drivers/gpu/drm/i915/display/intel

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This source file includes following definitions.
_get_blocksize
get_blocksize
find_section
fill_detail_timing_data
get_lvds_dvo_timing
get_lvds_fp_timing
parse_lfp_panel_data
parse_lfp_backlight
parse_sdvo_panel_data
intel_bios_ssc_frequency
parse_general_features
child_device_ptr
parse_sdvo_device_mapping
parse_driver_features
parse_edp
parse_psr
parse_dsi_backlight_ports
parse_mipi_config
find_panel_sequence_block
goto_next_sequence
goto_next_sequence_v3
get_init_otp_deassert_fragment_len
fixup_mipi_sequences
parse_mipi_sequence
translate_iboost
get_port_by_ddc_pin
sanitize_ddc_pin
get_port_by_aux_ch
sanitize_aux_ch
map_ddc_pin
dvo_port_to_port
parse_ddi_port
parse_ddi_ports
parse_general_definitions
init_vbt_defaults
init_vbt_missing_defaults
get_bdb_header
intel_bios_is_valid_vbt
find_vbt
intel_bios_init
intel_bios_driver_remove
intel_bios_is_tv_present
intel_bios_is_lvds_present
intel_bios_is_port_present
intel_bios_is_port_edp
child_dev_is_dp_dual_mode
intel_bios_is_port_dp_dual_mode
intel_bios_is_dsi_present
intel_bios_is_port_hpd_inverted
intel_bios_is_lspcon_present
intel_bios_port_aux_ch
   1 /*
   2  * Copyright © 2006 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21  * SOFTWARE.
  22  *
  23  * Authors:
  24  *    Eric Anholt <eric@anholt.net>
  25  *
  26  */
  27 
  28 #include <drm/drm_dp_helper.h>
  29 #include <drm/i915_drm.h>
  30 
  31 #include "display/intel_display.h"
  32 #include "display/intel_gmbus.h"
  33 
  34 #include "i915_drv.h"
  35 
  36 #define _INTEL_BIOS_PRIVATE
  37 #include "intel_vbt_defs.h"
  38 
  39 /**
  40  * DOC: Video BIOS Table (VBT)
  41  *
  42  * The Video BIOS Table, or VBT, provides platform and board specific
  43  * configuration information to the driver that is not discoverable or available
  44  * through other means. The configuration is mostly related to display
  45  * hardware. The VBT is available via the ACPI OpRegion or, on older systems, in
  46  * the PCI ROM.
  47  *
  48  * The VBT consists of a VBT Header (defined as &struct vbt_header), a BDB
  49  * Header (&struct bdb_header), and a number of BIOS Data Blocks (BDB) that
  50  * contain the actual configuration information. The VBT Header, and thus the
  51  * VBT, begins with "$VBT" signature. The VBT Header contains the offset of the
  52  * BDB Header. The data blocks are concatenated after the BDB Header. The data
  53  * blocks have a 1-byte Block ID, 2-byte Block Size, and Block Size bytes of
  54  * data. (Block 53, the MIPI Sequence Block is an exception.)
  55  *
  56  * The driver parses the VBT during load. The relevant information is stored in
  57  * driver private data for ease of use, and the actual VBT is not read after
  58  * that.
  59  */
  60 
  61 #define SLAVE_ADDR1     0x70
  62 #define SLAVE_ADDR2     0x72
  63 
  64 /* Get BDB block size given a pointer to Block ID. */
  65 static u32 _get_blocksize(const u8 *block_base)
  66 {
  67         /* The MIPI Sequence Block v3+ has a separate size field. */
  68         if (*block_base == BDB_MIPI_SEQUENCE && *(block_base + 3) >= 3)
  69                 return *((const u32 *)(block_base + 4));
  70         else
  71                 return *((const u16 *)(block_base + 1));
  72 }
  73 
  74 /* Get BDB block size give a pointer to data after Block ID and Block Size. */
  75 static u32 get_blocksize(const void *block_data)
  76 {
  77         return _get_blocksize(block_data - 3);
  78 }
  79 
  80 static const void *
  81 find_section(const void *_bdb, enum bdb_block_id section_id)
  82 {
  83         const struct bdb_header *bdb = _bdb;
  84         const u8 *base = _bdb;
  85         int index = 0;
  86         u32 total, current_size;
  87         enum bdb_block_id current_id;
  88 
  89         /* skip to first section */
  90         index += bdb->header_size;
  91         total = bdb->bdb_size;
  92 
  93         /* walk the sections looking for section_id */
  94         while (index + 3 < total) {
  95                 current_id = *(base + index);
  96                 current_size = _get_blocksize(base + index);
  97                 index += 3;
  98 
  99                 if (index + current_size > total)
 100                         return NULL;
 101 
 102                 if (current_id == section_id)
 103                         return base + index;
 104 
 105                 index += current_size;
 106         }
 107 
 108         return NULL;
 109 }
 110 
 111 static void
 112 fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
 113                         const struct lvds_dvo_timing *dvo_timing)
 114 {
 115         panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
 116                 dvo_timing->hactive_lo;
 117         panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
 118                 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
 119         panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
 120                 ((dvo_timing->hsync_pulse_width_hi << 8) |
 121                         dvo_timing->hsync_pulse_width_lo);
 122         panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
 123                 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
 124 
 125         panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
 126                 dvo_timing->vactive_lo;
 127         panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
 128                 ((dvo_timing->vsync_off_hi << 4) | dvo_timing->vsync_off_lo);
 129         panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
 130                 ((dvo_timing->vsync_pulse_width_hi << 4) |
 131                         dvo_timing->vsync_pulse_width_lo);
 132         panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
 133                 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
 134         panel_fixed_mode->clock = dvo_timing->clock * 10;
 135         panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
 136 
 137         if (dvo_timing->hsync_positive)
 138                 panel_fixed_mode->flags |= DRM_MODE_FLAG_PHSYNC;
 139         else
 140                 panel_fixed_mode->flags |= DRM_MODE_FLAG_NHSYNC;
 141 
 142         if (dvo_timing->vsync_positive)
 143                 panel_fixed_mode->flags |= DRM_MODE_FLAG_PVSYNC;
 144         else
 145                 panel_fixed_mode->flags |= DRM_MODE_FLAG_NVSYNC;
 146 
 147         panel_fixed_mode->width_mm = (dvo_timing->himage_hi << 8) |
 148                 dvo_timing->himage_lo;
 149         panel_fixed_mode->height_mm = (dvo_timing->vimage_hi << 8) |
 150                 dvo_timing->vimage_lo;
 151 
 152         /* Some VBTs have bogus h/vtotal values */
 153         if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
 154                 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
 155         if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
 156                 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
 157 
 158         drm_mode_set_name(panel_fixed_mode);
 159 }
 160 
 161 static const struct lvds_dvo_timing *
 162 get_lvds_dvo_timing(const struct bdb_lvds_lfp_data *lvds_lfp_data,
 163                     const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs,
 164                     int index)
 165 {
 166         /*
 167          * the size of fp_timing varies on the different platform.
 168          * So calculate the DVO timing relative offset in LVDS data
 169          * entry to get the DVO timing entry
 170          */
 171 
 172         int lfp_data_size =
 173                 lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
 174                 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
 175         int dvo_timing_offset =
 176                 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset -
 177                 lvds_lfp_data_ptrs->ptr[0].fp_timing_offset;
 178         char *entry = (char *)lvds_lfp_data->data + lfp_data_size * index;
 179 
 180         return (struct lvds_dvo_timing *)(entry + dvo_timing_offset);
 181 }
 182 
 183 /* get lvds_fp_timing entry
 184  * this function may return NULL if the corresponding entry is invalid
 185  */
 186 static const struct lvds_fp_timing *
 187 get_lvds_fp_timing(const struct bdb_header *bdb,
 188                    const struct bdb_lvds_lfp_data *data,
 189                    const struct bdb_lvds_lfp_data_ptrs *ptrs,
 190                    int index)
 191 {
 192         size_t data_ofs = (const u8 *)data - (const u8 *)bdb;
 193         u16 data_size = ((const u16 *)data)[-1]; /* stored in header */
 194         size_t ofs;
 195 
 196         if (index >= ARRAY_SIZE(ptrs->ptr))
 197                 return NULL;
 198         ofs = ptrs->ptr[index].fp_timing_offset;
 199         if (ofs < data_ofs ||
 200             ofs + sizeof(struct lvds_fp_timing) > data_ofs + data_size)
 201                 return NULL;
 202         return (const struct lvds_fp_timing *)((const u8 *)bdb + ofs);
 203 }
 204 
 205 /* Try to find integrated panel data */
 206 static void
 207 parse_lfp_panel_data(struct drm_i915_private *dev_priv,
 208                      const struct bdb_header *bdb)
 209 {
 210         const struct bdb_lvds_options *lvds_options;
 211         const struct bdb_lvds_lfp_data *lvds_lfp_data;
 212         const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
 213         const struct lvds_dvo_timing *panel_dvo_timing;
 214         const struct lvds_fp_timing *fp_timing;
 215         struct drm_display_mode *panel_fixed_mode;
 216         int panel_type;
 217         int drrs_mode;
 218         int ret;
 219 
 220         lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
 221         if (!lvds_options)
 222                 return;
 223 
 224         dev_priv->vbt.lvds_dither = lvds_options->pixel_dither;
 225 
 226         ret = intel_opregion_get_panel_type(dev_priv);
 227         if (ret >= 0) {
 228                 WARN_ON(ret > 0xf);
 229                 panel_type = ret;
 230                 DRM_DEBUG_KMS("Panel type: %d (OpRegion)\n", panel_type);
 231         } else {
 232                 if (lvds_options->panel_type > 0xf) {
 233                         DRM_DEBUG_KMS("Invalid VBT panel type 0x%x\n",
 234                                       lvds_options->panel_type);
 235                         return;
 236                 }
 237                 panel_type = lvds_options->panel_type;
 238                 DRM_DEBUG_KMS("Panel type: %d (VBT)\n", panel_type);
 239         }
 240 
 241         dev_priv->vbt.panel_type = panel_type;
 242 
 243         drrs_mode = (lvds_options->dps_panel_type_bits
 244                                 >> (panel_type * 2)) & MODE_MASK;
 245         /*
 246          * VBT has static DRRS = 0 and seamless DRRS = 2.
 247          * The below piece of code is required to adjust vbt.drrs_type
 248          * to match the enum drrs_support_type.
