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         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 /* Try to find integrated panel data */
 118 static void
 119 parse_lfp_panel_data(struct drm_i915_private *dev_priv,
 120                             struct bdb_header *bdb)
 121 {
 122         struct bdb_lvds_options *lvds_options;
 123         struct bdb_lvds_lfp_data *lvds_lfp_data;
 124         struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
 125         struct bdb_lvds_lfp_data_entry *entry;
 126         struct lvds_dvo_timing *dvo_timing;
 127         struct drm_display_mode *panel_fixed_mode;
 128         int lfp_data_size, dvo_timing_offset;
 129         int i, temp_downclock;
 130         struct drm_display_mode *temp_mode;
 131
 132         /* Defaults if we can't find VBT info */
 133         dev_priv->lvds_dither = 0;
 134         dev_priv->lvds_vbt = 0;
 135
 136         lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
 137         if (!lvds_options)
 138                 return;
 139
 140         dev_priv->lvds_dither = lvds_options->pixel_dither;
 141         if (lvds_options->panel_type == 0xff)
 142                 return;
 143         panel_type = lvds_options->panel_type;
 144
 145         lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
 146         if (!lvds_lfp_data)
 147                 return;
 148
 149         lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
 150         if (!lvds_lfp_data_ptrs)
 151                 return;
 152
 153         dev_priv->lvds_vbt = 1;
 154
 155         lfp_data_size = lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
 156                 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
 157         entry = (struct bdb_lvds_lfp_data_entry *)
 158                 ((uint8_t *)lvds_lfp_data->data + (lfp_data_size *
 159                                                    lvds_options->panel_type));
 160         dvo_timing_offset = lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset -
 161                 lvds_lfp_data_ptrs->ptr[0].fp_timing_offset;
 162
 163         /*
 164          * the size of fp_timing varies on the different platform.
 165          * So calculate the DVO timing relative offset in LVDS data
 166          * entry to get the DVO timing entry
 167          */
 168         dvo_timing = (struct lvds_dvo_timing *)
 169                         ((unsigned char *)entry + dvo_timing_offset);
 170
 171         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 172
 173         fill_detail_timing_data(panel_fixed_mode, dvo_timing);
 174
 175         dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
 176
 177         DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n");
 178         drm_mode_debug_printmodeline(panel_fixed_mode);
 179
 180         temp_mode = kzalloc(sizeof(*temp_mode), GFP_KERNEL);
 181         temp_downclock = panel_fixed_mode->clock;
 182         /*
 183          * enumerate the LVDS panel timing info entry in VBT to check whether
 184          * the LVDS downclock is found.
 185          */
 186         for (i = 0; i < 16; i++) {
 187                 entry = (struct bdb_lvds_lfp_data_entry *)
 188                         ((uint8_t *)lvds_lfp_data->data + (lfp_data_size * i));
 189                 dvo_timing = (struct lvds_dvo_timing *)
 190                         ((unsigned char *)entry + dvo_timing_offset);
 191
 192                 fill_detail_timing_data(temp_mode, dvo_timing);
 193
 194                 if (temp_mode->hdisplay == panel_fixed_mode->hdisplay &&
 195                 temp_mode->hsync_start == panel_fixed_mode->hsync_start &&
 196                 temp_mode->hsync_end == panel_fixed_mode->hsync_end &&
 197                 temp_mode->htotal == panel_fixed_mode->htotal &&
 198                 temp_mode->vdisplay == panel_fixed_mode->vdisplay &&
 199                 temp_mode->vsync_start == panel_fixed_mode->vsync_start &&
 200                 temp_mode->vsync_end == panel_fixed_mode->vsync_end &&
 201                 temp_mode->vtotal == panel_fixed_mode->vtotal &&
 202                 temp_mode->clock < temp_downclock) {
 203                         /*
 204                          * downclock is already found. But we expect
 205                          * to find the lower downclock.
