sys/dev/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 <drm/drmP.h>
  28 #include <drm/drm_dp_helper.h>
  29 #include <drm/i915_drm.h>
  30 #include "i915_drv.h"
  31 #include "intel_bios.h"
  32
  33 #define SLAVE_ADDR1     0x70
  34 #define SLAVE_ADDR2     0x72
  35
  36 static int panel_type;
  37
  38 static void *
  39 find_section(struct bdb_header *bdb, int section_id)
  40 {
  41         u8 *base = (u8 *)bdb;
  42         int index = 0;
  43         u16 total, current_size;
  44         u8 current_id;
  45
  46         /* skip to first section */
  47         index += bdb->header_size;
  48         total = bdb->bdb_size;
  49
  50         /* walk the sections looking for section_id */
  51         while (index < total) {
  52                 current_id = *(base + index);
  53                 index++;
  54                 current_size = *((u16 *)(base + index));
  55                 index += 2;
  56                 if (current_id == section_id)
  57                         return base + index;
  58                 index += current_size;
  59         }
  60
  61         return NULL;
  62 }
  63
  64 static u16
  65 get_blocksize(void *p)
  66 {
  67         u16 *block_ptr, block_size;
  68
  69         block_ptr = (u16 *)((char *)p - 2);
  70         block_size = *block_ptr;
  71         return block_size;
  72 }
  73
  74 static void
  75 fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
  76                         const struct lvds_dvo_timing *dvo_timing)
  77 {
  78         panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
  79                 dvo_timing->hactive_lo;
  80         panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
  81                 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
  82         panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
  83                 dvo_timing->hsync_pulse_width;
  84         panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
  85                 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
  86
  87         panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
  88                 dvo_timing->vactive_lo;
  89         panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
  90                 dvo_timing->vsync_off;
  91         panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
  92                 dvo_timing->vsync_pulse_width;
  93         panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
  94                 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
  95         panel_fixed_mode->clock = dvo_timing->clock * 10;
  96         panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
  97
  98         if (dvo_timing->hsync_positive)
  99                 panel_fixed_mode->flags |= DRM_MODE_FLAG_PHSYNC;
 100         else
 101                 panel_fixed_mode->flags |= DRM_MODE_FLAG_NHSYNC;
 102
 103         if (dvo_timing->vsync_positive)
 104                 panel_fixed_mode->flags |= DRM_MODE_FLAG_PVSYNC;
 105         else
 106                 panel_fixed_mode->flags |= DRM_MODE_FLAG_NVSYNC;
 107
 108         /* Some VBTs have bogus h/vtotal values */
 109         if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
 110                 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
 111         if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
 112                 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
 113
 114         drm_mode_set_name(panel_fixed_mode);
 115 }
 116
 117 static bool
 118 lvds_dvo_timing_equal_size(const struct lvds_dvo_timing *a,
 119                            const struct lvds_dvo_timing *b)
 120 {
 121         if (a->hactive_hi != b->hactive_hi ||
 122             a->hactive_lo != b->hactive_lo)
 123                 return false;
 124
 125         if (a->hsync_off_hi != b->hsync_off_hi ||
 126             a->hsync_off_lo != b->hsync_off_lo)
 127                 return false;
 128
 129         if (a->hsync_pulse_width != b->hsync_pulse_width)
 130                 return false;
 131
 132         if (a->hblank_hi != b->hblank_hi ||
 133             a->hblank_lo != b->hblank_lo)
 134                 return false;
 135
 136         if (a->vactive_hi != b->vactive_hi ||
 137             a->vactive_lo != b->vactive_lo)
 138                 return false;
 139
 140         if (a->vsync_off != b->vsync_off)
 141                 return false;
 142
 143         if (a->vsync_pulse_width != b->vsync_pulse_width)
 144                 return false;
 145
 146         if (a->vblank_hi != b->vblank_hi ||
 147             a->vblank_lo != b->vblank_lo)
 148                 return false;
 149
 150         return true;
 151 }
 152
 153 static const struct lvds_dvo_timing *
 154 get_lvds_dvo_timing(const struct bdb_lvds_lfp_data *lvds_lfp_data,
 155                     const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs,
 156                     int index)
 157 {
 158         /*
 159          * the size of fp_timing varies on the different platform.
