_lfp_panel_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 drm_i915_private *i915,
            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_LVDS_LFP_DATA_PTRS) {
         temp_block = generate_lfp_data_ptrs(i915, bdb);
         if (temp_block)
             block = temp_block + 3;
     }
     if (!block)
         return;
 
     drm_WARN(&i915->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(struct_size(entry, data, max(min_size, block_size) + 3),
             GFP_KERNEL);
     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(&i915->drm, "Found BDB block %d (size %zu, min size %zu)\n",
             section_id, block_size, min_size);
 
     if (section_id == BDB_LVDS_LFP_DATA_PTRS &&
         !fixup_lfp_data_ptrs(bdb, entry->data + 3)) {
         drm_err(&i915->drm, "VBT has malformed LFP data table pointers\n");
         kfree(entry);
         return;
     }
 
     list_add_tail(&entry->node, &i915->vbt.bdb_blocks);
 }
 
 static void init_bdb_blocks(struct drm_i915_private *i915,
                 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_LVDS_LFP_DATA)
             min_size = lfp_data_min_size(i915);
 
         init_bdb_block(i915, bdb, section_id, min_size);
     }
 }
 
 static void
 fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
             const struct lvds_dvo_timing *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/vtotal values */
     if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
         panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
     if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
         panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
 
     drm_mode_set_name(panel_fixed_mode);
 }
 
 static const struct lvds_dvo_timing *
 get_lvds_dvo_timing(const struct bdb_lvds_lfp_data *data,
             const struct bdb_lvds_lfp_data_ptrs *ptrs,
             int index)
 {
     return (const void *)data + ptrs->ptr[index].dvo_timing.offset;
 }
 
 static const struct lvds_fp_timing *
 get_lvds_fp_timing(const struct bdb_lvds_lfp_data *data,
            const struct bdb_lvds_lfp_data_ptrs *ptrs,
            int index)
 {
     return (const void *)data + ptrs->ptr[index].fp_timing.offset;
 }
 
 static const struct lvds_pnp_id *
 get_lvds_pnp_id(const struct bdb_lvds_lfp_data *data,
         const struct bdb_lvds_lfp_data_ptrs *ptrs,
         int index)
 {
     return (const void *)data + ptrs->ptr[index].panel_pnp_id.offset;
 }
 
 static const struct bdb_lvds_lfp_data_tail *
 get_lfp_data_tail(const struct bdb_lvds_lfp_data *data,
           const struct bdb_lvds_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 drm_i915_private *i915,
                    const struct intel_bios_encoder_data *devdata,
                    const struct edid *edid)
 {
     return intel_opregion_get_panel_type(i915);
 }
 
 static int vbt_get_panel_type(struct drm_i915_private *i915,
                   const struct intel_bios_encoder_data *devdata,
                   const struct edid *edid)
 {
     const struct bdb_lvds_options *lvds_options;
 
     lvds_options = find_section(i915, BDB_LVDS_OPTIONS);
     if (!lvds_options)
         return -1;
 
     if (lvds_options->panel_type > 0xf &&
         lvds_options->panel_type != 0xff) {
         drm_dbg_kms(&i915->drm, "Invalid VBT panel type 0x%x\n",
                 lvds_options->panel_type);
         return -1;
     }
 
     if (devdata && devdata->child.handle == DEVICE_HANDLE_LFP2)
         return lvds_options->panel_type2;
 
     drm_WARN_ON(&i915->drm, devdata && devdata->child.handle != DEVICE_HANDLE_LFP1);
 
     return lvds_options->panel_type;
 }
 
 static int pnpid_get_panel_type(struct drm_i915_private *i915,
                 const struct intel_bios_encoder_data *devdata,
                 const struct edid *edid)
 {
     const struct bdb_lvds_lfp_data *data;
     const struct bdb_lvds_lfp_data_ptrs *ptrs;
     const struct lvds_pnp_id *edid_id;
     struct lvds_pnp_id edid_id_nodate;
     int i, best = -1;
 
     if (!edid)
         return -1;
 
     edid_id = (const void *)&edid->mfg_id[0];
 
     edid_id_nodate = *edid_id;
     edid_id_nodate.mfg_week = 0;
     edid_id_nodate.mfg_year = 0;
 
     ptrs = find_section(i915, BDB_LVDS_LFP_DATA_PTRS);
     if (!ptrs)
         return -1;
 
     data = find_section(i915, BDB_LVDS_LFP_DATA);
     if (!data)
         return -1;
 
     for (i = 0; i < 16; i++) {
         const struct lvds_pnp_id *vbt_id =
             get_lvds_pnp_id(data, ptrs, i);
 
         /* full match? */
         if (!memcmp(vbt_id, edid_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, &edid_id_nodate, sizeof(*vbt_id)))
             best = i;
     }
 
     return best;
 }
 
 static int fallback_get_panel_type(struct drm_i915_private *i915,
                    const struct intel_bios_encoder_data *devdata,
                    const struct edid *edid)
 {
     return 0;
 }
 
 enum panel_type {
     PANEL_TYPE_OPREGION,
     PANEL_TYPE_VBT,
     PANEL_TYPE_PNPID,
     PANEL_TYPE_FALLBACK,
 };
 
 static int get_panel_type(struct drm_i915_private *i915,
               const struct intel_bios_encoder_data *devdata,
               const struct edid *edid)
 {
     struct {
         const char *name;
         int (*get_panel_type)(struct drm_i915_private *i915,
                       const struct intel_bios_encoder_data *devdata,
                       const struct edid *edid);
         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(i915, devdata, edid);
 
         drm_WARN_ON(&i915->drm, panel_types[i].panel_type > 0xf &&
                 panel_types[i].panel_type != 0xff);
 
         if (panel_types[i].panel_type >= 0)
             drm_dbg_kms(&i915->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(&i915->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 drm_i915_private *i915,
             struct intel_panel *panel)
 {
     const struct bdb_lvds_options *lvds_options;
     int panel_type = panel->vbt.panel_type;
     int drrs_mode;
 
     lvds_options = find_section(i915, BDB_LVDS_OPTIONS);
     if (!lvds_options)
         return;
 
     panel->vbt.lvds_dither = lvds_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(lvds_options) < 16)
         return;
 
     drrs_mode = panel_bits(lvds_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(&i915->drm, "DRRS supported mode is static\n");
         break;
     case 2:
         panel->vbt.drrs_type = DRRS_TYPE_SEAMLESS;
         drm_dbg_kms(&i915->drm,
                 "DRRS supported mode is seamless\n");
         break;
     default:
         panel->vbt.drrs_type = DRRS_TYPE_NONE;
         drm_dbg_kms(&i915->drm,
                 "DRRS not supported (VBT input)\n");
         break;
     }
 }
 
 static void
 parse_lfp_panel_dtd(struct drm_i915_private *i915,
             struct intel_panel *panel,
             const struct bdb_lvds_lfp_data *lvds_lfp_data,
             const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs)
 {
     const struct lvds_dvo_timing *panel_dvo_timing;
     const struct lvds_fp_timing *fp_timing;
     struct drm_display_mode *panel_fixed_mode;
     int panel_type = panel->vbt.panel_type;
 
     panel_dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
                            lvds_lfp_data_ptrs,
                            panel_type);
 
     panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
     if (!panel_fixed_mode)
         return;
 
     fill_detail_timing_data(panel_fixed_mode, panel_dvo_timing);
 
     panel->vbt.lfp_lvds_vbt_mode = panel_fixed_mode;
 
     drm_dbg_kms(&i915->drm,
             "Found panel mode in BIOS VBT legacy lfp table: " DRM_MODE_FMT "\n",
             DRM_MODE_ARG(panel_fixed_mode));
 
     fp_timing = get_lvds_fp_timing(lvds_lfp_data,
                        lvds_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(&i915->drm,
                 "VBT initial LVDS value %x\n",
                 panel->vbt.bios_lvds_val);
     }
 }
 
