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         /* Err to enabling backlight if no backlight block. */
 291         dev_priv->vbt.backlight.present = true;
 292
 293         backlight_data = find_section(bdb, BDB_LVDS_BACKLIGHT);
 294         if (!backlight_data)
 295                 return;
 296
 297         if (backlight_data->entry_size != sizeof(backlight_data->data[0])) {
 298                 DRM_DEBUG_KMS("Unsupported backlight data entry size %u\n",
 299                               backlight_data->entry_size);
 300                 return;
 301         }
 302
 303         entry = &backlight_data->data[panel_type];
 304
 305         dev_priv->vbt.backlight.present = entry->type == BDB_BACKLIGHT_TYPE_PWM;
 306         if (!dev_priv->vbt.backlight.present) {
 307                 DRM_DEBUG_KMS("PWM backlight not present in VBT (type %u)\n",
 308                               entry->type);
 309                 return;
 310         }
 311
 312         dev_priv->vbt.backlight.pwm_freq_hz = entry->pwm_freq_hz;
 313         dev_priv->vbt.backlight.active_low_pwm = entry->active_low_pwm;
 314         DRM_DEBUG_KMS("VBT backlight PWM modulation frequency %u Hz, "
 315                       "active %s, min brightness %u, level %u\n",
 316                       dev_priv->vbt.backlight.pwm_freq_hz,
 317                       dev_priv->vbt.backlight.active_low_pwm ? "low" : "high",
 318                       entry->min_brightness,
 319                       backlight_data->level[panel_type]);
 320 }
 321
 322 /* Try to find sdvo panel data */
 323 static void
 324 parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
 325                       struct bdb_header *bdb)
 326 {
 327         struct lvds_dvo_timing *dvo_timing;
 328         struct drm_display_mode *panel_fixed_mode;
 329         int index;
 330
 331         index = i915.vbt_sdvo_panel_type;
 332         if (index == -2) {
 333                 DRM_DEBUG_KMS("Ignore SDVO panel mode from BIOS VBT tables.\n");
 334                 return;
 335         }
 336
 337         if (index == -1) {
 338                 struct bdb_sdvo_lvds_options *sdvo_lvds_options;
 339
 340                 sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
 341                 if (!sdvo_lvds_options)
 342                         return;
 343
 344                 index = sdvo_lvds_options->panel_type;
 345         }
 346
 347         dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
 348         if (!dvo_timing)
 349                 return;
 350
 351         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 352         if (!panel_fixed_mode)
 353                 return;
 354
 355         fill_detail_timing_data(panel_fixed_mode, dvo_timing + index);
 356
 357         dev_priv->vbt.sdvo_lvds_vbt_mode = panel_fixed_mode;
 358
 359         DRM_DEBUG_KMS("Found SDVO panel mode in BIOS VBT tables:\n");
 360         drm_mode_debug_printmodeline(panel_fixed_mode);
 361 }
 362
 363 static int intel_bios_ssc_frequency(struct drm_device *dev,
 364                                     bool alternate)
 365 {
 366         switch (INTEL_INFO(dev)->gen) {
 367         case 2:
 368                 return alternate ? 66667 : 48000;
 369         case 3:
 370         case 4:
 371                 return alternate ? 100000 : 96000;
 372         default:
 373                 return alternate ? 100000 : 120000;
 374         }
 375 }
 376
 377 static void
 378 parse_general_features(struct drm_i915_private *dev_priv,
 379                        struct bdb_header *bdb)
 380 {
 381         struct drm_device *dev = dev_priv->dev;
 382         struct bdb_general_features *general;
 383
 384         general = find_section(bdb, BDB_GENERAL_FEATURES);
 385         if (general) {
 386                 dev_priv->vbt.int_tv_support = general->int_tv_support;
 387                 dev_priv->vbt.int_crt_support = general->int_crt_support;
 388                 dev_priv->vbt.lvds_use_ssc = general->enable_ssc;
 389                 dev_priv->vbt.lvds_ssc_freq =
 390                         intel_bios_ssc_frequency(dev, general->ssc_freq);
 391                 dev_priv->vbt.display_clock_mode = general->display_clock_mode;
 392                 dev_priv->vbt.fdi_rx_polarity_inverted = general->fdi_rx_polarity_inverted;