 160          * So calculate the DVO timing relative offset in LVDS data
 161          * entry to get the DVO timing entry
 162          */
 163
 164         int lfp_data_size =
 165                 lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
 166                 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
 167         int dvo_timing_offset =
 168                 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset -
 169                 lvds_lfp_data_ptrs->ptr[0].fp_timing_offset;
 170         const char *entry = (const char *)lvds_lfp_data->data + lfp_data_size * index;
 171
 172         return (const struct lvds_dvo_timing *)(entry + dvo_timing_offset);
 173 }
 174
 175 /* get lvds_fp_timing entry
 176  * this function may return NULL if the corresponding entry is invalid
 177  */
 178 static const struct lvds_fp_timing *
 179 get_lvds_fp_timing(const struct bdb_header *bdb,
 180                    const struct bdb_lvds_lfp_data *data,
 181                    const struct bdb_lvds_lfp_data_ptrs *ptrs,
 182                    int index)
 183 {
 184         size_t data_ofs = (const u8 *)data - (const u8 *)bdb;
 185         u16 data_size = ((const u16 *)data)[-1]; /* stored in header */
 186         size_t ofs;
 187
 188         if (index >= ARRAY_SIZE(ptrs->ptr))
 189                 return NULL;
 190         ofs = ptrs->ptr[index].fp_timing_offset;
 191         if (ofs < data_ofs ||
 192             ofs + sizeof(struct lvds_fp_timing) > data_ofs + data_size)
 193                 return NULL;
 194         return (const struct lvds_fp_timing *)((const u8 *)bdb + ofs);
 195 }
 196
 197 /* Try to find integrated panel data */
 198 static void
 199 parse_lfp_panel_data(struct drm_i915_private *dev_priv,
 200                             struct bdb_header *bdb)
 201 {
 202         const struct bdb_lvds_options *lvds_options;
 203         const struct bdb_lvds_lfp_data *lvds_lfp_data;
 204         const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
 205         const struct lvds_dvo_timing *panel_dvo_timing;
 206         const struct lvds_fp_timing *fp_timing;
 207         struct drm_display_mode *panel_fixed_mode;
 208         int i, downclock;
 209
 210         lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
 211         if (!lvds_options)
 212                 return;
 213
 214         dev_priv->vbt.lvds_dither = lvds_options->pixel_dither;
 215         if (lvds_options->panel_type == 0xff)
 216                 return;
 217
 218         panel_type = lvds_options->panel_type;
 219
 220         lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
 221         if (!lvds_lfp_data)
 222                 return;
 223
 224         lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
 225         if (!lvds_lfp_data_ptrs)
 226                 return;
 227
 228         dev_priv->vbt.lvds_vbt = 1;
 229
 230         panel_dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
 231                                                lvds_lfp_data_ptrs,
 232                                                lvds_options->panel_type);
 233
 234         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 235         if (!panel_fixed_mode)
 236                 return;
 237
 238         fill_detail_timing_data(panel_fixed_mode, panel_dvo_timing);
 239
 240         dev_priv->vbt.lfp_lvds_vbt_mode = panel_fixed_mode;
 241
 242         DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n");
 243         drm_mode_debug_printmodeline(panel_fixed_mode);
 244
 245         /*
 246          * Iterate over the LVDS panel timing info to find the lowest clock
 247          * for the native resolution.
