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 void *
  37 find_section(struct bdb_header *bdb, int section_id)
  38 {
  39         u8 *base = (u8 *)bdb;
  40         int index = 0;
  41         u16 total, current_size;
  42         u8 current_id;
  43
  44         /* skip to first section */
  45         index += bdb->header_size;
  46         total = bdb->bdb_size;
  47
  48         /* walk the sections looking for section_id */
  49         while (index < total) {
  50                 current_id = *(base + index);
  51                 index++;
  52                 current_size = *((u16 *)(base + index));
  53                 index += 2;
  54                 if (current_id == section_id)
  55                         return base + index;
  56                 index += current_size;
  57         }
  58
  59         return NULL;
  60 }
  61
  62 static u16
  63 get_blocksize(void *p)
  64 {
  65         u16 *block_ptr, block_size;
  66
  67         block_ptr = (u16 *)((char *)p - 2);
  68         block_size = *block_ptr;
  69         return block_size;
  70 }
  71
  72 static void
  73 fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
  74                         struct lvds_dvo_timing *dvo_timing)
  75 {
  76         panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
  77                 dvo_timing->hactive_lo;
  78         panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
  79                 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
  80         panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
  81                 dvo_timing->hsync_pulse_width;
  82         panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
  83                 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
  84
  85         panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
  86                 dvo_timing->vactive_lo;
  87         panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
  88                 dvo_timing->vsync_off;
  89         panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
  90                 dvo_timing->vsync_pulse_width;
  91         panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
  92                 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
  93         panel_fixed_mode->clock = dvo_timing->clock * 10;
  94         panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
  95
  96         /* Some VBTs have bogus h/vtotal values */
  97         if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
  98                 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
  99         if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
 100                 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
 101
 102         drm_mode_set_name(panel_fixed_mode);
 103 }
 104
 105 /* Try to find integrated panel data */
 106 static void
 107 parse_lfp_panel_data(struct drm_i915_private *dev_priv,
 108                             struct bdb_header *bdb)
 109 {
 110         struct bdb_lvds_options *lvds_options;
 111         struct bdb_lvds_lfp_data *lvds_lfp_data;
 112         struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
 113         struct bdb_lvds_lfp_data_entry *entry;
 114         struct lvds_dvo_timing *dvo_timing;
 115         struct drm_display_mode *panel_fixed_mode;
 116         int lfp_data_size, dvo_timing_offset;
 117         int i, temp_downclock;
 118         struct drm_display_mode *temp_mode;
 119
 120         /* Defaults if we can't find VBT info */
 121         dev_priv->lvds_dither = 0;
 122         dev_priv->lvds_vbt = 0;
 123
 124         lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
 125         if (!lvds_options)
 126                 return;
 127
 128         dev_priv->lvds_dither = lvds_options->pixel_dither;
 129         if (lvds_options->panel_type == 0xff)
 130                 return;
 131
 132         lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
 133         if (!lvds_lfp_data)
 134                 return;
 135
 136         lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
 137         if (!lvds_lfp_data_ptrs)
 138                 return;
 139
 140         dev_priv->lvds_vbt = 1;
 141
 142         lfp_data_size = lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
 143                 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
 144         entry = (struct bdb_lvds_lfp_data_entry *)
 145                 ((uint8_t *)lvds_lfp_data->data + (lfp_data_size *
 146                                                    lvds_options->panel_type));
 147         dvo_timing_offset = lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset -
 148                 lvds_lfp_data_ptrs->ptr[0].fp_timing_offset;
 149
 150         /*
 151          * the size of fp_timing varies on the different platform.
 152          * So calculate the DVO timing relative offset in LVDS data
 153          * entry to get the DVO timing entry
 154          */
 155         dvo_timing = (struct lvds_dvo_timing *)
 156                         ((unsigned char *)entry + dvo_timing_offset);
 157
 158         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 159
 160         fill_detail_timing_data(panel_fixed_mode, dvo_timing);
 161
 162         dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
 163
 164         DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n");
 165         drm_mode_debug_printmodeline(panel_fixed_mode);
 166
 167         temp_mode = kzalloc(sizeof(*temp_mode), GFP_KERNEL);
 168         temp_downclock = panel_fixed_mode->clock;
 169         /*
 170          * enumerate the LVDS panel timing info entry in VBT to check whether
 171          * the LVDS downclock is found.