 393                 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",
 394                               dev_priv->vbt.int_tv_support,
 395                               dev_priv->vbt.int_crt_support,
 396                               dev_priv->vbt.lvds_use_ssc,
 397                               dev_priv->vbt.lvds_ssc_freq,
 398                               dev_priv->vbt.display_clock_mode,
 399                               dev_priv->vbt.fdi_rx_polarity_inverted);
 400         }
 401 }
 402
 403 static void
 404 parse_general_definitions(struct drm_i915_private *dev_priv,
 405                           struct bdb_header *bdb)
 406 {
 407         struct bdb_general_definitions *general;
 408
 409         general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 410         if (general) {
 411                 u16 block_size = get_blocksize(general);
 412                 if (block_size >= sizeof(*general)) {
 413                         int bus_pin = general->crt_ddc_gmbus_pin;
 414                         DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
 415                         if (intel_gmbus_is_port_valid(bus_pin))
 416                                 dev_priv->vbt.crt_ddc_pin = bus_pin;
 417                 } else {
 418                         DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
 419                                       block_size);
 420                 }
 421         }
 422 }
 423
 424 static void
 425 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
 426                           struct bdb_header *bdb)
 427 {
 428         struct sdvo_device_mapping *p_mapping;
 429         struct bdb_general_definitions *p_defs;
 430         union child_device_config *p_child;
 431         int i, child_device_num, count;
 432         u16     block_size;
 433
 434         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 435         if (!p_defs) {
 436                 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
 437                 return;
 438         }
 439         /* judge whether the size of child device meets the requirements.
 440          * If the child device size obtained from general definition block
 441          * is different with sizeof(struct child_device_config), skip the
 442          * parsing of sdvo device info
 443          */
 444         if (p_defs->child_dev_size != sizeof(*p_child)) {
 445                 /* different child dev size . Ignore it */
 446                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 447                 return;
 448         }
 449         /* get the block size of general definitions */
 450         block_size = get_blocksize(p_defs);
 451         /* get the number of child device */
 452         child_device_num = (block_size - sizeof(*p_defs)) /
 453                                 sizeof(*p_child);
 454         count = 0;
 455         for (i = 0; i < child_device_num; i++) {
 456                 p_child = &(p_defs->devices[i]);
 457                 if (!p_child->old.device_type) {
 458                         /* skip the device block if device type is invalid */
 459                         continue;
 460                 }
 461                 if (p_child->old.slave_addr != SLAVE_ADDR1 &&
 462                         p_child->old.slave_addr != SLAVE_ADDR2) {
 463                         /*
 464                          * If the slave address is neither 0x70 nor 0x72,
 465                          * it is not a SDVO device. Skip it.
 466                          */
 467                         continue;
 468                 }
 469                 if (p_child->old.dvo_port != DEVICE_PORT_DVOB &&
 470                         p_child->old.dvo_port != DEVICE_PORT_DVOC) {
 471                         /* skip the incorrect SDVO port */
 472                         DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n");
 473                         continue;
 474                 }
 475                 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
 476                                 " %s port\n",
 477                                 p_child->old.slave_addr,
 478                                 (p_child->old.dvo_port == DEVICE_PORT_DVOB) ?