 248          */
 249         downclock = panel_dvo_timing->clock;
 250         for (i = 0; i < 16; i++) {
 251                 const struct lvds_dvo_timing *dvo_timing;
 252
 253                 dvo_timing = get_lvds_dvo_timing(lvds_lfp_data,
 254                                                  lvds_lfp_data_ptrs,
 255                                                  i);
 256                 if (lvds_dvo_timing_equal_size(dvo_timing, panel_dvo_timing) &&
 257                     dvo_timing->clock < downclock)
 258                         downclock = dvo_timing->clock;
 259         }
 260
 261         if (downclock < panel_dvo_timing->clock && i915_lvds_downclock) {
 262                 dev_priv->lvds_downclock_avail = 1;
 263                 dev_priv->lvds_downclock = downclock * 10;
 264                 DRM_DEBUG_KMS("LVDS downclock is found in VBT. "
 265                               "Normal Clock %dKHz, downclock %dKHz\n",
 266                               panel_fixed_mode->clock, 10*downclock);
 267         }
 268
 269         fp_timing = get_lvds_fp_timing(bdb, lvds_lfp_data,
 270                                        lvds_lfp_data_ptrs,
 271                                        lvds_options->panel_type);
 272         if (fp_timing) {
 273                 /* check the resolution, just to be sure */
 274                 if (fp_timing->x_res == panel_fixed_mode->hdisplay &&
 275                     fp_timing->y_res == panel_fixed_mode->vdisplay) {
 276                         dev_priv->vbt.bios_lvds_val = fp_timing->lvds_reg_val;
 277                         DRM_DEBUG_KMS("VBT initial LVDS value %x\n",
 278                                       dev_priv->vbt.bios_lvds_val);
 279                 }
 280         }
 281 }
 282
 283 static void
 284 parse_lfp_backlight(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
 285 {
 286         const struct bdb_lfp_backlight_data *backlight_data;
 287         const struct bdb_lfp_backlight_data_entry *entry;
 288
 289         backlight_data = find_section(bdb, BDB_LVDS_BACKLIGHT);
 290         if (!backlight_data)
 291                 return;
 292
 293         if (backlight_data->entry_size != sizeof(backlight_data->data[0])) {
 294                 DRM_DEBUG_KMS("Unsupported backlight data entry size %u\n",
 295                               backlight_data->entry_size);
 296                 return;
 297         }
 298
 299         entry = &backlight_data->data[panel_type];
 300
 301         dev_priv->vbt.backlight.pwm_freq_hz = entry->pwm_freq_hz;
 302         dev_priv->vbt.backlight.active_low_pwm = entry->active_low_pwm;
 303         DRM_DEBUG_KMS("VBT backlight PWM modulation frequency %u Hz, "
 304                       "active %s, min brightness %u, level %u\n",
 305                       dev_priv->vbt.backlight.pwm_freq_hz,
 306                       dev_priv->vbt.backlight.active_low_pwm ? "low" : "high",
 307                       entry->min_brightness,
 308                       backlight_data->level[panel_type]);
 309 }
 310
 311 /* Try to find sdvo panel data */
 312 static void
 313 parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
 314                       struct bdb_header *bdb)
 315 {
 316         struct lvds_dvo_timing *dvo_timing;
 317         struct drm_display_mode *panel_fixed_mode;
 318         int index;
 319
 320         index = i915_vbt_sdvo_panel_type;
 321         if (index == -2) {
 322                 DRM_DEBUG_KMS("Ignore SDVO panel mode from BIOS VBT tables.\n");
 323                 return;
 324         }
 325
 326         if (index == -1) {
 327                 struct bdb_sdvo_lvds_options *sdvo_lvds_options;
 328
 329                 sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
 330                 if (!sdvo_lvds_options)
 331                         return;
 332
 333                 index = sdvo_lvds_options->panel_type;
 334         }
 335
 336         dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
 337         if (!dvo_timing)
 338                 return;
 339
 340         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 341         if (!panel_fixed_mode)
 342                 return;
 343
 344         fill_detail_timing_data(panel_fixed_mode, dvo_timing + index);
 345
 346         dev_priv->vbt.sdvo_lvds_vbt_mode = panel_fixed_mode;
 347
 348         DRM_DEBUG_KMS("Found SDVO panel mode in BIOS VBT tables:\n");
 349         drm_mode_debug_printmodeline(panel_fixed_mode);
 350 }
 351
 352 static int intel_bios_ssc_frequency(struct drm_device *dev,
 353                                     bool alternate)
 354 {
 355         switch (INTEL_INFO(dev)->gen) {
 356         case 2:
 357                 return alternate ? 66667 : 48000;
 358         case 3:
 359         case 4:
 360                 return alternate ? 100000 : 96000;
 361         default:
 362                 return alternate ? 100000 : 120000;
 363         }
 364 }
 365
 366 static void
 367 parse_general_features(struct drm_i915_private *dev_priv,
