drivers/gpu/drm/i915/intel_bios.c

   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 #include <linux/dmi.h>
  28 #include <drm/drm_dp_helper.h>
  29 #include <drm/drmP.h>
  30 #include <drm/i915_drm.h>
  31 #include "i915_drv.h"
  32 #include "intel_bios.h"
  33
  34 #define SLAVE_ADDR1     0x70
  35 #define SLAVE_ADDR2     0x72
  36
  37 static int panel_type;
  38
  39 static void *
  40 find_section(struct bdb_header *bdb, int section_id)
  41 {
  42         u8 *base = (u8 *)bdb;
  43         int index = 0;
  44         u16 total, current_size;
  45         u8 current_id;
  46
  47         /* skip to first section */
  48         index += bdb->header_size;
  49         total = bdb->bdb_size;
  50
  51         /* walk the sections looking for section_id */
  52         while (index < total) {
  53                 current_id = *(base + index);
  54                 index++;
  55                 current_size = *((u16 *)(base + index));
  56                 index += 2;
  57                 if (current_id == section_id)
  58                         return base + index;
  59                 index += current_size;
  60         }
  61
  62         return NULL;
  63 }
  64
  65 static u16
  66 get_blocksize(void *p)
  67 {
  68         u16 *block_ptr, block_size;
  69
  70         block_ptr = (u16 *)((char *)p - 2);
  71         block_size = *block_ptr;
  72         return block_size;
  73 }
  74
  75 static void
  76 fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
  77                         const struct lvds_dvo_timing *dvo_timing)
  78 {
  79         panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
  80                 dvo_timing->hactive_lo;
  81         panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
  82                 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
  83         panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
  84                 dvo_timing->hsync_pulse_width;
  85         panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
  86                 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
  87
  88         panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
  89                 dvo_timing->vactive_lo;
  90         panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
  91                 dvo_timing->vsync_off;
  92         panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
  93                 dvo_timing->vsync_pulse_width;
  94         panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
  95                 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
  96         panel_fixed_mode->clock = dvo_timing->clock * 10;
  97         panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
  98
  99         if (dvo_timing->hsync_positive)
 100                 panel_fixed_mode->flags |= DRM_MODE_FLAG_PHSYNC;
 101         else
 102                 panel_fixed_mode->flags |= DRM_MODE_FLAG_NHSYNC;
 103
 104         if (dvo_timing->vsync_positive)
 105                 panel_fixed_mode->flags |= DRM_MODE_FLAG_PVSYNC;
 106         else
 107                 panel_fixed_mode->flags |= DRM_MODE_FLAG_NVSYNC;
 108
 109         /* Some VBTs have bogus h/vtotal values */
 110         if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
 111                 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
 112         if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
 113                 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
 114
 115         drm_mode_set_name(panel_fixed_mode);
 116 }
 117
 118 static bool
 119 lvds_dvo_timing_equal_size(const struct lvds_dvo_timing *a,
 120                            const struct lvds_dvo_timing *b)
 121 {
 122         if (a->hactive_hi != b->hactive_hi ||
 123             a->hactive_lo != b->hactive_lo)
 124                 return false;
 125
 126         if (a->hsync_off_hi != b->hsync_off_hi ||
 127             a->hsync_off_lo != b->hsync_off_lo)
 128                 return false;
 129
 130         if (a->hsync_pulse_width != b->hsync_pulse_width)
 131                 return false;
 132
 133         if (a->hblank_hi != b->hblank_hi ||
 134             a->hblank_lo != b->hblank_lo)
 135                 return false;
 136
 137         if (a->vactive_hi != b->vactive_hi ||
 138             a->vactive_lo != b->vactive_lo)
 139                 return false;
 140
 141         if (a->vsync_off != b->vsync_off)
 142                 return false;
 143
 144         if (a->vsync_pulse_width != b->vsync_pulse_width)
 145                 return false;
 146
 147         if (a->vblank_hi != b->vblank_hi ||
 148             a->vblank_lo != b->vblank_lo)
 149                 return false;
 150
 151         return true;
 152 }
 153
 154 static const struct lvds_dvo_timing *
 155 get_lvds_dvo_timing(const struct bdb_lvds_lfp_data *lvds_lfp_data,
 156                     const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs,
 157                     int index)
 158 {
 159         /*
 160          * the size of fp_timing varies on the different platform.
