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 "drmP.h"
  28 #include "drm.h"
  29 #include "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                         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         /* Some VBTs have bogus h/vtotal values */
  99         if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
 100                 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
 101         if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
 102                 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
 103
 104         drm_mode_set_name(panel_fixed_mode);
 105 }
 106
 107 /* Try to find integrated panel data */
 108 static void
 109 parse_lfp_panel_data(struct drm_i915_private *dev_priv,
 110                             struct bdb_header *bdb)
 111 {
 112         struct bdb_lvds_options *lvds_options;
 113         struct bdb_lvds_lfp_data *lvds_lfp_data;
 114         struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
 115         struct bdb_lvds_lfp_data_entry *entry;
 116         struct lvds_dvo_timing *dvo_timing;
 117         struct drm_display_mode *panel_fixed_mode;
 118         int lfp_data_size, dvo_timing_offset;
 119         int i, temp_downclock;
 120         struct drm_display_mode *temp_mode;
 121
 122         /* Defaults if we can't find VBT info */
 123         dev_priv->lvds_dither = 0;
 124         dev_priv->lvds_vbt = 0;
 125
 126         lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
 127         if (!lvds_options)
 128                 return;
 129
 130         dev_priv->lvds_dither = lvds_options->pixel_dither;
 131         if (lvds_options->panel_type == 0xff)
 132                 return;
 133         panel_type = lvds_options->panel_type;
 134
 135         lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
 136         if (!lvds_lfp_data)
 137                 return;
 138
 139         lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
 140         if (!lvds_lfp_data_ptrs)
 141                 return;
 142
 143         dev_priv->lvds_vbt = 1;
 144
 145         lfp_data_size = lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
 146                 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
 147         entry = (struct bdb_lvds_lfp_data_entry *)
 148                 ((uint8_t *)lvds_lfp_data->data + (lfp_data_size *
 149                                                    lvds_options->panel_type));
 150         dvo_timing_offset = lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset -
 151                 lvds_lfp_data_ptrs->ptr[0].fp_timing_offset;
 152
 153         /*
 154          * the size of fp_timing varies on the different platform.
 155          * So calculate the DVO timing relative offset in LVDS data
 156          * entry to get the DVO timing entry
 157          */
 158         dvo_timing = (struct lvds_dvo_timing *)
 159                         ((unsigned char *)entry + dvo_timing_offset);
 160
 161         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 162
 163         fill_detail_timing_data(panel_fixed_mode, dvo_timing);
 164
 165         dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
 166
 167         DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n");
 168         drm_mode_debug_printmodeline(panel_fixed_mode);
 169
 170         temp_mode = kzalloc(sizeof(*temp_mode), GFP_KERNEL);
 171         temp_downclock = panel_fixed_mode->clock;
 172         /*
 173          * enumerate the LVDS panel timing info entry in VBT to check whether
 174          * the LVDS downclock is found.
 175          */
 176         for (i = 0; i < 16; i++) {
 177                 entry = (struct bdb_lvds_lfp_data_entry *)
 178                         ((uint8_t *)lvds_lfp_data->data + (lfp_data_size * i));
 179                 dvo_timing = (struct lvds_dvo_timing *)
 180                         ((unsigned char *)entry + dvo_timing_offset);
 181
 182                 fill_detail_timing_data(temp_mode, dvo_timing);
 183
 184                 if (temp_mode->hdisplay == panel_fixed_mode->hdisplay &&
 185                 temp_mode->hsync_start == panel_fixed_mode->hsync_start &&
 186                 temp_mode->hsync_end == panel_fixed_mode->hsync_end &&
 187                 temp_mode->htotal == panel_fixed_mode->htotal &&
 188                 temp_mode->vdisplay == panel_fixed_mode->vdisplay &&
 189                 temp_mode->vsync_start == panel_fixed_mode->vsync_start &&
 190                 temp_mode->vsync_end == panel_fixed_mode->vsync_end &&
 191                 temp_mode->vtotal == panel_fixed_mode->vtotal &&
 192                 temp_mode->clock < temp_downclock) {
 193                         /*
 194                          * downclock is already found. But we expect
 195                          * to find the lower downclock.