 368                        struct bdb_header *bdb)
 369 {
 370         struct drm_device *dev = dev_priv->dev;
 371         struct bdb_general_features *general;
 372
 373         general = find_section(bdb, BDB_GENERAL_FEATURES);
 374         if (general) {
 375                 dev_priv->vbt.int_tv_support = general->int_tv_support;
 376                 dev_priv->vbt.int_crt_support = general->int_crt_support;
 377                 dev_priv->vbt.lvds_use_ssc = general->enable_ssc;
 378                 dev_priv->vbt.lvds_ssc_freq =
 379                         intel_bios_ssc_frequency(dev, general->ssc_freq);
 380                 dev_priv->vbt.display_clock_mode = general->display_clock_mode;
 381                 dev_priv->vbt.fdi_rx_polarity_inverted = general->fdi_rx_polarity_inverted;
 382                 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",
 383                               dev_priv->vbt.int_tv_support,
 384                               dev_priv->vbt.int_crt_support,
 385                               dev_priv->vbt.lvds_use_ssc,
 386                               dev_priv->vbt.lvds_ssc_freq,
 387                               dev_priv->vbt.display_clock_mode,
 388                               dev_priv->vbt.fdi_rx_polarity_inverted);
 389         }
 390 }
 391
 392 static void
 393 parse_general_definitions(struct drm_i915_private *dev_priv,
 394                           struct bdb_header *bdb)
 395 {
 396         struct bdb_general_definitions *general;
 397
 398         general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 399         if (general) {
 400                 u16 block_size = get_blocksize(general);
 401                 if (block_size >= sizeof(*general)) {
 402                         int bus_pin = general->crt_ddc_gmbus_pin;
 403                         DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
 404                         if (intel_gmbus_is_port_valid(bus_pin))
 405                                 dev_priv->vbt.crt_ddc_pin = bus_pin;
 406                 } else {
 407                         DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
 408                                       block_size);
 409                 }
 410         }
 411 }
 412
 413 static void
 414 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
 415                           struct bdb_header *bdb)
 416 {
 417         struct sdvo_device_mapping *p_mapping;
 418         struct bdb_general_definitions *p_defs;
 419         union child_device_config *p_child;
 420         int i, child_device_num, count;
 421         u16     block_size;
 422
 423         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 424         if (!p_defs) {
 425                 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
 426                 return;
 427         }
 428         /* judge whether the size of child device meets the requirements.
 429          * If the child device size obtained from general definition block
 430          * is different with sizeof(struct child_device_config), skip the
 431          * parsing of sdvo device info
 432          */
 433         if (p_defs->child_dev_size != sizeof(*p_child)) {
 434                 /* different child dev size . Ignore it */
 435                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 436                 return;
 437         }
 438         /* get the block size of general definitions */
 439         block_size = get_blocksize(p_defs);
 440         /* get the number of child device */
 441         child_device_num = (block_size - sizeof(*p_defs)) /
 442                                 sizeof(*p_child);
 443         count = 0;
 444         for (i = 0; i < child_device_num; i++) {
 445                 p_child = &(p_defs->devices[i]);
 446                 if (!p_child->old.device_type) {
 447                         /* skip the device block if device type is invalid */
 448                         continue;
 449                 }
 450                 if (p_child->old.slave_addr != SLAVE_ADDR1 &&
 451                         p_child->old.slave_addr != SLAVE_ADDR2) {
 452                         /*
 453                          * If the slave address is neither 0x70 nor 0x72,
 454                          * it is not a SDVO device. Skip it.
 455                          */
 456                         continue;
 457                 }
 458                 if (p_child->old.dvo_port != DEVICE_PORT_DVOB &&
 459                         p_child->old.dvo_port != DEVICE_PORT_DVOC) {
 460                         /* skip the incorrect SDVO port */
 461                         DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n");
 462                         continue;
 463                 }
 464                 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
 465                                 " %s port\n",
 466                                 p_child->old.slave_addr,
 467                                 (p_child->old.dvo_port == DEVICE_PORT_DVOB) ?