 249          */
 250         switch (drrs_mode) {
 251         case 0:
 252                 dev_priv->vbt.drrs_type = STATIC_DRRS_SUPPORT;
 253                 DRM_DEBUG_KMS("DRRS supported mode is static\n");
 254                 break;
 255         case 2:
 256                 dev_priv->vbt.drrs_type = SEAMLESS_DRRS_SUPPORT;
 257                 DRM_DEBUG_KMS("DRRS supported mode is seamless\n");
 258                 break;
 259         default:
 260                 dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED;
 261                 DRM_DEBUG_KMS("DRRS not supported (VBT input)\n");
 262                 break;
 263         }
 264 
 265         lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
 266         if (!lvds_lfp_data)
 267                 return;
 268 
 269         lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
 270         if (!lvds_lfp_data_ptrs)
 271                 return;
 272 
 273         panel_dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
 274                                                lvds_lfp_data_ptrs,
 275                                                panel_type);
 276 
 277         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 278         if (!panel_fixed_mode)
 279                 return;
 280 
 281         fill_detail_timing_data(panel_fixed_mode, panel_dvo_timing);
 282 
 283         dev_priv->vbt.lfp_lvds_vbt_mode = panel_fixed_mode;
 284 
 285         DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n");
 286         drm_mode_debug_printmodeline(panel_fixed_mode);
 287 
 288         fp_timing = get_lvds_fp_timing(bdb, lvds_lfp_data,
 289                                        lvds_lfp_data_ptrs,
 290                                        panel_type);
 291         if (fp_timing) {
 292                 /* check the resolution, just to be sure */
 293                 if (fp_timing->x_res == panel_fixed_mode->hdisplay &&
 294                     fp_timing->y_res == panel_fixed_mode->vdisplay) {
 295                         dev_priv->vbt.bios_lvds_val = fp_timing->lvds_reg_val;
 296                         DRM_DEBUG_KMS("VBT initial LVDS value %x\n",
 297                                       dev_priv->vbt.bios_lvds_val);
 298                 }
 299         }
 300 }
 301 
 302 static void
 303 parse_lfp_backlight(struct drm_i915_private *dev_priv,
 304                     const struct bdb_header *bdb)
 305 {
 306         const struct bdb_lfp_backlight_data *backlight_data;
 307         const struct lfp_backlight_data_entry *entry;
 308         int panel_type = dev_priv->vbt.panel_type;
 309 
 310         backlight_data = find_section(bdb, BDB_LVDS_BACKLIGHT);
 311         if (!backlight_data)
 312                 return;
 313 
 314         if (backlight_data->entry_size != sizeof(backlight_data->data[0])) {
 315                 DRM_DEBUG_KMS("Unsupported backlight data entry size %u\n",
 316                               backlight_data->entry_size);
 317                 return;
 318         }
 319 
 320         entry = &backlight_data->data[panel_type];
 321 
 322         dev_priv->vbt.backlight.present = entry->type == BDB_BACKLIGHT_TYPE_PWM;
 323         if (!dev_priv->vbt.backlight.present) {
 324                 DRM_DEBUG_KMS("PWM backlight not present in VBT (type %u)\n",
 325                               entry->type);
 326                 return;
 327         }
 328 
 329         dev_priv->vbt.backlight.type = INTEL_BACKLIGHT_DISPLAY_DDI;
 330         if (bdb->version >= 191 &&
 331             get_blocksize(backlight_data) >= sizeof(*backlight_data)) {
 332                 const struct lfp_backlight_control_method *method;
 333 
 334                 method = &backlight_data->backlight_control[panel_type];
 335                 dev_priv->vbt.backlight.type = method->type;
 336                 dev_priv->vbt.backlight.controller = method->controller;
 337         }
 338 
 339         dev_priv->vbt.backlight.pwm_freq_hz = entry->pwm_freq_hz;
 340         dev_priv->vbt.backlight.active_low_pwm = entry->active_low_pwm;
 341         dev_priv->vbt.backlight.min_brightness = entry->min_brightness;
 342         DRM_DEBUG_KMS("VBT backlight PWM modulation frequency %u Hz, "
 343                       "active %s, min brightness %u, level %u, controller %u\n",
 344                       dev_priv->vbt.backlight.pwm_freq_hz,
 345                       dev_priv->vbt.backlight.active_low_pwm ? "low" : "high",
 346                       dev_priv->vbt.backlight.min_brightness,
 347                       backlight_data->level[panel_type],
 348                       dev_priv->vbt.backlight.controller);
 349 }
 350 
 351 /* Try to find sdvo panel data */
 352 static void
 353 parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
 354                       const struct bdb_header *bdb)
 355 {
 356         const struct bdb_sdvo_panel_dtds *dtds;
 357         struct drm_display_mode *panel_fixed_mode;
 358         int index;
 359 
 360         index = i915_modparams.vbt_sdvo_panel_type;
 361         if (index == -2) {
 362                 DRM_DEBUG_KMS("Ignore SDVO panel mode from BIOS VBT tables.\n");
 363                 return;
 364         }
 365 
 366         if (index == -1) {
 367                 const struct bdb_sdvo_lvds_options *sdvo_lvds_options;
 368 
 369                 sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
 370                 if (!sdvo_lvds_options)
 371                         return;
 372 
 373                 index = sdvo_lvds_options->panel_type;
 374         }
 375 
 376         dtds = find_section(bdb, BDB_SDVO_PANEL_DTDS);
 377         if (!dtds)
 378                 return;
 379 
 380         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 381         if (!panel_fixed_mode)
 382                 return;
 383 
 384         fill_detail_timing_data(panel_fixed_mode, &dtds->dtds[index]);
 385 
 386         dev_priv->vbt.sdvo_lvds_vbt_mode = panel_fixed_mode;
 387 
 388         DRM_DEBUG_KMS("Found SDVO panel mode in BIOS VBT tables:\n");
 389         drm_mode_debug_printmodeline(panel_fixed_mode);
 390 }
 391 
 392 static int intel_bios_ssc_frequency(struct drm_i915_private *dev_priv,
 393                                     bool alternate)
 394 {
 395         switch (INTEL_GEN(dev_priv)) {
 396         case 2:
 397                 return alternate ? 66667 : 48000;
 398         case 3:
 399         case 4:
 400                 return alternate ? 100000 : 96000;
 401         default:
 402                 return alternate ? 100000 : 120000;
 403         }
 404 }
 405 
 406 static void
 407 parse_general_features(struct drm_i915_private *dev_priv,
 408                        const struct bdb_header *bdb)
 409 {
 410         const struct bdb_general_features *general;
 411 
 412         general = find_section(bdb, BDB_GENERAL_FEATURES);
 413         if (!general)
 414                 return;
 415 
 416         dev_priv->vbt.int_tv_support = general->int_tv_support;
 417         /* int_crt_support can't be trusted on earlier platforms */
 418         if (bdb->version >= 155 &&
 419             (HAS_DDI(dev_priv) || IS_VALLEYVIEW(dev_priv)))
 420                 dev_priv->vbt.int_crt_support = general->int_crt_support;
 421         dev_priv->vbt.lvds_use_ssc = general->enable_ssc;
 422         dev_priv->vbt.lvds_ssc_freq =
 423                 intel_bios_ssc_frequency(dev_priv, general->ssc_freq);
 424         dev_priv->vbt.display_clock_mode = general->display_clock_mode;
 425         dev_priv->vbt.fdi_rx_polarity_inverted = general->fdi_rx_polarity_inverted;
 426         if (bdb->version >= 181) {
 427                 dev_priv->vbt.orientation = general->rotate_180 ?
 428                         DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP :
 429                         DRM_MODE_PANEL_ORIENTATION_NORMAL;
 430         } else {
 431                 dev_priv->vbt.orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
 432         }
 433         DRM_DEBUG_KMS("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",
 434                       dev_priv->vbt.int_tv_support,
 435                       dev_priv->vbt.int_crt_support,
 436                       dev_priv->vbt.lvds_use_ssc,
 437                       dev_priv->vbt.lvds_ssc_freq,
 438                       dev_priv->vbt.display_clock_mode,
 439                       dev_priv->vbt.fdi_rx_polarity_inverted);
 440 }
 441 
 442 static const struct child_device_config *
 443 child_device_ptr(const struct bdb_general_definitions *defs, int i)
 444 {
 445         return (const void *) &defs->devices[i * defs->child_dev_size];
 446 }
 447 
 448 static void
 449 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv, u8 bdb_version)
 450 {
 451         struct sdvo_device_mapping *mapping;
 452         const struct child_device_config *child;
 453         int i, count = 0;
 454 
 455         /*
 456          * Only parse SDVO mappings on gens that could have SDVO. This isn't
 457          * accurate and doesn't have to be, as long as it's not too strict.
 458          */
 459         if (!IS_GEN_RANGE(dev_priv, 3, 7)) {
 460                 DRM_DEBUG_KMS("Skipping SDVO device mapping\n");
 461                 return;
 462         }
 463 
 464         for (i = 0, count = 0; i < dev_priv->vbt.child_dev_num; i++) {
 465                 child = dev_priv->vbt.child_dev + i;
 466 
 467                 if (child->slave_addr != SLAVE_ADDR1 &&
 468                     child->slave_addr != SLAVE_ADDR2) {
 469                         /*
 470                          * If the slave address is neither 0x70 nor 0x72,
 471                          * it is not a SDVO device. Skip it.
 472                          */
 473                         continue;
 474                 }
 475                 if (child->dvo_port != DEVICE_PORT_DVOB &&
 476                     child->dvo_port != DEVICE_PORT_DVOC) {
 477                         /* skip the incorrect SDVO port */
 478                         DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n");
 479                         continue;
 480                 }
 481                 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
 482                               " %s port\n",
 483                               child->slave_addr,
 484                               (child->dvo_port == DEVICE_PORT_DVOB) ?
 485                               "SDVOB" : "SDVOC");
 486                 mapping = &dev_priv->vbt.sdvo_mappings[child->dvo_port - 1];
 487                 if (!mapping->initialized) {
 488                         mapping->dvo_port = child->dvo_port;
 489                         mapping->slave_addr = child->slave_addr;
 490                         mapping->dvo_wiring = child->dvo_wiring;
 491                         mapping->ddc_pin = child->ddc_pin;
 492                         mapping->i2c_pin = child->i2c_pin;
 493                         mapping->initialized = 1;
 494                         DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n",
 495                                       mapping->dvo_port,
 496                                       mapping->slave_addr,
 497                                       mapping->dvo_wiring,
 498                                       mapping->ddc_pin,
 499                                       mapping->i2c_pin);
 500                 } else {
 501                         DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
 502                                          "two SDVO device.\n");
 503                 }
 504                 if (child->slave2_addr) {
 505                         /* Maybe this is a SDVO device with multiple inputs */
 506                         /* And the mapping info is not added */
 507                         DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
 508                                 " is a SDVO device with multiple inputs.\n");
 509                 }
 510                 count++;
 511         }
 512 
 513         if (!count) {
 514                 /* No SDVO device info is found */
 515                 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
 516         }
 517 }
 518 
 519 static void
 520 parse_driver_features(struct drm_i915_private *dev_priv,
 521                       const struct bdb_header *bdb)
 522 {
 523         const struct bdb_driver_features *driver;
 524 
 525         driver = find_section(bdb, BDB_DRIVER_FEATURES);
 526         if (!driver)
 527                 return;
 528 
 529         if (INTEL_GEN(dev_priv) >= 5) {
 530                 /*
 531                  * Note that we consider BDB_DRIVER_FEATURE_INT_SDVO_LVDS
 532                  * to mean "eDP". The VBT spec doesn't agree with that
 533                  * interpretation, but real world VBTs seem to.
 534                  */
 535                 if (driver->lvds_config != BDB_DRIVER_FEATURE_INT_LVDS)
 536                         dev_priv->vbt.int_lvds_support = 0;
 537         } else {
 538                 /*
 539                  * FIXME it's not clear which BDB version has the LVDS config
 540                  * bits defined. Revision history in the VBT spec says:
 541                  * "0.92 | Add two definitions for VBT value of LVDS Active
 542                  *  Config (00b and 11b values defined) | 06/13/2005"
 543                  * but does not the specify the BDB version.
 544                  *
 545                  * So far version 134 (on i945gm) is the oldest VBT observed
 546                  * in the wild with the bits correctly populated. Version
 547                  * 108 (on i85x) does not have the bits correctly populated.
 548                  */
 549                 if (bdb->version >= 134 &&
 550                     driver->lvds_config != BDB_DRIVER_FEATURE_INT_LVDS &&
 551                     driver->lvds_config != BDB_DRIVER_FEATURE_INT_SDVO_LVDS)
 552                         dev_priv->vbt.int_lvds_support = 0;
 553         }
 554 
 555         DRM_DEBUG_KMS("DRRS State Enabled:%d\n", driver->drrs_enabled);
 556         /*
 557          * If DRRS is not supported, drrs_type has to be set to 0.
