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, drrs_mode;
 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         drrs_mode = (lvds_options->dps_panel_type_bits
 222                                 >> (panel_type * 2)) & MODE_MASK;
 223         /*
 224          * VBT has static DRRS = 0 and seamless DRRS = 2.
 225          * The below piece of code is required to adjust vbt.drrs_type
 226          * to match the enum drrs_support_type.
 227          */
 228         switch (drrs_mode) {
 229         case 0:
 230                 dev_priv->vbt.drrs_type = STATIC_DRRS_SUPPORT;
 231                 DRM_DEBUG_KMS("DRRS supported mode is static\n");
 232                 break;
 233         case 2:
 234                 dev_priv->vbt.drrs_type = SEAMLESS_DRRS_SUPPORT;
 235                 DRM_DEBUG_KMS("DRRS supported mode is seamless\n");
 236                 break;
 237         default:
 238                 dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED;
 239                 DRM_DEBUG_KMS("DRRS not supported (VBT input)\n");
 240                 break;
 241         }
 242
 243         lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
 244         if (!lvds_lfp_data)
 245                 return;
 246
 247         lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
 248         if (!lvds_lfp_data_ptrs)
 249                 return;
 250
 251         dev_priv->vbt.lvds_vbt = 1;
 252
 253         panel_dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
 254                                                lvds_lfp_data_ptrs,
 255                                                lvds_options->panel_type);
 256
 257         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 258         if (!panel_fixed_mode)
 259                 return;
 260
 261         fill_detail_timing_data(panel_fixed_mode, panel_dvo_timing);
 262
 263         dev_priv->vbt.lfp_lvds_vbt_mode = panel_fixed_mode;
 264
 265         DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n");
 266         drm_mode_debug_printmodeline(panel_fixed_mode);
 267
 268         /*
 269          * Iterate over the LVDS panel timing info to find the lowest clock
 270          * for the native resolution.
 271          */
 272         downclock = panel_dvo_timing->clock;
 273         for (i = 0; i < 16; i++) {
 274                 const struct lvds_dvo_timing *dvo_timing;
 275
 276                 dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
 277                                                  lvds_lfp_data_ptrs,
 278                                                  i);
 279                 if (lvds_dvo_timing_equal_size(dvo_timing, panel_dvo_timing) &&
 280                     dvo_timing->clock < downclock)
 281                         downclock = dvo_timing->clock;
 282         }
 283
 284         if (downclock < panel_dvo_timing->clock && i915.lvds_downclock) {
 285                 dev_priv->lvds_downclock_avail = 1;
 286                 dev_priv->lvds_downclock = downclock * 10;
 287                 DRM_DEBUG_KMS("LVDS downclock is found in VBT. "
 288                               "Normal Clock %dKHz, downclock %dKHz\n",
 289                               panel_fixed_mode->clock, 10*downclock);
 290         }
 291
 292         fp_timing = get_lvds_fp_timing(bdb, lvds_lfp_data,
 293                                        lvds_lfp_data_ptrs,
 294                                        lvds_options->panel_type);
 295         if (fp_timing) {
 296                 /* check the resolution, just to be sure */
 297                 if (fp_timing->x_res == panel_fixed_mode->hdisplay &&
 298                     fp_timing->y_res == panel_fixed_mode->vdisplay) {
 299                         dev_priv->vbt.bios_lvds_val = fp_timing->lvds_reg_val;
 300                         DRM_DEBUG_KMS("VBT initial LVDS value %x\n",
 301                                       dev_priv->vbt.bios_lvds_val);
 302                 }
 303         }
 304 }
 305
 306 static void
 307 parse_lfp_backlight(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
 308 {
