drivers/gpu/drm/gma500/intel_bios.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2006 Intel Corporation
   4  *
   5  * Authors:
   6  *    Eric Anholt <eric@anholt.net>
   7  */
   8
   9 #include <drm/display/drm_dp_helper.h>
  10 #include <drm/drm.h>
  11
  12 #include "intel_bios.h"
  13 #include "psb_drv.h"
  14 #include "psb_intel_drv.h"
  15 #include "psb_intel_reg.h"
  16
  17 #define SLAVE_ADDR1     0x70
  18 #define SLAVE_ADDR2     0x72
  19
  20 static void *find_section(struct bdb_header *bdb, int section_id)
  21 {
  22         u8 *base = (u8 *)bdb;
  23         int index = 0;
  24         u16 total, current_size;
  25         u8 current_id;
  26
  27         /* skip to first section */
  28         index += bdb->header_size;
  29         total = bdb->bdb_size;
  30
  31         /* walk the sections looking for section_id */
  32         while (index < total) {
  33                 current_id = *(base + index);
  34                 index++;
  35                 current_size = *((u16 *)(base + index));
  36                 index += 2;
  37                 if (current_id == section_id)
  38                         return base + index;
  39                 index += current_size;
  40         }
  41
  42         return NULL;
  43 }
  44
  45 static void
  46 parse_edp(struct drm_psb_private *dev_priv, struct bdb_header *bdb)
  47 {
  48         struct bdb_edp *edp;
  49         struct edp_power_seq *edp_pps;
  50         struct edp_link_params *edp_link_params;
  51         uint8_t panel_type;
  52
  53         edp = find_section(bdb, BDB_EDP);
  54
  55         dev_priv->edp.bpp = 18;
  56         if (!edp) {
  57                 if (dev_priv->edp.support) {
  58                         DRM_DEBUG_KMS("No eDP BDB found but eDP panel supported, assume %dbpp panel color depth.\n",
  59                                       dev_priv->edp.bpp);
  60                 }
  61                 return;
  62         }
  63
  64         panel_type = dev_priv->panel_type;
  65         switch ((edp->color_depth >> (panel_type * 2)) & 3) {
  66         case EDP_18BPP:
  67                 dev_priv->edp.bpp = 18;
  68                 break;
  69         case EDP_24BPP:
  70                 dev_priv->edp.bpp = 24;
  71                 break;
  72         case EDP_30BPP:
  73                 dev_priv->edp.bpp = 30;
  74                 break;
  75         }
  76
  77         /* Get the eDP sequencing and link info */
  78         edp_pps = &edp->power_seqs[panel_type];
  79         edp_link_params = &edp->link_params[panel_type];
  80
  81         dev_priv->edp.pps = *edp_pps;
  82
  83         DRM_DEBUG_KMS("EDP timing in vbt t1_t3 %d t8 %d t9 %d t10 %d t11_t12 %d\n",
  84                                 dev_priv->edp.pps.t1_t3, dev_priv->edp.pps.t8,
  85                                 dev_priv->edp.pps.t9, dev_priv->edp.pps.t10,
  86                                 dev_priv->edp.pps.t11_t12);
  87
  88         dev_priv->edp.rate = edp_link_params->rate ? DP_LINK_BW_2_7 :
  89                 DP_LINK_BW_1_62;
  90         switch (edp_link_params->lanes) {
  91         case 0:
  92                 dev_priv->edp.lanes = 1;
  93                 break;
  94         case 1:
  95                 dev_priv->edp.lanes = 2;
  96                 break;
  97         case 3:
  98         default:
  99                 dev_priv->edp.lanes = 4;
 100                 break;
 101         }
 102         DRM_DEBUG_KMS("VBT reports EDP: Lane_count %d, Lane_rate %d, Bpp %d\n",
 103                         dev_priv->edp.lanes, dev_priv->edp.rate, dev_priv->edp.bpp);
 104
 105         switch (edp_link_params->preemphasis) {
 106         case 0:
 107                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_0;
 108                 break;
 109         case 1:
 110                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_1;
 111                 break;
 112         case 2:
 113                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_2;
 114                 break;
 115         case 3:
 116                 dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPH_LEVEL_3;
 117                 break;
 118         }
 119         switch (edp_link_params->vswing) {
 120         case 0:
 121                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_0;
 122                 break;
 123         case 1:
 124                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_1;
 125                 break;
 126         case 2:
 127                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_2;
 128                 break;
 129         case 3:
 130                 dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_LEVEL_3;
 131                 break;
 132         }
 133         DRM_DEBUG_KMS("VBT reports EDP: VSwing  %d, Preemph %d\n",