 161          * So calculate the DVO timing relative offset in LVDS data
 162          * entry to get the DVO timing entry
 163          */
 164
 165         int lfp_data_size =
 166                 lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
 167                 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
 168         int dvo_timing_offset =
 169                 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset -
 170                 lvds_lfp_data_ptrs->ptr[0].fp_timing_offset;
 171         char *entry = (char *)lvds_lfp_data->data + lfp_data_size * index;
 172
 173         return (struct lvds_dvo_timing *)(entry + dvo_timing_offset);
 174 }
 175
 176 /* get lvds_fp_timing entry
 177  * this function may return NULL if the corresponding entry is invalid
 178  */
 179 static const struct lvds_fp_timing *
 180 get_lvds_fp_timing(const struct bdb_header *bdb,
 181                    const struct bdb_lvds_lfp_data *data,
 182                    const struct bdb_lvds_lfp_data_ptrs *ptrs,
 183                    int index)
 184 {
 185         size_t data_ofs = (const u8 *)data - (const u8 *)bdb;
 186         u16 data_size = ((const u16 *)data)[-1]; /* stored in header */
 187         size_t ofs;
 188
 189         if (index >= ARRAY_SIZE(ptrs->ptr))
 190                 return NULL;
 191         ofs = ptrs->ptr[index].fp_timing_offset;
 192         if (ofs < data_ofs ||
 193             ofs + sizeof(struct lvds_fp_timing) > data_ofs + data_size)
 194                 return NULL;
 195         return (const struct lvds_fp_timing *)((const u8 *)bdb + ofs);
 196 }
 197
 198 /* Try to find integrated panel data */
 199 static void
 200 parse_lfp_panel_data(struct drm_i915_private *dev_priv,
 201                             struct bdb_header *bdb)
 202 {
 203         const struct bdb_lvds_options *lvds_options;
 204         const struct bdb_lvds_lfp_data *lvds_lfp_data;
 205         const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
 206         const struct lvds_dvo_timing *panel_dvo_timing;
 207         const struct lvds_fp_timing *fp_timing;
 208         struct drm_display_mode *panel_fixed_mode;
 209         int i, downclock;
 210
 211         lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
 212         if (!lvds_options)
 213                 return;
 214
 215         dev_priv->vbt.lvds_dither = lvds_options->pixel_dither;
 216         if (lvds_options->panel_type == 0xff)
 217                 return;
 218
 219         panel_type = lvds_options->panel_type;
 220
 221         lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
 222         if (!lvds_lfp_data)
 223                 return;
 224
 225         lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
 226         if (!lvds_lfp_data_ptrs)
 227                 return;
 228
 229         dev_priv->vbt.lvds_vbt = 1;
 230
 231         panel_dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
 232                                                lvds_lfp_data_ptrs,
 233                                                lvds_options->panel_type);
 234
 235         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 236         if (!panel_fixed_mode)
 237                 return;
 238
 239         fill_detail_timing_data(panel_fixed_mode, panel_dvo_timing);
 240
 241         dev_priv->vbt.lfp_lvds_vbt_mode = panel_fixed_mode;
 242
 243         DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n");
 244         drm_mode_debug_printmodeline(panel_fixed_mode);
 245
 246         /*
 247          * Iterate over the LVDS panel timing info to find the lowest clock
 248          * for the native resolution.
 249          */
 250         downclock = panel_dvo_timing->clock;
 251         for (i = 0; i < 16; i++) {
 252                 const struct lvds_dvo_timing *dvo_timing;
 253
 254                 dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
 255                                                  lvds_lfp_data_ptrs,
 256                                                  i);
 257                 if (lvds_dvo_timing_equal_size(dvo_timing, panel_dvo_timing) &&
 258                     dvo_timing->clock < downclock)
 259                         downclock = dvo_timing->clock;
 260         }
 261
 262         if (downclock < panel_dvo_timing->clock && i915_lvds_downclock) {
 263                 dev_priv->lvds_downclock_avail = 1;
 264                 dev_priv->lvds_downclock = downclock * 10;
 265                 DRM_DEBUG_KMS("LVDS downclock is found in VBT. "
 266                               "Normal Clock %dKHz, downclock %dKHz\n",
 267                               panel_fixed_mode->clock, 10*downclock);
 268         }
 269
 270         fp_timing = get_lvds_fp_timing(bdb, lvds_lfp_data,
 271                                        lvds_lfp_data_ptrs,
 272                                        lvds_options->panel_type);
 273         if (fp_timing) {
 274                 /* check the resolution, just to be sure */
 275                 if (fp_timing->x_res == panel_fixed_mode->hdisplay &&
 276                     fp_timing->y_res == panel_fixed_mode->vdisplay) {
 277                         dev_priv->vbt.bios_lvds_val = fp_timing->lvds_reg_val;
 278                         DRM_DEBUG_KMS("VBT initial LVDS value %x\n",
 279                                       dev_priv->vbt.bios_lvds_val);
 280                 }
 281         }
 282 }
 283
 284 static void
 285 parse_lfp_backlight(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
 286 {
 287         const struct bdb_lfp_backlight_data *backlight_data;
 288         const struct bdb_lfp_backlight_data_entry *entry;
 289
 290         backlight_data = find_section(bdb, BDB_LVDS_BACKLIGHT);
 291         if (!backlight_data)
 292                 return;
 293