 558          * This is because, VBT is configured in such a way that
 559          * static DRRS is 0 and DRRS not supported is represented by
 560          * driver->drrs_enabled=false
 561          */
 562         if (!driver->drrs_enabled)
 563                 dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED;
 564         dev_priv->vbt.psr.enable = driver->psr_enabled;
 565 }
 566 
 567 static void
 568 parse_edp(struct drm_i915_private *dev_priv, const struct bdb_header *bdb)
 569 {
 570         const struct bdb_edp *edp;
 571         const struct edp_power_seq *edp_pps;
 572         const struct edp_fast_link_params *edp_link_params;
 573         int panel_type = dev_priv->vbt.panel_type;
 574 
 575         edp = find_section(bdb, BDB_EDP);
 576         if (!edp)
 577                 return;
 578 
 579         switch ((edp->color_depth >> (panel_type * 2)) & 3) {
 580         case EDP_18BPP:
 581                 dev_priv->vbt.edp.bpp = 18;
 582                 break;
 583         case EDP_24BPP:
 584                 dev_priv->vbt.edp.bpp = 24;
 585                 break;
 586         case EDP_30BPP:
 587                 dev_priv->vbt.edp.bpp = 30;
 588                 break;
 589         }
 590 
 591         /* Get the eDP sequencing and link info */
 592         edp_pps = &edp->power_seqs[panel_type];
 593         edp_link_params = &edp->fast_link_params[panel_type];
 594 
 595         dev_priv->vbt.edp.pps = *edp_pps;
 596 
 597         switch (edp_link_params->rate) {
 598         case EDP_RATE_1_62:
 599                 dev_priv->vbt.edp.rate = DP_LINK_BW_1_62;
 600                 break;
 601         case EDP_RATE_2_7:
 602                 dev_priv->vbt.edp.rate = DP_LINK_BW_2_7;
 603                 break;
 604         default:
 605                 DRM_DEBUG_KMS("VBT has unknown eDP link rate value %u\n",
 606                               edp_link_params->rate);
 607                 break;
 608         }
 609 
 610         switch (edp_link_params->lanes) {
 611         case EDP_LANE_1:
 612                 dev_priv->vbt.edp.lanes = 1;
 613                 break;
 614         case EDP_LANE_2:
 615                 dev_priv->vbt.edp.lanes = 2;
 616                 break;
 617         case EDP_LANE_4:
 618                 dev_priv->vbt.edp.lanes = 4;
 619                 break;
 620         default:
 621                 DRM_DEBUG_KMS("VBT has unknown eDP lane count value %u\n",
 622                               edp_link_params->lanes);
 623                 break;
 624         }
 625 
 626         switch (edp_link_params->preemphasis) {
 627         case EDP_PREEMPHASIS_NONE:
 628                 dev_priv->vbt.edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_0;
 629                 break;
 630         case EDP_PREEMPHASIS_3_5dB:
 631                 dev_priv->vbt.edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_1;
 632                 break;
 633         case EDP_PREEMPHASIS_6dB:
 634                 dev_priv->vbt.edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_2;
 635                 break;
 636         case EDP_PREEMPHASIS_9_5dB:
 637                 dev_priv->vbt.edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_3;
 638                 break;
 639         default:
 640                 DRM_DEBUG_KMS("VBT has unknown eDP pre-emphasis value %u\n",
 641                               edp_link_params->preemphasis);
 642                 break;
 643         }
 644 
 645         switch (edp_link_params->vswing) {
 646         case EDP_VSWING_0_4V:
 647                 dev_priv->vbt.edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_0;
 648                 break;
 649         case EDP_VSWING_0_6V:
 650                 dev_priv->vbt.edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_1;
 651                 break;
 652         case EDP_VSWING_0_8V:
 653                 dev_priv->vbt.edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_2;
 654                 break;
 655         case EDP_VSWING_1_2V:
 656                 dev_priv->vbt.edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_3;
 657                 break;
 658         default:
 659                 DRM_DEBUG_KMS("VBT has unknown eDP voltage swing value %u\n",
 660                               edp_link_params->vswing);
 661                 break;
 662         }
 663 
 664         if (bdb->version >= 173) {
 665                 u8 vswing;
 666 
 667                 /* Don't read from VBT if module parameter has valid value*/
 668                 if (i915_modparams.edp_vswing) {
 669                         dev_priv->vbt.edp.low_vswing =
 670                                 i915_modparams.edp_vswing == 1;
 671                 } else {
 672                         vswing = (edp->edp_vswing_preemph >> (panel_type * 4)) & 0xF;
 673                         dev_priv->vbt.edp.low_vswing = vswing == 0;
 674                 }
 675         }
 676 }
 677 
 678 static void
 679 parse_psr(struct drm_i915_private *dev_priv, const struct bdb_header *bdb)
 680 {
 681         const struct bdb_psr *psr;
 682         const struct psr_table *psr_table;
 683         int panel_type = dev_priv->vbt.panel_type;
 684 
 685         psr = find_section(bdb, BDB_PSR);
 686         if (!psr) {
 687                 DRM_DEBUG_KMS("No PSR BDB found.\n");
 688                 return;
 689         }
 690 
 691         psr_table = &psr->psr_table[panel_type];
 692 
 693         dev_priv->vbt.psr.full_link = psr_table->full_link;
 694         dev_priv->vbt.psr.require_aux_wakeup = psr_table->require_aux_to_wakeup;
 695 
 696         /* Allowed VBT values goes from 0 to 15 */
 697         dev_priv->vbt.psr.idle_frames = psr_table->idle_frames < 0 ? 0 :
 698                 psr_table->idle_frames > 15 ? 15 : psr_table->idle_frames;
 699 
 700         switch (psr_table->lines_to_wait) {
 701         case 0:
 702                 dev_priv->vbt.psr.lines_to_wait = PSR_0_LINES_TO_WAIT;
 703                 break;
 704         case 1:
 705                 dev_priv->vbt.psr.lines_to_wait = PSR_1_LINE_TO_WAIT;
 706                 break;
 707         case 2:
 708                 dev_priv->vbt.psr.lines_to_wait = PSR_4_LINES_TO_WAIT;
 709                 break;
 710         case 3:
 711                 dev_priv->vbt.psr.lines_to_wait = PSR_8_LINES_TO_WAIT;
 712                 break;
 713         default:
 714                 DRM_DEBUG_KMS("VBT has unknown PSR lines to wait %u\n",
 715                               psr_table->lines_to_wait);
 716                 break;
 717         }
 718 
 719         /*
 720          * New psr options 0=500us, 1=100us, 2=2500us, 3=0us
 721          * Old decimal value is wake up time in multiples of 100 us.
 722          */
 723         if (bdb->version >= 205 &&
 724             (IS_GEN9_BC(dev_priv) || IS_GEMINILAKE(dev_priv) ||
 725              INTEL_GEN(dev_priv) >= 10)) {
 726                 switch (psr_table->tp1_wakeup_time) {
 727                 case 0:
 728                         dev_priv->vbt.psr.tp1_wakeup_time_us = 500;
 729                         break;
 730                 case 1:
 731                         dev_priv->vbt.psr.tp1_wakeup_time_us = 100;
 732                         break;
 733                 case 3:
 734                         dev_priv->vbt.psr.tp1_wakeup_time_us = 0;
 735                         break;
 736                 default:
 737                         DRM_DEBUG_KMS("VBT tp1 wakeup time value %d is outside range[0-3], defaulting to max value 2500us\n",
 738                                         psr_table->tp1_wakeup_time);
 739                         /* fallthrough */
 740                 case 2:
 741                         dev_priv->vbt.psr.tp1_wakeup_time_us = 2500;
 742                         break;
 743                 }
 744 
 745                 switch (psr_table->tp2_tp3_wakeup_time) {
 746                 case 0:
 747                         dev_priv->vbt.psr.tp2_tp3_wakeup_time_us = 500;
 748                         break;
 749                 case 1:
 750                         dev_priv->vbt.psr.tp2_tp3_wakeup_time_us = 100;
 751                         break;
 752                 case 3:
 753                         dev_priv->vbt.psr.tp2_tp3_wakeup_time_us = 0;
 754                         break;
 755                 default:
 756                         DRM_DEBUG_KMS("VBT tp2_tp3 wakeup time value %d is outside range[0-3], defaulting to max value 2500us\n",
 757                                         psr_table->tp2_tp3_wakeup_time);
 758                         /* fallthrough */
 759                 case 2:
 760                         dev_priv->vbt.psr.tp2_tp3_wakeup_time_us = 2500;
 761                 break;
 762                 }
 763         } else {
 764                 dev_priv->vbt.psr.tp1_wakeup_time_us = psr_table->tp1_wakeup_time * 100;
 765                 dev_priv->vbt.psr.tp2_tp3_wakeup_time_us = psr_table->tp2_tp3_wakeup_time * 100;
 766         }
 767 
 768         if (bdb->version >= 226) {
 769                 u32 wakeup_time = psr->psr2_tp2_tp3_wakeup_time;
 770 
 771                 wakeup_time = (wakeup_time >> (2 * panel_type)) & 0x3;
 772                 switch (wakeup_time) {
 773                 case 0:
 774                         wakeup_time = 500;
 775                         break;
 776                 case 1:
 777                         wakeup_time = 100;
 778                         break;
 779                 case 3:
 780                         wakeup_time = 50;
 781                         break;
 782                 default:
 783                 case 2:
 784                         wakeup_time = 2500;
 785                         break;
 786                 }
 787                 dev_priv->vbt.psr.psr2_tp2_tp3_wakeup_time_us = wakeup_time;
 788         } else {
 789                 /* Reusing PSR1 wakeup time for PSR2 in older VBTs */
 790                 dev_priv->vbt.psr.psr2_tp2_tp3_wakeup_time_us = dev_priv->vbt.psr.tp2_tp3_wakeup_time_us;
 791         }
 792 }
 793 
 794 static void parse_dsi_backlight_ports(struct drm_i915_private *dev_priv,
 795                                       u16 version, enum port port)
 796 {
 797         if (!dev_priv->vbt.dsi.config->dual_link || version < 197) {
 798                 dev_priv->vbt.dsi.bl_ports = BIT(port);
 799                 if (dev_priv->vbt.dsi.config->cabc_supported)
 800                         dev_priv->vbt.dsi.cabc_ports = BIT(port);
 801 
 802                 return;
 803         }
 804 
 805         switch (dev_priv->vbt.dsi.config->dl_dcs_backlight_ports) {
 806         case DL_DCS_PORT_A:
 807                 dev_priv->vbt.dsi.bl_ports = BIT(PORT_A);
 808                 break;
 809         case DL_DCS_PORT_C:
 810                 dev_priv->vbt.dsi.bl_ports = BIT(PORT_C);
 811                 break;
 812         default:
 813         case DL_DCS_PORT_A_AND_C:
 814                 dev_priv->vbt.dsi.bl_ports = BIT(PORT_A) | BIT(PORT_C);
 815                 break;
 816         }
 817 
 818         if (!dev_priv->vbt.dsi.config->cabc_supported)
 819                 return;
 820 
 821         switch (dev_priv->vbt.dsi.config->dl_dcs_cabc_ports) {
 822         case DL_DCS_PORT_A:
 823                 dev_priv->vbt.dsi.cabc_ports = BIT(PORT_A);
 824                 break;
 825         case DL_DCS_PORT_C:
 826                 dev_priv->vbt.dsi.cabc_ports = BIT(PORT_C);
 827                 break;
 828         default:
 829         case DL_DCS_PORT_A_AND_C:
 830                 dev_priv->vbt.dsi.cabc_ports =
 831                                         BIT(PORT_A) | BIT(PORT_C);
 832                 break;
 833         }
 834 }
 835 
 836 static void
 837 parse_mipi_config(struct drm_i915_private *dev_priv,
 838                   const struct bdb_header *bdb)
 839 {
 840         const struct bdb_mipi_config *start;
 841         const struct mipi_config *config;
 842         const struct mipi_pps_data *pps;
 843         int panel_type = dev_priv->vbt.panel_type;
 844         enum port port;
 845 
 846         /* parse MIPI blocks only if LFP type is MIPI */
 847         if (!intel_bios_is_dsi_present(dev_priv, &port))
 848                 return;
 849 
 850         /* Initialize this to undefined indicating no generic MIPI support */
 851         dev_priv->vbt.dsi.panel_id = MIPI_DSI_UNDEFINED_PANEL_ID;
 852 
 853         /* Block #40 is already parsed and panel_fixed_mode is
 854          * stored in dev_priv->lfp_lvds_vbt_mode
 855          * resuse this when needed
 856          */
 857 
 858         /* Parse #52 for panel index used from panel_type already
 859          * parsed
 860          */
 861         start = find_section(bdb, BDB_MIPI_CONFIG);
 862         if (!start) {
 863                 DRM_DEBUG_KMS("No MIPI config BDB found");
 864                 return;
 865         }
 866 
 867         DRM_DEBUG_DRIVER("Found MIPI Config block, panel index = %d\n",
 868                                                                 panel_type);
 869 
 870         /*
 871          * get hold of the correct configuration block and pps data as per
 872          * the panel_type as index
 873          */
 874         config = &start->config[panel_type];
 875         pps = &start->pps[panel_type];
 876 
 877         /* store as of now full data. Trim when we realise all is not needed */
 878         dev_priv->vbt.dsi.config = kmemdup(config, sizeof(struct mipi_config), GFP_KERNEL);
 879         if (!dev_priv->vbt.dsi.config)
 880                 return;
 881 
 882         dev_priv->vbt.dsi.pps = kmemdup(pps, sizeof(struct mipi_pps_data), GFP_KERNEL);
 883         if (!dev_priv->vbt.dsi.pps) {
 884                 kfree(dev_priv->vbt.dsi.config);
 885                 return;
 886         }
 887 
 888         parse_dsi_backlight_ports(dev_priv, bdb->version, port);
 889 
 890         /* FIXME is the 90 vs. 270 correct? */
 891         switch (config->rotation) {
 892         case ENABLE_ROTATION_0:
 893                 /*
 894                  * Most (all?) VBTs claim 0 degrees despite having
 895                  * an upside down panel, thus we do not trust this.
