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 void
  63 fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
  64                         struct lvds_dvo_timing *dvo_timing)
  65 {
  66         panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
  67                 dvo_timing->hactive_lo;
  68         panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
  69                 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
  70         panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
  71                 dvo_timing->hsync_pulse_width;
  72         panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
  73                 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
  74
  75         panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
  76                 dvo_timing->vactive_lo;
  77         panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
  78                 dvo_timing->vsync_off;
  79         panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
  80                 dvo_timing->vsync_pulse_width;
  81         panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
  82                 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
  83         panel_fixed_mode->clock = dvo_timing->clock * 10;
  84         panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
  85
  86         /* Some VBTs have bogus h/vtotal values */
  87         if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
  88                 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
  89         if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
  90                 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
  91
  92         drm_mode_set_name(panel_fixed_mode);
  93 }
  94
  95 /* Try to find integrated panel data */
  96 static void
  97 parse_lfp_panel_data(struct drm_i915_private *dev_priv,
  98                             struct bdb_header *bdb)
  99 {
 100         struct drm_device *dev = dev_priv->dev;
 101         struct bdb_lvds_options *lvds_options;
 102         struct bdb_lvds_lfp_data *lvds_lfp_data;
 103         struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
 104         struct bdb_lvds_lfp_data_entry *entry;
 105         struct lvds_dvo_timing *dvo_timing;
 106         struct drm_display_mode *panel_fixed_mode;
 107         int lfp_data_size;
 108
 109         /* Defaults if we can't find VBT info */
 110         dev_priv->lvds_dither = 0;
 111         dev_priv->lvds_vbt = 0;
 112
 113         lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
 114         if (!lvds_options)
 115                 return;
 116
 117         dev_priv->lvds_dither = lvds_options->pixel_dither;
 118         if (lvds_options->panel_type == 0xff)
 119                 return;
 120
 121         lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
 122         if (!lvds_lfp_data)
 123                 return;
 124
 125         lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
 126         if (!lvds_lfp_data_ptrs)
 127                 return;
 128
 129         dev_priv->lvds_vbt = 1;
 130
 131         lfp_data_size = lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
 132                 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
 133         entry = (struct bdb_lvds_lfp_data_entry *)
 134                 ((uint8_t *)lvds_lfp_data->data + (lfp_data_size *
 135                                                    lvds_options->panel_type));
 136
 137         /* On IGDNG mobile, LVDS data block removes panel fitting registers.
 138            So dec 2 dword from dvo_timing offset */
 139         if (IS_IGDNG(dev))
 140                 dvo_timing = (struct lvds_dvo_timing *)
 141                                         ((u8 *)&entry->dvo_timing - 8);
 142         else
 143                 dvo_timing = &entry->dvo_timing;
 144
 145         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 146
 147         fill_detail_timing_data(panel_fixed_mode, dvo_timing);
 148
 149         dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
 150
 151         DRM_DEBUG("Found panel mode in BIOS VBT tables:\n");
 152         drm_mode_debug_printmodeline(panel_fixed_mode);
 153
 154         return;
 155 }
 156
 157 /* Try to find sdvo panel data */
 158 static void
 159 parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
 160                       struct bdb_header *bdb)
 161 {
 162         struct bdb_sdvo_lvds_options *sdvo_lvds_options;
 163         struct lvds_dvo_timing *dvo_timing;
 164         struct drm_display_mode *panel_fixed_mode;
 165
 166         dev_priv->sdvo_lvds_vbt_mode = NULL;
 167
 168         sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
 169         if (!sdvo_lvds_options)
 170                 return;
 171
 172         dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
 173         if (!dvo_timing)
 174                 return;
 175
 176         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 177
 178         if (!panel_fixed_mode)
 179                 return;
 180
 181         fill_detail_timing_data(panel_fixed_mode,
 182                         dvo_timing + sdvo_lvds_options->panel_type);
 183
 184         dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
 185
 186         return;
 187 }
 188
 189 static void
 190 parse_general_features(struct drm_i915_private *dev_priv,
 191                        struct bdb_header *bdb)
 192 {
 193         struct bdb_general_features *general;
 194
 195         /* Set sensible defaults in case we can't find the general block */
 196         dev_priv->int_tv_support = 1;
 197         dev_priv->int_crt_support = 1;
 198
 199         general = find_section(bdb, BDB_GENERAL_FEATURES);
 200         if (general) {
 201                 dev_priv->int_tv_support = general->int_tv_support;
 202                 dev_priv->int_crt_support = general->int_crt_support;
 203                 dev_priv->lvds_use_ssc = general->enable_ssc;
 204
 205                 if (dev_priv->lvds_use_ssc) {
 206                         if (IS_I85X(dev_priv->dev))
 207                                 dev_priv->lvds_ssc_freq =
 208                                         general->ssc_freq ? 66 : 48;
 209                         else
 210                                 dev_priv->lvds_ssc_freq =
 211                                         general->ssc_freq ? 100 : 96;
 212                 }
 213         }
 214 }
 215
 216 static void
 217 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
 218                        struct bdb_header *bdb)
 219 {
 220         struct sdvo_device_mapping *p_mapping;
 221         struct bdb_general_definitions *p_defs;
 222         struct child_device_config *p_child;
 223         int i, child_device_num, count;
 224         u16     block_size, *block_ptr;
 225
 226         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 227         if (!p_defs) {
 228                 DRM_DEBUG("No general definition block is found\n");
 229                 return;
 230         }
 231         /* judge whether the size of child device meets the requirements.