 479                                         "SDVOB" : "SDVOC");
 480                 p_mapping = &(dev_priv->sdvo_mappings[p_child->old.dvo_port - 1]);
 481                 if (!p_mapping->initialized) {
 482                         p_mapping->dvo_port = p_child->old.dvo_port;
 483                         p_mapping->slave_addr = p_child->old.slave_addr;
 484                         p_mapping->dvo_wiring = p_child->old.dvo_wiring;
 485                         p_mapping->ddc_pin = p_child->old.ddc_pin;
 486                         p_mapping->i2c_pin = p_child->old.i2c_pin;
 487                         p_mapping->initialized = 1;
 488                         DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n",
 489                                       p_mapping->dvo_port,
 490                                       p_mapping->slave_addr,
 491                                       p_mapping->dvo_wiring,
 492                                       p_mapping->ddc_pin,
 493                                       p_mapping->i2c_pin);
 494                 } else {
 495                         DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
 496                                          "two SDVO device.\n");
 497                 }
 498                 if (p_child->old.slave2_addr) {
 499                         /* Maybe this is a SDVO device with multiple inputs */
 500                         /* And the mapping info is not added */
 501                         DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
 502                                 " is a SDVO device with multiple inputs.\n");
 503                 }
 504                 count++;
 505         }
 506
 507         if (!count) {
 508                 /* No SDVO device info is found */
 509                 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
 510         }
 511         return;
 512 }
 513
 514 static void
 515 parse_driver_features(struct drm_i915_private *dev_priv,
 516                        struct bdb_header *bdb)
 517 {
 518         struct bdb_driver_features *driver;
 519
 520         driver = find_section(bdb, BDB_DRIVER_FEATURES);
 521         if (!driver)
 522                 return;
 523
 524         if (driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
 525                 dev_priv->vbt.edp_support = 1;
 526
 527         if (driver->dual_frequency)
 528                 dev_priv->render_reclock_avail = true;
 529 }
 530
 531 static void
 532 parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
 533 {
 534         struct bdb_edp *edp;
 535         struct edp_power_seq *edp_pps;
 536         struct edp_link_params *edp_link_params;
 537
 538         edp = find_section(bdb, BDB_EDP);
 539         if (!edp) {
 540                 if (dev_priv->vbt.edp_support)
 541                         DRM_DEBUG_KMS("No eDP BDB found but eDP panel supported.\n");
 542                 return;
 543         }
 544
 545         switch ((edp->color_depth >> (panel_type * 2)) & 3) {
 546         case EDP_18BPP:
 547                 dev_priv->vbt.edp_bpp = 18;
 548                 break;
 549         case EDP_24BPP:
 550                 dev_priv->vbt.edp_bpp = 24;
 551                 break;
 552         case EDP_30BPP:
 553                 dev_priv->vbt.edp_bpp = 30;
 554                 break;
 555         }
 556
 557         /* Get the eDP sequencing and link info */
 558         edp_pps = &edp->power_seqs[panel_type];
 559         edp_link_params = &edp->link_params[panel_type];
 560
 561         dev_priv->vbt.edp_pps = *edp_pps;
 562
 563         switch (edp_link_params->rate) {
 564         case EDP_RATE_1_62:
 565                 dev_priv->vbt.edp_rate = DP_LINK_BW_1_62;
 566                 break;
 567         case EDP_RATE_2_7:
 568                 dev_priv->vbt.edp_rate = DP_LINK_BW_2_7;
 569                 break;
 570         default:
 571                 DRM_DEBUG_KMS("VBT has unknown eDP link rate value %u\n",
 572                               edp_link_params->rate);
 573                 break;
 574         }
 575
 576         switch (edp_link_params->lanes) {
 577         case EDP_LANE_1:
 578                 dev_priv->vbt.edp_lanes = 1;
 579                 break;
 580         case EDP_LANE_2:
 581                 dev_priv->vbt.edp_lanes = 2;
 582                 break;
 583         case EDP_LANE_4:
 584                 dev_priv->vbt.edp_lanes = 4;
 585                 break;
