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
 118         /* Defaults if we can't find VBT info */
 119         dev_priv->lvds_dither = 0;
 120         dev_priv->lvds_vbt = 0;
 121
 122         lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
 123         if (!lvds_options)
 124                 return;
 125
 126         dev_priv->lvds_dither = lvds_options->pixel_dither;
 127         if (lvds_options->panel_type == 0xff)
 128                 return;
 129
 130         lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
 131         if (!lvds_lfp_data)
 132                 return;
 133
 134         lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
 135         if (!lvds_lfp_data_ptrs)
 136                 return;
 137
 138         dev_priv->lvds_vbt = 1;
 139
 140         lfp_data_size = lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
 141                 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
 142         entry = (struct bdb_lvds_lfp_data_entry *)
 143                 ((uint8_t *)lvds_lfp_data->data + (lfp_data_size *
 144                                                    lvds_options->panel_type));
 145         dvo_timing_offset = lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset -
 146                 lvds_lfp_data_ptrs->ptr[0].fp_timing_offset;
 147
 148         /*
 149          * the size of fp_timing varies on the different platform.
 150          * So calculate the DVO timing relative offset in LVDS data
 151          * entry to get the DVO timing entry
 152          */
 153         dvo_timing = (struct lvds_dvo_timing *)
 154                         ((unsigned char *)entry + dvo_timing_offset);
 155
 156         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 157
 158         fill_detail_timing_data(panel_fixed_mode, dvo_timing);
 159
 160         dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
 161
 162         DRM_DEBUG("Found panel mode in BIOS VBT tables:\n");
 163         drm_mode_debug_printmodeline(panel_fixed_mode);
 164
 165         return;
 166 }
 167
 168 /* Try to find sdvo panel data */
 169 static void
 170 parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
 171                       struct bdb_header *bdb)
 172 {
 173         struct bdb_sdvo_lvds_options *sdvo_lvds_options;
 174         struct lvds_dvo_timing *dvo_timing;
 175         struct drm_display_mode *panel_fixed_mode;
 176
 177         dev_priv->sdvo_lvds_vbt_mode = NULL;
 178
 179         sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
 180         if (!sdvo_lvds_options)
 181                 return;
 182
 183         dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
 184         if (!dvo_timing)
 185                 return;
 186
 187         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 188
 189         if (!panel_fixed_mode)
 190                 return;
 191
 192         fill_detail_timing_data(panel_fixed_mode,
 193                         dvo_timing + sdvo_lvds_options->panel_type);
 194
 195         dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
 196
 197         return;
 198 }
 199
 200 static void
 201 parse_general_features(struct drm_i915_private *dev_priv,
 202                        struct bdb_header *bdb)
 203 {
 204         struct bdb_general_features *general;
 205
 206         /* Set sensible defaults in case we can't find the general block */
 207         dev_priv->int_tv_support = 1;
 208         dev_priv->int_crt_support = 1;
 209
 210         general = find_section(bdb, BDB_GENERAL_FEATURES);
 211         if (general) {
 212                 dev_priv->int_tv_support = general->int_tv_support;
 213                 dev_priv->int_crt_support = general->int_crt_support;
 214                 dev_priv->lvds_use_ssc = general->enable_ssc;
 215
 216                 if (dev_priv->lvds_use_ssc) {
 217                         if (IS_I85X(dev_priv->dev))
 218                                 dev_priv->lvds_ssc_freq =
 219                                         general->ssc_freq ? 66 : 48;
 220                         else
 221                                 dev_priv->lvds_ssc_freq =
 222                                         general->ssc_freq ? 100 : 96;
 223                 }
 224         }
 225 }
 226
 227 static void
 228 parse_general_definitions(struct drm_i915_private *dev_priv,
 229                           struct bdb_header *bdb)
 230 {
 231         struct bdb_general_definitions *general;
 232         const int crt_bus_map_table[] = {
 233                 GPIOB,
 234                 GPIOA,
 235                 GPIOC,
 236                 GPIOD,
 237                 GPIOE,
 238                 GPIOF,
 239         };
 240
 241         /* Set sensible defaults in case we can't find the general block
 242            or it is the wrong chipset */
 243         dev_priv->crt_ddc_bus = -1;
 244
 245         general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 246         if (general) {
 247                 u16 block_size = get_blocksize(general);
 248                 if (block_size >= sizeof(*general)) {
 249                         int bus_pin = general->crt_ddc_gmbus_pin;
 250                         DRM_DEBUG("crt_ddc_bus_pin: %d\n", bus_pin);
 251                         if ((bus_pin >= 1) && (bus_pin <= 6)) {
 252                                 dev_priv->crt_ddc_bus =
 253                                         crt_bus_map_table[bus_pin-1];
 254                         }
 255                 } else {
 256                         DRM_DEBUG("BDB_GD too small (%d). Invalid.\n",
 257                                   block_size);
 258                 }
 259         }
 260 }
 261
 262 static void
 263 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
 264                        struct bdb_header *bdb)
 265 {
 266         struct sdvo_device_mapping *p_mapping;
 267         struct bdb_general_definitions *p_defs;
 268         struct child_device_config *p_child;
 269         int i, child_device_num, count;
 270         u16     block_size;
 271
 272         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 273         if (!p_defs) {
 274                 DRM_DEBUG("No general definition block is found\n");
 275                 return;
 276         }
 277         /* judge whether the size of child device meets the requirements.