 static void
 parse_lfp_data(struct drm_i915_private *i915,
            struct intel_panel *panel)
 {
     const struct bdb_lvds_lfp_data *data;
     const struct bdb_lvds_lfp_data_tail *tail;
     const struct bdb_lvds_lfp_data_ptrs *ptrs;
     int panel_type = panel->vbt.panel_type;
 
     ptrs = find_section(i915, BDB_LVDS_LFP_DATA_PTRS);
     if (!ptrs)
         return;
 
     data = find_section(i915, BDB_LVDS_LFP_DATA);
     if (!data)
         return;
 
     if (!panel->vbt.lfp_lvds_vbt_mode)
         parse_lfp_panel_dtd(i915, panel, data, ptrs);
 
     tail = get_lfp_data_tail(data, ptrs);
     if (!tail)
         return;
 
     if (i915->vbt.version >= 188) {
         panel->vbt.seamless_drrs_min_refresh_rate =
             tail->seamless_drrs_min_refresh_rate[panel_type];
         drm_dbg_kms(&i915->drm,
                 "Seamless DRRS min refresh rate: %d Hz\n",
                 panel->vbt.seamless_drrs_min_refresh_rate);
     }
 }
 
 static void
 parse_generic_dtd(struct drm_i915_private *i915,
           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 (i915->vbt.version < 229)
         return;
 
     generic_dtd = find_section(i915, BDB_GENERIC_DTD);
     if (!generic_dtd)
         return;
 
     if (generic_dtd->gdtd_size < sizeof(struct generic_dtd_entry)) {
         drm_err(&i915->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(&i915->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(&i915->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(sizeof(*panel_fixed_mode), GFP_KERNEL);
     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(&i915->drm,
             "Found panel mode in BIOS VBT generic dtd table: " DRM_MODE_FMT "\n",
             DRM_MODE_ARG(panel_fixed_mode));
 
     panel->vbt.lfp_lvds_vbt_mode = panel_fixed_mode;
 }
 
 static void
 parse_lfp_backlight(struct drm_i915_private *i915,
             struct intel_panel *panel)
 {
     const struct bdb_lfp_backlight_data *backlight_data;
     const struct lfp_backlight_data_entry *entry;
     int panel_type = panel->vbt.panel_type;
     u16 level;
 
     backlight_data = find_section(i915, BDB_LVDS_BACKLIGHT);
     if (!backlight_data)
         return;
 
     if (backlight_data->entry_size != sizeof(backlight_data->data[0])) {
         drm_dbg_kms(&i915->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(&i915->drm,
                 "PWM backlight not present in VBT (type %u)\n",
                 entry->type);
         return;
     }
 
     panel->vbt.backlight.type = INTEL_BACKLIGHT_DISPLAY_DDI;
     if (i915->vbt.version >= 191) {
         size_t exp_size;
 
         if (i915->vbt.version >= 236)
             exp_size = sizeof(struct bdb_lfp_backlight_data);
         else if (i915->vbt.version >= 234)
             exp_size = EXP_BDB_LFP_BL_DATA_SIZE_REV_234;
         else
             exp_size = EXP_BDB_LFP_BL_DATA_SIZE_REV_191;
 
         if (get_blocksize(backlight_data) >= exp_size) {
             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 (i915->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 (i915->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(&i915->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;
     }
 
     drm_dbg_kms(&i915->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);
 }
 
 /* Try to find sdvo panel data */
 static void
 parse_sdvo_panel_data(struct drm_i915_private *i915,
               struct intel_panel *panel)
 {
     const struct bdb_sdvo_panel_dtds *dtds;
     struct drm_display_mode *panel_fixed_mode;
     int index;
 
     index = i915->params.vbt_sdvo_panel_type;
     if (index == -2) {
         drm_dbg_kms(&i915->drm,
                 "Ignore SDVO panel mode from BIOS VBT tables.\n");
         return;
     }
 
     if (index == -1) {
         const struct bdb_sdvo_lvds_options *sdvo_lvds_options;
 
         sdvo_lvds_options = find_section(i915, BDB_SDVO_LVDS_OPTIONS);
         if (!sdvo_lvds_options)
             return;
 
         index = sdvo_lvds_options->panel_type;
     }
 
     dtds = find_section(i915, BDB_SDVO_PANEL_DTDS);
     if (!dtds)
         return;
 
     panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
     if (!panel_fixed_mode)
         return;
 
     fill_detail_timing_data(panel_fixed_mode, &dtds->dtds[index]);
 
     panel->vbt.sdvo_lvds_vbt_mode = panel_fixed_mode;
 
     drm_dbg_kms(&i915->drm,
             "Found SDVO panel mode in BIOS VBT tables: " DRM_MODE_FMT "\n",
             DRM_MODE_ARG(panel_fixed_mode));
 }
 
 static int intel_bios_ssc_frequency(struct drm_i915_private *i915,
                     bool alternate)
 {
     switch (DISPLAY_VER(i915)) {
     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 drm_i915_private *i915)
 {
     const struct bdb_general_features *general;
 
     general = find_section(i915, BDB_GENERAL_FEATURES);
     if (!general)
         return;
 
     i915->vbt.int_tv_support = general->int_tv_support;
     /* int_crt_support can't be trusted on earlier platforms */
     if (i915->vbt.version >= 155 &&
         (HAS_DDI(i915) || IS_VALLEYVIEW(i915)))
         i915->vbt.int_crt_support = general->int_crt_support;
     i915->vbt.lvds_use_ssc = general->enable_ssc;
     i915->vbt.lvds_ssc_freq =
         intel_bios_ssc_frequency(i915, general->ssc_freq);
     i915->vbt.display_clock_mode = general->display_clock_mode;
     i915->vbt.fdi_rx_polarity_inverted = general->fdi_rx_polarity_inverted;
     if (i915->vbt.version >= 181) {
         i915->vbt.orientation = general->rotate_180 ?
             DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP :
             DRM_MODE_PANEL_ORIENTATION_NORMAL;
     } else {
         i915->vbt.orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
     }
 
     if (i915->vbt.version >= 249 && general->afc_startup_config) {
         i915->vbt.override_afc_startup = true;
         i915->vbt.override_afc_startup_val = general->afc_startup_config == 0x1 ? 0x0 : 0x7;
     }
 
     drm_dbg_kms(&i915->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",
             i915->vbt.int_tv_support,
             i915->vbt.int_crt_support,
             i915->vbt.lvds_use_ssc,
             i915->vbt.lvds_ssc_freq,
             i915->vbt.display_clock_mode,
             i915->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 drm_i915_private *i915)
 {
     struct sdvo_device_mapping *mapping;
     const struct intel_bios_encoder_data *devdata;
     const struct child_device_config *child;
     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(i915, 3, 7)) {
         drm_dbg_kms(&i915->drm, "Skipping SDVO device mapping\n");
         return;
     }
 
     list_for_each_entry(devdata, &i915->vbt.display_devices, node) {
         child = &devdata->child;
 
         if (child->slave_addr != SLAVE_ADDR1 &&
             child->slave_addr != SLAVE_ADDR2) {
             /*
              * If the slave 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(&i915->drm,
                     "Incorrect SDVO port. Skip it\n");
             continue;
         }
         drm_dbg_kms(&i915->drm,
                 "the SDVO device with slave addr %2x is found on"
                 " %s port\n",
                 child->slave_addr,
                 (child->dvo_port == DEVICE_PORT_DVOB) ?
                 "SDVOB" : "SDVOC");
         mapping = &i915->vbt.sdvo_mappings[child->dvo_port - 1];
         if (!mapping->initialized) {
             mapping->dvo_port = child->dvo_port;
             mapping->slave_addr = child->slave_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(&i915->drm,
                     "SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n",
                     mapping->dvo_port, mapping->slave_addr,
                     mapping->dvo_wiring, mapping->ddc_pin,
                     mapping->i2c_pin);
         } else {
             drm_dbg_kms(&i915->drm,
                     "Maybe one SDVO port is shared by "
                     "two SDVO device.\n");
         }
         if (child->slave2_addr) {
             /* Maybe this is a SDVO device with multiple inputs */
             /* And the mapping info is not added */
             drm_dbg_kms(&i915->drm,
                     "there exists the slave2_addr. Maybe this"
                     " is a SDVO device with multiple inputs.\n");
         }
         count++;
     }
 