 586         default:
 587                 DRM_DEBUG_KMS("VBT has unknown eDP lane count value %u\n",
 588                               edp_link_params->lanes);
 589                 break;
 590         }
 591
 592         switch (edp_link_params->preemphasis) {
 593         case EDP_PREEMPHASIS_NONE:
 594                 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_0;
 595                 break;
 596         case EDP_PREEMPHASIS_3_5dB:
 597                 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_3_5;
 598                 break;
 599         case EDP_PREEMPHASIS_6dB:
 600                 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_6;
 601                 break;
 602         case EDP_PREEMPHASIS_9_5dB:
 603                 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_9_5;
 604                 break;
 605         default:
 606                 DRM_DEBUG_KMS("VBT has unknown eDP pre-emphasis value %u\n",
 607                               edp_link_params->preemphasis);
 608                 break;
 609         }
 610
 611         switch (edp_link_params->vswing) {
 612         case EDP_VSWING_0_4V:
 613                 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_400;
 614                 break;
 615         case EDP_VSWING_0_6V:
 616                 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_600;
 617                 break;
 618         case EDP_VSWING_0_8V:
 619                 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_800;
 620                 break;
 621         case EDP_VSWING_1_2V:
 622                 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_1200;
 623                 break;
 624         default:
 625                 DRM_DEBUG_KMS("VBT has unknown eDP voltage swing value %u\n",
 626                               edp_link_params->vswing);
 627                 break;
 628         }
 629 }
 630
 631 static void
 632 parse_mipi(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
 633 {
 634         struct bdb_mipi *mipi;
 635
 636         mipi = find_section(bdb, BDB_MIPI_CONFIG);
 637         if (!mipi) {
 638                 DRM_DEBUG_KMS("No MIPI BDB found");
 639                 return;
 640         }
 641
 642         /* XXX: add more info */
 643         dev_priv->vbt.dsi.panel_id = MIPI_DSI_GENERIC_PANEL_ID;
 644 }
 645
 646 static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
 647                            struct bdb_header *bdb)
 648 {
 649         union child_device_config *it, *child = NULL;
 650         struct ddi_vbt_port_info *info = &dev_priv->vbt.ddi_port_info[port];
 651         uint8_t hdmi_level_shift;
 652         int i, j;
 653         bool is_dvi, is_hdmi, is_dp, is_edp, is_crt;
 654         uint8_t aux_channel;
 655         /* Each DDI port can have more than one value on the "DVO Port" field,
 656          * so look for all the possible values for each port and abort if more
 657          * than one is found. */
 658         int dvo_ports[][2] = {
 659                 {DVO_PORT_HDMIA, DVO_PORT_DPA},
 660                 {DVO_PORT_HDMIB, DVO_PORT_DPB},
 661                 {DVO_PORT_HDMIC, DVO_PORT_DPC},
 662                 {DVO_PORT_HDMID, DVO_PORT_DPD},
 663                 {DVO_PORT_CRT, -1 /* Port E can only be DVO_PORT_CRT */ },
 664         };
 665
 666         /* Find the child device to use, abort if more than one found. */
 667         for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
 668                 it = dev_priv->vbt.child_dev + i;
 669
 670                 for (j = 0; j < 2; j++) {
 671                         if (dvo_ports[port][j] == -1)
 672                                 break;
 673
 674                         if (it->common.dvo_port == dvo_ports[port][j]) {
 675                                 if (child) {
 676                                         DRM_DEBUG_KMS("More than one child device for port %c in VBT.\n",
 677                                                       port_name(port));
 678                                         return;
 679                                 }
 680                                 child = it;
 681                         }
 682                 }
 683         }
 684         if (!child)
 685                 return;
 686
 687         aux_channel = child->raw[25];
 688
 689         is_dvi = child->common.device_type & DEVICE_TYPE_TMDS_DVI_SIGNALING;
 690         is_dp = child->common.device_type & DEVICE_TYPE_DISPLAYPORT_OUTPUT;