 896                  */
 897                 dev_priv->vbt.dsi.orientation =
 898                         DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
 899                 break;
 900         case ENABLE_ROTATION_90:
 901                 dev_priv->vbt.dsi.orientation =
 902                         DRM_MODE_PANEL_ORIENTATION_RIGHT_UP;
 903                 break;
 904         case ENABLE_ROTATION_180:
 905                 dev_priv->vbt.dsi.orientation =
 906                         DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP;
 907                 break;
 908         case ENABLE_ROTATION_270:
 909                 dev_priv->vbt.dsi.orientation =
 910                         DRM_MODE_PANEL_ORIENTATION_LEFT_UP;
 911                 break;
 912         }
 913 
 914         /* We have mandatory mipi config blocks. Initialize as generic panel */
 915         dev_priv->vbt.dsi.panel_id = MIPI_DSI_GENERIC_PANEL_ID;
 916 }
 917 
 918 /* Find the sequence block and size for the given panel. */
 919 static const u8 *
 920 find_panel_sequence_block(const struct bdb_mipi_sequence *sequence,
 921                           u16 panel_id, u32 *seq_size)
 922 {
 923         u32 total = get_blocksize(sequence);
 924         const u8 *data = &sequence->data[0];
 925         u8 current_id;
 926         u32 current_size;
 927         int header_size = sequence->version >= 3 ? 5 : 3;
 928         int index = 0;
 929         int i;
 930 
 931         /* skip new block size */
 932         if (sequence->version >= 3)
 933                 data += 4;
 934 
 935         for (i = 0; i < MAX_MIPI_CONFIGURATIONS && index < total; i++) {
 936                 if (index + header_size > total) {
 937                         DRM_ERROR("Invalid sequence block (header)\n");
 938                         return NULL;
 939                 }
 940 
 941                 current_id = *(data + index);
 942                 if (sequence->version >= 3)
 943                         current_size = *((const u32 *)(data + index + 1));
 944                 else
 945                         current_size = *((const u16 *)(data + index + 1));
 946 
 947                 index += header_size;
 948 
 949                 if (index + current_size > total) {
 950                         DRM_ERROR("Invalid sequence block\n");
 951                         return NULL;
 952                 }
 953 
 954                 if (current_id == panel_id) {
 955                         *seq_size = current_size;
 956                         return data + index;
 957                 }
 958 
 959                 index += current_size;
 960         }
 961 
 962         DRM_ERROR("Sequence block detected but no valid configuration\n");
 963 
 964         return NULL;
 965 }
 966 
 967 static int goto_next_sequence(const u8 *data, int index, int total)
 968 {
 969         u16 len;
 970 
 971         /* Skip Sequence Byte. */
 972         for (index = index + 1; index < total; index += len) {
 973                 u8 operation_byte = *(data + index);
 974                 index++;
 975 
 976                 switch (operation_byte) {
 977                 case MIPI_SEQ_ELEM_END:
 978                         return index;
 979                 case MIPI_SEQ_ELEM_SEND_PKT:
 980                         if (index + 4 > total)
 981                                 return 0;
 982 
 983                         len = *((const u16 *)(data + index + 2)) + 4;
 984                         break;
 985                 case MIPI_SEQ_ELEM_DELAY:
 986                         len = 4;
 987                         break;
 988                 case MIPI_SEQ_ELEM_GPIO:
 989                         len = 2;
 990                         break;
 991                 case MIPI_SEQ_ELEM_I2C:
 992                         if (index + 7 > total)
 993                                 return 0;
 994                         len = *(data + index + 6) + 7;
 995                         break;
 996                 default:
 997                         DRM_ERROR("Unknown operation byte\n");
 998                         return 0;
 999                 }
1000         }
1001 
1002         return 0;
1003 }
1004 
1005 static int goto_next_sequence_v3(const u8 *data, int index, int total)
1006 {
1007         int seq_end;
1008         u16 len;
1009         u32 size_of_sequence;
1010 
1011         /*
1012          * Could skip sequence based on Size of Sequence alone, but also do some
1013          * checking on the structure.
1014          */
1015         if (total < 5) {
1016                 DRM_ERROR("Too small sequence size\n");
1017                 return 0;
1018         }
1019 
1020         /* Skip Sequence Byte. */
1021         index++;
1022 
1023         /*
1024          * Size of Sequence. Excludes the Sequence Byte and the size itself,
1025          * includes MIPI_SEQ_ELEM_END byte, excludes the final MIPI_SEQ_END
1026          * byte.
1027          */
1028         size_of_sequence = *((const u32 *)(data + index));
1029         index += 4;
1030 
1031         seq_end = index + size_of_sequence;
1032         if (seq_end > total) {
1033                 DRM_ERROR("Invalid sequence size\n");
1034                 return 0;
1035         }
1036 
1037         for (; index < total; index += len) {
1038                 u8 operation_byte = *(data + index);
1039                 index++;
1040 
1041                 if (operation_byte == MIPI_SEQ_ELEM_END) {
1042                         if (index != seq_end) {
1043                                 DRM_ERROR("Invalid element structure\n");
1044                                 return 0;
1045                         }
1046                         return index;
1047                 }
1048 
1049                 len = *(data + index);
1050                 index++;
1051 
1052                 /*
1053                  * FIXME: Would be nice to check elements like for v1/v2 in
1054                  * goto_next_sequence() above.
1055                  */
1056                 switch (operation_byte) {
1057                 case MIPI_SEQ_ELEM_SEND_PKT:
1058                 case MIPI_SEQ_ELEM_DELAY:
1059                 case MIPI_SEQ_ELEM_GPIO:
1060                 case MIPI_SEQ_ELEM_I2C:
1061                 case MIPI_SEQ_ELEM_SPI:
1062                 case MIPI_SEQ_ELEM_PMIC:
1063                         break;
1064                 default:
1065                         DRM_ERROR("Unknown operation byte %u\n",
1066                                   operation_byte);
1067                         break;
1068                 }
1069         }
1070 
1071         return 0;
1072 }
1073 
1074 /*
1075  * Get len of pre-fixed deassert fragment from a v1 init OTP sequence,
1076  * skip all delay + gpio operands and stop at the first DSI packet op.
1077  */
1078 static int get_init_otp_deassert_fragment_len(struct drm_i915_private *dev_priv)
1079 {
1080         const u8 *data = dev_priv->vbt.dsi.sequence[MIPI_SEQ_INIT_OTP];
1081         int index, len;
1082 
1083         if (WARN_ON(!data || dev_priv->vbt.dsi.seq_version != 1))
1084                 return 0;
1085 
1086         /* index = 1 to skip sequence byte */
1087         for (index = 1; data[index] != MIPI_SEQ_ELEM_END; index += len) {
1088                 switch (data[index]) {
1089                 case MIPI_SEQ_ELEM_SEND_PKT:
1090                         return index == 1 ? 0 : index;
1091                 case MIPI_SEQ_ELEM_DELAY:
1092                         len = 5; /* 1 byte for operand + uint32 */
1093                         break;
1094                 case MIPI_SEQ_ELEM_GPIO:
1095                         len = 3; /* 1 byte for op, 1 for gpio_nr, 1 for value */
1096                         break;
1097                 default:
1098                         return 0;
1099                 }
1100         }
1101 
1102         return 0;
1103 }
1104 
1105 /*
1106  * Some v1 VBT MIPI sequences do the deassert in the init OTP sequence.
1107  * The deassert must be done before calling intel_dsi_device_ready, so for
1108  * these devices we split the init OTP sequence into a deassert sequence and
1109  * the actual init OTP part.