 172          */
 173         for (i = 0; i < 16; i++) {
 174                 entry = (struct bdb_lvds_lfp_data_entry *)
 175                         ((uint8_t *)lvds_lfp_data->data + (lfp_data_size * i));
 176                 dvo_timing = (struct lvds_dvo_timing *)
 177                         ((unsigned char *)entry + dvo_timing_offset);
 178
 179                 fill_detail_timing_data(temp_mode, dvo_timing);
 180
 181                 if (temp_mode->hdisplay == panel_fixed_mode->hdisplay &&
 182                 temp_mode->hsync_start == panel_fixed_mode->hsync_start &&
 183                 temp_mode->hsync_end == panel_fixed_mode->hsync_end &&
 184                 temp_mode->htotal == panel_fixed_mode->htotal &&
 185                 temp_mode->vdisplay == panel_fixed_mode->vdisplay &&
 186                 temp_mode->vsync_start == panel_fixed_mode->vsync_start &&
 187                 temp_mode->vsync_end == panel_fixed_mode->vsync_end &&
 188                 temp_mode->vtotal == panel_fixed_mode->vtotal &&
 189                 temp_mode->clock < temp_downclock) {
 190                         /*
 191                          * downclock is already found. But we expect
 192                          * to find the lower downclock.
 193                          */
 194                         temp_downclock = temp_mode->clock;
 195                 }
 196                 /* clear it to zero */
 197                 memset(temp_mode, 0, sizeof(*temp_mode));
 198         }
 199         kfree(temp_mode);
 200         if (temp_downclock < panel_fixed_mode->clock &&
 201             i915_lvds_downclock) {
 202                 dev_priv->lvds_downclock_avail = 1;
 203                 dev_priv->lvds_downclock = temp_downclock;
 204                 DRM_DEBUG_KMS("LVDS downclock is found in VBT. ",
 205                                 "Normal Clock %dKHz, downclock %dKHz\n",
 206                                 temp_downclock, panel_fixed_mode->clock);
 207         }
 208         return;
 209 }
 210
 211 /* Try to find sdvo panel data */
 212 static void
 213 parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
 214                       struct bdb_header *bdb)
 215 {
 216         struct bdb_sdvo_lvds_options *sdvo_lvds_options;
 217         struct lvds_dvo_timing *dvo_timing;
 218         struct drm_display_mode *panel_fixed_mode;
 219
 220         dev_priv->sdvo_lvds_vbt_mode = NULL;
 221
 222         sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
 223         if (!sdvo_lvds_options)
 224                 return;
 225
 226         dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
 227         if (!dvo_timing)
 228                 return;
 229
 230         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 231
 232         if (!panel_fixed_mode)
 233                 return;
 234
 235         fill_detail_timing_data(panel_fixed_mode,
 236                         dvo_timing + sdvo_lvds_options->panel_type);
 237
 238         dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
 239
 240         return;
 241 }
 242
 243 static void
 244 parse_general_features(struct drm_i915_private *dev_priv,
 245                        struct bdb_header *bdb)
 246 {
 247         struct bdb_general_features *general;
 248
 249         /* Set sensible defaults in case we can't find the general block */
 250         dev_priv->int_tv_support = 1;
 251         dev_priv->int_crt_support = 1;
 252
 253         general = find_section(bdb, BDB_GENERAL_FEATURES);
 254         if (general) {
 255                 dev_priv->int_tv_support = general->int_tv_support;
 256                 dev_priv->int_crt_support = general->int_crt_support;
 257                 dev_priv->lvds_use_ssc = general->enable_ssc;
 258
 259                 if (dev_priv->lvds_use_ssc) {
 260                         if (IS_I85X(dev_priv->dev))
 261                                 dev_priv->lvds_ssc_freq =
 262                                         general->ssc_freq ? 66 : 48;
 263                         else if (IS_IRONLAKE(dev_priv->dev))
 264                                 dev_priv->lvds_ssc_freq =
 265                                         general->ssc_freq ? 100 : 120;
 266                         else
 267                                 dev_priv->lvds_ssc_freq =
 268                                         general->ssc_freq ? 100 : 96;
 269                 }
 270         }
 271 }
 272
 273 static void
 274 parse_general_definitions(struct drm_i915_private *dev_priv,
 275                           struct bdb_header *bdb)
 276 {
 277         struct bdb_general_definitions *general;
 278         const int crt_bus_map_table[] = {
 279                 GPIOB,
 280                 GPIOA,
 281                 GPIOC,
 282                 GPIOD,
 283                 GPIOE,
 284                 GPIOF,
 285         };
 286
 287         general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 288         if (general) {
 289                 u16 block_size = get_blocksize(general);
 290                 if (block_size >= sizeof(*general)) {
 291                         int bus_pin = general->crt_ddc_gmbus_pin;
 292                         DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
 293                         if ((bus_pin >= 1) && (bus_pin <= 6)) {
 294                                 dev_priv->crt_ddc_bus =
 295                                         crt_bus_map_table[bus_pin-1];
 296                         }
 297                 } else {
 298                         DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
 299                                   block_size);
 300                 }
 301         }
 302 }
 303
 304 static void
 305 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
 306                        struct bdb_header *bdb)
 307 {
 308         struct sdvo_device_mapping *p_mapping;
 309         struct bdb_general_definitions *p_defs;
 310         struct child_device_config *p_child;
 311         int i, child_device_num, count;
 312         u16     block_size;
 313
 314         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 315         if (!p_defs) {
 316                 DRM_DEBUG_KMS("No general definition block is found\n");
 317                 return;
 318         }
 319         /* judge whether the size of child device meets the requirements.