     if (!count) {
         /* No SDVO device info is found */
         drm_dbg_kms(&i915->drm,
                 "No SDVO device info is found in VBT\n");
     }
 }
 
 static void
 parse_driver_features(struct drm_i915_private *i915)
 {
     const struct bdb_driver_features *driver;
 
     driver = find_section(i915, BDB_DRIVER_FEATURES);
     if (!driver)
         return;
 
     if (DISPLAY_VER(i915) >= 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)
             i915->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 (i915->vbt.version >= 134 &&
             driver->lvds_config != BDB_DRIVER_FEATURE_INT_LVDS &&
             driver->lvds_config != BDB_DRIVER_FEATURE_INT_SDVO_LVDS)
             i915->vbt.int_lvds_support = 0;
     }
 }
 
 static void
 parse_panel_driver_features(struct drm_i915_private *i915,
                 struct intel_panel *panel)
 {
     const struct bdb_driver_features *driver;
 
     driver = find_section(i915, BDB_DRIVER_FEATURES);
     if (!driver)
         return;
 
     if (i915->vbt.version < 228) {
         drm_dbg_kms(&i915->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 drm_i915_private *i915,
                   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 (i915->vbt.version < 228)
         return;
 
     power = find_section(i915, 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 (i915->vbt.version >= 232)
         panel->vbt.edp.hobl = panel_bool(power->hobl, panel_type);
 
     if (i915->vbt.version >= 233)
         panel->vbt.vrr = panel_bool(power->vrr_feature_enabled,
                         panel_type);
 }
 
 static void
 parse_edp(struct drm_i915_private *i915,
       struct intel_panel *panel)
 {
     const struct bdb_edp *edp;
     const struct edp_power_seq *edp_pps;
     const struct edp_fast_link_params *edp_link_params;
     int panel_type = panel->vbt.panel_type;
 
     edp = find_section(i915, 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_pps = &edp->power_seqs[panel_type];
     edp_link_params = &edp->fast_link_params[panel_type];
 
     panel->vbt.edp.pps = *edp_pps;
 
     if (i915->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(&i915->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(&i915->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(&i915->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(&i915->drm,
                 "VBT has unknown eDP voltage swing value %u\n",
                 edp_link_params->vswing);
         break;
     }
 
     if (i915->vbt.version >= 173) {
         u8 vswing;
 
         /* Don't read from VBT if module parameter has valid value*/
         if (i915->params.edp_vswing) {
             panel->vbt.edp.low_vswing =
                 i915->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 (i915->vbt.version >= 244)
         panel->vbt.edp.max_link_rate =
             edp->edp_max_port_link_rate[panel_type] * 20;
 }
 
 static void
 parse_psr(struct drm_i915_private *i915,
       struct intel_panel *panel)
 {
     const struct bdb_psr *psr;
     const struct psr_table *psr_table;
     int panel_type = panel->vbt.panel_type;
 
     psr = find_section(i915, BDB_PSR);
     if (!psr) {
         drm_dbg_kms(&i915->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;
 
     /* Allowed VBT values goes from 0 to 15 */
     panel->vbt.psr.idle_frames = psr_table->idle_frames < 0 ? 0 :
         psr_table->idle_frames > 15 ? 15 : 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 (i915->vbt.version >= 205 &&
         (DISPLAY_VER(i915) >= 9 && !IS_BROXTON(i915))) {
         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(&i915->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(&i915->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 (i915->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 drm_i915_private *i915,
                       struct intel_panel *panel,
                       enum port port)
 {
     enum port port_bc = DISPLAY_VER(i915) >= 11 ? PORT_B : PORT_C;
 
     if (!panel->vbt.dsi.config->dual_link || i915->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 drm_i915_private *i915,
           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(i915, &port))
         return;
 
     /* Initialize this to undefined indicating no generic MIPI support */
     panel->vbt.dsi.panel_id = MIPI_DSI_UNDEFINED_PANEL_ID;
 
     /* Block #40 is already parsed and panel_fixed_mode is
      * stored in i915->lfp_lvds_vbt_mode
      * resuse this when needed
      */
 
     /* Parse #52 for panel index used from panel_type already
      * parsed
      */
     start = find_section(i915, BDB_MIPI_CONFIG);
     if (!start) {
         drm_dbg_kms(&i915->drm, "No MIPI config BDB found");
         return;
     }
 
     drm_dbg(&i915->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(i915, 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(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_ERROR("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_ERROR("Invalid sequence block\n");
             return NULL;
         }
 
         if (current_id == panel_id) {
             *seq_size = current_size;
             return data + index;
         }
 
         index += current_size;
     }
 
     DRM_ERROR("Sequence block detected but no valid configuration\n");
 
     return NULL;
 }
 
 static int goto_next_sequence(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_ERROR("Unknown operation byte\n");
             return 0;
         }
     }
 
     return 0;
 }
 
 static int goto_next_sequence_v3(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_ERROR("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_ERROR("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_ERROR("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_ERROR("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 drm_i915_private *i915,
                           struct intel_panel *panel)
 {
     const u8 *data = panel->vbt.dsi.sequence[MIPI_SEQ_INIT_OTP];
     int index, len;
 
     if (drm_WARN_ON(&i915->drm,
             !data || panel->vbt.dsi.seq_version != 1))
         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 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 fixup_mipi_sequences(struct drm_i915_private *i915,
                  struct intel_panel *panel)
 {
     u8 *init_otp;
     int len;
 
     /* Limit this to VLV for now. */
     if (!IS_VALLEYVIEW(i915))
         return;
 
     /* Limit this to v1 vid-mode sequences */
     if (panel->vbt.dsi.config->is_cmd_mode ||
         panel->vbt.dsi.seq_version != 1)
         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(i915, panel);
     if (!len)
         return;
 
     drm_dbg_kms(&i915->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;
 }
 
 static void
 parse_mipi_sequence(struct drm_i915_private *i915,
             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 = find_section(i915, BDB_MIPI_SEQUENCE);
     if (!sequence) {
         drm_dbg_kms(&i915->drm,
                 "No MIPI Sequence found, parsing complete\n");
         return;
     }
 
     /* Fail gracefully for forward incompatible sequence block. */
     if (sequence->version >= 4) {
         drm_err(&i915->drm,
             "Unable to parse MIPI Sequence Block v%u\n",
             sequence->version);
         return;
     }
 
     drm_dbg(&i915->drm, "Found MIPI sequence block v%u\n",
         sequence->version);
 
     seq_data = find_panel_sequence_block(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(&i915->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(&i915->drm,
                     "Unsupported sequence %u\n", seq_id);
 
         panel->vbt.dsi.sequence[seq_id] = data + index;
 
         if (sequence->version >= 3)
             index = goto_next_sequence_v3(data, index, seq_size);
         else
             index = goto_next_sequence(data, index, seq_size);
         if (!index) {
             drm_err(&i915->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(i915, panel);
 
     drm_dbg(&i915->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 drm_i915_private *i915)
 {
     const struct bdb_compression_parameters *params;
     struct intel_bios_encoder_data *devdata;
     const struct child_device_config *child;
     u16 block_size;
     int index;
 
     if (i915->vbt.version < 198)
         return;
 
     params = find_section(i915, BDB_COMPRESSION_PARAMETERS);
     if (params) {
         /* Sanity checks */
         if (params->entry_size != sizeof(params->data[0])) {
             drm_dbg_kms(&i915->drm,
                     "VBT: unsupported compression param entry size\n");
             return;
         }
 
         block_size = get_blocksize(params);
         if (block_size < sizeof(*params)) {
             drm_dbg_kms(&i915->drm,
                     "VBT: expected 16 compression param entries\n");
             return;
         }
     }
 
     list_for_each_entry(devdata, &i915->vbt.display_devices, node) {
         child = &devdata->child;
 
         if (!child->compression_enable)
             continue;
 
         if (!params) {
             drm_dbg_kms(&i915->drm,
                     "VBT: compression params not available\n");
             continue;
         }
 