1110  */
1111 static void fixup_mipi_sequences(struct drm_i915_private *dev_priv)
1112 {
1113         u8 *init_otp;
1114         int len;
1115 
1116         /* Limit this to VLV for now. */
1117         if (!IS_VALLEYVIEW(dev_priv))
1118                 return;
1119 
1120         /* Limit this to v1 vid-mode sequences */
1121         if (dev_priv->vbt.dsi.config->is_cmd_mode ||
1122             dev_priv->vbt.dsi.seq_version != 1)
1123                 return;
1124 
1125         /* Only do this if there are otp and assert seqs and no deassert seq */
1126         if (!dev_priv->vbt.dsi.sequence[MIPI_SEQ_INIT_OTP] ||
1127             !dev_priv->vbt.dsi.sequence[MIPI_SEQ_ASSERT_RESET] ||
1128             dev_priv->vbt.dsi.sequence[MIPI_SEQ_DEASSERT_RESET])
1129                 return;
1130 
1131         /* The deassert-sequence ends at the first DSI packet */
1132         len = get_init_otp_deassert_fragment_len(dev_priv);
1133         if (!len)
1134                 return;
1135 
1136         DRM_DEBUG_KMS("Using init OTP fragment to deassert reset\n");
1137 
1138         /* Copy the fragment, update seq byte and terminate it */
1139         init_otp = (u8 *)dev_priv->vbt.dsi.sequence[MIPI_SEQ_INIT_OTP];
1140         dev_priv->vbt.dsi.deassert_seq = kmemdup(init_otp, len + 1, GFP_KERNEL);
1141         if (!dev_priv->vbt.dsi.deassert_seq)
1142                 return;
1143         dev_priv->vbt.dsi.deassert_seq[0] = MIPI_SEQ_DEASSERT_RESET;
1144         dev_priv->vbt.dsi.deassert_seq[len] = MIPI_SEQ_ELEM_END;
1145         /* Use the copy for deassert */
1146         dev_priv->vbt.dsi.sequence[MIPI_SEQ_DEASSERT_RESET] =
1147                 dev_priv->vbt.dsi.deassert_seq;
1148         /* Replace the last byte of the fragment with init OTP seq byte */
1149         init_otp[len - 1] = MIPI_SEQ_INIT_OTP;
1150         /* And make MIPI_MIPI_SEQ_INIT_OTP point to it */
1151         dev_priv->vbt.dsi.sequence[MIPI_SEQ_INIT_OTP] = init_otp + len - 1;
1152 }
1153 
1154 static void
1155 parse_mipi_sequence(struct drm_i915_private *dev_priv,
1156                     const struct bdb_header *bdb)
1157 {
1158         int panel_type = dev_priv->vbt.panel_type;
1159         const struct bdb_mipi_sequence *sequence;
1160         const u8 *seq_data;
1161         u32 seq_size;
1162         u8 *data;
1163         int index = 0;
1164 
1165         /* Only our generic panel driver uses the sequence block. */
1166         if (dev_priv->vbt.dsi.panel_id != MIPI_DSI_GENERIC_PANEL_ID)
1167                 return;
1168 
1169         sequence = find_section(bdb, BDB_MIPI_SEQUENCE);
1170         if (!sequence) {
1171                 DRM_DEBUG_KMS("No MIPI Sequence found, parsing complete\n");
1172                 return;
1173         }
1174 
1175         /* Fail gracefully for forward incompatible sequence block. */
1176         if (sequence->version >= 4) {
1177                 DRM_ERROR("Unable to parse MIPI Sequence Block v%u\n",
1178                           sequence->version);
1179                 return;
1180         }
1181 
1182         DRM_DEBUG_DRIVER("Found MIPI sequence block v%u\n", sequence->version);
1183 
1184         seq_data = find_panel_sequence_block(sequence, panel_type, &seq_size);
1185         if (!seq_data)
1186                 return;
1187 
1188         data = kmemdup(seq_data, seq_size, GFP_KERNEL);
1189         if (!data)
1190                 return;
1191 
1192         /* Parse the sequences, store pointers to each sequence. */
1193         for (;;) {
1194                 u8 seq_id = *(data + index);
1195                 if (seq_id == MIPI_SEQ_END)
1196                         break;
1197 
1198                 if (seq_id >= MIPI_SEQ_MAX) {
1199                         DRM_ERROR("Unknown sequence %u\n", seq_id);
1200                         goto err;
1201                 }
1202 
1203                 /* Log about presence of sequences we won't run. */
1204                 if (seq_id == MIPI_SEQ_TEAR_ON || seq_id == MIPI_SEQ_TEAR_OFF)
1205                         DRM_DEBUG_KMS("Unsupported sequence %u\n", seq_id);
1206 
1207                 dev_priv->vbt.dsi.sequence[seq_id] = data + index;
1208 
1209                 if (sequence->version >= 3)
1210                         index = goto_next_sequence_v3(data, index, seq_size);
1211                 else
1212                         index = goto_next_sequence(data, index, seq_size);
1213                 if (!index) {
1214                         DRM_ERROR("Invalid sequence %u\n", seq_id);
1215                         goto err;
1216                 }
1217         }
1218 
1219         dev_priv->vbt.dsi.data = data;
1220         dev_priv->vbt.dsi.size = seq_size;
1221         dev_priv->vbt.dsi.seq_version = sequence->version;
1222 
1223         fixup_mipi_sequences(dev_priv);
1224 
1225         DRM_DEBUG_DRIVER("MIPI related VBT parsing complete\n");
1226         return;
1227 
1228 err:
1229         kfree(data);
1230         memset(dev_priv->vbt.dsi.sequence, 0, sizeof(dev_priv->vbt.dsi.sequence));
1231 }
1232 
1233 static u8 translate_iboost(u8 val)
1234 {
1235         static const u8 mapping[] = { 1, 3, 7 }; /* See VBT spec */
1236 
1237         if (val >= ARRAY_SIZE(mapping)) {
1238                 DRM_DEBUG_KMS("Unsupported I_boost value found in VBT (%d), display may not work properly\n", val);
1239                 return 0;
1240         }
1241         return mapping[val];
1242 }
1243 
1244 static enum port get_port_by_ddc_pin(struct drm_i915_private *i915, u8 ddc_pin)
1245 {
1246         const struct ddi_vbt_port_info *info;
1247         enum port port;
1248 
1249         for (port = PORT_A; port < I915_MAX_PORTS; port++) {
1250                 info = &i915->vbt.ddi_port_info[port];
1251 
1252                 if (info->child && ddc_pin == info->alternate_ddc_pin)
1253                         return port;
1254         }
1255 
1256         return PORT_NONE;
1257 }
1258 
1259 static void sanitize_ddc_pin(struct drm_i915_private *dev_priv,
1260                              enum port port)
1261 {
1262         struct ddi_vbt_port_info *info = &dev_priv->vbt.ddi_port_info[port];
1263         enum port p;
1264 
1265         if (!info->alternate_ddc_pin)
1266                 return;
1267 
1268         p = get_port_by_ddc_pin(dev_priv, info->alternate_ddc_pin);
1269         if (p != PORT_NONE) {
1270                 DRM_DEBUG_KMS("port %c trying to use the same DDC pin (0x%x) as port %c, "
1271                               "disabling port %c DVI/HDMI support\n",
1272                               port_name(port), info->alternate_ddc_pin,
1273                               port_name(p), port_name(p));
1274 
1275                 /*
1276                  * If we have multiple ports supposedly sharing the
1277                  * pin, then dvi/hdmi couldn't exist on the shared
1278                  * port. Otherwise they share the same ddc bin and
1279                  * system couldn't communicate with them separately.
1280                  *
1281                  * Give inverse child device order the priority,
1282                  * last one wins. Yes, there are real machines
1283                  * (eg. Asrock B250M-HDV) where VBT has both
1284                  * port A and port E with the same AUX ch and
1285                  * we must pick port E :(
1286                  */
1287                 info = &dev_priv->vbt.ddi_port_info[p];
1288 
1289                 info->supports_dvi = false;
1290                 info->supports_hdmi = false;
1291                 info->alternate_ddc_pin = 0;
1292         }
1293 }
1294 
1295 static enum port get_port_by_aux_ch(struct drm_i915_private *i915, u8 aux_ch)
1296 {
1297         const struct ddi_vbt_port_info *info;
1298         enum port port;
1299 
1300         for (port = PORT_A; port < I915_MAX_PORTS; port++) {
1301                 info = &i915->vbt.ddi_port_info[port];
1302 
1303                 if (info->child && aux_ch == info->alternate_aux_channel)
1304                         return port;
1305         }
1306 
1307         return PORT_NONE;
1308 }
1309 
1310 static void sanitize_aux_ch(struct drm_i915_private *dev_priv,
1311                             enum port port)
1312 {
1313         struct ddi_vbt_port_info *info = &dev_priv->vbt.ddi_port_info[port];
1314         enum port p;
1315 
1316         if (!info->alternate_aux_channel)
1317                 return;
1318 
1319         p = get_port_by_aux_ch(dev_priv, info->alternate_aux_channel);
1320         if (p != PORT_NONE) {
1321                 DRM_DEBUG_KMS("port %c trying to use the same AUX CH (0x%x) as port %c, "
1322                               "disabling port %c DP support\n",
1323                               port_name(port), info->alternate_aux_channel,
1324                               port_name(p), port_name(p));
1325 
1326                 /*
1327                  * If we have multiple ports supposedlt sharing the
1328                  * aux channel, then DP couldn't exist on the shared
1329                  * port. Otherwise they share the same aux channel
1330                  * and system couldn't communicate with them separately.
1331                  *
1332                  * Give inverse child device order the priority,
1333                  * last one wins. Yes, there are real machines
1334                  * (eg. Asrock B250M-HDV) where VBT has both
1335                  * port A and port E with the same AUX ch and
1336                  * we must pick port E :(
1337                  */
1338                 info = &dev_priv->vbt.ddi_port_info[p];
1339 
1340                 info->supports_dp = false;
1341                 info->alternate_aux_channel = 0;
1342         }
1343 }
1344 
1345 static const u8 cnp_ddc_pin_map[] = {
1346         [0] = 0, /* N/A */
1347         [DDC_BUS_DDI_B] = GMBUS_PIN_1_BXT,
1348         [DDC_BUS_DDI_C] = GMBUS_PIN_2_BXT,
1349         [DDC_BUS_DDI_D] = GMBUS_PIN_4_CNP, /* sic */
1350         [DDC_BUS_DDI_F] = GMBUS_PIN_3_BXT, /* sic */
1351 };
1352 
1353 static const u8 icp_ddc_pin_map[] = {
1354         [ICL_DDC_BUS_DDI_A] = GMBUS_PIN_1_BXT,
1355         [ICL_DDC_BUS_DDI_B] = GMBUS_PIN_2_BXT,
1356         [TGL_DDC_BUS_DDI_C] = GMBUS_PIN_3_BXT,
1357         [ICL_DDC_BUS_PORT_1] = GMBUS_PIN_9_TC1_ICP,
1358         [ICL_DDC_BUS_PORT_2] = GMBUS_PIN_10_TC2_ICP,
1359         [ICL_DDC_BUS_PORT_3] = GMBUS_PIN_11_TC3_ICP,
1360         [ICL_DDC_BUS_PORT_4] = GMBUS_PIN_12_TC4_ICP,
1361         [TGL_DDC_BUS_PORT_5] = GMBUS_PIN_13_TC5_TGP,
1362         [TGL_DDC_BUS_PORT_6] = GMBUS_PIN_14_TC6_TGP,
1363 };
1364 
1365 static u8 map_ddc_pin(struct drm_i915_private *dev_priv, u8 vbt_pin)
1366 {
1367         const u8 *ddc_pin_map;
1368         int n_entries;
1369 
1370         if (INTEL_PCH_TYPE(dev_priv) >= PCH_ICP) {
1371                 ddc_pin_map = icp_ddc_pin_map;
1372                 n_entries = ARRAY_SIZE(icp_ddc_pin_map);
1373         } else if (HAS_PCH_CNP(dev_priv)) {
1374                 ddc_pin_map = cnp_ddc_pin_map;
1375                 n_entries = ARRAY_SIZE(cnp_ddc_pin_map);
1376         } else {
1377                 /* Assuming direct map */
1378                 return vbt_pin;
1379         }
1380 
1381         if (vbt_pin < n_entries && ddc_pin_map[vbt_pin] != 0)
1382                 return ddc_pin_map[vbt_pin];
1383 
1384         DRM_DEBUG_KMS("Ignoring alternate pin: VBT claims DDC pin %d, which is not valid for this platform\n",
1385                       vbt_pin);
1386         return 0;
1387 }
1388 
1389 static enum port dvo_port_to_port(u8 dvo_port)
1390 {
1391         /*
1392          * Each DDI port can have more than one value on the "DVO Port" field,
1393          * so look for all the possible values for each port.