 232          * If the child device size obtained from general definition block
 233          * is different with sizeof(struct child_device_config), skip the
 234          * parsing of sdvo device info
 235          */
 236         if (p_defs->child_dev_size != sizeof(*p_child)) {
 237                 /* different child dev size . Ignore it */
 238                 DRM_DEBUG("different child size is found. Invalid.\n");
 239                 return;
 240         }
 241         /* get the block size of general definitions */
 242         block_ptr = (u16 *)((char *)p_defs - 2);
 243         block_size = *block_ptr;
 244         /* get the number of child device */
 245         child_device_num = (block_size - sizeof(*p_defs)) /
 246                                 sizeof(*p_child);
 247         count = 0;
 248         for (i = 0; i < child_device_num; i++) {
 249                 p_child = &(p_defs->devices[i]);
 250                 if (!p_child->device_type) {
 251                         /* skip the device block if device type is invalid */
 252                         continue;
 253                 }
 254                 if (p_child->slave_addr != SLAVE_ADDR1 &&
 255                         p_child->slave_addr != SLAVE_ADDR2) {
 256                         /*
 257                          * If the slave address is neither 0x70 nor 0x72,
 258                          * it is not a SDVO device. Skip it.
 259                          */
 260                         continue;
 261                 }
 262                 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
 263                         p_child->dvo_port != DEVICE_PORT_DVOC) {
 264                         /* skip the incorrect SDVO port */
 265                         DRM_DEBUG("Incorrect SDVO port. Skip it \n");
 266                         continue;
 267                 }
 268                 DRM_DEBUG("the SDVO device with slave addr %2x is found on "
 269                                 "%s port\n",
 270                                 p_child->slave_addr,
 271                                 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
 272                                         "SDVOB" : "SDVOC");
 273                 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
 274                 if (!p_mapping->initialized) {
 275                         p_mapping->dvo_port = p_child->dvo_port;
 276                         p_mapping->slave_addr = p_child->slave_addr;
 277                         p_mapping->dvo_wiring = p_child->dvo_wiring;
 278                         p_mapping->initialized = 1;
 279                 } else {
 280                         DRM_DEBUG("Maybe one SDVO port is shared by "
 281                                          "two SDVO device.\n");
 282                 }
 283                 if (p_child->slave2_addr) {
 284                         /* Maybe this is a SDVO device with multiple inputs */
 285                         /* And the mapping info is not added */
 286                         DRM_DEBUG("there exists the slave2_addr. Maybe this "
 287                                 "is a SDVO device with multiple inputs.\n");
 288                 }
 289                 count++;
 290         }
 291
 292         if (!count) {
 293                 /* No SDVO device info is found */
 294                 DRM_DEBUG("No SDVO device info is found in VBT\n");
 295         }
 296         return;
 297 }
 298 /**
 299  * intel_init_bios - initialize VBIOS settings & find VBT
 300  * @dev: DRM device
 301  *
 302  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
 303  * to appropriate values.
 304  *
 305  * VBT existence is a sanity check that is relied on by other i830_bios.c code.
 306  * Note that it would be better to use a BIOS call to get the VBT, as BIOSes may
 307  * feed an updated VBT back through that, compared to what we'll fetch using
 308  * this method of groping around in the BIOS data.
 309  *
 310  * Returns 0 on success, nonzero on failure.
 311  */
 312 bool
 313 intel_init_bios(struct drm_device *dev)
 314 {
 315         struct drm_i915_private *dev_priv = dev->dev_private;
 316         struct pci_dev *pdev = dev->pdev;
 317         struct vbt_header *vbt = NULL;
 318         struct bdb_header *bdb;
 319         u8 __iomem *bios;
 320         size_t size;
 321         int i;
 322
 323         bios = pci_map_rom(pdev, &size);
 324         if (!bios)
 325                 return -1;
 326
 327         /* Scour memory looking for the VBT signature */
 328         for (i = 0; i + 4 < size; i++) {
 329                 if (!memcmp(bios + i, "$VBT", 4)) {
 330                         vbt = (struct vbt_header *)(bios + i);
 331                         break;
 332                 }
 333         }
 334
 335         if (!vbt) {
 336                 DRM_ERROR("VBT signature missing\n");
 337                 pci_unmap_rom(pdev, bios);
 338                 return -1;
 339         }
 340
 341         bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
 342
 343         /* Grab useful general definitions */
 344         parse_general_features(dev_priv, bdb);
 345         parse_lfp_panel_data(dev_priv, bdb);
 346         parse_sdvo_panel_data(dev_priv, bdb);
 347         parse_sdvo_device_mapping(dev_priv, bdb);
 348         pci_unmap_rom(pdev, bios);
 349
 350         return 0;
 351 }