 294         if (backlight_data->entry_size != sizeof(backlight_data->data[0])) {
 295                 DRM_DEBUG_KMS("Unsupported backlight data entry size %u\n",
 296                               backlight_data->entry_size);
 297                 return;
 298         }
 299
 300         entry = &backlight_data->data[panel_type];
 301
 302         dev_priv->vbt.backlight.pwm_freq_hz = entry->pwm_freq_hz;
 303         dev_priv->vbt.backlight.active_low_pwm = entry->active_low_pwm;
 304         DRM_DEBUG_KMS("VBT backlight PWM modulation frequency %u Hz, "
 305                       "active %s, min brightness %u, level %u\n",
 306                       dev_priv->vbt.backlight.pwm_freq_hz,
 307                       dev_priv->vbt.backlight.active_low_pwm ? "low" : "high",
 308                       entry->min_brightness,
 309                       backlight_data->level[panel_type]);
 310 }
 311
 312 /* Try to find sdvo panel data */
 313 static void
 314 parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
 315                       struct bdb_header *bdb)
 316 {
 317         struct lvds_dvo_timing *dvo_timing;
 318         struct drm_display_mode *panel_fixed_mode;
 319         int index;
 320
 321         index = i915_vbt_sdvo_panel_type;
 322         if (index == -2) {
 323                 DRM_DEBUG_KMS("Ignore SDVO panel mode from BIOS VBT tables.\n");
 324                 return;
 325         }
 326
 327         if (index == -1) {
 328                 struct bdb_sdvo_lvds_options *sdvo_lvds_options;
 329
 330                 sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
 331                 if (!sdvo_lvds_options)
 332                         return;
 333
 334                 index = sdvo_lvds_options->panel_type;
 335         }
 336
 337         dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
 338         if (!dvo_timing)
 339                 return;
 340
 341         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 342         if (!panel_fixed_mode)
 343                 return;
 344
 345         fill_detail_timing_data(panel_fixed_mode, dvo_timing + index);
 346
 347         dev_priv->vbt.sdvo_lvds_vbt_mode = panel_fixed_mode;
 348
 349         DRM_DEBUG_KMS("Found SDVO panel mode in BIOS VBT tables:\n");
 350         drm_mode_debug_printmodeline(panel_fixed_mode);
 351 }
 352
 353 static int intel_bios_ssc_frequency(struct drm_device *dev,
 354                                     bool alternate)
 355 {
 356         switch (INTEL_INFO(dev)->gen) {
 357         case 2:
 358                 return alternate ? 66667 : 48000;
 359         case 3:
 360         case 4:
 361                 return alternate ? 100000 : 96000;
 362         default:
 363                 return alternate ? 100000 : 120000;
 364         }
 365 }
 366
 367 static void
 368 parse_general_features(struct drm_i915_private *dev_priv,
 369                        struct bdb_header *bdb)
 370 {
 371         struct drm_device *dev = dev_priv->dev;
 372         struct bdb_general_features *general;
 373
 374         general = find_section(bdb, BDB_GENERAL_FEATURES);
 375         if (general) {
 376                 dev_priv->vbt.int_tv_support = general->int_tv_support;
 377                 dev_priv->vbt.int_crt_support = general->int_crt_support;
 378                 dev_priv->vbt.lvds_use_ssc = general->enable_ssc;
 379                 dev_priv->vbt.lvds_ssc_freq =
 380                         intel_bios_ssc_frequency(dev, general->ssc_freq);
 381                 dev_priv->vbt.display_clock_mode = general->display_clock_mode;
 382                 dev_priv->vbt.fdi_rx_polarity_inverted = general->fdi_rx_polarity_inverted;
 383                 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",
 384                               dev_priv->vbt.int_tv_support,
 385                               dev_priv->vbt.int_crt_support,
 386                               dev_priv->vbt.lvds_use_ssc,
 387                               dev_priv->vbt.lvds_ssc_freq,
 388                               dev_priv->vbt.display_clock_mode,
 389                               dev_priv->vbt.fdi_rx_polarity_inverted);
 390         }
 391 }
 392
 393 static void
 394 parse_general_definitions(struct drm_i915_private *dev_priv,
 395                           struct bdb_header *bdb)
 396 {
 397         struct bdb_general_definitions *general;
 398
 399         general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 400         if (general) {
 401                 u16 block_size = get_blocksize(general);
 402                 if (block_size >= sizeof(*general)) {
 403                         int bus_pin = general->crt_ddc_gmbus_pin;
 404                         DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
 405                         if (intel_gmbus_is_port_valid(bus_pin))
 406                                 dev_priv->vbt.crt_ddc_pin = bus_pin;
 407                 } else {
 408                         DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
 409                                       block_size);
 410                 }
 411         }
 412 }
 413
 414 static void
 415 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
 416                           struct bdb_header *bdb)
 417 {
 418         struct sdvo_device_mapping *p_mapping;
 419         struct bdb_general_definitions *p_defs;
 420         union child_device_config *p_child;
 421         int i, child_device_num, count;
 422         u16     block_size;
 423
 424         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 425         if (!p_defs) {
 426                 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
 427                 return;
 428         }
 429         /* judge whether the size of child device meets the requirements.