 691         is_crt = child->common.device_type & DEVICE_TYPE_ANALOG_OUTPUT;
 692         is_hdmi = is_dvi && (child->common.device_type & DEVICE_TYPE_NOT_HDMI_OUTPUT) == 0;
 693         is_edp = is_dp && (child->common.device_type & DEVICE_TYPE_INTERNAL_CONNECTOR);
 694
 695         info->supports_dvi = is_dvi;
 696         info->supports_hdmi = is_hdmi;
 697         info->supports_dp = is_dp;
 698
 699         DRM_DEBUG_KMS("Port %c VBT info: DP:%d HDMI:%d DVI:%d EDP:%d CRT:%d\n",
 700                       port_name(port), is_dp, is_hdmi, is_dvi, is_edp, is_crt);
 701
 702         if (is_edp && is_dvi)
 703                 DRM_DEBUG_KMS("Internal DP port %c is TMDS compatible\n",
 704                               port_name(port));
 705         if (is_crt && port != PORT_E)
 706                 DRM_DEBUG_KMS("Port %c is analog\n", port_name(port));
 707         if (is_crt && (is_dvi || is_dp))
 708                 DRM_DEBUG_KMS("Analog port %c is also DP or TMDS compatible\n",
 709                               port_name(port));
 710         if (is_dvi && (port == PORT_A || port == PORT_E))
 711                 DRM_DEBUG_KMS("Port %c is TMDS compabile\n", port_name(port));
 712         if (!is_dvi && !is_dp && !is_crt)
 713                 DRM_DEBUG_KMS("Port %c is not DP/TMDS/CRT compatible\n",
 714                               port_name(port));
 715         if (is_edp && (port == PORT_B || port == PORT_C || port == PORT_E))
 716                 DRM_DEBUG_KMS("Port %c is internal DP\n", port_name(port));
 717
 718         if (is_dvi) {
 719                 if (child->common.ddc_pin == 0x05 && port != PORT_B)
 720                         DRM_DEBUG_KMS("Unexpected DDC pin for port B\n");
 721                 if (child->common.ddc_pin == 0x04 && port != PORT_C)
 722                         DRM_DEBUG_KMS("Unexpected DDC pin for port C\n");
 723                 if (child->common.ddc_pin == 0x06 && port != PORT_D)
 724                         DRM_DEBUG_KMS("Unexpected DDC pin for port D\n");
 725         }
 726
 727         if (is_dp) {
 728                 if (aux_channel == 0x40 && port != PORT_A)
 729                         DRM_DEBUG_KMS("Unexpected AUX channel for port A\n");
 730                 if (aux_channel == 0x10 && port != PORT_B)
 731                         DRM_DEBUG_KMS("Unexpected AUX channel for port B\n");
 732                 if (aux_channel == 0x20 && port != PORT_C)
 733                         DRM_DEBUG_KMS("Unexpected AUX channel for port C\n");
 734                 if (aux_channel == 0x30 && port != PORT_D)
 735                         DRM_DEBUG_KMS("Unexpected AUX channel for port D\n");
 736         }
 737
 738         if (bdb->version >= 158) {
 739                 /* The VBT HDMI level shift values match the table we have. */
 740                 hdmi_level_shift = child->raw[7] & 0xF;
 741                 if (hdmi_level_shift < 0xC) {
 742                         DRM_DEBUG_KMS("VBT HDMI level shift for port %c: %d\n",
 743                                       port_name(port),
 744                                       hdmi_level_shift);
 745                         info->hdmi_level_shift = hdmi_level_shift;
 746                 }
 747         }
 748 }
 749
 750 static void parse_ddi_ports(struct drm_i915_private *dev_priv,
 751                             struct bdb_header *bdb)
 752 {
 753         struct drm_device *dev = dev_priv->dev;
 754         enum port port;
 755
 756         if (!HAS_DDI(dev))
 757                 return;
 758
 759         if (!dev_priv->vbt.child_dev_num)
 760                 return;
 761
 762         if (bdb->version < 155)
 763                 return;
 764
 765         for (port = PORT_A; port < I915_MAX_PORTS; port++)
 766                 parse_ddi_port(dev_priv, port, bdb);
 767 }
 768
 769 static void
 770 parse_device_mapping(struct drm_i915_private *dev_priv,
 771                        struct bdb_header *bdb)
 772 {
 773         struct bdb_general_definitions *p_defs;
 774         union child_device_config *p_child, *child_dev_ptr;
 775         int i, child_device_num, count;
 776         u16     block_size;
 777
 778         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 779         if (!p_defs) {
 780                 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
 781                 return;
 782         }
 783         /* judge whether the size of child device meets the requirements.