 309         const struct bdb_lfp_backlight_data *backlight_data;
 310         const struct bdb_lfp_backlight_data_entry *entry;
 311
 312         backlight_data = find_section(bdb, BDB_LVDS_BACKLIGHT);
 313         if (!backlight_data)
 314                 return;
 315
 316         if (backlight_data->entry_size != sizeof(backlight_data->data[0])) {
 317                 DRM_DEBUG_KMS("Unsupported backlight data entry size %u\n",
 318                               backlight_data->entry_size);
 319                 return;
 320         }
 321
 322         entry = &backlight_data->data[panel_type];
 323
 324         dev_priv->vbt.backlight.pwm_freq_hz = entry->pwm_freq_hz;
 325         dev_priv->vbt.backlight.active_low_pwm = entry->active_low_pwm;
 326         DRM_DEBUG_KMS("VBT backlight PWM modulation frequency %u Hz, "
 327                       "active %s, min brightness %u, level %u\n",
 328                       dev_priv->vbt.backlight.pwm_freq_hz,
 329                       dev_priv->vbt.backlight.active_low_pwm ? "low" : "high",
 330                       entry->min_brightness,
 331                       backlight_data->level[panel_type]);
 332 }
 333
 334 /* Try to find sdvo panel data */
 335 static void
 336 parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
 337                       struct bdb_header *bdb)
 338 {
 339         struct lvds_dvo_timing *dvo_timing;
 340         struct drm_display_mode *panel_fixed_mode;
 341         int index;
 342
 343         index = i915.vbt_sdvo_panel_type;
 344         if (index == -2) {
 345                 DRM_DEBUG_KMS("Ignore SDVO panel mode from BIOS VBT tables.\n");
 346                 return;
 347         }
 348
 349         if (index == -1) {
 350                 struct bdb_sdvo_lvds_options *sdvo_lvds_options;
 351
 352                 sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
 353                 if (!sdvo_lvds_options)
 354                         return;
 355
 356                 index = sdvo_lvds_options->panel_type;
 357         }
 358
 359         dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
 360         if (!dvo_timing)
 361                 return;
 362
 363         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 364         if (!panel_fixed_mode)
 365                 return;
 366
 367         fill_detail_timing_data(panel_fixed_mode, dvo_timing + index);
 368
 369         dev_priv->vbt.sdvo_lvds_vbt_mode = panel_fixed_mode;
 370
 371         DRM_DEBUG_KMS("Found SDVO panel mode in BIOS VBT tables:\n");
 372         drm_mode_debug_printmodeline(panel_fixed_mode);
 373 }
 374
 375 static int intel_bios_ssc_frequency(struct drm_device *dev,
 376                                     bool alternate)
 377 {
 378         switch (INTEL_INFO(dev)->gen) {
 379         case 2:
 380                 return alternate ? 66667 : 48000;
 381         case 3:
 382         case 4:
 383                 return alternate ? 100000 : 96000;
 384         default:
 385                 return alternate ? 100000 : 120000;
 386         }
 387 }
 388
 389 static void
 390 parse_general_features(struct drm_i915_private *dev_priv,
 391                        struct bdb_header *bdb)
 392 {
 393         struct drm_device *dev = dev_priv->dev;
 394         struct bdb_general_features *general;
 395
 396         general = find_section(bdb, BDB_GENERAL_FEATURES);
 397         if (general) {
 398                 dev_priv->vbt.int_tv_support = general->int_tv_support;
 399                 dev_priv->vbt.int_crt_support = general->int_crt_support;
 400                 dev_priv->vbt.lvds_use_ssc = general->enable_ssc;
 401                 dev_priv->vbt.lvds_ssc_freq =
 402                         intel_bios_ssc_frequency(dev, general->ssc_freq);
 403                 dev_priv->vbt.display_clock_mode = general->display_clock_mode;
 404                 dev_priv->vbt.fdi_rx_polarity_inverted = general->fdi_rx_polarity_inverted;
 405                 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",
 406                               dev_priv->vbt.int_tv_support,