 320          * If the child device size obtained from general definition block
 321          * is different with sizeof(struct child_device_config), skip the
 322          * parsing of sdvo device info
 323          */
 324         if (p_defs->child_dev_size != sizeof(*p_child)) {
 325                 /* different child dev size . Ignore it */
 326                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 327                 return;
 328         }
 329         /* get the block size of general definitions */
 330         block_size = get_blocksize(p_defs);
 331         /* get the number of child device */
 332         child_device_num = (block_size - sizeof(*p_defs)) /
 333                                 sizeof(*p_child);
 334         count = 0;
 335         for (i = 0; i < child_device_num; i++) {
 336                 p_child = &(p_defs->devices[i]);
 337                 if (!p_child->device_type) {
 338                         /* skip the device block if device type is invalid */
 339                         continue;
 340                 }
 341                 if (p_child->slave_addr != SLAVE_ADDR1 &&
 342                         p_child->slave_addr != SLAVE_ADDR2) {
 343                         /*
 344                          * If the slave address is neither 0x70 nor 0x72,
 345                          * it is not a SDVO device. Skip it.
 346                          */
 347                         continue;
 348                 }
 349                 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
 350                         p_child->dvo_port != DEVICE_PORT_DVOC) {
 351                         /* skip the incorrect SDVO port */
 352                         DRM_DEBUG_KMS("Incorrect SDVO port. Skip it \n");
 353                         continue;
 354                 }
 355                 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
 356                                 " %s port\n",
 357                                 p_child->slave_addr,
 358                                 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
 359                                         "SDVOB" : "SDVOC");
 360                 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
 361                 if (!p_mapping->initialized) {
 362                         p_mapping->dvo_port = p_child->dvo_port;
 363                         p_mapping->slave_addr = p_child->slave_addr;
 364                         p_mapping->dvo_wiring = p_child->dvo_wiring;
 365                         p_mapping->initialized = 1;
 366                 } else {
 367                         DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
 368                                          "two SDVO device.\n");
 369                 }
 370                 if (p_child->slave2_addr) {
 371                         /* Maybe this is a SDVO device with multiple inputs */
 372                         /* And the mapping info is not added */
 373                         DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
 374                                 " is a SDVO device with multiple inputs.\n");
 375                 }
 376                 count++;
 377         }
 378
 379         if (!count) {
 380                 /* No SDVO device info is found */
 381                 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
 382         }
 383         return;
 384 }
 385
 386 static void
 387 parse_driver_features(struct drm_i915_private *dev_priv,
 388                        struct bdb_header *bdb)
 389 {
 390         struct drm_device *dev = dev_priv->dev;
 391         struct bdb_driver_features *driver;
 392
 393         driver = find_section(bdb, BDB_DRIVER_FEATURES);
 394         if (!driver)
 395                 return;
 396
 397         if (driver && SUPPORTS_EDP(dev) &&
 398             driver->lvds_config == BDB_DRIVER_FEATURE_EDP) {
 399                 dev_priv->edp_support = 1;
 400         } else {
 401                 dev_priv->edp_support = 0;
 402         }
 403
 404         if (driver && driver->dual_frequency)
 405                 dev_priv->render_reclock_avail = true;
 406 }
 407
 408 static void
 409 parse_device_mapping(struct drm_i915_private *dev_priv,
 410                        struct bdb_header *bdb)
 411 {
 412         struct bdb_general_definitions *p_defs;
 413         struct child_device_config *p_child, *child_dev_ptr;
 414         int i, child_device_num, count;
 415         u16     block_size;
 416
 417         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 418         if (!p_defs) {
 419                 DRM_DEBUG_KMS("No general definition block is found\n");
 420                 return;
 421         }
 422         /* judge whether the size of child device meets the requirements.