 784          * If the child device size obtained from general definition block
 785          * is different with sizeof(struct child_device_config), skip the
 786          * parsing of sdvo device info
 787          */
 788         if (p_defs->child_dev_size != sizeof(*p_child)) {
 789                 /* different child dev size . Ignore it */
 790                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 791                 return;
 792         }
 793         /* get the block size of general definitions */
 794         block_size = get_blocksize(p_defs);
 795         /* get the number of child device */
 796         child_device_num = (block_size - sizeof(*p_defs)) /
 797                                 sizeof(*p_child);
 798         count = 0;
 799         /* get the number of child device that is present */
 800         for (i = 0; i < child_device_num; i++) {
 801                 p_child = &(p_defs->devices[i]);
 802                 if (!p_child->common.device_type) {
 803                         /* skip the device block if device type is invalid */
 804                         continue;
 805                 }
 806                 count++;
 807         }
 808         if (!count) {
 809                 DRM_DEBUG_KMS("no child dev is parsed from VBT\n");
 810                 return;
 811         }
 812         dev_priv->vbt.child_dev = kcalloc(count, sizeof(*p_child), GFP_KERNEL);
 813         if (!dev_priv->vbt.child_dev) {
 814                 DRM_DEBUG_KMS("No memory space for child device\n");
 815                 return;
 816         }
 817
 818         dev_priv->vbt.child_dev_num = count;
 819         count = 0;
 820         for (i = 0; i < child_device_num; i++) {
 821                 p_child = &(p_defs->devices[i]);
 822                 if (!p_child->common.device_type) {
 823                         /* skip the device block if device type is invalid */
 824                         continue;
 825                 }
 826                 child_dev_ptr = dev_priv->vbt.child_dev + count;
 827                 count++;
 828                 memcpy((void *)child_dev_ptr, (void *)p_child,
 829                                         sizeof(*p_child));
 830         }
 831         return;
 832 }
 833
 834 static void
 835 init_vbt_defaults(struct drm_i915_private *dev_priv)
 836 {
 837         struct drm_device *dev = dev_priv->dev;
 838         enum port port;
 839
 840         dev_priv->vbt.crt_ddc_pin = GMBUS_PORT_VGADDC;
 841
 842         /* LFP panel data */
 843         dev_priv->vbt.lvds_dither = 1;
 844         dev_priv->vbt.lvds_vbt = 0;
 845
 846         /* SDVO panel data */
 847         dev_priv->vbt.sdvo_lvds_vbt_mode = NULL;
 848
 849         /* general features */
 850         dev_priv->vbt.int_tv_support = 1;
 851         dev_priv->vbt.int_crt_support = 1;
 852
 853         /* Default to using SSC */
 854         dev_priv->vbt.lvds_use_ssc = 1;
 855         /*
 856          * Core/SandyBridge/IvyBridge use alternative (120MHz) reference
 857          * clock for LVDS.
 858          */
 859         dev_priv->vbt.lvds_ssc_freq = intel_bios_ssc_frequency(dev,
 860                         !HAS_PCH_SPLIT(dev));
 861         DRM_DEBUG_KMS("Set default to SSC at %d kHz\n", dev_priv->vbt.lvds_ssc_freq);
 862
 863         for (port = PORT_A; port < I915_MAX_PORTS; port++) {
 864                 struct ddi_vbt_port_info *info =
 865                         &dev_priv->vbt.ddi_port_info[port];
 866
 867                 /* Recommended BSpec default: 800mV 0dB. */
 868                 info->hdmi_level_shift = 6;
 869
 870                 info->supports_dvi = (port != PORT_A && port != PORT_E);
 871                 info->supports_hdmi = info->supports_dvi;
 872                 info->supports_dp = (port != PORT_E);
 873         }
 874 }
 875
 876 static int __init intel_no_opregion_vbt_callback(const struct dmi_system_id *id)
 877 {
 878         DRM_DEBUG_KMS("Falling back to manually reading VBT from "
 879                       "VBIOS ROM for %s\n",
 880                       id->ident);
 881         return 1;
 882 }
 883
 884 static const struct dmi_system_id intel_no_opregion_vbt[] = {
 885         {
 886                 .callback = intel_no_opregion_vbt_callback,
 887                 .ident = "ThinkCentre A57",
 888                 .matches = {
 889                         DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 890                         DMI_MATCH(DMI_PRODUCT_NAME, "97027RG"),
 891                 },
 892         },
 893         { }
 894 };
 895
 896 /**
 897  * intel_parse_bios - find VBT and initialize settings from the BIOS
 898  * @dev: DRM device
 899  *
 900  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
 901  * to appropriate values.