         if (child->compression_method_cps) {
             drm_dbg_kms(&i915->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(u8 val)
 {
     static const u8 mapping[] = { 1, 3, 7 }; /* See VBT spec */
 
     if (val >= ARRAY_SIZE(mapping)) {
         DRM_DEBUG_KMS("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 */
     [DDC_BUS_DDI_B] = GMBUS_PIN_1_BXT,
     [DDC_BUS_DDI_C] = GMBUS_PIN_2_BXT,
     [DDC_BUS_DDI_D] = GMBUS_PIN_4_CNP, /* sic */
     [DDC_BUS_DDI_F] = GMBUS_PIN_3_BXT, /* sic */
 };
 
 static const u8 icp_ddc_pin_map[] = {
     [ICL_DDC_BUS_DDI_A] = GMBUS_PIN_1_BXT,
     [ICL_DDC_BUS_DDI_B] = GMBUS_PIN_2_BXT,
     [TGL_DDC_BUS_DDI_C] = GMBUS_PIN_3_BXT,
     [ICL_DDC_BUS_PORT_1] = GMBUS_PIN_9_TC1_ICP,
     [ICL_DDC_BUS_PORT_2] = GMBUS_PIN_10_TC2_ICP,
     [ICL_DDC_BUS_PORT_3] = GMBUS_PIN_11_TC3_ICP,
     [ICL_DDC_BUS_PORT_4] = GMBUS_PIN_12_TC4_ICP,
     [TGL_DDC_BUS_PORT_5] = GMBUS_PIN_13_TC5_TGP,
     [TGL_DDC_BUS_PORT_6] = GMBUS_PIN_14_TC6_TGP,
 };
 
 static const u8 rkl_pch_tgp_ddc_pin_map[] = {
     [ICL_DDC_BUS_DDI_A] = GMBUS_PIN_1_BXT,
     [ICL_DDC_BUS_DDI_B] = GMBUS_PIN_2_BXT,
     [RKL_DDC_BUS_DDI_D] = GMBUS_PIN_9_TC1_ICP,
     [RKL_DDC_BUS_DDI_E] = GMBUS_PIN_10_TC2_ICP,
 };
 
 static const u8 adls_ddc_pin_map[] = {
     [ICL_DDC_BUS_DDI_A] = GMBUS_PIN_1_BXT,
     [ADLS_DDC_BUS_PORT_TC1] = GMBUS_PIN_9_TC1_ICP,
     [ADLS_DDC_BUS_PORT_TC2] = GMBUS_PIN_10_TC2_ICP,
     [ADLS_DDC_BUS_PORT_TC3] = GMBUS_PIN_11_TC3_ICP,
     [ADLS_DDC_BUS_PORT_TC4] = GMBUS_PIN_12_TC4_ICP,
 };
 
 static const u8 gen9bc_tgp_ddc_pin_map[] = {
     [DDC_BUS_DDI_B] = GMBUS_PIN_2_BXT,
     [DDC_BUS_DDI_C] = GMBUS_PIN_9_TC1_ICP,
     [DDC_BUS_DDI_D] = GMBUS_PIN_10_TC2_ICP,
 };
 
 static const u8 adlp_ddc_pin_map[] = {
     [ICL_DDC_BUS_DDI_A] = GMBUS_PIN_1_BXT,
     [ICL_DDC_BUS_DDI_B] = GMBUS_PIN_2_BXT,
     [ADLP_DDC_BUS_PORT_TC1] = GMBUS_PIN_9_TC1_ICP,
     [ADLP_DDC_BUS_PORT_TC2] = GMBUS_PIN_10_TC2_ICP,
     [ADLP_DDC_BUS_PORT_TC3] = GMBUS_PIN_11_TC3_ICP,
     [ADLP_DDC_BUS_PORT_TC4] = GMBUS_PIN_12_TC4_ICP,
 };
 
 static u8 map_ddc_pin(struct drm_i915_private *i915, u8 vbt_pin)
 {
     const u8 *ddc_pin_map;
     int n_entries;
 
     if (IS_ALDERLAKE_P(i915)) {
         ddc_pin_map = adlp_ddc_pin_map;
         n_entries = ARRAY_SIZE(adlp_ddc_pin_map);
     } else if (IS_ALDERLAKE_S(i915)) {
         ddc_pin_map = adls_ddc_pin_map;
         n_entries = ARRAY_SIZE(adls_ddc_pin_map);
     } else if (INTEL_PCH_TYPE(i915) >= PCH_DG1) {
         return vbt_pin;
     } else if (IS_ROCKETLAKE(i915) && INTEL_PCH_TYPE(i915) == 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(i915) && DISPLAY_VER(i915) == 9) {
         ddc_pin_map = gen9bc_tgp_ddc_pin_map;
         n_entries = ARRAY_SIZE(gen9bc_tgp_ddc_pin_map);
     } else if (INTEL_PCH_TYPE(i915) >= PCH_ICP) {
         ddc_pin_map = icp_ddc_pin_map;
         n_entries = ARRAY_SIZE(icp_ddc_pin_map);
     } else if (HAS_PCH_CNP(i915)) {
         ddc_pin_map = cnp_ddc_pin_map;
         n_entries = ARRAY_SIZE(cnp_ddc_pin_map);
     } else {
         /* Assuming direct map */
         return vbt_pin;
     }
 
     if (vbt_pin < n_entries && ddc_pin_map[vbt_pin] != 0)
         return ddc_pin_map[vbt_pin];
 
     drm_dbg_kms(&i915->drm,
             "Ignoring alternate pin: VBT claims DDC pin %d, which is not valid for this platform\n",
             vbt_pin);
     return 0;
 }
 
 static enum port get_port_by_ddc_pin(struct drm_i915_private *i915, u8 ddc_pin)
 {
     const struct intel_bios_encoder_data *devdata;
     enum port port;
 
     if (!ddc_pin)
         return PORT_NONE;
 
     for_each_port(port) {
         devdata = i915->vbt.ports[port];
 
         if (devdata && ddc_pin == devdata->child.ddc_pin)
             return port;
     }
 
     return PORT_NONE;
 }
 
 static void sanitize_ddc_pin(struct intel_bios_encoder_data *devdata,
                  enum port port)
 {
     struct drm_i915_private *i915 = devdata->i915;
     struct child_device_config *child;
     u8 mapped_ddc_pin;
     enum port p;
 
     if (!devdata->child.ddc_pin)
         return;
 
     mapped_ddc_pin = map_ddc_pin(i915, devdata->child.ddc_pin);
     if (!intel_gmbus_is_valid_pin(i915, mapped_ddc_pin)) {
         drm_dbg_kms(&i915->drm,
                 "Port %c has invalid DDC pin %d, "
                 "sticking to defaults\n",
                 port_name(port), mapped_ddc_pin);
         devdata->child.ddc_pin = 0;
         return;
     }
 
     p = get_port_by_ddc_pin(i915, devdata->child.ddc_pin);
     if (p == PORT_NONE)
         return;
 
     drm_dbg_kms(&i915->drm,
             "port %c trying to use the same DDC pin (0x%x) as port %c, "
             "disabling port %c DVI/HDMI support\n",
             port_name(port), mapped_ddc_pin,
             port_name(p), port_name(p));
 