 407                               dev_priv->vbt.int_crt_support,
 408                               dev_priv->vbt.lvds_use_ssc,
 409                               dev_priv->vbt.lvds_ssc_freq,
 410                               dev_priv->vbt.display_clock_mode,
 411                               dev_priv->vbt.fdi_rx_polarity_inverted);
 412         }
 413 }
 414
 415 static void
 416 parse_general_definitions(struct drm_i915_private *dev_priv,
 417                           struct bdb_header *bdb)
 418 {
 419         struct bdb_general_definitions *general;
 420
 421         general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 422         if (general) {
 423                 u16 block_size = get_blocksize(general);
 424                 if (block_size >= sizeof(*general)) {
 425                         int bus_pin = general->crt_ddc_gmbus_pin;
 426                         DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
 427                         if (intel_gmbus_is_port_valid(bus_pin))
 428                                 dev_priv->vbt.crt_ddc_pin = bus_pin;
 429                 } else {
 430                         DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
 431                                       block_size);
 432                 }
 433         }
 434 }
 435
 436 static void
 437 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
 438                           struct bdb_header *bdb)
 439 {
 440         struct sdvo_device_mapping *p_mapping;
 441         struct bdb_general_definitions *p_defs;
 442         union child_device_config *p_child;
 443         int i, child_device_num, count;
 444         u16     block_size;
 445
 446         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 447         if (!p_defs) {
 448                 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
 449                 return;
 450         }
 451         /* judge whether the size of child device meets the requirements.
 452          * If the child device size obtained from general definition block
 453          * is different with sizeof(struct child_device_config), skip the
 454          * parsing of sdvo device info
 455          */
 456         if (p_defs->child_dev_size != sizeof(*p_child)) {
 457                 /* different child dev size . Ignore it */
 458                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 459                 return;
 460         }
 461         /* get the block size of general definitions */
 462         block_size = get_blocksize(p_defs);
 463         /* get the number of child device */
 464         child_device_num = (block_size - sizeof(*p_defs)) /
 465                                 sizeof(*p_child);
 466         count = 0;
 467         for (i = 0; i < child_device_num; i++) {
 468                 p_child = &(p_defs->devices[i]);
 469                 if (!p_child->old.device_type) {
 470                         /* skip the device block if device type is invalid */
 471                         continue;
 472                 }
 473                 if (p_child->old.slave_addr != SLAVE_ADDR1 &&
 474                         p_child->old.slave_addr != SLAVE_ADDR2) {
 475                         /*
 476                          * If the slave address is neither 0x70 nor 0x72,
 477                          * it is not a SDVO device. Skip it.
 478                          */
 479                         continue;
 480                 }
 481                 if (p_child->old.dvo_port != DEVICE_PORT_DVOB &&
 482                         p_child->old.dvo_port != DEVICE_PORT_DVOC) {
 483                         /* skip the incorrect SDVO port */
 484                         DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n");
 485                         continue;
 486                 }
 487                 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
 488                                 " %s port\n",
 489                                 p_child->old.slave_addr,
 490                                 (p_child->old.dvo_port == DEVICE_PORT_DVOB) ?