 206                          */
 207                         temp_downclock = temp_mode->clock;
 208                 }
 209                 /* clear it to zero */
 210                 memset(temp_mode, 0, sizeof(*temp_mode));
 211         }
 212         kfree(temp_mode);
 213         if (temp_downclock < panel_fixed_mode->clock &&
 214             i915_lvds_downclock) {
 215                 dev_priv->lvds_downclock_avail = 1;
 216                 dev_priv->lvds_downclock = temp_downclock;
 217                 DRM_DEBUG_KMS("LVDS downclock is found in VBT. ",
 218                                 "Normal Clock %dKHz, downclock %dKHz\n",
 219                                 temp_downclock, panel_fixed_mode->clock);
 220         }
 221         return;
 222 }
 223
 224 /* Try to find sdvo panel data */
 225 static void
 226 parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
 227                       struct bdb_header *bdb)
 228 {
 229         struct bdb_sdvo_lvds_options *sdvo_lvds_options;
 230         struct lvds_dvo_timing *dvo_timing;
 231         struct drm_display_mode *panel_fixed_mode;
 232
 233         dev_priv->sdvo_lvds_vbt_mode = NULL;
 234
 235         sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
 236         if (!sdvo_lvds_options)
 237                 return;
 238
 239         dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
 240         if (!dvo_timing)
 241                 return;
 242
 243         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 244
 245         if (!panel_fixed_mode)
 246                 return;
 247
 248         fill_detail_timing_data(panel_fixed_mode,
 249                         dvo_timing + sdvo_lvds_options->panel_type);
 250
 251         dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
 252
 253         return;
 254 }
 255
 256 static void
 257 parse_general_features(struct drm_i915_private *dev_priv,
 258                        struct bdb_header *bdb)
 259 {
 260         struct drm_device *dev = dev_priv->dev;
 261         struct bdb_general_features *general;
 262
 263         /* Set sensible defaults in case we can't find the general block */
 264         dev_priv->int_tv_support = 1;
 265         dev_priv->int_crt_support = 1;
 266
 267         general = find_section(bdb, BDB_GENERAL_FEATURES);
 268         if (general) {
 269                 dev_priv->int_tv_support = general->int_tv_support;
 270                 dev_priv->int_crt_support = general->int_crt_support;
 271                 dev_priv->lvds_use_ssc = general->enable_ssc;
 272
 273                 if (dev_priv->lvds_use_ssc) {
 274                         if (IS_I85X(dev_priv->dev))
 275                                 dev_priv->lvds_ssc_freq =
 276                                         general->ssc_freq ? 66 : 48;
 277                         else if (IS_IRONLAKE(dev_priv->dev) || IS_GEN6(dev))
 278                                 dev_priv->lvds_ssc_freq =
 279                                         general->ssc_freq ? 100 : 120;
 280                         else
 281                                 dev_priv->lvds_ssc_freq =
 282                                         general->ssc_freq ? 100 : 96;
 283                 }
 284         }
 285 }
 286
 287 static void
 288 parse_general_definitions(struct drm_i915_private *dev_priv,
 289                           struct bdb_header *bdb)
 290 {
 291         struct bdb_general_definitions *general;
 292         const int crt_bus_map_table[] = {
 293                 GPIOB,
 294                 GPIOA,
 295                 GPIOC,
 296                 GPIOD,
 297                 GPIOE,
 298                 GPIOF,
 299         };
 300
 301         general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 302         if (general) {
 303                 u16 block_size = get_blocksize(general);
 304                 if (block_size >= sizeof(*general)) {
 305                         int bus_pin = general->crt_ddc_gmbus_pin;
 306                         DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
 307                         if ((bus_pin >= 1) && (bus_pin <= 6)) {
 308                                 dev_priv->crt_ddc_bus =
 309                                         crt_bus_map_table[bus_pin-1];
 310                         }
 311                 } else {
 312                         DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
 313                                   block_size);
 314                 }
 315         }
 316 }
 317
 318 static void
 319 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
 320                        struct bdb_header *bdb)
 321 {
 322         struct sdvo_device_mapping *p_mapping;
 323         struct bdb_general_definitions *p_defs;
 324         struct child_device_config *p_child;
 325         int i, child_device_num, count;
 326         u16     block_size;
 327
 328         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 329         if (!p_defs) {
 330                 DRM_DEBUG_KMS("No general definition block is found\n");
 331                 return;
 332         }
 333         /* judge whether the size of child device meets the requirements.