     /*
      * If we have multiple ports supposedly sharing the pin, then dvi/hdmi
      * couldn't exist on the shared port. Otherwise they share the same ddc
      * pin and system couldn't communicate with them separately.
      *
      * Give inverse child device order the priority, last one wins. Yes,
      * there are real machines (eg. Asrock B250M-HDV) where VBT has both
      * port A and port E with the same AUX ch and we must pick port E :(
      */
     child = &i915->vbt.ports[p]->child;
 
     child->device_type &= ~DEVICE_TYPE_TMDS_DVI_SIGNALING;
     child->device_type |= DEVICE_TYPE_NOT_HDMI_OUTPUT;
 
     child->ddc_pin = 0;
 }
 
 static enum port get_port_by_aux_ch(struct drm_i915_private *i915, u8 aux_ch)
 {
     const struct intel_bios_encoder_data *devdata;
     enum port port;
 
     if (!aux_ch)
         return PORT_NONE;
 
     for_each_port(port) {
         devdata = i915->vbt.ports[port];
 
         if (devdata && aux_ch == devdata->child.aux_channel)
             return port;
     }
 
     return PORT_NONE;
 }
 
 static void sanitize_aux_ch(struct intel_bios_encoder_data *devdata,
                 enum port port)
 {
     struct drm_i915_private *i915 = devdata->i915;
     struct child_device_config *child;
     enum port p;
 
     p = get_port_by_aux_ch(i915, devdata->child.aux_channel);
     if (p == PORT_NONE)
         return;
 
     drm_dbg_kms(&i915->drm,
             "port %c trying to use the same AUX CH (0x%x) as port %c, "
             "disabling port %c DP support\n",
             port_name(port), devdata->child.aux_channel,
             port_name(p), port_name(p));
 
     /*
      * If we have multiple ports supposedly sharing the aux channel, then DP
      * couldn't exist on the shared port. Otherwise they share the same aux
      * channel and system couldn't communicate with them separately.
      *
      * Give inverse child device order the priority, last one wins. Yes,
      * there are real machines (eg. Asrock B250M-HDV) where VBT has both
      * port A and port E with the same AUX ch and we must pick port E :(
      */
     child = &i915->vbt.ports[p]->child;
 
     child->device_type &= ~DEVICE_TYPE_DISPLAYPORT_OUTPUT;
     child->aux_channel = 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 drm_i915_private *i915,
                   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(i915) == 13)
         return __dvo_port_to_port(ARRAY_SIZE(xelpd_port_mapping),
                       ARRAY_SIZE(xelpd_port_mapping[0]),
                       xelpd_port_mapping,
                       dvo_port);
     else if (IS_ALDERLAKE_S(i915))
         return __dvo_port_to_port(ARRAY_SIZE(adls_port_mapping),
                       ARRAY_SIZE(adls_port_mapping[0]),
                       adls_port_mapping,
                       dvo_port);
     else if (IS_DG1(i915) || IS_ROCKETLAKE(i915))
         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 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 int _intel_bios_dp_max_link_rate(const struct intel_bios_encoder_data *devdata)
 {
     if (!devdata || devdata->i915->vbt.version < 216)
         return 0;
 
     if (devdata->i915->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);
 }
 
 static void sanitize_device_type(struct intel_bios_encoder_data *devdata,
                  enum port port)
 {
     struct drm_i915_private *i915 = devdata->i915;
     bool is_hdmi;
 
     if (port != PORT_A || DISPLAY_VER(i915) >= 12)
         return;
 
     if (!intel_bios_encoder_supports_dvi(devdata))
         return;
 
     is_hdmi = intel_bios_encoder_supports_hdmi(devdata);
 
     drm_dbg_kms(&i915->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 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;
 }
 
 static 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;
 }
 
 static int _intel_bios_hdmi_level_shift(const struct intel_bios_encoder_data *devdata)
 {
     if (!devdata || devdata->i915->vbt.version < 158)
         return -1;
 
     return devdata->child.hdmi_level_shifter_value;
 }
 
 static int _intel_bios_max_tmds_clock(const struct intel_bios_encoder_data *devdata)
 {
     if (!devdata || devdata->i915->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 drm_i915_private *i915, 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 && IS_ICELAKE(i915))
         return IS_ICL_WITH_PORT_F(i915);
 
     return true;
 }
 
 static void print_ddi_port(const struct intel_bios_encoder_data *devdata,
                enum port port)
 {
     struct drm_i915_private *i915 = devdata->i915;
     const struct child_device_config *child = &devdata->child;
     bool is_dvi, is_hdmi, is_dp, is_edp, is_crt, supports_typec_usb, supports_tbt;
     int dp_boost_level, dp_max_link_rate, hdmi_boost_level, hdmi_level_shift, max_tmds_clock;
 
     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);
 
     supports_typec_usb = intel_bios_encoder_supports_typec_usb(devdata);
     supports_tbt = intel_bios_encoder_supports_tbt(devdata);
 
     drm_dbg_kms(&i915->drm,
             "Port %c VBT info: CRT:%d DVI:%d HDMI:%d DP:%d eDP:%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,
             HAS_LSPCON(i915) && child->lspcon,
             supports_typec_usb, supports_tbt,
             devdata->dsc != NULL);
 
     hdmi_level_shift = _intel_bios_hdmi_level_shift(devdata);
     if (hdmi_level_shift >= 0) {
         drm_dbg_kms(&i915->drm,
                 "Port %c VBT HDMI level shift: %d\n",
                 port_name(port), hdmi_level_shift);
     }
 
     max_tmds_clock = _intel_bios_max_tmds_clock(devdata);
     if (max_tmds_clock)
         drm_dbg_kms(&i915->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_encoder_dp_boost_level(devdata);
     if (dp_boost_level)
         drm_dbg_kms(&i915->drm,
                 "Port %c VBT (e)DP boost level: %d\n",
                 port_name(port), dp_boost_level);
 
     hdmi_boost_level = intel_bios_encoder_hdmi_boost_level(devdata);
     if (hdmi_boost_level)
         drm_dbg_kms(&i915->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(&i915->drm,
                 "Port %c VBT DP max link rate: %d\n",
                 port_name(port), dp_max_link_rate);
 }
 
 static void parse_ddi_port(struct intel_bios_encoder_data *devdata)
 {
     struct drm_i915_private *i915 = devdata->i915;
     const struct child_device_config *child = &devdata->child;
     enum port port;
 
     port = dvo_port_to_port(i915, child->dvo_port);
     if (port == PORT_NONE)
         return;
 
     if (!is_port_valid(i915, port)) {
         drm_dbg_kms(&i915->drm,
                 "VBT reports port %c as supported, but that can't be true: skipping\n",
                 port_name(port));
         return;
     }
 
     if (i915->vbt.ports[port]) {
         drm_dbg_kms(&i915->drm,
                 "More than one child device for port %c in VBT, using the first.\n",
                 port_name(port));
         return;
     }
 
     sanitize_device_type(devdata, port);
 
     if (intel_bios_encoder_supports_dvi(devdata))
         sanitize_ddc_pin(devdata, port);
 
     if (intel_bios_encoder_supports_dp(devdata))
         sanitize_aux_ch(devdata, port);
 
     i915->vbt.ports[port] = devdata;
 }
 
 static bool has_ddi_port_info(struct drm_i915_private *i915)
 {
     return DISPLAY_VER(i915) >= 5 || IS_G4X(i915);
 }
 
 static void parse_ddi_ports(struct drm_i915_private *i915)
 {
     struct intel_bios_encoder_data *devdata;
     enum port port;
 
     if (!has_ddi_port_info(i915))
         return;
 
     list_for_each_entry(devdata, &i915->vbt.display_devices, node)
         parse_ddi_port(devdata);
 
     for_each_port(port) {
         if (i915->vbt.ports[port])
             print_ddi_port(i915->vbt.ports[port], port);
     }
 }
 
 static void
 parse_general_definitions(struct drm_i915_private *i915)
 {
     const struct bdb_general_definitions *defs;
     struct intel_bios_encoder_data *devdata;
     const struct child_device_config *child;
     int i, child_device_num;
     u8 expected_size;
     u16 block_size;
     int bus_pin;
 
     defs = find_section(i915, BDB_GENERAL_DEFINITIONS);
     if (!defs) {
         drm_dbg_kms(&i915->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(&i915->drm,
                 "General definitions block too small (%u)\n",
                 block_size);
         return;
     }
 
     bus_pin = defs->crt_ddc_gmbus_pin;
     drm_dbg_kms(&i915->drm, "crt_ddc_bus_pin: %d\n", bus_pin);
     if (intel_gmbus_is_valid_pin(i915, bus_pin))
         i915->vbt.crt_ddc_pin = bus_pin;
 
     if (i915->vbt.version < 106) {
         expected_size = 22;
     } else if (i915->vbt.version < 111) {
         expected_size = 27;
     } else if (i915->vbt.version < 195) {
         expected_size = LEGACY_CHILD_DEVICE_CONFIG_SIZE;
     } else if (i915->vbt.version == 195) {
         expected_size = 37;
     } else if (i915->vbt.version <= 215) {
         expected_size = 38;
     } else if (i915->vbt.version <= 237) {
         expected_size = 39;
     } else {
         expected_size = sizeof(*child);
         BUILD_BUG_ON(sizeof(*child) < 39);
         drm_dbg(&i915->drm,
             "Expected child device config size for VBT version %u not known; assuming %u\n",
             i915->vbt.version, expected_size);
     }
 
