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                 dev_priv->lvds_downclock_avail = 1;
 202                 dev_priv->lvds_downclock = temp_downclock;
 203                 DRM_DEBUG_KMS("LVDS downclock is found in VBT. ",
 204                                 "Normal Clock %dKHz, downclock %dKHz\n",
 205                                 temp_downclock, panel_fixed_mode->clock);
 206         }
 207         return;
 208 }
 209
 210 /* Try to find sdvo panel data */
 211 static void
 212 parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
 213                       struct bdb_header *bdb)
 214 {
 215         struct bdb_sdvo_lvds_options *sdvo_lvds_options;
 216         struct lvds_dvo_timing *dvo_timing;
 217         struct drm_display_mode *panel_fixed_mode;
 218
 219         dev_priv->sdvo_lvds_vbt_mode = NULL;
 220
 221         sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
 222         if (!sdvo_lvds_options)
 223                 return;
 224
 225         dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
 226         if (!dvo_timing)
 227                 return;
 228
 229         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 230
 231         if (!panel_fixed_mode)
 232                 return;
 233
 234         fill_detail_timing_data(panel_fixed_mode,
 235                         dvo_timing + sdvo_lvds_options->panel_type);
 236
 237         dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
 238
 239         return;
 240 }
 241
 242 static void
 243 parse_general_features(struct drm_i915_private *dev_priv,
 244                        struct bdb_header *bdb)
 245 {
 246         struct bdb_general_features *general;
 247
 248         /* Set sensible defaults in case we can't find the general block */
 249         dev_priv->int_tv_support = 1;
 250         dev_priv->int_crt_support = 1;
 251
 252         general = find_section(bdb, BDB_GENERAL_FEATURES);
 253         if (general) {
 254                 dev_priv->int_tv_support = general->int_tv_support;
 255                 dev_priv->int_crt_support = general->int_crt_support;
 256                 dev_priv->lvds_use_ssc = general->enable_ssc;
 257
 258                 if (dev_priv->lvds_use_ssc) {
 259                         if (IS_I85X(dev_priv->dev))
 260                                 dev_priv->lvds_ssc_freq =
 261                                         general->ssc_freq ? 66 : 48;
 262                         else if (IS_IRONLAKE(dev_priv->dev))
 263                                 dev_priv->lvds_ssc_freq =
 264                                         general->ssc_freq ? 100 : 120;
 265                         else
 266                                 dev_priv->lvds_ssc_freq =
 267                                         general->ssc_freq ? 100 : 96;
 268                 }
 269         }
 270 }
 271
 272 static void
 273 parse_general_definitions(struct drm_i915_private *dev_priv,
 274                           struct bdb_header *bdb)
 275 {
 276         struct bdb_general_definitions *general;
 277         const int crt_bus_map_table[] = {
 278                 GPIOB,
 279                 GPIOA,
 280                 GPIOC,
 281                 GPIOD,
 282                 GPIOE,
 283                 GPIOF,
 284         };
 285
 286         general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 287         if (general) {
 288                 u16 block_size = get_blocksize(general);
 289                 if (block_size >= sizeof(*general)) {
 290                         int bus_pin = general->crt_ddc_gmbus_pin;
 291                         DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
 292                         if ((bus_pin >= 1) && (bus_pin <= 6)) {
 293                                 dev_priv->crt_ddc_bus =
 294                                         crt_bus_map_table[bus_pin-1];
 295                         }
 296                 } else {
 297                         DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
 298                                   block_size);
 299                 }
 300         }
 301 }
 302
 303 static void
 304 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
 305                        struct bdb_header *bdb)
 306 {
 307         struct sdvo_device_mapping *p_mapping;
 308         struct bdb_general_definitions *p_defs;
 309         struct child_device_config *p_child;
 310         int i, child_device_num, count;
 311         u16     block_size;
 312
 313         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 314         if (!p_defs) {
 315                 DRM_DEBUG_KMS("No general definition block is found\n");
 316                 return;
 317         }
 318         /* judge whether the size of child device meets the requirements.