 468                                         "SDVOB" : "SDVOC");
 469                 p_mapping = &(dev_priv->sdvo_mappings[p_child->old.dvo_port - 1]);
 470                 if (!p_mapping->initialized) {
 471                         p_mapping->dvo_port = p_child->old.dvo_port;
 472                         p_mapping->slave_addr = p_child->old.slave_addr;
 473                         p_mapping->dvo_wiring = p_child->old.dvo_wiring;
 474                         p_mapping->ddc_pin = p_child->old.ddc_pin;
 475                         p_mapping->i2c_pin = p_child->old.i2c_pin;
 476                         p_mapping->initialized = 1;
 477                         DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n",
 478                                       p_mapping->dvo_port,
 479                                       p_mapping->slave_addr,
 480                                       p_mapping->dvo_wiring,
 481                                       p_mapping->ddc_pin,
 482                                       p_mapping->i2c_pin);
 483                 } else {
 484                         DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
 485                                          "two SDVO device.\n");
 486                 }
 487                 if (p_child->old.slave2_addr) {
 488                         /* Maybe this is a SDVO device with multiple inputs */
 489                         /* And the mapping info is not added */
 490                         DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
 491                                 " is a SDVO device with multiple inputs.\n");
 492                 }
 493                 count++;
 494         }
 495
 496         if (!count) {
 497                 /* No SDVO device info is found */
 498                 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
 499         }
 500         return;
 501 }
 502
 503 static void
 504 parse_driver_features(struct drm_i915_private *dev_priv,
 505                        struct bdb_header *bdb)
 506 {
 507         struct bdb_driver_features *driver;
 508
 509         driver = find_section(bdb, BDB_DRIVER_FEATURES);
 510         if (!driver)
 511                 return;
 512
 513         if (driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
 514                 dev_priv->vbt.edp_support = 1;
 515
 516         if (driver->dual_frequency)
 517                 dev_priv->render_reclock_avail = true;
 518 }
 519
 520 static void
 521 parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
 522 {
 523         struct bdb_edp *edp;
 524         struct edp_power_seq *edp_pps;
 525         struct edp_link_params *edp_link_params;
 526
 527         edp = find_section(bdb, BDB_EDP);
 528         if (!edp) {
 529                 if (dev_priv->vbt.edp_support)
 530                         DRM_DEBUG_KMS("No eDP BDB found but eDP panel supported.\n");
 531                 return;
 532         }
 533
 534         switch ((edp->color_depth >> (panel_type * 2)) & 3) {
 535         case EDP_18BPP:
 536                 dev_priv->vbt.edp_bpp = 18;
 537                 break;
 538         case EDP_24BPP:
 539                 dev_priv->vbt.edp_bpp = 24;
 540                 break;
 541         case EDP_30BPP:
 542                 dev_priv->vbt.edp_bpp = 30;
 543                 break;
 544         }
 545
 546         /* Get the eDP sequencing and link info */
 547         edp_pps = &edp->power_seqs[panel_type];
 548         edp_link_params = &edp->link_params[panel_type];
 549
 550         dev_priv->vbt.edp_pps = *edp_pps;
 551
 552         dev_priv->vbt.edp_rate = edp_link_params->rate ? DP_LINK_BW_2_7 :
 553                 DP_LINK_BW_1_62;
 554         switch (edp_link_params->lanes) {
 555         case 0:
 556                 dev_priv->vbt.edp_lanes = 1;
 557                 break;
 558         case 1:
 559                 dev_priv->vbt.edp_lanes = 2;
 560                 break;
 561         case 3:
 562         default:
 563                 dev_priv->vbt.edp_lanes = 4;
 564                 break;
 565         }