     /* Flag an error for unexpected size, but continue anyway. */
     if (defs->child_dev_size != expected_size)
         drm_err(&i915->drm,
             "Unexpected child device config size %u (expected %u for VBT version %u)\n",
             defs->child_dev_size, expected_size, i915->vbt.version);
 
     /* The legacy sized child device config is the minimum we need. */
     if (defs->child_dev_size < LEGACY_CHILD_DEVICE_CONFIG_SIZE) {
         drm_dbg_kms(&i915->drm,
                 "Child device config size %u is too small.\n",
                 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(&i915->drm,
                 "Found VBT child device with type 0x%x\n",
                 child->device_type);
 
         devdata = kzalloc(sizeof(*devdata), GFP_KERNEL);
         if (!devdata)
             break;
 
         devdata->i915 = i915;
 
         /*
          * 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, &i915->vbt.display_devices);
     }
 
     if (list_empty(&i915->vbt.display_devices))
         drm_dbg_kms(&i915->drm,
                 "no child dev is parsed from VBT\n");
 }
 
 /* Common defaults which may be overridden by VBT. */
 static void
 init_vbt_defaults(struct drm_i915_private *i915)
 {
     i915->vbt.crt_ddc_pin = GMBUS_PIN_VGADDC;
 
     /* general features */
     i915->vbt.int_tv_support = 1;
     i915->vbt.int_crt_support = 1;
 
     /* driver features */
     i915->vbt.int_lvds_support = 1;
 
     /* Default to using SSC */
     i915->vbt.lvds_use_ssc = 1;
     /*
      * Core/SandyBridge/IvyBridge use alternative (120MHz) reference
      * clock for LVDS.
      */
     i915->vbt.lvds_ssc_freq = intel_bios_ssc_frequency(i915,
                                !HAS_PCH_SPLIT(i915));
     drm_dbg_kms(&i915->drm, "Set default to SSC at %d kHz\n",
             i915->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 drm_i915_private *i915)
 {
     enum port port;
     int ports = BIT(PORT_A) | BIT(PORT_B) | BIT(PORT_C) |
             BIT(PORT_D) | BIT(PORT_E) | BIT(PORT_F);
 
     if (!HAS_DDI(i915) && !IS_CHERRYVIEW(i915))
         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(i915, port);
 
         /*
          * VBT has the TypeC mode (native,TBT/USB) and we don't want
          * to detect it.
          */
         if (intel_phy_is_tc(i915, phy))
             continue;
 
         /* Create fake child device config */
         devdata = kzalloc(sizeof(*devdata), GFP_KERNEL);
         if (!devdata)
             break;
 
         devdata->i915 = i915;
         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, &i915->vbt.display_devices);
 
         drm_dbg_kms(&i915->drm,
                 "Generating default VBT child device with type 0x04%x on port %c\n",
                 child->device_type, port_name(port));
     }
 
     /* Bypass some minimum baseline VBT version checks */
     i915->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;
 }
 
 /**
  * intel_bios_is_valid_vbt - does the given buffer contain a valid VBT
  * @buf:    pointer to a buffer to validate
  * @size:   size of the buffer
  *
  * Returns true on valid VBT.
  */
 bool intel_bios_is_valid_vbt(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_DEBUG_DRIVER("VBT header incomplete\n");
         return false;
     }
 
     if (memcmp(vbt->signature, "$VBT", 4)) {
         DRM_DEBUG_DRIVER("VBT invalid signature\n");
         return false;
     }
 
     if (vbt->vbt_size > size) {
         DRM_DEBUG_DRIVER("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_DEBUG_DRIVER("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_DEBUG_DRIVER("BDB incomplete\n");
         return false;
     }
 
     return vbt;
 }
 
 static struct vbt_header *spi_oprom_get_vbt(struct drm_i915_private *i915)
 {
     u32 count, data, found, store = 0;
     u32 static_region, oprom_offset;
     u32 oprom_size = 0x200000;
     u16 vbt_size;
     u32 *vbt;
 
     static_region = intel_uncore_read(&i915->uncore, SPI_STATIC_REGIONS);
     static_region &= OPTIONROM_SPI_REGIONID_MASK;
     intel_uncore_write(&i915->uncore, PRIMARY_SPI_REGIONID, static_region);
 
     oprom_offset = intel_uncore_read(&i915->uncore, OROM_OFFSET);
     oprom_offset &= OROM_OFFSET_MASK;
 
     for (count = 0; count < oprom_size; count += 4) {
         intel_uncore_write(&i915->uncore, PRIMARY_SPI_ADDRESS, oprom_offset + count);
         data = intel_uncore_read(&i915->uncore, PRIMARY_SPI_TRIGGER);
 
         if (data == *((const u32 *)"$VBT")) {
             found = oprom_offset + count;
             break;
         }
     }
 
     if (count >= oprom_size)
         goto err_not_found;
 
     /* Get VBT size and allocate space for the VBT */
     intel_uncore_write(&i915->uncore, PRIMARY_SPI_ADDRESS, found +
            offsetof(struct vbt_header, vbt_size));
     vbt_size = intel_uncore_read(&i915->uncore, PRIMARY_SPI_TRIGGER);
     vbt_size &= 0xffff;
 
     vbt = kzalloc(round_up(vbt_size, 4), GFP_KERNEL);
     if (!vbt)
         goto err_not_found;
 
     for (count = 0; count < vbt_size; count += 4) {
         intel_uncore_write(&i915->uncore, PRIMARY_SPI_ADDRESS, found + count);
         data = intel_uncore_read(&i915->uncore, PRIMARY_SPI_TRIGGER);
         *(vbt + store++) = data;
     }
 
     if (!intel_bios_is_valid_vbt(vbt, vbt_size))
         goto err_free_vbt;
 
     drm_dbg_kms(&i915->drm, "Found valid VBT in SPI flash\n");
 
     return (struct vbt_header *)vbt;
 
 err_free_vbt:
     kfree(vbt);
 err_not_found:
     return NULL;
 }
 
 static struct vbt_header *oprom_get_vbt(struct drm_i915_private *i915)
 {
     struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
     void __iomem *p = NULL, *oprom;
     struct vbt_header *vbt;
     u16 vbt_size;
     size_t i, size;
 
     oprom = pci_map_rom(pdev, &size);
     if (!oprom)
         return NULL;
 
     /* Scour memory looking for the VBT signature. */
     for (i = 0; i + 4 < size; i += 4) {
         if (ioread32(oprom + i) != *((const u32 *)"$VBT"))
             continue;
 
         p = oprom + i;
         size -= i;
         break;
     }
 
     if (!p)
         goto err_unmap_oprom;
 
     if (sizeof(struct vbt_header) > size) {
         drm_dbg(&i915->drm, "VBT header incomplete\n");
         goto err_unmap_oprom;
     }
 
     vbt_size = ioread16(p + offsetof(struct vbt_header, vbt_size));
     if (vbt_size > size) {
         drm_dbg(&i915->drm,
             "VBT incomplete (vbt_size overflows)\n");
         goto err_unmap_oprom;
     }
 