 134                         dev_priv->edp.vswing, dev_priv->edp.preemphasis);
 135 }
 136
 137 static u16
 138 get_blocksize(void *p)
 139 {
 140         u16 *block_ptr, block_size;
 141
 142         block_ptr = (u16 *)((char *)p - 2);
 143         block_size = *block_ptr;
 144         return block_size;
 145 }
 146
 147 static void fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
 148                         struct lvds_dvo_timing *dvo_timing)
 149 {
 150         panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
 151                 dvo_timing->hactive_lo;
 152         panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
 153                 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
 154         panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
 155                 dvo_timing->hsync_pulse_width;
 156         panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
 157                 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
 158
 159         panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
 160                 dvo_timing->vactive_lo;
 161         panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
 162                 dvo_timing->vsync_off;
 163         panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
 164                 dvo_timing->vsync_pulse_width;
 165         panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
 166                 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
 167         panel_fixed_mode->clock = dvo_timing->clock * 10;
 168         panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
 169
 170         if (dvo_timing->hsync_positive)
 171                 panel_fixed_mode->flags |= DRM_MODE_FLAG_PHSYNC;
 172         else
 173                 panel_fixed_mode->flags |= DRM_MODE_FLAG_NHSYNC;
 174
 175         if (dvo_timing->vsync_positive)
 176                 panel_fixed_mode->flags |= DRM_MODE_FLAG_PVSYNC;
 177         else
 178                 panel_fixed_mode->flags |= DRM_MODE_FLAG_NVSYNC;
 179
 180         /* Some VBTs have bogus h/vtotal values */
 181         if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
 182                 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
 183         if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
 184                 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
 185
 186         drm_mode_set_name(panel_fixed_mode);
 187 }
 188
 189 static void parse_backlight_data(struct drm_psb_private *dev_priv,
 190                                 struct bdb_header *bdb)
 191 {
 192         struct bdb_lvds_backlight *vbt_lvds_bl = NULL;
 193         struct bdb_lvds_backlight *lvds_bl;
 194         u8 p_type = 0;
 195         void *bl_start = NULL;
 196         struct bdb_lvds_options *lvds_opts
 197                                 = find_section(bdb, BDB_LVDS_OPTIONS);
 198
 199         dev_priv->lvds_bl = NULL;
 200
 201         if (lvds_opts)
 202                 p_type = lvds_opts->panel_type;
 203         else
 204                 return;
 205
 206         bl_start = find_section(bdb, BDB_LVDS_BACKLIGHT);
 207         vbt_lvds_bl = (struct bdb_lvds_backlight *)(bl_start + 1) + p_type;
 208
 209         lvds_bl = kmemdup(vbt_lvds_bl, sizeof(*vbt_lvds_bl), GFP_KERNEL);
 210         if (!lvds_bl) {
 211                 dev_err(dev_priv->dev.dev, "out of memory for backlight data\n");
 212                 return;
 213         }
 214         dev_priv->lvds_bl = lvds_bl;
 215 }
 216
 217 /* Try to find integrated panel data */
 218 static void parse_lfp_panel_data(struct drm_psb_private *dev_priv,
 219                             struct bdb_header *bdb)
 220 {
 221         struct bdb_lvds_options *lvds_options;
 222         struct bdb_lvds_lfp_data *lvds_lfp_data;
 223         struct bdb_lvds_lfp_data_entry *entry;
 224         struct lvds_dvo_timing *dvo_timing;
 225         struct drm_display_mode *panel_fixed_mode;
 226
 227         /* Defaults if we can't find VBT info */
 228         dev_priv->lvds_dither = 0;
 229         dev_priv->lvds_vbt = 0;
 230
 231         lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
 232         if (!lvds_options)
 233                 return;
 234
 235         dev_priv->lvds_dither = lvds_options->pixel_dither;
 236         dev_priv->panel_type = lvds_options->panel_type;
 237
 238         if (lvds_options->panel_type == 0xff)
 239                 return;
 240
 241         lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
 242         if (!lvds_lfp_data)
 243                 return;
 244
 245
 246         entry = &lvds_lfp_data->data[lvds_options->panel_type];
 247         dvo_timing = &entry->dvo_timing;
 248
 249         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode),