 430          * If the child device size obtained from general definition block
 431          * is different with sizeof(struct child_device_config), skip the
 432          * parsing of sdvo device info
 433          */
 434         if (p_defs->child_dev_size != sizeof(*p_child)) {
 435                 /* different child dev size . Ignore it */
 436                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 437                 return;
 438         }
 439         /* get the block size of general definitions */
 440         block_size = get_blocksize(p_defs);
 441         /* get the number of child device */
 442         child_device_num = (block_size - sizeof(*p_defs)) /
 443                                 sizeof(*p_child);
 444         count = 0;
 445         for (i = 0; i < child_device_num; i++) {
 446                 p_child = &(p_defs->devices[i]);
 447                 if (!p_child->old.device_type) {
 448                         /* skip the device block if device type is invalid */
 449                         continue;
 450                 }
 451                 if (p_child->old.slave_addr != SLAVE_ADDR1 &&
 452                         p_child->old.slave_addr != SLAVE_ADDR2) {
 453                         /*
 454                          * If the slave address is neither 0x70 nor 0x72,
 455                          * it is not a SDVO device. Skip it.
 456                          */
 457                         continue;
 458                 }
 459                 if (p_child->old.dvo_port != DEVICE_PORT_DVOB &&
 460                         p_child->old.dvo_port != DEVICE_PORT_DVOC) {
 461                         /* skip the incorrect SDVO port */
 462                         DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n");
 463                         continue;
 464                 }
 465                 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
 466                                 " %s port\n",
 467                                 p_child->old.slave_addr,
 468                                 (p_child->old.dvo_port == DEVICE_PORT_DVOB) ?
 469                                         "SDVOB" : "SDVOC");
 470                 p_mapping = &(dev_priv->sdvo_mappings[p_child->old.dvo_port - 1]);
 471                 if (!p_mapping->initialized) {
 472                         p_mapping->dvo_port = p_child->old.dvo_port;
 473                         p_mapping->slave_addr = p_child->old.slave_addr;
 474                         p_mapping->dvo_wiring = p_child->old.dvo_wiring;
 475                         p_mapping->ddc_pin = p_child->old.ddc_pin;
 476                         p_mapping->i2c_pin = p_child->old.i2c_pin;
 477                         p_mapping->initialized = 1;
 478                         DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n",
 479                                       p_mapping->dvo_port,
 480                                       p_mapping->slave_addr,
 481                                       p_mapping->dvo_wiring,
 482                                       p_mapping->ddc_pin,
 483                                       p_mapping->i2c_pin);
 484                 } else {
 485                         DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
 486                                          "two SDVO device.\n");
 487                 }
 488                 if (p_child->old.slave2_addr) {
 489                         /* Maybe this is a SDVO device with multiple inputs */
 490                         /* And the mapping info is not added */
 491                         DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
 492                                 " is a SDVO device with multiple inputs.\n");
 493                 }
 494                 count++;
 495         }
 496
 497         if (!count) {
 498                 /* No SDVO device info is found */
 499                 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
 500         }
 501         return;
 502 }
 503
 504 static void
 505 parse_driver_features(struct drm_i915_private *dev_priv,
 506                        struct bdb_header *bdb)
 507 {
 508         struct bdb_driver_features *driver;
 509
 510         driver = find_section(bdb, BDB_DRIVER_FEATURES);
 511         if (!driver)
 512                 return;
 513
 514         if (driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
 515                 dev_priv->vbt.edp_support = 1;
 516
 517         if (driver->dual_frequency)
 518                 dev_priv->render_reclock_avail = true;
 519 }
 520
 521 static void
 522 parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
 523 {
 524         struct bdb_edp *edp;
 525         struct edp_power_seq *edp_pps;
 526         struct edp_link_params *edp_link_params;