 491                                         "SDVOB" : "SDVOC");
 492                 p_mapping = &(dev_priv->sdvo_mappings[p_child->old.dvo_port - 1]);
 493                 if (!p_mapping->initialized) {
 494                         p_mapping->dvo_port = p_child->old.dvo_port;
 495                         p_mapping->slave_addr = p_child->old.slave_addr;
 496                         p_mapping->dvo_wiring = p_child->old.dvo_wiring;
 497                         p_mapping->ddc_pin = p_child->old.ddc_pin;
 498                         p_mapping->i2c_pin = p_child->old.i2c_pin;
 499                         p_mapping->initialized = 1;
 500                         DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n",
 501                                       p_mapping->dvo_port,
 502                                       p_mapping->slave_addr,
 503                                       p_mapping->dvo_wiring,
 504                                       p_mapping->ddc_pin,
 505                                       p_mapping->i2c_pin);
 506                 } else {
 507                         DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
 508                                          "two SDVO device.\n");
 509                 }
 510                 if (p_child->old.slave2_addr) {
 511                         /* Maybe this is a SDVO device with multiple inputs */
 512                         /* And the mapping info is not added */
 513                         DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
 514                                 " is a SDVO device with multiple inputs.\n");
 515                 }
 516                 count++;
 517         }
 518
 519         if (!count) {
 520                 /* No SDVO device info is found */
 521                 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
 522         }
 523         return;
 524 }
 525
 526 static void
 527 parse_driver_features(struct drm_i915_private *dev_priv,
 528                        struct bdb_header *bdb)
 529 {
 530         struct bdb_driver_features *driver;
 531
 532         driver = find_section(bdb, BDB_DRIVER_FEATURES);
 533         if (!driver)
 534                 return;
 535
 536         if (driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
 537                 dev_priv->vbt.edp_support = 1;
 538
 539         if (driver->dual_frequency)
 540                 dev_priv->render_reclock_avail = true;
 541
 542         DRM_DEBUG_KMS("DRRS State Enabled:%d\n", driver->drrs_enabled);
 543         /*
 544          * If DRRS is not supported, drrs_type has to be set to 0.
 545          * This is because, VBT is configured in such a way that
 546          * static DRRS is 0 and DRRS not supported is represented by
 547          * driver->drrs_enabled=false
 548          */
 549         if (!driver->drrs_enabled)
 550                 dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED;
 551 }
 552
 553 static void
 554 parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
 555 {
 556         struct bdb_edp *edp;
 557         struct edp_power_seq *edp_pps;
 558         struct edp_link_params *edp_link_params;
 559
 560         edp = find_section(bdb, BDB_EDP);
 561         if (!edp) {
 562                 if (dev_priv->vbt.edp_support)
 563                         DRM_DEBUG_KMS("No eDP BDB found but eDP panel supported.\n");
 564                 return;
 565         }
 566
 567         switch ((edp->color_depth >> (panel_type * 2)) & 3) {
 568         case EDP_18BPP:
 569                 dev_priv->vbt.edp_bpp = 18;
 570                 break;
 571         case EDP_24BPP:
 572                 dev_priv->vbt.edp_bpp = 24;
 573                 break;
 574         case EDP_30BPP:
 575                 dev_priv->vbt.edp_bpp = 30;
 576                 break;
 577         }
 578
 579         /* Get the eDP sequencing and link info */
 580         edp_pps = &edp->power_seqs[panel_type];
 581         edp_link_params = &edp->link_params[panel_type];
 582
 583         dev_priv->vbt.edp_pps = *edp_pps;
 584
 585         dev_priv->vbt.edp_rate = edp_link_params->rate ? DP_LINK_BW_2_7 :
 586                 DP_LINK_BW_1_62;
 587         switch (edp_link_params->lanes) {
 588         case 0:
 589                 dev_priv->vbt.edp_lanes = 1;
 590                 break;
 591         case 1:
 592                 dev_priv->vbt.edp_lanes = 2;
 593                 break;
 594         case 3:
 595         default:
 596                 dev_priv->vbt.edp_lanes = 4;
 597                 break;
 598         }
 599         switch (edp_link_params->preemphasis) {
 600         case 0:
 601                 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_0;
 602                 break;
 603         case 1:
 604                 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_3_5;
 605                 break;
 606         case 2:
 607                 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_6;
 608                 break;
 609         case 3:
 610                 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_9_5;
 611                 break;
 612         }
 613         switch (edp_link_params->vswing) {
 614         case 0:
 615                 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_400;
 616                 break;
 617         case 1:
 618                 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_600;
 619                 break;
 620         case 2:
 621                 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_800;
 622                 break;
 623         case 3:
 624                 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_1200;
 625                 break;
 626         }
 627 }
 628
 629 static void
 630 parse_mipi(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
 631 {
 632         struct bdb_mipi *mipi;
 633
 634         mipi = find_section(bdb, BDB_MIPI_CONFIG);
 635         if (!mipi) {
 636                 DRM_DEBUG_KMS("No MIPI BDB found");
 637                 return;
 638         }
 639
 640         /* XXX: add more info */
 641         dev_priv->vbt.dsi.panel_id = MIPI_DSI_GENERIC_PANEL_ID;
 642 }
 643
 644 static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
 645                            struct bdb_header *bdb)
 646 {
 647         union child_device_config *it, *child = NULL;
 648         struct ddi_vbt_port_info *info = &dev_priv->vbt.ddi_port_info[port];
 649         uint8_t hdmi_level_shift;
 650         int i, j;
 651         bool is_dvi, is_hdmi, is_dp, is_edp, is_crt;
 652         uint8_t aux_channel;
 653         /* Each DDI port can have more than one value on the "DVO Port" field,
 654          * so look for all the possible values for each port and abort if more
 655          * than one is found. */
 656         int dvo_ports[][2] = {
 657                 {DVO_PORT_HDMIA, DVO_PORT_DPA},
 658                 {DVO_PORT_HDMIB, DVO_PORT_DPB},
 659                 {DVO_PORT_HDMIC, DVO_PORT_DPC},
 660                 {DVO_PORT_HDMID, DVO_PORT_DPD},
 661                 {DVO_PORT_CRT, -1 /* Port E can only be DVO_PORT_CRT */ },
 662         };
 663
 664         /* Find the child device to use, abort if more than one found. */
 665         for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
 666                 it = dev_priv->vbt.child_dev + i;
 667
 668                 for (j = 0; j < 2; j++) {
 669                         if (dvo_ports[port][j] == -1)
 670                                 break;
 671
 672                         if (it->common.dvo_port == dvo_ports[port][j]) {
 673                                 if (child) {
 674                                         DRM_DEBUG_KMS("More than one child device for port %c in VBT.\n",
 675                                                       port_name(port));
 676                                         return;
 677                                 }
 678                                 child = it;
 679                         }
 680                 }
 681         }
 682         if (!child)
 683                 return;
 684
 685         aux_channel = child->raw[25];
 686
 687         is_dvi = child->common.device_type & DEVICE_TYPE_TMDS_DVI_SIGNALING;
 688         is_dp = child->common.device_type & DEVICE_TYPE_DISPLAYPORT_OUTPUT;
 689         is_crt = child->common.device_type & DEVICE_TYPE_ANALOG_OUTPUT;
 690         is_hdmi = is_dvi && (child->common.device_type & DEVICE_TYPE_NOT_HDMI_OUTPUT) == 0;