 250                                       GFP_KERNEL);
 251         if (panel_fixed_mode == NULL) {
 252                 dev_err(dev_priv->dev.dev, "out of memory for fixed panel mode\n");
 253                 return;
 254         }
 255
 256         dev_priv->lvds_vbt = 1;
 257         fill_detail_timing_data(panel_fixed_mode, dvo_timing);
 258
 259         if (panel_fixed_mode->htotal > 0 && panel_fixed_mode->vtotal > 0) {
 260                 dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
 261                 drm_mode_debug_printmodeline(panel_fixed_mode);
 262         } else {
 263                 dev_dbg(dev_priv->dev.dev, "ignoring invalid LVDS VBT\n");
 264                 dev_priv->lvds_vbt = 0;
 265                 kfree(panel_fixed_mode);
 266         }
 267         return;
 268 }
 269
 270 /* Try to find sdvo panel data */
 271 static void parse_sdvo_panel_data(struct drm_psb_private *dev_priv,
 272                       struct bdb_header *bdb)
 273 {
 274         struct bdb_sdvo_lvds_options *sdvo_lvds_options;
 275         struct lvds_dvo_timing *dvo_timing;
 276         struct drm_display_mode *panel_fixed_mode;
 277
 278         dev_priv->sdvo_lvds_vbt_mode = NULL;
 279
 280         sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
 281         if (!sdvo_lvds_options)
 282                 return;
 283
 284         dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
 285         if (!dvo_timing)
 286                 return;
 287
 288         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 289
 290         if (!panel_fixed_mode)
 291                 return;
 292
 293         fill_detail_timing_data(panel_fixed_mode,
 294                         dvo_timing + sdvo_lvds_options->panel_type);
 295
 296         dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
 297
 298         return;
 299 }
 300
 301 static void parse_general_features(struct drm_psb_private *dev_priv,
 302                        struct bdb_header *bdb)
 303 {
 304         struct bdb_general_features *general;
 305
 306         /* Set sensible defaults in case we can't find the general block */
 307         dev_priv->int_tv_support = 1;
 308         dev_priv->int_crt_support = 1;
 309
 310         general = find_section(bdb, BDB_GENERAL_FEATURES);
 311         if (general) {
 312                 dev_priv->int_tv_support = general->int_tv_support;
 313                 dev_priv->int_crt_support = general->int_crt_support;
 314                 dev_priv->lvds_use_ssc = general->enable_ssc;
 315
 316                 if (dev_priv->lvds_use_ssc) {
 317                         dev_priv->lvds_ssc_freq
 318                                 = general->ssc_freq ? 100 : 96;
 319                 }
 320         }
 321 }
 322
 323 static void
 324 parse_sdvo_device_mapping(struct drm_psb_private *dev_priv,
 325                           struct bdb_header *bdb)
 326 {
 327         struct sdvo_device_mapping *p_mapping;
 328         struct bdb_general_definitions *p_defs;
 329         struct child_device_config *p_child;
 330         int i, child_device_num, count;
 331         u16     block_size;
 332
 333         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 334         if (!p_defs) {
 335                 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
 336                 return;
 337         }
 338         /* judge whether the size of child device meets the requirements.
 339          * If the child device size obtained from general definition block
 340          * is different with sizeof(struct child_device_config), skip the
 341          * parsing of sdvo device info
 342          */
 343         if (p_defs->child_dev_size != sizeof(*p_child)) {
 344                 /* different child dev size . Ignore it */
 345                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 346                 return;
 347         }
 348         /* get the block size of general definitions */
 349         block_size = get_blocksize(p_defs);
 350         /* get the number of child device */
 351         child_device_num = (block_size - sizeof(*p_defs)) /
 352                                 sizeof(*p_child);
 353         count = 0;
 354         for (i = 0; i < child_device_num; i++) {
 355                 p_child = &(p_defs->devices[i]);
 356                 if (!p_child->device_type) {
 357                         /* skip the device block if device type is invalid */
 358                         continue;
 359                 }
 360                 if (p_child->slave_addr != SLAVE_ADDR1 &&
 361                         p_child->slave_addr != SLAVE_ADDR2) {
 362                         /*
 363                          * If the slave address is neither 0x70 nor 0x72,
 364                          * it is not a SDVO device. Skip it.