 196                          */
 197                         temp_downclock = temp_mode->clock;
 198                 }
 199                 /* clear it to zero */
 200                 memset(temp_mode, 0, sizeof(*temp_mode));
 201         }
 202         kfree(temp_mode);
 203         if (temp_downclock < panel_fixed_mode->clock &&
 204             i915_lvds_downclock) {
 205                 dev_priv->lvds_downclock_avail = 1;
 206                 dev_priv->lvds_downclock = temp_downclock;
 207                 DRM_DEBUG_KMS("LVDS downclock is found in VBT. ",
 208                                 "Normal Clock %dKHz, downclock %dKHz\n",
 209                                 temp_downclock, panel_fixed_mode->clock);
 210         }
 211         return;
 212 }
 213
 214 /* Try to find sdvo panel data */
 215 static void
 216 parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
 217                       struct bdb_header *bdb)
 218 {
 219         struct bdb_sdvo_lvds_options *sdvo_lvds_options;
 220         struct lvds_dvo_timing *dvo_timing;
 221         struct drm_display_mode *panel_fixed_mode;
 222
 223         dev_priv->sdvo_lvds_vbt_mode = NULL;
 224
 225         sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
 226         if (!sdvo_lvds_options)
 227                 return;
 228
 229         dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
 230         if (!dvo_timing)
 231                 return;
 232
 233         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 234
 235         if (!panel_fixed_mode)
 236                 return;
 237
 238         fill_detail_timing_data(panel_fixed_mode,
 239                         dvo_timing + sdvo_lvds_options->panel_type);
 240
 241         dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
 242
 243         return;
 244 }
 245
 246 static void
 247 parse_general_features(struct drm_i915_private *dev_priv,
 248                        struct bdb_header *bdb)
 249 {
 250         struct drm_device *dev = dev_priv->dev;
 251         struct bdb_general_features *general;
 252
 253         /* Set sensible defaults in case we can't find the general block */
 254         dev_priv->int_tv_support = 1;
 255         dev_priv->int_crt_support = 1;
 256
 257         general = find_section(bdb, BDB_GENERAL_FEATURES);
 258         if (general) {
 259                 dev_priv->int_tv_support = general->int_tv_support;
 260                 dev_priv->int_crt_support = general->int_crt_support;
 261                 dev_priv->lvds_use_ssc = general->enable_ssc;
 262
 263                 if (dev_priv->lvds_use_ssc) {
 264                         if (IS_I85X(dev_priv->dev))
 265                                 dev_priv->lvds_ssc_freq =
 266                                         general->ssc_freq ? 66 : 48;
 267                         else if (IS_IRONLAKE(dev_priv->dev) || IS_GEN6(dev))
 268                                 dev_priv->lvds_ssc_freq =
 269                                         general->ssc_freq ? 100 : 120;
 270                         else
 271                                 dev_priv->lvds_ssc_freq =
 272                                         general->ssc_freq ? 100 : 96;
 273                 }
 274         }
 275 }
 276
 277 static void
 278 parse_general_definitions(struct drm_i915_private *dev_priv,
 279                           struct bdb_header *bdb)
 280 {
 281         struct bdb_general_definitions *general;
 282         const int crt_bus_map_table[] = {
 283                 GPIOB,
 284                 GPIOA,
 285                 GPIOC,
 286                 GPIOD,
 287                 GPIOE,
 288                 GPIOF,
 289         };
 290
 291         general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 292         if (general) {
 293                 u16 block_size = get_blocksize(general);
 294                 if (block_size >= sizeof(*general)) {
 295                         int bus_pin = general->crt_ddc_gmbus_pin;
 296                         DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
 297                         if ((bus_pin >= 1) && (bus_pin <= 6)) {
 298                                 dev_priv->crt_ddc_bus =
 299                                         crt_bus_map_table[bus_pin-1];
 300                         }
 301                 } else {
 302                         DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
 303                                   block_size);
 304                 }
 305         }
 306 }
 307
 308 static void
 309 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
 310                        struct bdb_header *bdb)
 311 {
 312         struct sdvo_device_mapping *p_mapping;
 313         struct bdb_general_definitions *p_defs;
 314         struct child_device_config *p_child;
 315         int i, child_device_num, count;
 316         u16     block_size;
 317
 318         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 319         if (!p_defs) {
 320                 DRM_DEBUG_KMS("No general definition block is found\n");
 321                 return;
 322         }
 323         /* judge whether the size of child device meets the requirements.