1394          */
1395         static const int dvo_ports[][3] = {
1396                 [PORT_A] = { DVO_PORT_HDMIA, DVO_PORT_DPA, -1},
1397                 [PORT_B] = { DVO_PORT_HDMIB, DVO_PORT_DPB, -1},
1398                 [PORT_C] = { DVO_PORT_HDMIC, DVO_PORT_DPC, -1},
1399                 [PORT_D] = { DVO_PORT_HDMID, DVO_PORT_DPD, -1},
1400                 [PORT_E] = { DVO_PORT_CRT, DVO_PORT_HDMIE, DVO_PORT_DPE},
1401                 [PORT_F] = { DVO_PORT_HDMIF, DVO_PORT_DPF, -1},
1402         };
1403         enum port port;
1404         int i;
1405 
1406         for (port = PORT_A; port < ARRAY_SIZE(dvo_ports); port++) {
1407                 for (i = 0; i < ARRAY_SIZE(dvo_ports[port]); i++) {
1408                         if (dvo_ports[port][i] == -1)
1409                                 break;
1410 
1411                         if (dvo_port == dvo_ports[port][i])
1412                                 return port;
1413                 }
1414         }
1415 
1416         return PORT_NONE;
1417 }
1418 
1419 static void parse_ddi_port(struct drm_i915_private *dev_priv,
1420                            const struct child_device_config *child,
1421                            u8 bdb_version)
1422 {
1423         struct ddi_vbt_port_info *info;
1424         bool is_dvi, is_hdmi, is_dp, is_edp, is_crt;
1425         enum port port;
1426 
1427         port = dvo_port_to_port(child->dvo_port);
1428         if (port == PORT_NONE)
1429                 return;
1430 
1431         info = &dev_priv->vbt.ddi_port_info[port];
1432 
1433         if (info->child) {
1434                 DRM_DEBUG_KMS("More than one child device for port %c in VBT, using the first.\n",
1435                               port_name(port));
1436                 return;
1437         }
1438 
1439         is_dvi = child->device_type & DEVICE_TYPE_TMDS_DVI_SIGNALING;
1440         is_dp = child->device_type & DEVICE_TYPE_DISPLAYPORT_OUTPUT;
1441         is_crt = child->device_type & DEVICE_TYPE_ANALOG_OUTPUT;
1442         is_hdmi = is_dvi && (child->device_type & DEVICE_TYPE_NOT_HDMI_OUTPUT) == 0;
1443         is_edp = is_dp && (child->device_type & DEVICE_TYPE_INTERNAL_CONNECTOR);
1444 
1445         if (port == PORT_A && is_dvi) {
1446                 DRM_DEBUG_KMS("VBT claims port A supports DVI%s, ignoring\n",
1447                               is_hdmi ? "/HDMI" : "");
1448                 is_dvi = false;
1449                 is_hdmi = false;
1450         }
1451 
1452         info->supports_dvi = is_dvi;
1453         info->supports_hdmi = is_hdmi;
1454         info->supports_dp = is_dp;
1455         info->supports_edp = is_edp;
1456 
1457         if (bdb_version >= 195)
1458                 info->supports_typec_usb = child->dp_usb_type_c;
1459 
1460         if (bdb_version >= 209)
1461                 info->supports_tbt = child->tbt;
1462 
1463         DRM_DEBUG_KMS("Port %c VBT info: CRT:%d DVI:%d HDMI:%d DP:%d eDP:%d LSPCON:%d USB-Type-C:%d TBT:%d\n",
1464                       port_name(port), is_crt, is_dvi, is_hdmi, is_dp, is_edp,
1465                       HAS_LSPCON(dev_priv) && child->lspcon,
1466                       info->supports_typec_usb, info->supports_tbt);
1467 
1468         if (is_edp && is_dvi)
1469                 DRM_DEBUG_KMS("Internal DP port %c is TMDS compatible\n",
1470                               port_name(port));
1471         if (is_crt && port != PORT_E)
1472                 DRM_DEBUG_KMS("Port %c is analog\n", port_name(port));
1473         if (is_crt && (is_dvi || is_dp))
1474                 DRM_DEBUG_KMS("Analog port %c is also DP or TMDS compatible\n",
1475                               port_name(port));
1476         if (is_dvi && (port == PORT_A || port == PORT_E))
1477                 DRM_DEBUG_KMS("Port %c is TMDS compatible\n", port_name(port));
1478         if (!is_dvi && !is_dp && !is_crt)
1479                 DRM_DEBUG_KMS("Port %c is not DP/TMDS/CRT compatible\n",
1480                               port_name(port));
1481         if (is_edp && (port == PORT_B || port == PORT_C || port == PORT_E))
1482                 DRM_DEBUG_KMS("Port %c is internal DP\n", port_name(port));
1483 
1484         if (is_dvi) {
1485                 u8 ddc_pin;
1486 
1487                 ddc_pin = map_ddc_pin(dev_priv, child->ddc_pin);
1488                 if (intel_gmbus_is_valid_pin(dev_priv, ddc_pin)) {
1489                         info->alternate_ddc_pin = ddc_pin;
1490                         sanitize_ddc_pin(dev_priv, port);
1491                 } else {
1492                         DRM_DEBUG_KMS("Port %c has invalid DDC pin %d, "
1493                                       "sticking to defaults\n",
1494                                       port_name(port), ddc_pin);
1495                 }
1496         }
1497 
1498         if (is_dp) {
1499                 info->alternate_aux_channel = child->aux_channel;
1500 
1501                 sanitize_aux_ch(dev_priv, port);
1502         }
1503 
1504         if (bdb_version >= 158) {
1505                 /* The VBT HDMI level shift values match the table we have. */
1506                 u8 hdmi_level_shift = child->hdmi_level_shifter_value;
1507                 DRM_DEBUG_KMS("VBT HDMI level shift for port %c: %d\n",
1508                               port_name(port),
1509                               hdmi_level_shift);
1510                 info->hdmi_level_shift = hdmi_level_shift;
1511         }
1512 
1513         if (bdb_version >= 204) {
1514                 int max_tmds_clock;
1515 
1516                 switch (child->hdmi_max_data_rate) {
1517                 default:
1518                         MISSING_CASE(child->hdmi_max_data_rate);
1519                         /* fall through */
1520                 case HDMI_MAX_DATA_RATE_PLATFORM:
1521                         max_tmds_clock = 0;
1522                         break;
1523                 case HDMI_MAX_DATA_RATE_297:
1524                         max_tmds_clock = 297000;
1525                         break;
1526                 case HDMI_MAX_DATA_RATE_165:
1527                         max_tmds_clock = 165000;
1528                         break;
1529                 }
1530 
1531                 if (max_tmds_clock)
1532                         DRM_DEBUG_KMS("VBT HDMI max TMDS clock for port %c: %d kHz\n",
1533                                       port_name(port), max_tmds_clock);
1534                 info->max_tmds_clock = max_tmds_clock;
1535         }
1536 
1537         /* Parse the I_boost config for SKL and above */
1538         if (bdb_version >= 196 && child->iboost) {
1539                 info->dp_boost_level = translate_iboost(child->dp_iboost_level);
1540                 DRM_DEBUG_KMS("VBT (e)DP boost level for port %c: %d\n",
1541                               port_name(port), info->dp_boost_level);
1542                 info->hdmi_boost_level = translate_iboost(child->hdmi_iboost_level);
1543                 DRM_DEBUG_KMS("VBT HDMI boost level for port %c: %d\n",
1544                               port_name(port), info->hdmi_boost_level);
1545         }
1546 
1547         /* DP max link rate for CNL+ */
1548         if (bdb_version >= 216) {
1549                 switch (child->dp_max_link_rate) {
1550                 default:
1551                 case VBT_DP_MAX_LINK_RATE_HBR3:
1552                         info->dp_max_link_rate = 810000;
1553                         break;
1554                 case VBT_DP_MAX_LINK_RATE_HBR2:
1555                         info->dp_max_link_rate = 540000;
1556                         break;
1557                 case VBT_DP_MAX_LINK_RATE_HBR:
1558                         info->dp_max_link_rate = 270000;
1559                         break;
1560                 case VBT_DP_MAX_LINK_RATE_LBR:
1561                         info->dp_max_link_rate = 162000;
1562                         break;
1563                 }
1564                 DRM_DEBUG_KMS("VBT DP max link rate for port %c: %d\n",
1565                               port_name(port), info->dp_max_link_rate);
1566         }
1567 
1568         info->child = child;
1569 }
1570 
1571 static void parse_ddi_ports(struct drm_i915_private *dev_priv, u8 bdb_version)
1572 {
1573         const struct child_device_config *child;
1574         int i;
1575 
1576         if (!HAS_DDI(dev_priv) && !IS_CHERRYVIEW(dev_priv))
1577                 return;
1578 
1579         if (bdb_version < 155)
1580                 return;
1581 
1582         for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
1583                 child = dev_priv->vbt.child_dev + i;
1584 
1585                 parse_ddi_port(dev_priv, child, bdb_version);
1586         }
1587 }
1588 
1589 static void
1590 parse_general_definitions(struct drm_i915_private *dev_priv,
1591                           const struct bdb_header *bdb)
1592 {
1593         const struct bdb_general_definitions *defs;
1594         const struct child_device_config *child;
1595         int i, child_device_num, count;
1596         u8 expected_size;
1597         u16 block_size;
1598         int bus_pin;
1599 
1600         defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
1601         if (!defs) {
1602                 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
1603                 return;
1604         }
1605 
1606         block_size = get_blocksize(defs);
1607         if (block_size < sizeof(*defs)) {
1608                 DRM_DEBUG_KMS("General definitions block too small (%u)\n",
1609                               block_size);
1610                 return;
1611         }
1612 
1613         bus_pin = defs->crt_ddc_gmbus_pin;
1614         DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
1615         if (intel_gmbus_is_valid_pin(dev_priv, bus_pin))
1616                 dev_priv->vbt.crt_ddc_pin = bus_pin;
1617 
1618         if (bdb->version < 106) {
1619                 expected_size = 22;
1620         } else if (bdb->version < 111) {
1621                 expected_size = 27;
1622         } else if (bdb->version < 195) {
1623                 expected_size = LEGACY_CHILD_DEVICE_CONFIG_SIZE;
1624         } else if (bdb->version == 195) {
1625                 expected_size = 37;
1626         } else if (bdb->version <= 215) {
1627                 expected_size = 38;
1628         } else if (bdb->version <= 216) {
1629                 expected_size = 39;
1630         } else {
1631                 expected_size = sizeof(*child);
1632                 BUILD_BUG_ON(sizeof(*child) < 39);
1633                 DRM_DEBUG_DRIVER("Expected child device config size for VBT version %u not known; assuming %u\n",
1634                                  bdb->version, expected_size);
1635         }
1636 
1637         /* Flag an error for unexpected size, but continue anyway. */
1638         if (defs->child_dev_size != expected_size)
1639                 DRM_ERROR("Unexpected child device config size %u (expected %u for VBT version %u)\n",
1640                           defs->child_dev_size, expected_size, bdb->version);
1641 
1642         /* The legacy sized child device config is the minimum we need. */
1643         if (defs->child_dev_size < LEGACY_CHILD_DEVICE_CONFIG_SIZE) {
1644                 DRM_DEBUG_KMS("Child device config size %u is too small.\n",
1645                               defs->child_dev_size);
1646                 return;
1647         }
1648 
1649         /* get the number of child device */
1650         child_device_num = (block_size - sizeof(*defs)) / defs->child_dev_size;
1651         count = 0;
1652         /* get the number of child device that is present */
1653         for (i = 0; i < child_device_num; i++) {
1654                 child = child_device_ptr(defs, i);
1655                 if (!child->device_type)
1656                         continue;
1657                 count++;
1658         }
1659         if (!count) {
1660                 DRM_DEBUG_KMS("no child dev is parsed from VBT\n");
1661                 return;
1662         }
1663         dev_priv->vbt.child_dev = kcalloc(count, sizeof(*child), GFP_KERNEL);
1664         if (!dev_priv->vbt.child_dev) {
1665                 DRM_DEBUG_KMS("No memory space for child device\n");
1666                 return;
1667         }
1668 
1669         dev_priv->vbt.child_dev_num = count;
1670         count = 0;
1671         for (i = 0; i < child_device_num; i++) {
1672                 child = child_device_ptr(defs, i);
1673                 if (!child->device_type)
1674                         continue;
1675 
1676                 DRM_DEBUG_KMS("Found VBT child device with type 0x%x\n",
1677                               child->device_type);
1678 
1679                 /*
1680                  * Copy as much as we know (sizeof) and is available
1681                  * (child_dev_size) of the child device. Accessing the data must
1682                  * depend on VBT version.