 527
 528         edp = find_section(bdb, BDB_EDP);
 529         if (!edp) {
 530                 if (dev_priv->vbt.edp_support)
 531                         DRM_DEBUG_KMS("No eDP BDB found but eDP panel supported.\n");
 532                 return;
 533         }
 534
 535         switch ((edp->color_depth >> (panel_type * 2)) & 3) {
 536         case EDP_18BPP:
 537                 dev_priv->vbt.edp_bpp = 18;
 538                 break;
 539         case EDP_24BPP:
 540                 dev_priv->vbt.edp_bpp = 24;
 541                 break;
 542         case EDP_30BPP:
 543                 dev_priv->vbt.edp_bpp = 30;
 544                 break;
 545         }
 546
 547         /* Get the eDP sequencing and link info */
 548         edp_pps = &edp->power_seqs[panel_type];
 549         edp_link_params = &edp->link_params[panel_type];
 550
 551         dev_priv->vbt.edp_pps = *edp_pps;
 552
 553         dev_priv->vbt.edp_rate = edp_link_params->rate ? DP_LINK_BW_2_7 :
 554                 DP_LINK_BW_1_62;
 555         switch (edp_link_params->lanes) {
 556         case 0:
 557                 dev_priv->vbt.edp_lanes = 1;
 558                 break;
 559         case 1:
 560                 dev_priv->vbt.edp_lanes = 2;
 561                 break;
 562         case 3:
 563         default:
 564                 dev_priv->vbt.edp_lanes = 4;
 565                 break;
 566         }
 567         switch (edp_link_params->preemphasis) {
 568         case 0:
 569                 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_0;
 570                 break;
 571         case 1:
 572                 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_3_5;
 573                 break;
 574         case 2:
 575                 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_6;
 576                 break;
 577         case 3:
 578                 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_9_5;
 579                 break;
 580         }
 581         switch (edp_link_params->vswing) {
 582         case 0:
 583                 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_400;
 584                 break;
 585         case 1:
 586                 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_600;
 587                 break;
 588         case 2:
 589                 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_800;
 590                 break;
 591         case 3:
 592                 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_1200;
 593                 break;
 594         }
 595 }
 596
 597 static void
 598 parse_mipi(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
 599 {
 600         struct bdb_mipi *mipi;
 601
 602         mipi = find_section(bdb, BDB_MIPI);
 603         if (!mipi) {
 604                 DRM_DEBUG_KMS("No MIPI BDB found");
 605                 return;
 606         }
 607
 608         /* XXX: add more info */
 609         dev_priv->vbt.dsi.panel_id = mipi->panel_id;
 610 }
 611
 612 static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
 613                            struct bdb_header *bdb)
 614 {
 615         union child_device_config *it, *child = NULL;
 616         struct ddi_vbt_port_info *info = &dev_priv->vbt.ddi_port_info[port];
 617         uint8_t hdmi_level_shift;
 618         int i, j;
 619         bool is_dvi, is_hdmi, is_dp, is_edp, is_crt;
 620         uint8_t aux_channel;
 621         /* Each DDI port can have more than one value on the "DVO Port" field,
 622          * so look for all the possible values for each port and abort if more
 623          * than one is found. */
 624         int dvo_ports[][2] = {
 625                 {DVO_PORT_HDMIA, DVO_PORT_DPA},
 626                 {DVO_PORT_HDMIB, DVO_PORT_DPB},
 627                 {DVO_PORT_HDMIC, DVO_PORT_DPC},
 628                 {DVO_PORT_HDMID, DVO_PORT_DPD},
 629                 {DVO_PORT_CRT, -1 /* Port E can only be DVO_PORT_CRT */ },
 630         };
 631
 632         /* Find the child device to use, abort if more than one found. */
 633         for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
 634                 it = dev_priv->vbt.child_dev + i;
 635
 636                 for (j = 0; j < 2; j++) {
 637                         if (dvo_ports[port][j] == -1)
 638                                 break;
 639
 640                         if (it->common.dvo_port == dvo_ports[port][j]) {
 641                                 if (child) {
 642                                         DRM_DEBUG_KMS("More than one child device for port %c in VBT.\n",
 643                                                       port_name(port));
 644                                         return;
 645                                 }
 646                                 child = it;