 278          * If the child device size obtained from general definition block
 279          * is different with sizeof(struct child_device_config), skip the
 280          * parsing of sdvo device info
 281          */
 282         if (p_defs->child_dev_size != sizeof(*p_child)) {
 283                 /* different child dev size . Ignore it */
 284                 DRM_DEBUG("different child size is found. Invalid.\n");
 285                 return;
 286         }
 287         /* get the block size of general definitions */
 288         block_size = get_blocksize(p_defs);
 289         /* get the number of child device */
 290         child_device_num = (block_size - sizeof(*p_defs)) /
 291                                 sizeof(*p_child);
 292         count = 0;
 293         for (i = 0; i < child_device_num; i++) {
 294                 p_child = &(p_defs->devices[i]);
 295                 if (!p_child->device_type) {
 296                         /* skip the device block if device type is invalid */
 297                         continue;
 298                 }
 299                 if (p_child->slave_addr != SLAVE_ADDR1 &&
 300                         p_child->slave_addr != SLAVE_ADDR2) {
 301                         /*
 302                          * If the slave address is neither 0x70 nor 0x72,
 303                          * it is not a SDVO device. Skip it.
 304                          */
 305                         continue;
 306                 }
 307                 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
 308                         p_child->dvo_port != DEVICE_PORT_DVOC) {
 309                         /* skip the incorrect SDVO port */
 310                         DRM_DEBUG("Incorrect SDVO port. Skip it \n");
 311                         continue;
 312                 }
 313                 DRM_DEBUG("the SDVO device with slave addr %2x is found on "
 314                                 "%s port\n",
 315                                 p_child->slave_addr,
 316                                 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
 317                                         "SDVOB" : "SDVOC");
 318                 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
 319                 if (!p_mapping->initialized) {
 320                         p_mapping->dvo_port = p_child->dvo_port;
 321                         p_mapping->slave_addr = p_child->slave_addr;
 322                         p_mapping->dvo_wiring = p_child->dvo_wiring;
 323                         p_mapping->initialized = 1;
 324                 } else {
 325                         DRM_DEBUG("Maybe one SDVO port is shared by "
 326                                          "two SDVO device.\n");
 327                 }
 328                 if (p_child->slave2_addr) {
 329                         /* Maybe this is a SDVO device with multiple inputs */
 330                         /* And the mapping info is not added */
 331                         DRM_DEBUG("there exists the slave2_addr. Maybe this "
 332                                 "is a SDVO device with multiple inputs.\n");
 333                 }
 334                 count++;
 335         }
 336
 337         if (!count) {
 338                 /* No SDVO device info is found */
 339                 DRM_DEBUG("No SDVO device info is found in VBT\n");
 340         }
 341         return;
 342 }
 343
 344 static void
 345 parse_driver_features(struct drm_i915_private *dev_priv,
 346                        struct bdb_header *bdb)
 347 {
 348         struct drm_device *dev = dev_priv->dev;
 349         struct bdb_driver_features *driver;
 350
 351         /* set default for chips without eDP */
 352         if (!SUPPORTS_EDP(dev)) {
 353                 dev_priv->edp_support = 0;
 354                 return;
 355         }
 356
 357         driver = find_section(bdb, BDB_DRIVER_FEATURES);
 358         if (driver && driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
 359                 dev_priv->edp_support = 1;
 360 }
 361
 362 /**
 363  * intel_init_bios - initialize VBIOS settings & find VBT
 364  * @dev: DRM device
 365  *
 366  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
 367  * to appropriate values.
 368  *
 369  * VBT existence is a sanity check that is relied on by other i830_bios.c code.
 370  * Note that it would be better to use a BIOS call to get the VBT, as BIOSes may
 371  * feed an updated VBT back through that, compared to what we'll fetch using
 372  * this method of groping around in the BIOS data.
 373  *
 374  * Returns 0 on success, nonzero on failure.
 375  */
 376 bool
 377 intel_init_bios(struct drm_device *dev)
 378 {
 379         struct drm_i915_private *dev_priv = dev->dev_private;
 380         struct pci_dev *pdev = dev->pdev;
 381         struct vbt_header *vbt = NULL;
 382         struct bdb_header *bdb;
 383         u8 __iomem *bios;
 384         size_t size;
 385         int i;
 386
 387         bios = pci_map_rom(pdev, &size);
 388         if (!bios)
 389                 return -1;
 390
 391         /* Scour memory looking for the VBT signature */
 392         for (i = 0; i + 4 < size; i++) {
 393                 if (!memcmp(bios + i, "$VBT", 4)) {
 394                         vbt = (struct vbt_header *)(bios + i);
 395                         break;
 396                 }
 397         }
 398
 399         if (!vbt) {
 400                 DRM_ERROR("VBT signature missing\n");
 401                 pci_unmap_rom(pdev, bios);
 402                 return -1;
 403         }
 404
 405         bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
 406
 407         /* Grab useful general definitions */
 408         parse_general_features(dev_priv, bdb);
 409         parse_general_definitions(dev_priv, bdb);
 410         parse_lfp_panel_data(dev_priv, bdb);
 411         parse_sdvo_panel_data(dev_priv, bdb);
 412         parse_sdvo_device_mapping(dev_priv, bdb);
 413         parse_driver_features(dev_priv, bdb);
 414
 415         pci_unmap_rom(pdev, bios);
 416
 417         return 0;
 418 }