1683                  */
1684                 memcpy(dev_priv->vbt.child_dev + count, child,
1685                        min_t(size_t, defs->child_dev_size, sizeof(*child)));
1686                 count++;
1687         }
1688 }
1689 
1690 /* Common defaults which may be overridden by VBT. */
1691 static void
1692 init_vbt_defaults(struct drm_i915_private *dev_priv)
1693 {
1694         enum port port;
1695 
1696         dev_priv->vbt.crt_ddc_pin = GMBUS_PIN_VGADDC;
1697 
1698         /* Default to having backlight */
1699         dev_priv->vbt.backlight.present = true;
1700 
1701         /* LFP panel data */
1702         dev_priv->vbt.lvds_dither = 1;
1703 
1704         /* SDVO panel data */
1705         dev_priv->vbt.sdvo_lvds_vbt_mode = NULL;
1706 
1707         /* general features */
1708         dev_priv->vbt.int_tv_support = 1;
1709         dev_priv->vbt.int_crt_support = 1;
1710 
1711         /* driver features */
1712         dev_priv->vbt.int_lvds_support = 1;
1713 
1714         /* Default to using SSC */
1715         dev_priv->vbt.lvds_use_ssc = 1;
1716         /*
1717          * Core/SandyBridge/IvyBridge use alternative (120MHz) reference
1718          * clock for LVDS.
1719          */
1720         dev_priv->vbt.lvds_ssc_freq = intel_bios_ssc_frequency(dev_priv,
1721                         !HAS_PCH_SPLIT(dev_priv));
1722         DRM_DEBUG_KMS("Set default to SSC at %d kHz\n", dev_priv->vbt.lvds_ssc_freq);
1723 
1724         for (port = PORT_A; port < I915_MAX_PORTS; port++) {
1725                 struct ddi_vbt_port_info *info =
1726                         &dev_priv->vbt.ddi_port_info[port];
1727 
1728                 info->hdmi_level_shift = HDMI_LEVEL_SHIFT_UNKNOWN;
1729         }
1730 }
1731 
1732 /* Defaults to initialize only if there is no VBT. */
1733 static void
1734 init_vbt_missing_defaults(struct drm_i915_private *dev_priv)
1735 {
1736         enum port port;
1737 
1738         for (port = PORT_A; port < I915_MAX_PORTS; port++) {
1739                 struct ddi_vbt_port_info *info =
1740                         &dev_priv->vbt.ddi_port_info[port];
1741                 enum phy phy = intel_port_to_phy(dev_priv, port);
1742 
1743                 /*
1744                  * VBT has the TypeC mode (native,TBT/USB) and we don't want
1745                  * to detect it.
1746                  */
1747                 if (intel_phy_is_tc(dev_priv, phy))
1748                         continue;
1749 
1750                 info->supports_dvi = (port != PORT_A && port != PORT_E);
1751                 info->supports_hdmi = info->supports_dvi;
1752                 info->supports_dp = (port != PORT_E);
1753                 info->supports_edp = (port == PORT_A);
1754         }
1755 }
1756 
1757 static const struct bdb_header *get_bdb_header(const struct vbt_header *vbt)
1758 {
1759         const void *_vbt = vbt;
1760 
1761         return _vbt + vbt->bdb_offset;
1762 }
1763 
1764 /**
1765  * intel_bios_is_valid_vbt - does the given buffer contain a valid VBT
1766  * @buf:        pointer to a buffer to validate
1767  * @size:       size of the buffer
1768  *
1769  * Returns true on valid VBT.
1770  */
1771 bool intel_bios_is_valid_vbt(const void *buf, size_t size)
1772 {
1773         const struct vbt_header *vbt = buf;
1774         const struct bdb_header *bdb;
1775 
1776         if (!vbt)
1777                 return false;
1778 
1779         if (sizeof(struct vbt_header) > size) {
1780                 DRM_DEBUG_DRIVER("VBT header incomplete\n");
1781                 return false;
1782         }
1783 
1784         if (memcmp(vbt->signature, "$VBT", 4)) {
1785                 DRM_DEBUG_DRIVER("VBT invalid signature\n");
1786                 return false;
1787         }
1788 
1789         if (range_overflows_t(size_t,
1790                               vbt->bdb_offset,
1791                               sizeof(struct bdb_header),
1792                               size)) {
1793                 DRM_DEBUG_DRIVER("BDB header incomplete\n");
1794                 return false;
1795         }
1796 
1797         bdb = get_bdb_header(vbt);
1798         if (range_overflows_t(size_t, vbt->bdb_offset, bdb->bdb_size, size)) {
1799                 DRM_DEBUG_DRIVER("BDB incomplete\n");
1800                 return false;
1801         }
1802 
1803         return vbt;
1804 }
1805 
1806 static const struct vbt_header *find_vbt(void __iomem *bios, size_t size)
1807 {
1808         size_t i;
1809 
1810         /* Scour memory looking for the VBT signature. */
1811         for (i = 0; i + 4 < size; i++) {
1812                 void *vbt;
1813 
1814                 if (ioread32(bios + i) != *((const u32 *) "$VBT"))
1815                         continue;
1816 
1817                 /*
1818                  * This is the one place where we explicitly discard the address
1819                  * space (__iomem) of the BIOS/VBT.
1820                  */
1821                 vbt = (void __force *) bios + i;
1822                 if (intel_bios_is_valid_vbt(vbt, size - i))
1823                         return vbt;
1824 
1825                 break;
1826         }
1827 
1828         return NULL;
1829 }
1830 
1831 /**
1832  * intel_bios_init - find VBT and initialize settings from the BIOS
1833  * @dev_priv: i915 device instance
1834  *
1835  * Parse and initialize settings from the Video BIOS Tables (VBT). If the VBT
1836  * was not found in ACPI OpRegion, try to find it in PCI ROM first. Also
1837  * initialize some defaults if the VBT is not present at all.
1838  */
1839 void intel_bios_init(struct drm_i915_private *dev_priv)
1840 {
1841         struct pci_dev *pdev = dev_priv->drm.pdev;
1842         const struct vbt_header *vbt = dev_priv->opregion.vbt;
1843         const struct bdb_header *bdb;
1844         u8 __iomem *bios = NULL;
1845 
1846         if (!HAS_DISPLAY(dev_priv)) {
1847                 DRM_DEBUG_KMS("Skipping VBT init due to disabled display.\n");
1848                 return;
1849         }
1850 
1851         init_vbt_defaults(dev_priv);
1852 
1853         /* If the OpRegion does not have VBT, look in PCI ROM. */
1854         if (!vbt) {
1855                 size_t size;
1856 
1857                 bios = pci_map_rom(pdev, &size);
1858                 if (!bios)
1859                         goto out;
1860 
1861                 vbt = find_vbt(bios, size);
1862                 if (!vbt)
1863                         goto out;
1864 
1865                 DRM_DEBUG_KMS("Found valid VBT in PCI ROM\n");
1866         }
1867 
1868         bdb = get_bdb_header(vbt);
1869 
1870         DRM_DEBUG_KMS("VBT signature \"%.*s\", BDB version %d\n",
1871                       (int)sizeof(vbt->signature), vbt->signature, bdb->version);
1872 
1873         /* Grab useful general definitions */
1874         parse_general_features(dev_priv, bdb);
1875         parse_general_definitions(dev_priv, bdb);
1876         parse_lfp_panel_data(dev_priv, bdb);
1877         parse_lfp_backlight(dev_priv, bdb);
1878         parse_sdvo_panel_data(dev_priv, bdb);
1879         parse_driver_features(dev_priv, bdb);
1880         parse_edp(dev_priv, bdb);
1881         parse_psr(dev_priv, bdb);
1882         parse_mipi_config(dev_priv, bdb);
1883         parse_mipi_sequence(dev_priv, bdb);
1884 
1885         /* Further processing on pre-parsed data */
1886         parse_sdvo_device_mapping(dev_priv, bdb->version);
1887         parse_ddi_ports(dev_priv, bdb->version);
1888 
1889 out:
1890         if (!vbt) {
1891                 DRM_INFO("Failed to find VBIOS tables (VBT)\n");
1892                 init_vbt_missing_defaults(dev_priv);
1893         }
1894 
1895         if (bios)
1896                 pci_unmap_rom(pdev, bios);
1897 }
1898 
1899 /**
1900  * intel_bios_driver_remove - Free any resources allocated by intel_bios_init()
1901  * @dev_priv: i915 device instance
1902  */
1903 void intel_bios_driver_remove(struct drm_i915_private *dev_priv)
1904 {
1905         kfree(dev_priv->vbt.child_dev);
1906         dev_priv->vbt.child_dev = NULL;
1907         dev_priv->vbt.child_dev_num = 0;
1908         kfree(dev_priv->vbt.sdvo_lvds_vbt_mode);
1909         dev_priv->vbt.sdvo_lvds_vbt_mode = NULL;
1910         kfree(dev_priv->vbt.lfp_lvds_vbt_mode);
1911         dev_priv->vbt.lfp_lvds_vbt_mode = NULL;
1912         kfree(dev_priv->vbt.dsi.data);
1913         dev_priv->vbt.dsi.data = NULL;
1914         kfree(dev_priv->vbt.dsi.pps);
1915         dev_priv->vbt.dsi.pps = NULL;
1916         kfree(dev_priv->vbt.dsi.config);
1917         dev_priv->vbt.dsi.config = NULL;
1918         kfree(dev_priv->vbt.dsi.deassert_seq);
1919         dev_priv->vbt.dsi.deassert_seq = NULL;
1920 }
1921 
1922 /**
1923  * intel_bios_is_tv_present - is integrated TV present in VBT
1924  * @dev_priv:   i915 device instance
1925  *
1926  * Return true if TV is present. If no child devices were parsed from VBT,
1927  * assume TV is present.
1928  */
1929 bool intel_bios_is_tv_present(struct drm_i915_private *dev_priv)
1930 {
1931         const struct child_device_config *child;
1932         int i;
1933 
1934         if (!dev_priv->vbt.int_tv_support)
1935                 return false;
1936 
1937         if (!dev_priv->vbt.child_dev_num)
1938                 return true;
1939 
1940         for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
1941                 child = dev_priv->vbt.child_dev + i;
1942                 /*
1943                  * If the device type is not TV, continue.
1944                  */
1945                 switch (child->device_type) {
1946                 case DEVICE_TYPE_INT_TV:
1947                 case DEVICE_TYPE_TV:
1948                 case DEVICE_TYPE_TV_SVIDEO_COMPOSITE:
1949                         break;
1950                 default:
1951                         continue;
1952                 }
1953                 /* Only when the addin_offset is non-zero, it is regarded
1954                  * as present.
1955                  */
1956                 if (child->addin_offset)
1957                         return true;
1958         }
1959 
1960         return false;
1961 }
1962 
1963 /**
1964  * intel_bios_is_lvds_present - is LVDS present in VBT
1965  * @dev_priv:   i915 device instance
1966  * @i2c_pin:    i2c pin for LVDS if present
1967  *
1968  * Return true if LVDS is present. If no child devices were parsed from VBT,
1969  * assume LVDS is present.