 647                         }
 648                 }
 649         }
 650         if (!child)
 651                 return;
 652
 653         aux_channel = child->raw[25];
 654
 655         is_dvi = child->common.device_type & DEVICE_TYPE_TMDS_DVI_SIGNALING;
 656         is_dp = child->common.device_type & DEVICE_TYPE_DISPLAYPORT_OUTPUT;
 657         is_crt = child->common.device_type & DEVICE_TYPE_ANALOG_OUTPUT;
 658         is_hdmi = is_dvi && (child->common.device_type & DEVICE_TYPE_NOT_HDMI_OUTPUT) == 0;
 659         is_edp = is_dp && (child->common.device_type & DEVICE_TYPE_INTERNAL_CONNECTOR);
 660
 661         info->supports_dvi = is_dvi;
 662         info->supports_hdmi = is_hdmi;
 663         info->supports_dp = is_dp;
 664
 665         DRM_DEBUG_KMS("Port %c VBT info: DP:%d HDMI:%d DVI:%d EDP:%d CRT:%d\n",
 666                       port_name(port), is_dp, is_hdmi, is_dvi, is_edp, is_crt);
 667
 668         if (is_edp && is_dvi)
 669                 DRM_DEBUG_KMS("Internal DP port %c is TMDS compatible\n",
 670                               port_name(port));
 671         if (is_crt && port != PORT_E)
 672                 DRM_DEBUG_KMS("Port %c is analog\n", port_name(port));
 673         if (is_crt && (is_dvi || is_dp))
 674                 DRM_DEBUG_KMS("Analog port %c is also DP or TMDS compatible\n",
 675                               port_name(port));
 676         if (is_dvi && (port == PORT_A || port == PORT_E))
 677                 DRM_DEBUG_KMS("Port %c is TMDS compabile\n", port_name(port));
 678         if (!is_dvi && !is_dp && !is_crt)
 679                 DRM_DEBUG_KMS("Port %c is not DP/TMDS/CRT compatible\n",
 680                               port_name(port));
 681         if (is_edp && (port == PORT_B || port == PORT_C || port == PORT_E))
 682                 DRM_DEBUG_KMS("Port %c is internal DP\n", port_name(port));
 683
 684         if (is_dvi) {
 685                 if (child->common.ddc_pin == 0x05 && port != PORT_B)
 686                         DRM_DEBUG_KMS("Unexpected DDC pin for port B\n");
 687                 if (child->common.ddc_pin == 0x04 && port != PORT_C)
 688                         DRM_DEBUG_KMS("Unexpected DDC pin for port C\n");
 689                 if (child->common.ddc_pin == 0x06 && port != PORT_D)
 690                         DRM_DEBUG_KMS("Unexpected DDC pin for port D\n");
 691         }
 692
 693         if (is_dp) {
 694                 if (aux_channel == 0x40 && port != PORT_A)
 695                         DRM_DEBUG_KMS("Unexpected AUX channel for port A\n");
 696                 if (aux_channel == 0x10 && port != PORT_B)
 697                         DRM_DEBUG_KMS("Unexpected AUX channel for port B\n");
 698                 if (aux_channel == 0x20 && port != PORT_C)
 699                         DRM_DEBUG_KMS("Unexpected AUX channel for port C\n");
 700                 if (aux_channel == 0x30 && port != PORT_D)
 701                         DRM_DEBUG_KMS("Unexpected AUX channel for port D\n");
 702         }
 703
 704         if (bdb->version >= 158) {
 705                 /* The VBT HDMI level shift values match the table we have. */
 706                 hdmi_level_shift = child->raw[7] & 0xF;
 707                 if (hdmi_level_shift < 0xC) {
 708                         DRM_DEBUG_KMS("VBT HDMI level shift for port %c: %d\n",
 709                                       port_name(port),
 710                                       hdmi_level_shift);
 711                         info->hdmi_level_shift = hdmi_level_shift;
 712                 }
 713         }
 714 }
 715
 716 static void parse_ddi_ports(struct drm_i915_private *dev_priv,
 717                             struct bdb_header *bdb)
 718 {
 719         struct drm_device *dev = dev_priv->dev;
 720         enum port port;
 721
 722         if (!HAS_DDI(dev))
 723                 return;
 724
 725         if (!dev_priv->vbt.child_dev_num)
 726                 return;
 727
 728         if (bdb->version < 155)
 729                 return;
 730
 731         for (port = PORT_A; port < I915_MAX_PORTS; port++)
 732                 parse_ddi_port(dev_priv, port, bdb);
 733 }
 734
 735 static void
 736 parse_device_mapping(struct drm_i915_private *dev_priv,
 737                        struct bdb_header *bdb)
 738 {
 739         struct bdb_general_definitions *p_defs;
 740         union child_device_config *p_child, *child_dev_ptr;
 741         int i, child_device_num, count;
 742         u16     block_size;
 743
 744         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 745         if (!p_defs) {
 746                 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
 747                 return;
 748         }
 749         /* judge whether the size of child device meets the requirements.