 691         is_edp = is_dp && (child->common.device_type & DEVICE_TYPE_INTERNAL_CONNECTOR);
 692
 693         info->supports_dvi = is_dvi;
 694         info->supports_hdmi = is_hdmi;
 695         info->supports_dp = is_dp;
 696
 697         DRM_DEBUG_KMS("Port %c VBT info: DP:%d HDMI:%d DVI:%d EDP:%d CRT:%d\n",
 698                       port_name(port), is_dp, is_hdmi, is_dvi, is_edp, is_crt);
 699
 700         if (is_edp && is_dvi)
 701                 DRM_DEBUG_KMS("Internal DP port %c is TMDS compatible\n",
 702                               port_name(port));
 703         if (is_crt && port != PORT_E)
 704                 DRM_DEBUG_KMS("Port %c is analog\n", port_name(port));
 705         if (is_crt && (is_dvi || is_dp))
 706                 DRM_DEBUG_KMS("Analog port %c is also DP or TMDS compatible\n",
 707                               port_name(port));
 708         if (is_dvi && (port == PORT_A || port == PORT_E))
 709                 DRM_DEBUG_KMS("Port %c is TMDS compabile\n", port_name(port));
 710         if (!is_dvi && !is_dp && !is_crt)
 711                 DRM_DEBUG_KMS("Port %c is not DP/TMDS/CRT compatible\n",
 712                               port_name(port));
 713         if (is_edp && (port == PORT_B || port == PORT_C || port == PORT_E))
 714                 DRM_DEBUG_KMS("Port %c is internal DP\n", port_name(port));
 715
 716         if (is_dvi) {
 717                 if (child->common.ddc_pin == 0x05 && port != PORT_B)
 718                         DRM_DEBUG_KMS("Unexpected DDC pin for port B\n");
 719                 if (child->common.ddc_pin == 0x04 && port != PORT_C)
 720                         DRM_DEBUG_KMS("Unexpected DDC pin for port C\n");
 721                 if (child->common.ddc_pin == 0x06 && port != PORT_D)
 722                         DRM_DEBUG_KMS("Unexpected DDC pin for port D\n");
 723         }
 724
 725         if (is_dp) {
 726                 if (aux_channel == 0x40 && port != PORT_A)
 727                         DRM_DEBUG_KMS("Unexpected AUX channel for port A\n");
 728                 if (aux_channel == 0x10 && port != PORT_B)
 729                         DRM_DEBUG_KMS("Unexpected AUX channel for port B\n");
 730                 if (aux_channel == 0x20 && port != PORT_C)
 731                         DRM_DEBUG_KMS("Unexpected AUX channel for port C\n");
 732                 if (aux_channel == 0x30 && port != PORT_D)
 733                         DRM_DEBUG_KMS("Unexpected AUX channel for port D\n");
 734         }
 735
 736         if (bdb->version >= 158) {
 737                 /* The VBT HDMI level shift values match the table we have. */
 738                 hdmi_level_shift = child->raw[7] & 0xF;
 739                 if (hdmi_level_shift < 0xC) {
 740                         DRM_DEBUG_KMS("VBT HDMI level shift for port %c: %d\n",
 741                                       port_name(port),
 742                                       hdmi_level_shift);
 743                         info->hdmi_level_shift = hdmi_level_shift;
 744                 }
 745         }
 746 }
 747
 748 static void parse_ddi_ports(struct drm_i915_private *dev_priv,
 749                             struct bdb_header *bdb)
 750 {
 751         struct drm_device *dev = dev_priv->dev;
 752         enum port port;
 753
 754         if (!HAS_DDI(dev))
 755                 return;
 756
 757         if (!dev_priv->vbt.child_dev_num)
 758                 return;
 759
 760         if (bdb->version < 155)
 761                 return;
 762
 763         for (port = PORT_A; port < I915_MAX_PORTS; port++)
 764                 parse_ddi_port(dev_priv, port, bdb);
 765 }
 766
 767 static void
 768 parse_device_mapping(struct drm_i915_private *dev_priv,
 769                        struct bdb_header *bdb)
 770 {
 771         struct bdb_general_definitions *p_defs;
 772         union child_device_config *p_child, *child_dev_ptr;
 773         int i, child_device_num, count;
 774         u16     block_size;
 775
 776         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 777         if (!p_defs) {
 778                 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
 779                 return;
 780         }
 781         /* judge whether the size of child device meets the requirements.