     /* The rest will be validated by intel_bios_is_valid_vbt() */
     vbt = kmalloc(vbt_size, GFP_KERNEL);
     if (!vbt)
         goto err_unmap_oprom;
 
     memcpy_fromio(vbt, p, vbt_size);
 
     if (!intel_bios_is_valid_vbt(vbt, vbt_size))
         goto err_free_vbt;
 
     pci_unmap_rom(pdev, oprom);
 
     drm_dbg_kms(&i915->drm, "Found valid VBT in PCI ROM\n");
 
     return vbt;
 
 err_free_vbt:
     kfree(vbt);
 err_unmap_oprom:
     pci_unmap_rom(pdev, oprom);
 
     return NULL;
 }
 
 /**
  * intel_bios_init - find VBT and initialize settings from the BIOS
  * @i915: i915 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 drm_i915_private *i915)
 {
     const struct vbt_header *vbt = i915->opregion.vbt;
     struct vbt_header *oprom_vbt = NULL;
     const struct bdb_header *bdb;
 
     INIT_LIST_HEAD(&i915->vbt.display_devices);
     INIT_LIST_HEAD(&i915->vbt.bdb_blocks);
 
     if (!HAS_DISPLAY(i915)) {
         drm_dbg_kms(&i915->drm,
                 "Skipping VBT init due to disabled display.\n");
         return;
     }
 
     init_vbt_defaults(i915);
 
     /*
      * If the OpRegion does not have VBT, look in SPI flash through MMIO or
      * PCI mapping
      */
     if (!vbt && IS_DGFX(i915)) {
         oprom_vbt = spi_oprom_get_vbt(i915);
         vbt = oprom_vbt;
     }
 
     if (!vbt) {
         oprom_vbt = oprom_get_vbt(i915);
         vbt = oprom_vbt;
     }
 
     if (!vbt)
         goto out;
 
     bdb = get_bdb_header(vbt);
     i915->vbt.version = bdb->version;
 
     drm_dbg_kms(&i915->drm,
             "VBT signature \"%.*s\", BDB version %d\n",
             (int)sizeof(vbt->signature), vbt->signature, i915->vbt.version);
 
     init_bdb_blocks(i915, bdb);
 
     /* Grab useful general definitions */
     parse_general_features(i915);
     parse_general_definitions(i915);
     parse_driver_features(i915);
 
     /* Depends on child device list */
     parse_compression_parameters(i915);
 
 out:
     if (!vbt) {
         drm_info(&i915->drm,
              "Failed to find VBIOS tables (VBT)\n");
         init_vbt_missing_defaults(i915);
     }
 
     /* Further processing on pre-parsed or generated child device data */
     parse_sdvo_device_mapping(i915);
     parse_ddi_ports(i915);
 
     kfree(oprom_vbt);
 }
 
 void intel_bios_init_panel(struct drm_i915_private *i915,
                struct intel_panel *panel,
                const struct intel_bios_encoder_data *devdata,
                const struct edid *edid)
 {
     init_vbt_panel_defaults(panel);
 
     panel->vbt.panel_type = get_panel_type(i915, devdata, edid);
 
     parse_panel_options(i915, panel);
     parse_generic_dtd(i915, panel);
     parse_lfp_data(i915, panel);
     parse_lfp_backlight(i915, panel);
     parse_sdvo_panel_data(i915, panel);
     parse_panel_driver_features(i915, panel);
     parse_power_conservation_features(i915, panel);
     parse_edp(i915, panel);
     parse_psr(i915, panel);
     parse_mipi_config(i915, panel);
     parse_mipi_sequence(i915, panel);
 }
 
 /**
  * intel_bios_driver_remove - Free any resources allocated by intel_bios_init()
  * @i915: i915 device instance
  */
 void intel_bios_driver_remove(struct drm_i915_private *i915)
 {
     struct intel_bios_encoder_data *devdata, *nd;
     struct bdb_block_entry *entry, *ne;
 
     list_for_each_entry_safe(devdata, nd, &i915->vbt.display_devices, node) {
         list_del(&devdata->node);
         kfree(devdata->dsc);
         kfree(devdata);
     }
 
     list_for_each_entry_safe(entry, ne, &i915->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_lvds_vbt_mode);
     panel->vbt.lfp_lvds_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
  * @i915: i915 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 drm_i915_private *i915)
 {
     const struct intel_bios_encoder_data *devdata;
     const struct child_device_config *child;
 
     if (!i915->vbt.int_tv_support)
         return false;
 
     if (list_empty(&i915->vbt.display_devices))
         return true;
 
     list_for_each_entry(devdata, &i915->vbt.display_devices, node) {
         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
  * @i915:   i915 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 drm_i915_private *i915, u8 *i2c_pin)
 {
     const struct intel_bios_encoder_data *devdata;
     const struct child_device_config *child;
 
     if (list_empty(&i915->vbt.display_devices))
         return true;
 
     list_for_each_entry(devdata, &i915->vbt.display_devices, node) {
         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(i915, 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.
          */
         if (i915->opregion.vbt)
             return true;
     }
 
     return false;
 }
 
 /**
  * intel_bios_is_port_present - is the specified digital port present
  * @i915:   i915 device instance
  * @port:   port to check
  *
  * Return true if the device in %port is present.
  */
 bool intel_bios_is_port_present(struct drm_i915_private *i915, enum port port)
 {
     if (WARN_ON(!has_ddi_port_info(i915)))
         return true;
 
     return i915->vbt.ports[port];
 }
 
 /**
  * intel_bios_is_port_edp - is the device in given port eDP
  * @i915:   i915 device instance
  * @port:   port to check
  *
  * Return true if the device in %port is eDP.
  */
 bool intel_bios_is_port_edp(struct drm_i915_private *i915, enum port port)
 {
     const struct intel_bios_encoder_data *devdata =
         intel_bios_encoder_data_lookup(i915, port);
 
     return devdata && intel_bios_encoder_supports_edp(devdata);
 }
 
 static bool intel_bios_encoder_supports_dp_dual_mode(const struct intel_bios_encoder_data *devdata)
 {
     const struct child_device_config *child = &devdata->child;
 
     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;
 }
 
 bool intel_bios_is_port_dp_dual_mode(struct drm_i915_private *i915,
                      enum port port)
 {
     const struct intel_bios_encoder_data *devdata =
         intel_bios_encoder_data_lookup(i915, port);
 
     return devdata && intel_bios_encoder_supports_dp_dual_mode(devdata);
 }
 
 /**
  * intel_bios_is_dsi_present - is DSI present in VBT
  * @i915:   i915 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 drm_i915_private *i915,
                    enum port *port)
 {
     const struct intel_bios_encoder_data *devdata;
     const struct child_device_config *child;
     u8 dvo_port;
 
     list_for_each_entry(devdata, &i915->vbt.display_devices, node) {
         child = &devdata->child;
 
         if (!(child->device_type & DEVICE_TYPE_MIPI_OUTPUT))
             continue;
 
         dvo_port = child->dvo_port;
 
         if (dvo_port == DVO_PORT_MIPIA ||
             (dvo_port == DVO_PORT_MIPIB && DISPLAY_VER(i915) >= 11) ||
             (dvo_port == DVO_PORT_MIPIC && DISPLAY_VER(i915) < 11)) {
             if (port)
                 *port = dvo_port - DVO_PORT_MIPIA;
             return true;
         } else if (dvo_port == DVO_PORT_MIPIB ||
                dvo_port == DVO_PORT_MIPIC ||
                dvo_port == DVO_PORT_MIPID) {
             drm_dbg_kms(&i915->drm,
                     "VBT has unsupported DSI port %c\n",
                     port_name(dvo_port - DVO_PORT_MIPIA));
         }
     }
 
     return false;
 }
 
 static void fill_dsc(struct intel_crtc_state *crtc_state,
              struct dsc_compression_parameters_entry *dsc,
              int dsc_max_bpc)
 {
     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_DEBUG_KMS("VBT: Unsupported BPC %d for DCS\n",
                   dsc_max_bpc);
 
     crtc_state->pipe_bpp = bpc * 3;
 
     crtc_state->dsc.compressed_bpp = 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_DEBUG_KMS("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_DEBUG_KMS("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 drm_i915_private *i915 = to_i915(encoder->base.dev);
     const struct intel_bios_encoder_data *devdata;
     const struct child_device_config *child;
 
     list_for_each_entry(devdata, &i915->vbt.display_devices, node) {
         child = &devdata->child;
 