 566         switch (edp_link_params->preemphasis) {
 567         case 0:
 568                 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_0;
 569                 break;
 570         case 1:
 571                 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_3_5;
 572                 break;
 573         case 2:
 574                 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_6;
 575                 break;
 576         case 3:
 577                 dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_9_5;
 578                 break;
 579         }
 580         switch (edp_link_params->vswing) {
 581         case 0:
 582                 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_400;
 583                 break;
 584         case 1:
 585                 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_600;
 586                 break;
 587         case 2:
 588                 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_800;
 589                 break;
 590         case 3:
 591                 dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_1200;
 592                 break;
 593         }
 594 }
 595
 596 static void
 597 parse_mipi(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
 598 {
 599         struct bdb_mipi *mipi;
 600
 601         mipi = find_section(bdb, BDB_MIPI);
 602         if (!mipi) {
 603                 DRM_DEBUG_KMS("No MIPI BDB found");
 604                 return;
 605         }
 606
 607         /* XXX: add more info */
 608         dev_priv->vbt.dsi.panel_id = mipi->panel_id;
 609 }
 610
 611 static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
 612                            struct bdb_header *bdb)
 613 {
 614         union child_device_config *it, *child = NULL;
 615         struct ddi_vbt_port_info *info = &dev_priv->vbt.ddi_port_info[port];
 616         uint8_t hdmi_level_shift;
 617         int i, j;
 618         bool is_dvi, is_hdmi, is_dp, is_edp, is_crt;
 619         uint8_t aux_channel;
 620         /* Each DDI port can have more than one value on the "DVO Port" field,
 621          * so look for all the possible values for each port and abort if more
 622          * than one is found. */
 623         int dvo_ports[][2] = {
 624                 {DVO_PORT_HDMIA, DVO_PORT_DPA},
 625                 {DVO_PORT_HDMIB, DVO_PORT_DPB},
 626                 {DVO_PORT_HDMIC, DVO_PORT_DPC},
 627                 {DVO_PORT_HDMID, DVO_PORT_DPD},
 628                 {DVO_PORT_CRT, -1 /* Port E can only be DVO_PORT_CRT */ },
 629         };
 630
 631         /* Find the child device to use, abort if more than one found. */
 632         for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
 633                 it = dev_priv->vbt.child_dev + i;
 634
 635                 for (j = 0; j < 2; j++) {
 636                         if (dvo_ports[port][j] == -1)
 637                                 break;
 638
 639                         if (it->common.dvo_port == dvo_ports[port][j]) {
 640                                 if (child) {
 641                                         DRM_DEBUG_KMS("More than one child device for port %c in VBT.\n",
 642                                                       port_name(port));
 643                                         return;
 644                                 }
 645                                 child = it;
 646                         }
 647                 }
 648         }
 649         if (!child)
 650                 return;
 651
 652         aux_channel = child->raw[25];
 653
 654         is_dvi = child->common.device_type & DEVICE_TYPE_TMDS_DVI_SIGNALING;
 655         is_dp = child->common.device_type & DEVICE_TYPE_DISPLAYPORT_OUTPUT;
 656         is_crt = child->common.device_type & DEVICE_TYPE_ANALOG_OUTPUT;
 657         is_hdmi = is_dvi && (child->common.device_type & DEVICE_TYPE_NOT_HDMI_OUTPUT) == 0;
 658         is_edp = is_dp && (child->common.device_type & DEVICE_TYPE_INTERNAL_CONNECTOR);
 659
 660         info->supports_dvi = is_dvi;
 661         info->supports_hdmi = is_hdmi;