 782          * If the child device size obtained from general definition block
 783          * is different with sizeof(struct child_device_config), skip the
 784          * parsing of sdvo device info
 785          */
 786         if (p_defs->child_dev_size != sizeof(*p_child)) {
 787                 /* different child dev size . Ignore it */
 788                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 789                 return;
 790         }
 791         /* get the block size of general definitions */
 792         block_size = get_blocksize(p_defs);
 793         /* get the number of child device */
 794         child_device_num = (block_size - sizeof(*p_defs)) /
 795                                 sizeof(*p_child);
 796         count = 0;
 797         /* get the number of child device that is present */
 798         for (i = 0; i < child_device_num; i++) {
 799                 p_child = &(p_defs->devices[i]);
 800                 if (!p_child->common.device_type) {
 801                         /* skip the device block if device type is invalid */
 802                         continue;
 803                 }
 804                 count++;
 805         }
 806         if (!count) {
 807                 DRM_DEBUG_KMS("no child dev is parsed from VBT\n");
 808                 return;
 809         }
 810         dev_priv->vbt.child_dev = kcalloc(count, sizeof(*p_child), GFP_KERNEL);
 811         if (!dev_priv->vbt.child_dev) {
 812                 DRM_DEBUG_KMS("No memory space for child device\n");
 813                 return;
 814         }
 815
 816         dev_priv->vbt.child_dev_num = count;
 817         count = 0;
 818         for (i = 0; i < child_device_num; i++) {
 819                 p_child = &(p_defs->devices[i]);
 820                 if (!p_child->common.device_type) {
 821                         /* skip the device block if device type is invalid */
 822                         continue;
 823                 }
 824                 child_dev_ptr = dev_priv->vbt.child_dev + count;
 825                 count++;
 826                 memcpy((void *)child_dev_ptr, (void *)p_child,
 827                                         sizeof(*p_child));
 828         }
 829         return;
 830 }
 831
 832 static void
 833 init_vbt_defaults(struct drm_i915_private *dev_priv)
 834 {
 835         struct drm_device *dev = dev_priv->dev;
 836         enum port port;
 837
 838         dev_priv->vbt.crt_ddc_pin = GMBUS_PORT_VGADDC;
 839
 840         /* LFP panel data */
 841         dev_priv->vbt.lvds_dither = 1;
 842         dev_priv->vbt.lvds_vbt = 0;
 843
 844         /* SDVO panel data */
 845         dev_priv->vbt.sdvo_lvds_vbt_mode = NULL;
 846
 847         /* general features */
 848         dev_priv->vbt.int_tv_support = 1;
 849         dev_priv->vbt.int_crt_support = 1;
 850
 851         /* Default to using SSC */
 852         dev_priv->vbt.lvds_use_ssc = 1;
 853         /*
 854          * Core/SandyBridge/IvyBridge use alternative (120MHz) reference
 855          * clock for LVDS.
 856          */
 857         dev_priv->vbt.lvds_ssc_freq = intel_bios_ssc_frequency(dev,
 858                         !HAS_PCH_SPLIT(dev));
 859         DRM_DEBUG_KMS("Set default to SSC at %d kHz\n", dev_priv->vbt.lvds_ssc_freq);
 860
 861         for (port = PORT_A; port < I915_MAX_PORTS; port++) {
 862                 struct ddi_vbt_port_info *info =
 863                         &dev_priv->vbt.ddi_port_info[port];
 864
 865                 /* Recommended BSpec default: 800mV 0dB. */
 866                 info->hdmi_level_shift = 6;
 867
 868                 info->supports_dvi = (port != PORT_A && port != PORT_E);
 869                 info->supports_hdmi = info->supports_dvi;
 870                 info->supports_dp = (port != PORT_E);
 871         }
 872 }
 873
 874 static int __init intel_no_opregion_vbt_callback(const struct dmi_system_id *id)
 875 {
 876         DRM_DEBUG_KMS("Falling back to manually reading VBT from "
 877                       "VBIOS ROM for %s\n",
 878                       id->ident);
 879         return 1;
 880 }
 881
 882 static const struct dmi_system_id intel_no_opregion_vbt[] = {
 883         {
 884                 .callback = intel_no_opregion_vbt_callback,
 885                 .ident = "ThinkCentre A57",
 886                 .matches = {
 887                         DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 888                         DMI_MATCH(DMI_PRODUCT_NAME, "97027RG"),
 889                 },
 890         },
 891         { }
 892 };
 893
 894 /**
 895  * intel_parse_bios - find VBT and initialize settings from the BIOS
 896  * @dev: DRM device
 897  *
 898  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
 899  * to appropriate values.