 324          * If the child device size obtained from general definition block
 325          * is different with sizeof(struct child_device_config), skip the
 326          * parsing of sdvo device info
 327          */
 328         if (p_defs->child_dev_size != sizeof(*p_child)) {
 329                 /* different child dev size . Ignore it */
 330                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 331                 return;
 332         }
 333         /* get the block size of general definitions */
 334         block_size = get_blocksize(p_defs);
 335         /* get the number of child device */
 336         child_device_num = (block_size - sizeof(*p_defs)) /
 337                                 sizeof(*p_child);
 338         count = 0;
 339         for (i = 0; i < child_device_num; i++) {
 340                 p_child = &(p_defs->devices[i]);
 341                 if (!p_child->device_type) {
 342                         /* skip the device block if device type is invalid */
 343                         continue;
 344                 }
 345                 if (p_child->slave_addr != SLAVE_ADDR1 &&
 346                         p_child->slave_addr != SLAVE_ADDR2) {
 347                         /*
 348                          * If the slave address is neither 0x70 nor 0x72,
 349                          * it is not a SDVO device. Skip it.
 350                          */
 351                         continue;
 352                 }
 353                 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
 354                         p_child->dvo_port != DEVICE_PORT_DVOC) {
 355                         /* skip the incorrect SDVO port */
 356                         DRM_DEBUG_KMS("Incorrect SDVO port. Skip it \n");
 357                         continue;
 358                 }
 359                 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
 360                                 " %s port\n",
 361                                 p_child->slave_addr,
 362                                 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
 363                                         "SDVOB" : "SDVOC");
 364                 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
 365                 if (!p_mapping->initialized) {
 366                         p_mapping->dvo_port = p_child->dvo_port;
 367                         p_mapping->slave_addr = p_child->slave_addr;
 368                         p_mapping->dvo_wiring = p_child->dvo_wiring;
 369                         p_mapping->ddc_pin = p_child->ddc_pin;
 370                         p_mapping->initialized = 1;
 371                 } else {
 372                         DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
 373                                          "two SDVO device.\n");
 374                 }
 375                 if (p_child->slave2_addr) {
 376                         /* Maybe this is a SDVO device with multiple inputs */
 377                         /* And the mapping info is not added */
 378                         DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
 379                                 " is a SDVO device with multiple inputs.\n");
 380                 }
 381                 count++;
 382         }
 383
 384         if (!count) {
 385                 /* No SDVO device info is found */
 386                 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
 387         }
 388         return;
 389 }
 390
 391 static void
 392 parse_driver_features(struct drm_i915_private *dev_priv,
 393                        struct bdb_header *bdb)
 394 {
 395         struct drm_device *dev = dev_priv->dev;
 396         struct bdb_driver_features *driver;
 397
 398         driver = find_section(bdb, BDB_DRIVER_FEATURES);
 399         if (!driver)
 400                 return;
 401
 402         if (driver && SUPPORTS_EDP(dev) &&
 403             driver->lvds_config == BDB_DRIVER_FEATURE_EDP) {
 404                 dev_priv->edp_support = 1;
 405         } else {
 406                 dev_priv->edp_support = 0;
 407         }
 408
 409         if (driver && driver->dual_frequency)
 410                 dev_priv->render_reclock_avail = true;
 411 }
 412
 413 static void
 414 parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
 415 {
 416         struct bdb_edp *edp;
 417
 418         edp = find_section(bdb, BDB_EDP);
 419         if (!edp) {
 420                 if (SUPPORTS_EDP(dev_priv->dev) && dev_priv->edp_support) {
 421                         DRM_DEBUG_KMS("No eDP BDB found but eDP panel "
 422                                       "supported, assume 18bpp panel color "
 423                                       "depth.\n");
 424                         dev_priv->edp_bpp = 18;
 425                 }
 426                 return;
 427         }
 428
 429         switch ((edp->color_depth >> (panel_type * 2)) & 3) {
 430         case EDP_18BPP:
 431                 dev_priv->edp_bpp = 18;
 432                 break;
 433         case EDP_24BPP:
 434                 dev_priv->edp_bpp = 24;
 435                 break;
 436         case EDP_30BPP:
 437                 dev_priv->edp_bpp = 30;
 438                 break;
 439         }
 440 }
 441
 442 static void
 443 parse_device_mapping(struct drm_i915_private *dev_priv,
 444                        struct bdb_header *bdb)
 445 {
 446         struct bdb_general_definitions *p_defs;
 447         struct child_device_config *p_child, *child_dev_ptr;
 448         int i, child_device_num, count;
 449         u16     block_size;
 450
 451         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 452         if (!p_defs) {
 453                 DRM_DEBUG_KMS("No general definition block is found\n");
 454                 return;
 455         }
 456         /* judge whether the size of child device meets the requirements.