 334          * If the child device size obtained from general definition block
 335          * is different with sizeof(struct child_device_config), skip the
 336          * parsing of sdvo device info
 337          */
 338         if (p_defs->child_dev_size != sizeof(*p_child)) {
 339                 /* different child dev size . Ignore it */
 340                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 341                 return;
 342         }
 343         /* get the block size of general definitions */
 344         block_size = get_blocksize(p_defs);
 345         /* get the number of child device */
 346         child_device_num = (block_size - sizeof(*p_defs)) /
 347                                 sizeof(*p_child);
 348         count = 0;
 349         for (i = 0; i < child_device_num; i++) {
 350                 p_child = &(p_defs->devices[i]);
 351                 if (!p_child->device_type) {
 352                         /* skip the device block if device type is invalid */
 353                         continue;
 354                 }
 355                 if (p_child->slave_addr != SLAVE_ADDR1 &&
 356                         p_child->slave_addr != SLAVE_ADDR2) {
 357                         /*
 358                          * If the slave address is neither 0x70 nor 0x72,
 359                          * it is not a SDVO device. Skip it.
 360                          */
 361                         continue;
 362                 }
 363                 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
 364                         p_child->dvo_port != DEVICE_PORT_DVOC) {
 365                         /* skip the incorrect SDVO port */
 366                         DRM_DEBUG_KMS("Incorrect SDVO port. Skip it \n");
 367                         continue;
 368                 }
 369                 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
 370                                 " %s port\n",
 371                                 p_child->slave_addr,
 372                                 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
 373                                         "SDVOB" : "SDVOC");
 374                 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
 375                 if (!p_mapping->initialized) {
 376                         p_mapping->dvo_port = p_child->dvo_port;
 377                         p_mapping->slave_addr = p_child->slave_addr;
 378                         p_mapping->dvo_wiring = p_child->dvo_wiring;
 379                         p_mapping->ddc_pin = p_child->ddc_pin;
 380                         p_mapping->initialized = 1;
 381                 } else {
 382                         DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
 383                                          "two SDVO device.\n");
 384                 }
 385                 if (p_child->slave2_addr) {
 386                         /* Maybe this is a SDVO device with multiple inputs */
 387                         /* And the mapping info is not added */
 388                         DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
 389                                 " is a SDVO device with multiple inputs.\n");
 390                 }
 391                 count++;
 392         }
 393
 394         if (!count) {
 395                 /* No SDVO device info is found */
 396                 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
 397         }
 398         return;
 399 }
 400
 401 static void
 402 parse_driver_features(struct drm_i915_private *dev_priv,
 403                        struct bdb_header *bdb)
 404 {
 405         struct drm_device *dev = dev_priv->dev;
 406         struct bdb_driver_features *driver;
 407
 408         driver = find_section(bdb, BDB_DRIVER_FEATURES);
 409         if (!driver)
 410                 return;
 411
 412         if (driver && SUPPORTS_EDP(dev) &&
 413             driver->lvds_config == BDB_DRIVER_FEATURE_EDP) {
 414                 dev_priv->edp_support = 1;
 415         } else {
 416                 dev_priv->edp_support = 0;
 417         }
 418
 419         if (driver && driver->dual_frequency)
 420                 dev_priv->render_reclock_avail = true;
 421 }
 422
 423 static void
 424 parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
 425 {
 426         struct bdb_edp *edp;
 427
 428         edp = find_section(bdb, BDB_EDP);
 429         if (!edp) {
 430                 if (SUPPORTS_EDP(dev_priv->dev) && dev_priv->edp_support) {
 431                         DRM_DEBUG_KMS("No eDP BDB found but eDP panel "
 432                                       "supported, assume 18bpp panel color "
 433                                       "depth.\n");
 434                         dev_priv->edp_bpp = 18;
 435                 }
 436                 return;
 437         }
 438
 439         switch ((edp->color_depth >> (panel_type * 2)) & 3) {
 440         case EDP_18BPP:
 441                 dev_priv->edp_bpp = 18;
 442                 break;
 443         case EDP_24BPP:
 444                 dev_priv->edp_bpp = 24;
 445                 break;
 446         case EDP_30BPP:
 447                 dev_priv->edp_bpp = 30;
 448                 break;
 449         }
 450 }
 451
 452 static void
 453 parse_device_mapping(struct drm_i915_private *dev_priv,
 454                        struct bdb_header *bdb)
 455 {
 456         struct bdb_general_definitions *p_defs;
 457         struct child_device_config *p_child, *child_dev_ptr;
 458         int i, child_device_num, count;
 459         u16     block_size;
 460
 461         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 462         if (!p_defs) {
 463                 DRM_DEBUG_KMS("No general definition block is found\n");
 464                 return;
 465         }
 466         /* judge whether the size of child device meets the requirements.