 900  *
 901  * Returns 0 on success, nonzero on failure.
 902  */
 903 int
 904 intel_parse_bios(struct drm_device *dev)
 905 {
 906         struct drm_i915_private *dev_priv = dev->dev_private;
 907         struct pci_dev *pdev = dev->pdev;
 908         struct bdb_header *bdb = NULL;
 909         u8 __iomem *bios = NULL;
 910
 911         if (HAS_PCH_NOP(dev))
 912                 return -ENODEV;
 913
 914         init_vbt_defaults(dev_priv);
 915
 916         /* XXX Should this validation be moved to intel_opregion.c? */
 917         if (!dmi_check_system(intel_no_opregion_vbt) && dev_priv->opregion.vbt) {
 918                 struct vbt_header *vbt = dev_priv->opregion.vbt;
 919                 if (memcmp(vbt->signature, "$VBT", 4) == 0) {
 920                         DRM_DEBUG_KMS("Using VBT from OpRegion: %20s\n",
 921                                          vbt->signature);
 922                         bdb = (struct bdb_header *)((char *)vbt + vbt->bdb_offset);
 923                 } else
 924                         dev_priv->opregion.vbt = NULL;
 925         }
 926
 927         if (bdb == NULL) {
 928                 struct vbt_header *vbt = NULL;
 929                 size_t size;
 930                 int i;
 931
 932                 bios = pci_map_rom(pdev, &size);
 933                 if (!bios)
 934                         return -1;
 935
 936                 /* Scour memory looking for the VBT signature */
 937                 for (i = 0; i + 4 < size; i++) {
 938                         if (!memcmp(bios + i, "$VBT", 4)) {
 939                                 vbt = (struct vbt_header *)(bios + i);
 940                                 break;
 941                         }
 942                 }
 943
 944                 if (!vbt) {
 945                         DRM_DEBUG_DRIVER("VBT signature missing\n");
 946                         pci_unmap_rom(pdev, bios);
 947                         return -1;
 948                 }
 949
 950                 bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
 951         }
 952
 953         /* Grab useful general definitions */
 954         parse_general_features(dev_priv, bdb);
 955         parse_general_definitions(dev_priv, bdb);
 956         parse_lfp_panel_data(dev_priv, bdb);
 957         parse_lfp_backlight(dev_priv, bdb);
 958         parse_sdvo_panel_data(dev_priv, bdb);
 959         parse_sdvo_device_mapping(dev_priv, bdb);
 960         parse_device_mapping(dev_priv, bdb);
 961         parse_driver_features(dev_priv, bdb);
 962         parse_edp(dev_priv, bdb);
 963         parse_mipi(dev_priv, bdb);
 964         parse_ddi_ports(dev_priv, bdb);
 965
 966         if (bios)
 967                 pci_unmap_rom(pdev, bios);
 968
 969         return 0;
 970 }
 971
 972 /* Ensure that vital registers have been initialised, even if the BIOS
 973  * is absent or just failing to do its job.
 974  */
 975 void intel_setup_bios(struct drm_device *dev)
 976 {
 977         struct drm_i915_private *dev_priv = dev->dev_private;
 978
 979          /* Set the Panel Power On/Off timings if uninitialized. */
 980         if (!HAS_PCH_SPLIT(dev) &&
 981             I915_READ(PP_ON_DELAYS) == 0 && I915_READ(PP_OFF_DELAYS) == 0) {
 982                 /* Set T2 to 40ms and T5 to 200ms */
 983                 I915_WRITE(PP_ON_DELAYS, 0x019007d0);
 984
 985                 /* Set T3 to 35ms and Tx to 200ms */
 986                 I915_WRITE(PP_OFF_DELAYS, 0x015e07d0);
 987         }
 988 }