 457          * If the child device size obtained from general definition block
 458          * is different with sizeof(struct child_device_config), skip the
 459          * parsing of sdvo device info
 460          */
 461         if (p_defs->child_dev_size != sizeof(*p_child)) {
 462                 /* different child dev size . Ignore it */
 463                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 464                 return;
 465         }
 466         /* get the block size of general definitions */
 467         block_size = get_blocksize(p_defs);
 468         /* get the number of child device */
 469         child_device_num = (block_size - sizeof(*p_defs)) /
 470                                 sizeof(*p_child);
 471         count = 0;
 472         /* get the number of child device that is present */
 473         for (i = 0; i < child_device_num; i++) {
 474                 p_child = &(p_defs->devices[i]);
 475                 if (!p_child->device_type) {
 476                         /* skip the device block if device type is invalid */
 477                         continue;
 478                 }
 479                 count++;
 480         }
 481         if (!count) {
 482                 DRM_DEBUG_KMS("no child dev is parsed from VBT \n");
 483                 return;
 484         }
 485         dev_priv->child_dev = kzalloc(sizeof(*p_child) * count, GFP_KERNEL);
 486         if (!dev_priv->child_dev) {
 487                 DRM_DEBUG_KMS("No memory space for child device\n");
 488                 return;
 489         }
 490
 491         dev_priv->child_dev_num = count;
 492         count = 0;
 493         for (i = 0; i < child_device_num; i++) {
 494                 p_child = &(p_defs->devices[i]);
 495                 if (!p_child->device_type) {
 496                         /* skip the device block if device type is invalid */
 497                         continue;
 498                 }
 499                 child_dev_ptr = dev_priv->child_dev + count;
 500                 count++;
 501                 memcpy((void *)child_dev_ptr, (void *)p_child,
 502                                         sizeof(*p_child));
 503         }
 504         return;
 505 }
 506 /**
 507  * intel_init_bios - initialize VBIOS settings & find VBT
 508  * @dev: DRM device
 509  *
 510  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
 511  * to appropriate values.
 512  *
 513  * VBT existence is a sanity check that is relied on by other i830_bios.c code.
 514  * Note that it would be better to use a BIOS call to get the VBT, as BIOSes may
 515  * feed an updated VBT back through that, compared to what we'll fetch using
 516  * this method of groping around in the BIOS data.
 517  *
 518  * Returns 0 on success, nonzero on failure.
 519  */
 520 bool
 521 intel_init_bios(struct drm_device *dev)
 522 {
 523         struct drm_i915_private *dev_priv = dev->dev_private;
 524         struct pci_dev *pdev = dev->pdev;
 525         struct vbt_header *vbt = NULL;
 526         struct bdb_header *bdb;
 527         u8 __iomem *bios;
 528         size_t size;
 529         int i;
 530
 531         bios = pci_map_rom(pdev, &size);
 532         if (!bios)
 533                 return -1;
 534
 535         /* Scour memory looking for the VBT signature */
 536         for (i = 0; i + 4 < size; i++) {
 537                 if (!memcmp(bios + i, "$VBT", 4)) {
 538                         vbt = (struct vbt_header *)(bios + i);
 539                         break;
 540                 }
 541         }
 542
 543         if (!vbt) {
 544                 DRM_ERROR("VBT signature missing\n");
 545                 pci_unmap_rom(pdev, bios);
 546                 return -1;
 547         }
 548
 549         bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
 550
 551         /* Grab useful general definitions */
 552         parse_general_features(dev_priv, bdb);
 553         parse_general_definitions(dev_priv, bdb);
 554         parse_lfp_panel_data(dev_priv, bdb);
 555         parse_sdvo_panel_data(dev_priv, bdb);
 556         parse_sdvo_device_mapping(dev_priv, bdb);
 557         parse_device_mapping(dev_priv, bdb);
 558         parse_driver_features(dev_priv, bdb);
 559         parse_edp(dev_priv, bdb);
 560
 561         pci_unmap_rom(pdev, bios);
 562
 563         return 0;
 564 }