1970  */
1971 bool intel_bios_is_lvds_present(struct drm_i915_private *dev_priv, u8 *i2c_pin)
1972 {
1973         const struct child_device_config *child;
1974         int i;
1975 
1976         if (!dev_priv->vbt.child_dev_num)
1977                 return true;
1978 
1979         for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
1980                 child = dev_priv->vbt.child_dev + i;
1981 
1982                 /* If the device type is not LFP, continue.
1983                  * We have to check both the new identifiers as well as the
1984                  * old for compatibility with some BIOSes.
1985                  */
1986                 if (child->device_type != DEVICE_TYPE_INT_LFP &&
1987                     child->device_type != DEVICE_TYPE_LFP)
1988                         continue;
1989 
1990                 if (intel_gmbus_is_valid_pin(dev_priv, child->i2c_pin))
1991                         *i2c_pin = child->i2c_pin;
1992 
1993                 /* However, we cannot trust the BIOS writers to populate
1994                  * the VBT correctly.  Since LVDS requires additional
1995                  * information from AIM blocks, a non-zero addin offset is
1996                  * a good indicator that the LVDS is actually present.
1997                  */
1998                 if (child->addin_offset)
1999                         return true;
2000 
2001                 /* But even then some BIOS writers perform some black magic
2002                  * and instantiate the device without reference to any
2003                  * additional data.  Trust that if the VBT was written into
2004                  * the OpRegion then they have validated the LVDS's existence.
2005                  */
2006                 if (dev_priv->opregion.vbt)
2007                         return true;
2008         }
2009 
2010         return false;
2011 }
2012 
2013 /**
2014  * intel_bios_is_port_present - is the specified digital port present
2015  * @dev_priv:   i915 device instance
2016  * @port:       port to check
2017  *
2018  * Return true if the device in %port is present.
2019  */
2020 bool intel_bios_is_port_present(struct drm_i915_private *dev_priv, enum port port)
2021 {
2022         const struct child_device_config *child;
2023         static const struct {
2024                 u16 dp, hdmi;
2025         } port_mapping[] = {
2026                 [PORT_B] = { DVO_PORT_DPB, DVO_PORT_HDMIB, },
2027                 [PORT_C] = { DVO_PORT_DPC, DVO_PORT_HDMIC, },
2028                 [PORT_D] = { DVO_PORT_DPD, DVO_PORT_HDMID, },
2029                 [PORT_E] = { DVO_PORT_DPE, DVO_PORT_HDMIE, },
2030                 [PORT_F] = { DVO_PORT_DPF, DVO_PORT_HDMIF, },
2031         };
2032         int i;
2033 
2034         if (HAS_DDI(dev_priv)) {
2035                 const struct ddi_vbt_port_info *port_info =
2036                         &dev_priv->vbt.ddi_port_info[port];
2037 
2038                 return port_info->supports_dp ||
2039                        port_info->supports_dvi ||
2040                        port_info->supports_hdmi;
2041         }
2042 
2043         /* FIXME maybe deal with port A as well? */
2044         if (WARN_ON(port == PORT_A) || port >= ARRAY_SIZE(port_mapping))
2045                 return false;
2046 
2047         if (!dev_priv->vbt.child_dev_num)
2048                 return false;
2049 
2050         for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
2051                 child = dev_priv->vbt.child_dev + i;
2052 
2053                 if ((child->dvo_port == port_mapping[port].dp ||
2054                      child->dvo_port == port_mapping[port].hdmi) &&
2055                     (child->device_type & (DEVICE_TYPE_TMDS_DVI_SIGNALING |
2056                                            DEVICE_TYPE_DISPLAYPORT_OUTPUT)))
2057                         return true;
2058         }
2059 
2060         return false;
2061 }
2062 
2063 /**
2064  * intel_bios_is_port_edp - is the device in given port eDP
2065  * @dev_priv:   i915 device instance
2066  * @port:       port to check
2067  *
2068  * Return true if the device in %port is eDP.
2069  */
2070 bool intel_bios_is_port_edp(struct drm_i915_private *dev_priv, enum port port)
2071 {
2072         const struct child_device_config *child;
2073         static const short port_mapping[] = {
2074                 [PORT_B] = DVO_PORT_DPB,
2075                 [PORT_C] = DVO_PORT_DPC,
2076                 [PORT_D] = DVO_PORT_DPD,
2077                 [PORT_E] = DVO_PORT_DPE,
2078                 [PORT_F] = DVO_PORT_DPF,
2079         };
2080         int i;
2081 
2082         if (HAS_DDI(dev_priv))
2083                 return dev_priv->vbt.ddi_port_info[port].supports_edp;
2084 
2085         if (!dev_priv->vbt.child_dev_num)
2086                 return false;
2087 
2088         for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
2089                 child = dev_priv->vbt.child_dev + i;
2090 
2091                 if (child->dvo_port == port_mapping[port] &&
2092                     (child->device_type & DEVICE_TYPE_eDP_BITS) ==
2093                     (DEVICE_TYPE_eDP & DEVICE_TYPE_eDP_BITS))
2094                         return true;
2095         }
2096 
2097         return false;
2098 }
2099 
2100 static bool child_dev_is_dp_dual_mode(const struct child_device_config *child,
2101                                       enum port port)
2102 {
2103         static const struct {
2104                 u16 dp, hdmi;
2105         } port_mapping[] = {
2106                 /*
2107                  * Buggy VBTs may declare DP ports as having
2108                  * HDMI type dvo_port :( So let's check both.
2109                  */
2110                 [PORT_B] = { DVO_PORT_DPB, DVO_PORT_HDMIB, },
2111                 [PORT_C] = { DVO_PORT_DPC, DVO_PORT_HDMIC, },
2112                 [PORT_D] = { DVO_PORT_DPD, DVO_PORT_HDMID, },
2113                 [PORT_E] = { DVO_PORT_DPE, DVO_PORT_HDMIE, },
2114                 [PORT_F] = { DVO_PORT_DPF, DVO_PORT_HDMIF, },
2115         };
2116 
2117         if (port == PORT_A || port >= ARRAY_SIZE(port_mapping))
2118                 return false;
2119 
2120         if ((child->device_type & DEVICE_TYPE_DP_DUAL_MODE_BITS) !=
2121             (DEVICE_TYPE_DP_DUAL_MODE & DEVICE_TYPE_DP_DUAL_MODE_BITS))
2122                 return false;
2123 
2124         if (child->dvo_port == port_mapping[port].dp)
2125                 return true;
2126 
2127         /* Only accept a HDMI dvo_port as DP++ if it has an AUX channel */
2128         if (child->dvo_port == port_mapping[port].hdmi &&
2129             child->aux_channel != 0)
2130                 return true;
2131 
2132         return false;
2133 }
2134 
2135 bool intel_bios_is_port_dp_dual_mode(struct drm_i915_private *dev_priv,
2136                                      enum port port)
2137 {
2138         const struct child_device_config *child;
2139         int i;
2140 
2141         for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
2142                 child = dev_priv->vbt.child_dev + i;
2143 
2144                 if (child_dev_is_dp_dual_mode(child, port))
2145                         return true;
2146         }
2147 
2148         return false;
2149 }
2150 
2151 /**
2152  * intel_bios_is_dsi_present - is DSI present in VBT
2153  * @dev_priv:   i915 device instance
2154  * @port:       port for DSI if present
2155  *
2156  * Return true if DSI is present, and return the port in %port.
2157  */
2158 bool intel_bios_is_dsi_present(struct drm_i915_private *dev_priv,
2159                                enum port *port)
2160 {
2161         const struct child_device_config *child;
2162         u8 dvo_port;
2163         int i;
2164 
2165         for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
2166                 child = dev_priv->vbt.child_dev + i;
2167 
2168                 if (!(child->device_type & DEVICE_TYPE_MIPI_OUTPUT))
2169                         continue;
2170 
2171                 dvo_port = child->dvo_port;
2172 
2173                 if (dvo_port == DVO_PORT_MIPIA ||
2174                     (dvo_port == DVO_PORT_MIPIB && INTEL_GEN(dev_priv) >= 11) ||
2175                     (dvo_port == DVO_PORT_MIPIC && INTEL_GEN(dev_priv) < 11)) {
2176                         if (port)
2177                                 *port = dvo_port - DVO_PORT_MIPIA;
2178                         return true;
2179                 } else if (dvo_port == DVO_PORT_MIPIB ||
2180                            dvo_port == DVO_PORT_MIPIC ||
2181                            dvo_port == DVO_PORT_MIPID) {
2182                         DRM_DEBUG_KMS("VBT has unsupported DSI port %c\n",
2183                                       port_name(dvo_port - DVO_PORT_MIPIA));
2184                 }
2185         }
2186 
2187         return false;
2188 }
2189 
2190 /**
2191  * intel_bios_is_port_hpd_inverted - is HPD inverted for %port
2192  * @i915:       i915 device instance
2193  * @port:       port to check
2194  *
2195  * Return true if HPD should be inverted for %port.
2196  */
2197 bool
2198 intel_bios_is_port_hpd_inverted(const struct drm_i915_private *i915,
2199                                 enum port port)
2200 {
2201         const struct child_device_config *child =
2202                 i915->vbt.ddi_port_info[port].child;
2203 
2204         if (WARN_ON_ONCE(!IS_GEN9_LP(i915)))
2205                 return false;
2206 
2207         return child && child->hpd_invert;
2208 }
2209 
2210 /**
2211  * intel_bios_is_lspcon_present - if LSPCON is attached on %port
2212  * @i915:       i915 device instance
2213  * @port:       port to check
2214  *
2215  * Return true if LSPCON is present on this port
2216  */
2217 bool
2218 intel_bios_is_lspcon_present(const struct drm_i915_private *i915,
2219                              enum port port)
2220 {
2221         const struct child_device_config *child =
2222                 i915->vbt.ddi_port_info[port].child;
2223 
2224         return HAS_LSPCON(i915) && child && child->lspcon;
2225 }
2226 
2227 enum aux_ch intel_bios_port_aux_ch(struct drm_i915_private *dev_priv,
2228                                    enum port port)
2229 {
2230         const struct ddi_vbt_port_info *info =
2231                 &dev_priv->vbt.ddi_port_info[port];
2232         enum aux_ch aux_ch;
2233 
2234         if (!info->alternate_aux_channel) {
2235                 aux_ch = (enum aux_ch)port;
2236 
2237                 DRM_DEBUG_KMS("using AUX %c for port %c (platform default)\n",
2238                               aux_ch_name(aux_ch), port_name(port));
2239                 return aux_ch;
2240         }
2241 
2242         switch (info->alternate_aux_channel) {
2243         case DP_AUX_A:
2244                 aux_ch = AUX_CH_A;
2245                 break;
2246         case DP_AUX_B:
2247                 aux_ch = AUX_CH_B;
2248                 break;
2249         case DP_AUX_C:
2250                 aux_ch = AUX_CH_C;
2251                 break;
2252         case DP_AUX_D:
2253                 aux_ch = AUX_CH_D;
2254                 break;
2255         case DP_AUX_E:
2256                 aux_ch = AUX_CH_E;
2257                 break;
2258         case DP_AUX_F:
2259                 aux_ch = AUX_CH_F;
2260                 break;
2261         default:
2262                 MISSING_CASE(info->alternate_aux_channel);
2263                 aux_ch = AUX_CH_A;
2264                 break;
2265         }
2266 
2267         DRM_DEBUG_KMS("using AUX %c for port %c (VBT)\n",
2268                       aux_ch_name(aux_ch), port_name(port));
2269 
2270         return aux_ch;
2271 }
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/gpu/drm/i915/display/intel_bios.c

DEFINITIONS