 750          * If the child device size obtained from general definition block
 751          * is different with sizeof(struct child_device_config), skip the
 752          * parsing of sdvo device info
 753          */
 754         if (p_defs->child_dev_size != sizeof(*p_child)) {
 755                 /* different child dev size . Ignore it */
 756                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 757                 return;
 758         }
 759         /* get the block size of general definitions */
 760         block_size = get_blocksize(p_defs);
 761         /* get the number of child device */
 762         child_device_num = (block_size - sizeof(*p_defs)) /
 763                                 sizeof(*p_child);
 764         count = 0;
 765         /* get the number of child device that is present */
 766         for (i = 0; i < child_device_num; i++) {
 767                 p_child = &(p_defs->devices[i]);
 768                 if (!p_child->common.device_type) {
 769                         /* skip the device block if device type is invalid */
 770                         continue;
 771                 }
 772                 count++;
 773         }
 774         if (!count) {
 775                 DRM_DEBUG_KMS("no child dev is parsed from VBT\n");
 776                 return;
 777         }
 778         dev_priv->vbt.child_dev = kcalloc(count, sizeof(*p_child), GFP_KERNEL);
 779         if (!dev_priv->vbt.child_dev) {
 780                 DRM_DEBUG_KMS("No memory space for child device\n");
 781                 return;
 782         }
 783
 784         dev_priv->vbt.child_dev_num = count;
 785         count = 0;
 786         for (i = 0; i < child_device_num; i++) {
 787                 p_child = &(p_defs->devices[i]);
 788                 if (!p_child->common.device_type) {
 789                         /* skip the device block if device type is invalid */
 790                         continue;
 791                 }
 792                 child_dev_ptr = dev_priv->vbt.child_dev + count;
 793                 count++;
 794                 memcpy((void *)child_dev_ptr, (void *)p_child,
 795                                         sizeof(*p_child));
 796         }
 797         return;
 798 }
 799
 800 static void
 801 init_vbt_defaults(struct drm_i915_private *dev_priv)
 802 {
 803         struct drm_device *dev = dev_priv->dev;
 804         enum port port;
 805
 806         dev_priv->vbt.crt_ddc_pin = GMBUS_PORT_VGADDC;
 807
 808         /* LFP panel data */
 809         dev_priv->vbt.lvds_dither = 1;
 810         dev_priv->vbt.lvds_vbt = 0;
 811
 812         /* SDVO panel data */
 813         dev_priv->vbt.sdvo_lvds_vbt_mode = NULL;
 814
 815         /* general features */
 816         dev_priv->vbt.int_tv_support = 1;
 817         dev_priv->vbt.int_crt_support = 1;
 818
 819         /* Default to using SSC */
 820         dev_priv->vbt.lvds_use_ssc = 1;
 821         /*
 822          * Core/SandyBridge/IvyBridge use alternative (120MHz) reference
 823          * clock for LVDS.
 824          */
 825         dev_priv->vbt.lvds_ssc_freq = intel_bios_ssc_frequency(dev,
 826                         !HAS_PCH_SPLIT(dev));
 827         DRM_DEBUG_KMS("Set default to SSC at %d kHz\n", dev_priv->vbt.lvds_ssc_freq);
 828
 829         for (port = PORT_A; port < I915_MAX_PORTS; port++) {
 830                 struct ddi_vbt_port_info *info =
 831                         &dev_priv->vbt.ddi_port_info[port];
 832
 833                 /* Recommended BSpec default: 800mV 0dB. */
 834                 info->hdmi_level_shift = 6;
 835
 836                 info->supports_dvi = (port != PORT_A && port != PORT_E);
 837                 info->supports_hdmi = info->supports_dvi;
 838                 info->supports_dp = (port != PORT_E);
 839         }
 840 }
 841
 842 static int intel_no_opregion_vbt_callback(const struct dmi_system_id *id)
 843 {
 844         DRM_DEBUG_KMS("Falling back to manually reading VBT from "
 845                       "VBIOS ROM for %s\n",
 846                       id->ident);
 847         return 1;
 848 }
 849
 850 static const struct dmi_system_id intel_no_opregion_vbt[] = {
 851         {
 852                 .callback = intel_no_opregion_vbt_callback,
 853                 .ident = "ThinkCentre A57",
 854                 .matches = {
 855                         DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 856                         DMI_MATCH(DMI_PRODUCT_NAME, "97027RG"),
 857                 },
 858         },
 859         { }
 860 };
 861
 862 /**
 863  * intel_parse_bios - find VBT and initialize settings from the BIOS
 864  * @dev: DRM device
 865  *
 866  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
 867  * to appropriate values.