 902  *
 903  * Returns 0 on success, nonzero on failure.
 904  */
 905 int
 906 intel_parse_bios(struct drm_device *dev)
 907 {
 908         struct drm_i915_private *dev_priv = dev->dev_private;
 909         struct pci_dev *pdev = dev->pdev;
 910         struct bdb_header *bdb = NULL;
 911         u8 __iomem *bios = NULL;
 912
 913         if (HAS_PCH_NOP(dev))
 914                 return -ENODEV;
 915
 916         init_vbt_defaults(dev_priv);
 917
 918         /* XXX Should this validation be moved to intel_opregion.c? */
 919         if (!dmi_check_system(intel_no_opregion_vbt) && dev_priv->opregion.vbt) {
 920                 struct vbt_header *vbt = dev_priv->opregion.vbt;
 921                 if (memcmp(vbt->signature, "$VBT", 4) == 0) {
 922                         DRM_DEBUG_KMS("Using VBT from OpRegion: %20s\n",
 923                                          vbt->signature);
 924                         bdb = (struct bdb_header *)((char *)vbt + vbt->bdb_offset);
 925                 } else
 926                         dev_priv->opregion.vbt = NULL;
 927         }
 928
 929         if (bdb == NULL) {
 930                 struct vbt_header *vbt = NULL;
 931                 size_t size;
 932                 int i;
 933
 934                 bios = pci_map_rom(pdev, &size);
 935                 if (!bios)
 936                         return -1;
 937
 938                 /* Scour memory looking for the VBT signature */
 939                 for (i = 0; i + 4 < size; i++) {
 940                         if (!memcmp(bios + i, "$VBT", 4)) {
 941                                 vbt = (struct vbt_header *)(bios + i);
 942                                 break;
 943                         }
 944                 }
 945
 946                 if (!vbt) {
 947                         DRM_DEBUG_DRIVER("VBT signature missing\n");
 948                         pci_unmap_rom(pdev, bios);
 949                         return -1;
 950                 }
 951
 952                 bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
 953         }
 954
 955         /* Grab useful general definitions */
 956         parse_general_features(dev_priv, bdb);
 957         parse_general_definitions(dev_priv, bdb);
 958         parse_lfp_panel_data(dev_priv, bdb);
 959         parse_lfp_backlight(dev_priv, bdb);
 960         parse_sdvo_panel_data(dev_priv, bdb);
 961         parse_sdvo_device_mapping(dev_priv, bdb);
 962         parse_device_mapping(dev_priv, bdb);
 963         parse_driver_features(dev_priv, bdb);
 964         parse_edp(dev_priv, bdb);
 965         parse_mipi(dev_priv, bdb);
 966         parse_ddi_ports(dev_priv, bdb);
 967
 968         if (bios)
 969                 pci_unmap_rom(pdev, bios);
 970
 971         return 0;
 972 }
 973
 974 /* Ensure that vital registers have been initialised, even if the BIOS
 975  * is absent or just failing to do its job.
 976  */
 977 void intel_setup_bios(struct drm_device *dev)
 978 {
 979         struct drm_i915_private *dev_priv = dev->dev_private;
 980
 981          /* Set the Panel Power On/Off timings if uninitialized. */
 982         if (!HAS_PCH_SPLIT(dev) &&
 983             I915_READ(PP_ON_DELAYS) == 0 && I915_READ(PP_OFF_DELAYS) == 0) {
 984                 /* Set T2 to 40ms and T5 to 200ms */
 985                 I915_WRITE(PP_ON_DELAYS, 0x019007d0);
 986
 987                 /* Set T3 to 35ms and Tx to 200ms */
 988                 I915_WRITE(PP_OFF_DELAYS, 0x015e07d0);
 989         }
 990 }