 467          * If the child device size obtained from general definition block
 468          * is different with sizeof(struct child_device_config), skip the
 469          * parsing of sdvo device info
 470          */
 471         if (p_defs->child_dev_size != sizeof(*p_child)) {
 472                 /* different child dev size . Ignore it */
 473                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 474                 return;
 475         }
 476         /* get the block size of general definitions */
 477         block_size = get_blocksize(p_defs);
 478         /* get the number of child device */
 479         child_device_num = (block_size - sizeof(*p_defs)) /
 480                                 sizeof(*p_child);
 481         count = 0;
 482         /* get the number of child device that is present */
 483         for (i = 0; i < child_device_num; i++) {
 484                 p_child = &(p_defs->devices[i]);
 485                 if (!p_child->device_type) {
 486                         /* skip the device block if device type is invalid */
 487                         continue;
 488                 }
 489                 count++;
 490         }
 491         if (!count) {
 492                 DRM_DEBUG_KMS("no child dev is parsed from VBT \n");
 493                 return;
 494         }
 495         dev_priv->child_dev = kzalloc(sizeof(*p_child) * count, GFP_KERNEL);
 496         if (!dev_priv->child_dev) {
 497                 DRM_DEBUG_KMS("No memory space for child device\n");
 498                 return;
 499         }
 500
 501         dev_priv->child_dev_num = count;
 502         count = 0;
 503         for (i = 0; i < child_device_num; i++) {
 504                 p_child = &(p_defs->devices[i]);
 505                 if (!p_child->device_type) {
 506                         /* skip the device block if device type is invalid */
 507                         continue;
 508                 }
 509                 child_dev_ptr = dev_priv->child_dev + count;
 510                 count++;
 511                 memcpy((void *)child_dev_ptr, (void *)p_child,
 512                                         sizeof(*p_child));
 513         }
 514         return;
 515 }
 516 /**
 517  * intel_init_bios - initialize VBIOS settings & find VBT
 518  * @dev: DRM device
 519  *
 520  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
 521  * to appropriate values.
 522  *
 523  * VBT existence is a sanity check that is relied on by other i830_bios.c code.
 524  * Note that it would be better to use a BIOS call to get the VBT, as BIOSes may
 525  * feed an updated VBT back through that, compared to what we'll fetch using
 526  * this method of groping around in the BIOS data.
 527  *
 528  * Returns 0 on success, nonzero on failure.
 529  */
 530 bool
 531 intel_init_bios(struct drm_device *dev)
 532 {
 533         struct drm_i915_private *dev_priv = dev->dev_private;
 534         struct pci_dev *pdev = dev->pdev;
 535         struct vbt_header *vbt = NULL;
 536         struct bdb_header *bdb;
 537         u8 __iomem *bios;
 538         size_t size;
 539         int i;
 540
 541         bios = pci_map_rom(pdev, &size);
 542         if (!bios)
 543                 return -1;
 544
 545         /* Scour memory looking for the VBT signature */
 546         for (i = 0; i + 4 < size; i++) {
 547                 if (!memcmp(bios + i, "$VBT", 4)) {
 548                         vbt = (struct vbt_header *)(bios + i);
 549                         break;
 550                 }
 551         }
 552
 553         if (!vbt) {
 554                 DRM_ERROR("VBT signature missing\n");
 555                 pci_unmap_rom(pdev, bios);
 556                 return -1;
 557         }
 558
 559         bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
 560
 561         /* Grab useful general definitions */
 562         parse_general_features(dev_priv, bdb);
 563         parse_general_definitions(dev_priv, bdb);
 564         parse_lfp_panel_data(dev_priv, bdb);
 565         parse_sdvo_panel_data(dev_priv, bdb);
 566         parse_sdvo_device_mapping(dev_priv, bdb);
 567         parse_device_mapping(dev_priv, bdb);
 568         parse_driver_features(dev_priv, bdb);
 569         parse_edp(dev_priv, bdb);
 570
 571         pci_unmap_rom(pdev, bios);
 572
 573         return 0;
 574 }