 423          * If the child device size obtained from general definition block
 424          * is different with sizeof(struct child_device_config), skip the
 425          * parsing of sdvo device info
 426          */
 427         if (p_defs->child_dev_size != sizeof(*p_child)) {
 428                 /* different child dev size . Ignore it */
 429                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 430                 return;
 431         }
 432         /* get the block size of general definitions */
 433         block_size = get_blocksize(p_defs);
 434         /* get the number of child device */
 435         child_device_num = (block_size - sizeof(*p_defs)) /
 436                                 sizeof(*p_child);
 437         count = 0;
 438         /* get the number of child device that is present */
 439         for (i = 0; i < child_device_num; i++) {
 440                 p_child = &(p_defs->devices[i]);
 441                 if (!p_child->device_type) {
 442                         /* skip the device block if device type is invalid */
 443                         continue;
 444                 }
 445                 count++;
 446         }
 447         if (!count) {
 448                 DRM_DEBUG_KMS("no child dev is parsed from VBT \n");
 449                 return;
 450         }
 451         dev_priv->child_dev = kzalloc(sizeof(*p_child) * count, GFP_KERNEL);
 452         if (!dev_priv->child_dev) {
 453                 DRM_DEBUG_KMS("No memory space for child device\n");
 454                 return;
 455         }
 456
 457         dev_priv->child_dev_num = count;
 458         count = 0;
 459         for (i = 0; i < child_device_num; i++) {
 460                 p_child = &(p_defs->devices[i]);
 461                 if (!p_child->device_type) {
 462                         /* skip the device block if device type is invalid */
 463                         continue;
 464                 }
 465                 child_dev_ptr = dev_priv->child_dev + count;
 466                 count++;
 467                 memcpy((void *)child_dev_ptr, (void *)p_child,
 468                                         sizeof(*p_child));
 469         }
 470         return;
 471 }
 472 /**
 473  * intel_init_bios - initialize VBIOS settings & find VBT
 474  * @dev: DRM device
 475  *
 476  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
 477  * to appropriate values.
 478  *
 479  * VBT existence is a sanity check that is relied on by other i830_bios.c code.
 480  * Note that it would be better to use a BIOS call to get the VBT, as BIOSes may
 481  * feed an updated VBT back through that, compared to what we'll fetch using
 482  * this method of groping around in the BIOS data.
 483  *
 484  * Returns 0 on success, nonzero on failure.
 485  */
 486 bool
 487 intel_init_bios(struct drm_device *dev)
 488 {
 489         struct drm_i915_private *dev_priv = dev->dev_private;
 490         struct pci_dev *pdev = dev->pdev;
 491         struct vbt_header *vbt = NULL;
 492         struct bdb_header *bdb;
 493         u8 __iomem *bios;
 494         size_t size;
 495         int i;
 496
 497         bios = pci_map_rom(pdev, &size);
 498         if (!bios)
 499                 return -1;
 500
 501         /* Scour memory looking for the VBT signature */
 502         for (i = 0; i + 4 < size; i++) {
 503                 if (!memcmp(bios + i, "$VBT", 4)) {
 504                         vbt = (struct vbt_header *)(bios + i);
 505                         break;
 506                 }
 507         }
 508
 509         if (!vbt) {
 510                 DRM_ERROR("VBT signature missing\n");
 511                 pci_unmap_rom(pdev, bios);
 512                 return -1;
 513         }
 514
 515         bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
 516
 517         /* Grab useful general definitions */
 518         parse_general_features(dev_priv, bdb);
 519         parse_general_definitions(dev_priv, bdb);
 520         parse_lfp_panel_data(dev_priv, bdb);
 521         parse_sdvo_panel_data(dev_priv, bdb);
 522         parse_sdvo_device_mapping(dev_priv, bdb);
 523         parse_device_mapping(dev_priv, bdb);
 524         parse_driver_features(dev_priv, bdb);
 525
 526         pci_unmap_rom(pdev, bios);
 527
 528         return 0;
 529 }