 319          * If the child device size obtained from general definition block
 320          * is different with sizeof(struct child_device_config), skip the
 321          * parsing of sdvo device info
 322          */
 323         if (p_defs->child_dev_size != sizeof(*p_child)) {
 324                 /* different child dev size . Ignore it */
 325                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 326                 return;
 327         }
 328         /* get the block size of general definitions */
 329         block_size = get_blocksize(p_defs);
 330         /* get the number of child device */
 331         child_device_num = (block_size - sizeof(*p_defs)) /
 332                                 sizeof(*p_child);
 333         count = 0;
 334         for (i = 0; i < child_device_num; i++) {
 335                 p_child = &(p_defs->devices[i]);
 336                 if (!p_child->device_type) {
 337                         /* skip the device block if device type is invalid */
 338                         continue;
 339                 }
 340                 if (p_child->slave_addr != SLAVE_ADDR1 &&
 341                         p_child->slave_addr != SLAVE_ADDR2) {
 342                         /*
 343                          * If the slave address is neither 0x70 nor 0x72,
 344                          * it is not a SDVO device. Skip it.
 345                          */
 346                         continue;
 347                 }
 348                 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
 349                         p_child->dvo_port != DEVICE_PORT_DVOC) {
 350                         /* skip the incorrect SDVO port */
 351                         DRM_DEBUG_KMS("Incorrect SDVO port. Skip it \n");
 352                         continue;
 353                 }
 354                 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
 355                                 " %s port\n",
 356                                 p_child->slave_addr,
 357                                 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
 358                                         "SDVOB" : "SDVOC");
 359                 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
 360                 if (!p_mapping->initialized) {
 361                         p_mapping->dvo_port = p_child->dvo_port;
 362                         p_mapping->slave_addr = p_child->slave_addr;
 363                         p_mapping->dvo_wiring = p_child->dvo_wiring;
 364                         p_mapping->initialized = 1;
 365                 } else {
 366                         DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
 367                                          "two SDVO device.\n");
 368                 }
 369                 if (p_child->slave2_addr) {
 370                         /* Maybe this is a SDVO device with multiple inputs */
 371                         /* And the mapping info is not added */
 372                         DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
 373                                 " is a SDVO device with multiple inputs.\n");
 374                 }
 375                 count++;
 376         }
 377
 378         if (!count) {
 379                 /* No SDVO device info is found */
 380                 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
 381         }
 382         return;
 383 }
 384
 385 static void
 386 parse_driver_features(struct drm_i915_private *dev_priv,
 387                        struct bdb_header *bdb)
 388 {
 389         struct drm_device *dev = dev_priv->dev;
 390         struct bdb_driver_features *driver;
 391
 392         driver = find_section(bdb, BDB_DRIVER_FEATURES);
 393         if (!driver)
 394                 return;
 395
 396         if (driver && SUPPORTS_EDP(dev) &&
 397             driver->lvds_config == BDB_DRIVER_FEATURE_EDP) {
 398                 dev_priv->edp_support = 1;
 399         } else {
 400                 dev_priv->edp_support = 0;
 401         }
 402
 403         if (driver && driver->dual_frequency)
 404                 dev_priv->render_reclock_avail = true;
 405 }
 406
 407 static void
 408 parse_device_mapping(struct drm_i915_private *dev_priv,
 409                        struct bdb_header *bdb)
 410 {
 411         struct bdb_general_definitions *p_defs;
 412         struct child_device_config *p_child, *child_dev_ptr;
 413         int i, child_device_num, count;
 414         u16     block_size;
 415
 416         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 417         if (!p_defs) {
 418                 DRM_DEBUG_KMS("No general definition block is found\n");
 419                 return;
 420         }
 421         /* judge whether the size of child device meets the requirements.