 662         info->supports_dp = is_dp;
 663
 664         DRM_DEBUG_KMS("Port %c VBT info: DP:%d HDMI:%d DVI:%d EDP:%d CRT:%d\n",
 665                       port_name(port), is_dp, is_hdmi, is_dvi, is_edp, is_crt);
 666
 667         if (is_edp && is_dvi)
 668                 DRM_DEBUG_KMS("Internal DP port %c is TMDS compatible\n",
 669                               port_name(port));
 670         if (is_crt && port != PORT_E)
 671                 DRM_DEBUG_KMS("Port %c is analog\n", port_name(port));
 672         if (is_crt && (is_dvi || is_dp))
 673                 DRM_DEBUG_KMS("Analog port %c is also DP or TMDS compatible\n",
 674                               port_name(port));
 675         if (is_dvi && (port == PORT_A || port == PORT_E))
 676                 DRM_DEBUG_KMS("Port %c is TMDS compabile\n", port_name(port));
 677         if (!is_dvi && !is_dp && !is_crt)
 678                 DRM_DEBUG_KMS("Port %c is not DP/TMDS/CRT compatible\n",
 679                               port_name(port));
 680         if (is_edp && (port == PORT_B || port == PORT_C || port == PORT_E))
 681                 DRM_DEBUG_KMS("Port %c is internal DP\n", port_name(port));
 682
 683         if (is_dvi) {
 684                 if (child->common.ddc_pin == 0x05 && port != PORT_B)
 685                         DRM_DEBUG_KMS("Unexpected DDC pin for port B\n");
 686                 if (child->common.ddc_pin == 0x04 && port != PORT_C)
 687                         DRM_DEBUG_KMS("Unexpected DDC pin for port C\n");
 688                 if (child->common.ddc_pin == 0x06 && port != PORT_D)
 689                         DRM_DEBUG_KMS("Unexpected DDC pin for port D\n");
 690         }
 691
 692         if (is_dp) {
 693                 if (aux_channel == 0x40 && port != PORT_A)
 694                         DRM_DEBUG_KMS("Unexpected AUX channel for port A\n");
 695                 if (aux_channel == 0x10 && port != PORT_B)
 696                         DRM_DEBUG_KMS("Unexpected AUX channel for port B\n");
 697                 if (aux_channel == 0x20 && port != PORT_C)
 698                         DRM_DEBUG_KMS("Unexpected AUX channel for port C\n");
 699                 if (aux_channel == 0x30 && port != PORT_D)
 700                         DRM_DEBUG_KMS("Unexpected AUX channel for port D\n");
 701         }
 702
 703         if (bdb->version >= 158) {
 704                 /* The VBT HDMI level shift values match the table we have. */
 705                 hdmi_level_shift = child->raw[7] & 0xF;
 706                 if (hdmi_level_shift < 0xC) {
 707                         DRM_DEBUG_KMS("VBT HDMI level shift for port %c: %d\n",
 708                                       port_name(port),
 709                                       hdmi_level_shift);
 710                         info->hdmi_level_shift = hdmi_level_shift;
 711                 }
 712         }
 713 }
 714
 715 static void parse_ddi_ports(struct drm_i915_private *dev_priv,
 716                             struct bdb_header *bdb)
 717 {
 718         struct drm_device *dev = dev_priv->dev;
 719         enum port port;
 720
 721         if (!HAS_DDI(dev))
 722                 return;
 723
 724         if (!dev_priv->vbt.child_dev_num)
 725                 return;
 726
 727         if (bdb->version < 155)
 728                 return;
 729
 730         for (port = PORT_A; port < I915_MAX_PORTS; port++)
 731                 parse_ddi_port(dev_priv, port, bdb);
 732 }
 733
 734 static void
 735 parse_device_mapping(struct drm_i915_private *dev_priv,
 736                        struct bdb_header *bdb)
 737 {
 738         struct bdb_general_definitions *p_defs;
 739         union child_device_config *p_child, *child_dev_ptr;
 740         int i, child_device_num, count;
 741         u16     block_size;
 742
 743         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 744         if (!p_defs) {
 745                 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
 746                 return;
 747         }
 748         /* judge whether the size of child device meets the requirements.