 868  *
 869  * Returns 0 on success, nonzero on failure.
 870  */
 871 int
 872 intel_parse_bios(struct drm_device *dev)
 873 {
 874         struct drm_i915_private *dev_priv = dev->dev_private;
 875         struct pci_dev *pdev = dev->pdev;
 876         struct bdb_header *bdb = NULL;
 877         u8 __iomem *bios = NULL;
 878
 879         if (HAS_PCH_NOP(dev))
 880                 return -ENODEV;
 881
 882         init_vbt_defaults(dev_priv);
 883
 884         /* XXX Should this validation be moved to intel_opregion.c? */
 885         if (!dmi_check_system(intel_no_opregion_vbt) && dev_priv->opregion.vbt) {
 886                 struct vbt_header *vbt = dev_priv->opregion.vbt;
 887                 if (memcmp(vbt->signature, "$VBT", 4) == 0) {
 888                         DRM_DEBUG_KMS("Using VBT from OpRegion: %20s\n",
 889                                          vbt->signature);
 890                         bdb = (struct bdb_header *)((char *)vbt + vbt->bdb_offset);
 891                 } else
 892                         dev_priv->opregion.vbt = NULL;
 893         }
 894
 895         if (bdb == NULL) {
 896                 struct vbt_header *vbt = NULL;
 897                 size_t size;
 898                 int i;
 899
 900                 bios = pci_map_rom(pdev, &size);
 901                 if (!bios)
 902                         return -1;
 903
 904                 /* Scour memory looking for the VBT signature */
 905                 for (i = 0; i + 4 < size; i++) {
 906                         if (!memcmp(bios + i, "$VBT", 4)) {
 907                                 vbt = (struct vbt_header *)(bios + i);
 908                                 break;
 909                         }
 910                 }
 911
 912                 if (!vbt) {
 913                         DRM_DEBUG_DRIVER("VBT signature missing\n");
 914                         pci_unmap_rom(pdev, bios);
 915                         return -1;
 916                 }
 917
 918                 bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
 919         }
 920
 921         /* Grab useful general definitions */
 922         parse_general_features(dev_priv, bdb);
 923         parse_general_definitions(dev_priv, bdb);
 924         parse_lfp_panel_data(dev_priv, bdb);
 925         parse_lfp_backlight(dev_priv, bdb);
 926         parse_sdvo_panel_data(dev_priv, bdb);
 927         parse_sdvo_device_mapping(dev_priv, bdb);
 928         parse_device_mapping(dev_priv, bdb);
 929         parse_driver_features(dev_priv, bdb);
 930         parse_edp(dev_priv, bdb);
 931         parse_mipi(dev_priv, bdb);
 932         parse_ddi_ports(dev_priv, bdb);
 933
 934         if (bios)
 935                 pci_unmap_rom(pdev, bios);
 936
 937         return 0;
 938 }
 939
 940 /* Ensure that vital registers have been initialised, even if the BIOS
 941  * is absent or just failing to do its job.
 942  */
 943 void intel_setup_bios(struct drm_device *dev)
 944 {
 945         struct drm_i915_private *dev_priv = dev->dev_private;
 946
 947          /* Set the Panel Power On/Off timings if uninitialized. */
 948         if (!HAS_PCH_SPLIT(dev) &&
 949             I915_READ(PP_ON_DELAYS) == 0 && I915_READ(PP_OFF_DELAYS) == 0) {
 950                 /* Set T2 to 40ms and T5 to 200ms */
 951                 I915_WRITE(PP_ON_DELAYS, 0x019007d0);
 952
 953                 /* Set T3 to 35ms and Tx to 200ms */
 954                 I915_WRITE(PP_OFF_DELAYS, 0x015e07d0);
 955         }
 956 }