 422          * If the child device size obtained from general definition block
 423          * is different with sizeof(struct child_device_config), skip the
 424          * parsing of sdvo device info
 425          */
 426         if (p_defs->child_dev_size != sizeof(*p_child)) {
 427                 /* different child dev size . Ignore it */
 428                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 429                 return;
 430         }
 431         /* get the block size of general definitions */
 432         block_size = get_blocksize(p_defs);
 433         /* get the number of child device */
 434         child_device_num = (block_size - sizeof(*p_defs)) /
 435                                 sizeof(*p_child);
 436         count = 0;
 437         /* get the number of child device that is present */
 438         for (i = 0; i < child_device_num; i++) {
 439                 p_child = &(p_defs->devices[i]);
 440                 if (!p_child->device_type) {
 441                         /* skip the device block if device type is invalid */
 442                         continue;
 443                 }
 444                 count++;
 445         }
 446         if (!count) {
 447                 DRM_DEBUG_KMS("no child dev is parsed from VBT \n");
 448                 return;
 449         }
 450         dev_priv->child_dev = kzalloc(sizeof(*p_child) * count, GFP_KERNEL);
 451         if (!dev_priv->child_dev) {
 452                 DRM_DEBUG_KMS("No memory space for child device\n");
 453                 return;
 454         }
 455
 456         dev_priv->child_dev_num = count;
 457         count = 0;
 458         for (i = 0; i < child_device_num; i++) {
 459                 p_child = &(p_defs->devices[i]);
 460                 if (!p_child->device_type) {
 461                         /* skip the device block if device type is invalid */
 462                         continue;
 463                 }
 464                 child_dev_ptr = dev_priv->child_dev + count;
 465                 count++;
 466                 memcpy((void *)child_dev_ptr, (void *)p_child,
 467                                         sizeof(*p_child));
 468         }
 469         return;
 470 }
 471 /**
 472  * intel_init_bios - initialize VBIOS settings & find VBT
 473  * @dev: DRM device
 474  *
 475  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
 476  * to appropriate values.
 477  *
 478  * VBT existence is a sanity check that is relied on by other i830_bios.c code.
 479  * Note that it would be better to use a BIOS call to get the VBT, as BIOSes may
 480  * feed an updated VBT back through that, compared to what we'll fetch using
 481  * this method of groping around in the BIOS data.
 482  *
 483  * Returns 0 on success, nonzero on failure.
 484  */
 485 bool
 486 intel_init_bios(struct drm_device *dev)
 487 {
 488         struct drm_i915_private *dev_priv = dev->dev_private;
 489         struct pci_dev *pdev = dev->pdev;
 490         struct vbt_header *vbt = NULL;
 491         struct bdb_header *bdb;
 492         u8 __iomem *bios;
 493         size_t size;
 494         int i;
 495
 496         bios = pci_map_rom(pdev, &size);
 497         if (!bios)
 498                 return -1;
 499
 500         /* Scour memory looking for the VBT signature */
 501         for (i = 0; i + 4 < size; i++) {
 502                 if (!memcmp(bios + i, "$VBT", 4)) {
 503                         vbt = (struct vbt_header *)(bios + i);
 504                         break;
 505                 }
 506         }
 507
 508         if (!vbt) {
 509                 DRM_ERROR("VBT signature missing\n");
 510                 pci_unmap_rom(pdev, bios);
 511                 return -1;
 512         }
 513
 514         bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
 515
 516         /* Grab useful general definitions */
 517         parse_general_features(dev_priv, bdb);
 518         parse_general_definitions(dev_priv, bdb);
 519         parse_lfp_panel_data(dev_priv, bdb);
 520         parse_sdvo_panel_data(dev_priv, bdb);
 521         parse_sdvo_device_mapping(dev_priv, bdb);
 522         parse_device_mapping(dev_priv, bdb);
 523         parse_driver_features(dev_priv, bdb);
 524
 525         pci_unmap_rom(pdev, bios);
 526
 527         return 0;
 528 }