         if (!(child->device_type & DEVICE_TYPE_MIPI_OUTPUT))
             continue;
 
         if (child->dvo_port - DVO_PORT_MIPIA == encoder->port) {
             if (!devdata->dsc)
                 return false;
 
             if (crtc_state)
                 fill_dsc(crtc_state, devdata->dsc, dsc_max_bpc);
 
             return true;
         }
     }
 
     return false;
 }
 
 /**
  * intel_bios_is_port_hpd_inverted - is HPD inverted for %port
  * @i915:   i915 device instance
  * @port:   port to check
  *
  * Return true if HPD should be inverted for %port.
  */
 bool
 intel_bios_is_port_hpd_inverted(const struct drm_i915_private *i915,
                 enum port port)
 {
     const struct intel_bios_encoder_data *devdata = i915->vbt.ports[port];
 
     if (drm_WARN_ON_ONCE(&i915->drm,
                  !IS_GEMINILAKE(i915) && !IS_BROXTON(i915)))
         return false;
 
     return devdata && devdata->child.hpd_invert;
 }
 
 /**
  * intel_bios_is_lspcon_present - if LSPCON is attached on %port
  * @i915:   i915 device instance
  * @port:   port to check
  *
  * Return true if LSPCON is present on this port
  */
 bool
 intel_bios_is_lspcon_present(const struct drm_i915_private *i915,
                  enum port port)
 {
     const struct intel_bios_encoder_data *devdata = i915->vbt.ports[port];
 
     return HAS_LSPCON(i915) && devdata && devdata->child.lspcon;
 }
 
 /**
  * intel_bios_is_lane_reversal_needed - if lane reversal needed on port
  * @i915:       i915 device instance
  * @port:       port to check
  *
  * Return true if port requires lane reversal
  */
 bool
 intel_bios_is_lane_reversal_needed(const struct drm_i915_private *i915,
                    enum port port)
 {
     const struct intel_bios_encoder_data *devdata = i915->vbt.ports[port];
 
     return devdata && devdata->child.lane_reversal;
 }
 
 enum aux_ch intel_bios_port_aux_ch(struct drm_i915_private *i915,
                    enum port port)
 {
     const struct intel_bios_encoder_data *devdata = i915->vbt.ports[port];
     enum aux_ch aux_ch;
 
     if (!devdata || !devdata->child.aux_channel) {
         aux_ch = (enum aux_ch)port;
 
         drm_dbg_kms(&i915->drm,
                 "using AUX %c for port %c (platform default)\n",
                 aux_ch_name(aux_ch), port_name(port));
         return aux_ch;
     }
 
     /*
      * RKL/DG1 VBT uses PHY based mapping. Combo PHYs A,B,C,D
      * map to DDI A,B,TC1,TC2 respectively.
      *
      * ADL-S VBT uses PHY based mapping. Combo PHYs A,B,C,D,E
      * map to DDI A,TC1,TC2,TC3,TC4 respectively.
      */
     switch (devdata->child.aux_channel) {
     case DP_AUX_A:
         aux_ch = AUX_CH_A;
         break;
     case DP_AUX_B:
         if (IS_ALDERLAKE_S(i915))
             aux_ch = AUX_CH_USBC1;
         else
             aux_ch = AUX_CH_B;
         break;
     case DP_AUX_C:
         if (IS_ALDERLAKE_S(i915))
             aux_ch = AUX_CH_USBC2;
         else if (IS_DG1(i915) || IS_ROCKETLAKE(i915))
             aux_ch = AUX_CH_USBC1;
         else
             aux_ch = AUX_CH_C;
         break;
     case DP_AUX_D:
         if (DISPLAY_VER(i915) == 13)
             aux_ch = AUX_CH_D_XELPD;
         else if (IS_ALDERLAKE_S(i915))
             aux_ch = AUX_CH_USBC3;
         else if (IS_DG1(i915) || IS_ROCKETLAKE(i915))
             aux_ch = AUX_CH_USBC2;
         else
             aux_ch = AUX_CH_D;
         break;
     case DP_AUX_E:
         if (DISPLAY_VER(i915) == 13)
             aux_ch = AUX_CH_E_XELPD;
         else if (IS_ALDERLAKE_S(i915))
             aux_ch = AUX_CH_USBC4;
         else
             aux_ch = AUX_CH_E;
         break;
     case DP_AUX_F:
         if (DISPLAY_VER(i915) == 13)
             aux_ch = AUX_CH_USBC1;
         else
             aux_ch = AUX_CH_F;
         break;
     case DP_AUX_G:
         if (DISPLAY_VER(i915) == 13)
             aux_ch = AUX_CH_USBC2;
         else
             aux_ch = AUX_CH_G;
         break;
     case DP_AUX_H:
         if (DISPLAY_VER(i915) == 13)
             aux_ch = AUX_CH_USBC3;
         else
             aux_ch = AUX_CH_H;
         break;
     case DP_AUX_I:
         if (DISPLAY_VER(i915) == 13)
             aux_ch = AUX_CH_USBC4;
         else
             aux_ch = AUX_CH_I;
         break;
     default:
         MISSING_CASE(devdata->child.aux_channel);
         aux_ch = AUX_CH_A;
         break;
     }
 
     drm_dbg_kms(&i915->drm, "using AUX %c for port %c (VBT)\n",
             aux_ch_name(aux_ch), port_name(port));
 
     return aux_ch;
 }
 
 int intel_bios_max_tmds_clock(struct intel_encoder *encoder)
 {
     struct drm_i915_private *i915 = to_i915(encoder->base.dev);
     const struct intel_bios_encoder_data *devdata = i915->vbt.ports[encoder->port];
 
     return _intel_bios_max_tmds_clock(devdata);
 }
 
 /* This is an index in the HDMI/DVI DDI buffer translation table, or -1 */
 int intel_bios_hdmi_level_shift(struct intel_encoder *encoder)
 {
     struct drm_i915_private *i915 = to_i915(encoder->base.dev);
     const struct intel_bios_encoder_data *devdata = i915->vbt.ports[encoder->port];
 
     return _intel_bios_hdmi_level_shift(devdata);
 }
 
 int intel_bios_encoder_dp_boost_level(const struct intel_bios_encoder_data *devdata)
 {
     if (!devdata || devdata->i915->vbt.version < 196 || !devdata->child.iboost)
         return 0;
 
     return translate_iboost(devdata->child.dp_iboost_level);
 }
 
 int intel_bios_encoder_hdmi_boost_level(const struct intel_bios_encoder_data *devdata)
 {
     if (!devdata || devdata->i915->vbt.version < 196 || !devdata->child.iboost)
         return 0;
 
     return translate_iboost(devdata->child.hdmi_iboost_level);
 }
 
 int intel_bios_dp_max_link_rate(struct intel_encoder *encoder)
 {
     struct drm_i915_private *i915 = to_i915(encoder->base.dev);
     const struct intel_bios_encoder_data *devdata = i915->vbt.ports[encoder->port];
 
     return _intel_bios_dp_max_link_rate(devdata);
 }
 
 int intel_bios_alternate_ddc_pin(struct intel_encoder *encoder)
 {
     struct drm_i915_private *i915 = to_i915(encoder->base.dev);
     const struct intel_bios_encoder_data *devdata = i915->vbt.ports[encoder->port];
 
     if (!devdata || !devdata->child.ddc_pin)
         return 0;
 
     return map_ddc_pin(i915, devdata->child.ddc_pin);
 }
 
 bool intel_bios_encoder_supports_typec_usb(const struct intel_bios_encoder_data *devdata)
 {
     return devdata->i915->vbt.version >= 195 && devdata->child.dp_usb_type_c;
 }
 
 bool intel_bios_encoder_supports_tbt(const struct intel_bios_encoder_data *devdata)
 {
     return devdata->i915->vbt.version >= 209 && devdata->child.tbt;
 }
 
 const struct intel_bios_encoder_data *
 intel_bios_encoder_data_lookup(struct drm_i915_private *i915, enum port port)
 {
     return i915->vbt.ports[port];
 }