 365                          */
 366                         continue;
 367                 }
 368                 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
 369                         p_child->dvo_port != DEVICE_PORT_DVOC) {
 370                         /* skip the incorrect SDVO port */
 371                         DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n");
 372                         continue;
 373                 }
 374                 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
 375                                 " %s port\n",
 376                                 p_child->slave_addr,
 377                                 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
 378                                         "SDVOB" : "SDVOC");
 379                 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
 380                 if (!p_mapping->initialized) {
 381                         p_mapping->dvo_port = p_child->dvo_port;
 382                         p_mapping->slave_addr = p_child->slave_addr;
 383                         p_mapping->dvo_wiring = p_child->dvo_wiring;
 384                         p_mapping->ddc_pin = p_child->ddc_pin;
 385                         p_mapping->i2c_pin = p_child->i2c_pin;
 386                         p_mapping->initialized = 1;
 387                         DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n",
 388                                       p_mapping->dvo_port,
 389                                       p_mapping->slave_addr,
 390                                       p_mapping->dvo_wiring,
 391                                       p_mapping->ddc_pin,
 392                                       p_mapping->i2c_pin);
 393                 } else {
 394                         DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
 395                                          "two SDVO device.\n");
 396                 }
 397                 if (p_child->slave2_addr) {
 398                         /* Maybe this is a SDVO device with multiple inputs */
 399                         /* And the mapping info is not added */
 400                         DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
 401                                 " is a SDVO device with multiple inputs.\n");
 402                 }
 403                 count++;
 404         }
 405
 406         if (!count) {
 407                 /* No SDVO device info is found */
 408                 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
 409         }
 410         return;
 411 }
 412
 413
 414 static void
 415 parse_driver_features(struct drm_psb_private *dev_priv,
 416                       struct bdb_header *bdb)
 417 {
 418         struct bdb_driver_features *driver;
 419
 420         driver = find_section(bdb, BDB_DRIVER_FEATURES);
 421         if (!driver)
 422                 return;
 423
 424         if (driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
 425                 dev_priv->edp.support = 1;
 426
 427         dev_priv->lvds_enabled_in_vbt = driver->lvds_config != 0;
 428         DRM_DEBUG_KMS("LVDS VBT config bits: 0x%x\n", driver->lvds_config);
 429
 430         /* This bit means to use 96Mhz for DPLL_A or not */
 431         if (driver->primary_lfp_id)
 432                 dev_priv->dplla_96mhz = true;
 433         else
 434                 dev_priv->dplla_96mhz = false;
 435 }
 436
 437 static void
 438 parse_device_mapping(struct drm_psb_private *dev_priv,
 439                        struct bdb_header *bdb)
 440 {
 441         struct bdb_general_definitions *p_defs;
 442         struct child_device_config *p_child, *child_dev_ptr;
 443         int i, child_device_num, count;
 444         u16     block_size;
 445
 446         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 447         if (!p_defs) {
 448                 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
 449                 return;
 450         }
 451         /* judge whether the size of child device meets the requirements.