 749          * If the child device size obtained from general definition block
 750          * is different with sizeof(struct child_device_config), skip the
 751          * parsing of sdvo device info
 752          */
 753         if (p_defs->child_dev_size != sizeof(*p_child)) {
 754                 /* different child dev size . Ignore it */
 755                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 756                 return;
 757         }
 758         /* get the block size of general definitions */
 759         block_size = get_blocksize(p_defs);
 760         /* get the number of child device */
 761         child_device_num = (block_size - sizeof(*p_defs)) /
 762                                 sizeof(*p_child);
 763         count = 0;
 764         /* get the number of child device that is present */
 765         for (i = 0; i < child_device_num; i++) {
 766                 p_child = &(p_defs->devices[i]);
 767                 if (!p_child->common.device_type) {
 768                         /* skip the device block if device type is invalid */
 769                         continue;
 770                 }
 771                 count++;
 772         }
 773         if (!count) {
 774                 DRM_DEBUG_KMS("no child dev is parsed from VBT\n");
 775                 return;
 776         }
 777         dev_priv->vbt.child_dev = kmalloc(sizeof(*p_child) * count, M_DRM,
 778             M_WAITOK | M_ZERO);
 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 __init 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 bdb_header *bdb = NULL;
 876         u8 __iomem *bios = NULL;
 877
 878         if (HAS_PCH_NOP(dev))
 879                 return -ENODEV;
 880
 881         init_vbt_defaults(dev_priv);
 882
 883         /* XXX Should this validation be moved to intel_opregion.c? */
 884         if (!dmi_check_system(intel_no_opregion_vbt) && dev_priv->opregion.vbt) {
 885                 struct vbt_header *vbt = dev_priv->opregion.vbt;
 886                 if (memcmp(vbt->signature, "$VBT", 4) == 0) {
 887                         DRM_DEBUG_KMS("Using VBT from OpRegion: %20s\n",
 888                                          vbt->signature);
 889                         bdb = (struct bdb_header *)((char *)vbt + vbt->bdb_offset);
 890                 } else
 891                         dev_priv->opregion.vbt = NULL;
 892         }
 893         bios = NULL;
 894
 895 #if 1
 896         if (bdb == NULL) {
 897                 KIB_NOTYET();
 898                 return (-1);
 899         }
 900 #else
 901         if (bdb == NULL) {
 902                 struct vbt_header *vbt = NULL;
 903                 size_t size;
 904                 int i;
 905
 906                 bios = pci_map_rom(pdev, &size);
 907                 if (!bios)
 908                         return -1;
 909
 910                 /* Scour memory looking for the VBT signature */
 911                 for (i = 0; i + 4 < size; i++) {
 912                         if (!memcmp(bios + i, "$VBT", 4)) {
 913                                 vbt = (struct vbt_header *)(bios + i);
 914                                 break;
 915                         }
 916                 }
 917
 918                 if (!vbt) {
 919                         DRM_DEBUG_DRIVER("VBT signature missing\n");
 920                         pci_unmap_rom(pdev, bios);
 921                         return -1;
 922                 }
 923
 924                 bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
 925         }
 926 #endif
 927
 928         /* Grab useful general definitions */
 929         parse_general_features(dev_priv, bdb);
 930         parse_general_definitions(dev_priv, bdb);
 931         parse_lfp_panel_data(dev_priv, bdb);
 932         parse_lfp_backlight(dev_priv, bdb);
 933         parse_sdvo_panel_data(dev_priv, bdb);
 934         parse_sdvo_device_mapping(dev_priv, bdb);
 935         parse_device_mapping(dev_priv, bdb);
 936         parse_driver_features(dev_priv, bdb);
 937         parse_edp(dev_priv, bdb);
 938         parse_mipi(dev_priv, bdb);
 939         parse_ddi_ports(dev_priv, bdb);
 940
 941 #if 0
 942         if (bios)
 943                 pci_unmap_rom(pdev, bios);
 944 #endif
 945
 946         return 0;
 947 }
 948
 949 /* Ensure that vital registers have been initialised, even if the BIOS
 950  * is absent or just failing to do its job.
 951  */
 952 void intel_setup_bios(struct drm_device *dev)
 953 {
 954         struct drm_i915_private *dev_priv = dev->dev_private;
 955
 956          /* Set the Panel Power On/Off timings if uninitialized. */
 957         if (!HAS_PCH_SPLIT(dev) &&
 958             I915_READ(PP_ON_DELAYS) == 0 && I915_READ(PP_OFF_DELAYS) == 0) {
 959                 /* Set T2 to 40ms and T5 to 200ms */
 960                 I915_WRITE(PP_ON_DELAYS, 0x019007d0);
 961
 962                 /* Set T3 to 35ms and Tx to 200ms */
 963                 I915_WRITE(PP_OFF_DELAYS, 0x015e07d0);
 964         }
 965 }