 452          * If the child device size obtained from general definition block
 453          * is different with sizeof(struct child_device_config), skip the
 454          * parsing of sdvo device info
 455          */
 456         if (p_defs->child_dev_size != sizeof(*p_child)) {
 457                 /* different child dev size . Ignore it */
 458                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 459                 return;
 460         }
 461         /* get the block size of general definitions */
 462         block_size = get_blocksize(p_defs);
 463         /* get the number of child device */
 464         child_device_num = (block_size - sizeof(*p_defs)) /
 465                                 sizeof(*p_child);
 466         count = 0;
 467         /* get the number of child devices that are present */
 468         for (i = 0; i < child_device_num; i++) {
 469                 p_child = &(p_defs->devices[i]);
 470                 if (!p_child->device_type) {
 471                         /* skip the device block if device type is invalid */
 472                         continue;
 473                 }
 474                 count++;
 475         }
 476         if (!count) {
 477                 DRM_DEBUG_KMS("no child dev is parsed from VBT\n");
 478                 return;
 479         }
 480         dev_priv->child_dev = kcalloc(count, sizeof(*p_child), GFP_KERNEL);
 481         if (!dev_priv->child_dev) {
 482                 DRM_DEBUG_KMS("No memory space for child devices\n");
 483                 return;
 484         }
 485
 486         dev_priv->child_dev_num = count;
 487         count = 0;
 488         for (i = 0; i < child_device_num; i++) {
 489                 p_child = &(p_defs->devices[i]);
 490                 if (!p_child->device_type) {
 491                         /* skip the device block if device type is invalid */
 492                         continue;
 493                 }
 494                 child_dev_ptr = dev_priv->child_dev + count;
 495                 count++;
 496                 memcpy((void *)child_dev_ptr, (void *)p_child,
 497                                         sizeof(*p_child));
 498         }
 499         return;
 500 }
 501
 502
 503 /**
 504  * psb_intel_init_bios - initialize VBIOS settings & find VBT
 505  * @dev: DRM device
 506  *
 507  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
 508  * to appropriate values.
 509  *
 510  * VBT existence is a sanity check that is relied on by other i830_bios.c code.
 511  * Note that it would be better to use a BIOS call to get the VBT, as BIOSes may
 512  * feed an updated VBT back through that, compared to what we'll fetch using
 513  * this method of groping around in the BIOS data.
 514  *
 515  * Returns 0 on success, nonzero on failure.
 516  */
 517 int psb_intel_init_bios(struct drm_device *dev)
 518 {
 519         struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 520         struct pci_dev *pdev = to_pci_dev(dev->dev);
 521         struct vbt_header *vbt = NULL;
 522         struct bdb_header *bdb = NULL;
 523         u8 __iomem *bios = NULL;
 524         size_t size;
 525         int i;
 526
 527
 528         dev_priv->panel_type = 0xff;
 529
 530         /* XXX Should this validation be moved to intel_opregion.c? */
 531         if (dev_priv->opregion.vbt) {
 532                 struct vbt_header *vbt = dev_priv->opregion.vbt;
 533                 if (memcmp(vbt->signature, "$VBT", 4) == 0) {
 534                         DRM_DEBUG_KMS("Using VBT from OpRegion: %20s\n",
 535                                          vbt->signature);
 536                         bdb = (struct bdb_header *)((char *)vbt + vbt->bdb_offset);
 537                 } else
 538                         dev_priv->opregion.vbt = NULL;
 539         }
 540
 541         if (bdb == NULL) {
 542                 bios = pci_map_rom(pdev, &size);
 543                 if (!bios)
 544                         return -1;
 545
 546                 /* Scour memory looking for the VBT signature */
 547                 for (i = 0; i + 4 < size; i++) {
 548                         if (!memcmp(bios + i, "$VBT", 4)) {
 549                                 vbt = (struct vbt_header *)(bios + i);
 550                                 break;
 551                         }
 552                 }
 553
 554                 if (!vbt) {
 555                         dev_err(dev->dev, "VBT signature missing\n");
 556                         pci_unmap_rom(pdev, bios);
 557                         return -1;
 558                 }
 559                 bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
 560         }
 561
 562         /* Grab useful general dxefinitions */
 563         parse_general_features(dev_priv, bdb);
 564         parse_driver_features(dev_priv, bdb);
 565         parse_lfp_panel_data(dev_priv, bdb);
 566         parse_sdvo_panel_data(dev_priv, bdb);
 567         parse_sdvo_device_mapping(dev_priv, bdb);
 568         parse_device_mapping(dev_priv, bdb);
 569         parse_backlight_data(dev_priv, bdb);
 570         parse_edp(dev_priv, bdb);
 571
 572         if (bios)
 573                 pci_unmap_rom(pdev, bios);
 574
 575         return 0;
 576 }
 577
 578 /*
 579  * Destroy and free VBT data
 580  */
 581 void psb_intel_destroy_bios(struct drm_device *dev)
 582 {
 583         struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 584
 585         kfree(dev_priv->sdvo_lvds_vbt_mode);
 586         kfree(dev_priv->lfp_lvds_vbt_mode);
 587         kfree(dev_priv->lvds_bl);
 588 }