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 bdb_lvds_options *lvds_options;
 101         struct bdb_lvds_lfp_data *lvds_lfp_data;
 102         struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
 103         struct bdb_lvds_lfp_data_entry *entry;
 104         struct lvds_dvo_timing *dvo_timing;
 105         struct drm_display_mode *panel_fixed_mode;
 106         int lfp_data_size;
 107
 108         /* Defaults if we can't find VBT info */
 109         dev_priv->lvds_dither = 0;
 110         dev_priv->lvds_vbt = 0;
 111
 112         lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
 113         if (!lvds_options)
 114                 return;
 115
 116         dev_priv->lvds_dither = lvds_options->pixel_dither;
 117         if (lvds_options->panel_type == 0xff)
 118                 return;
 119
 120         lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
 121         if (!lvds_lfp_data)
 122                 return;
 123
 124         lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
 125         if (!lvds_lfp_data_ptrs)
 126                 return;
 127
 128         dev_priv->lvds_vbt = 1;
 129
 130         lfp_data_size = lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
 131                 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
 132         entry = (struct bdb_lvds_lfp_data_entry *)
 133                 ((uint8_t *)lvds_lfp_data->data + (lfp_data_size *
 134                                                    lvds_options->panel_type));
 135         dvo_timing = &entry->dvo_timing;
 136
 137         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 138
 139         fill_detail_timing_data(panel_fixed_mode, dvo_timing);
 140
 141         dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
 142
 143         DRM_DEBUG("Found panel mode in BIOS VBT tables:\n");
 144         drm_mode_debug_printmodeline(panel_fixed_mode);
 145
 146         return;
 147 }
 148
 149 /* Try to find sdvo panel data */
 150 static void
 151 parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
 152                       struct bdb_header *bdb)
 153 {
 154         struct bdb_sdvo_lvds_options *sdvo_lvds_options;
 155         struct lvds_dvo_timing *dvo_timing;
 156         struct drm_display_mode *panel_fixed_mode;
 157
 158         dev_priv->sdvo_lvds_vbt_mode = NULL;
 159
 160         sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
 161         if (!sdvo_lvds_options)
 162                 return;
 163
 164         dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
 165         if (!dvo_timing)
 166                 return;
 167
 168         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 169
 170         if (!panel_fixed_mode)
 171                 return;
 172
 173         fill_detail_timing_data(panel_fixed_mode,
 174                         dvo_timing + sdvo_lvds_options->panel_type);
 175
 176         dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
 177
 178         return;
 179 }
 180
 181 static void
 182 parse_general_features(struct drm_i915_private *dev_priv,
 183                        struct bdb_header *bdb)
 184 {
 185         struct bdb_general_features *general;
 186
 187         /* Set sensible defaults in case we can't find the general block */
 188         dev_priv->int_tv_support = 1;
 189         dev_priv->int_crt_support = 1;
 190
 191         general = find_section(bdb, BDB_GENERAL_FEATURES);
 192         if (general) {
 193                 dev_priv->int_tv_support = general->int_tv_support;
 194                 dev_priv->int_crt_support = general->int_crt_support;
 195                 dev_priv->lvds_use_ssc = general->enable_ssc;
 196
 197                 if (dev_priv->lvds_use_ssc) {
 198                   if (IS_I855(dev_priv->dev))
 199                     dev_priv->lvds_ssc_freq = general->ssc_freq ? 66 : 48;
 200                   else
 201                     dev_priv->lvds_ssc_freq = general->ssc_freq ? 100 : 96;
 202                 }
 203         }
 204 }
 205
 206 static void
 207 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
 208                        struct bdb_header *bdb)
 209 {
 210         struct sdvo_device_mapping *p_mapping;
 211         struct bdb_general_definitions *p_defs;
 212         struct child_device_config *p_child;
 213         int i, child_device_num, count;
 214         u16     block_size, *block_ptr;
 215
 216         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 217         if (!p_defs) {
 218                 DRM_DEBUG("No general definition block is found\n");
 219                 return;
 220         }
 221         /* judge whether the size of child device meets the requirements.
 222          * If the child device size obtained from general definition block
 223          * is different with sizeof(struct child_device_config), skip the
 224          * parsing of sdvo device info
 225          */
 226         if (p_defs->child_dev_size != sizeof(*p_child)) {
 227                 /* different child dev size . Ignore it */
 228                 DRM_DEBUG("different child size is found. Invalid.\n");
 229                 return;
 230         }
 231         /* get the block size of general definitions */
 232         block_ptr = (u16 *)((char *)p_defs - 2);
 233         block_size = *block_ptr;
 234         /* get the number of child device */
 235         child_device_num = (block_size - sizeof(*p_defs)) /
 236                                 sizeof(*p_child);
 237         count = 0;
 238         for (i = 0; i < child_device_num; i++) {
 239                 p_child = &(p_defs->devices[i]);
 240                 if (!p_child->device_type) {
 241                         /* skip the device block if device type is invalid */
 242                         continue;
 243                 }
 244                 if (p_child->slave_addr != SLAVE_ADDR1 &&
 245                         p_child->slave_addr != SLAVE_ADDR2) {
 246                         /*
 247                          * If the slave address is neither 0x70 nor 0x72,
 248                          * it is not a SDVO device. Skip it.
 249                          */
 250                         continue;
 251                 }
 252                 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
 253                         p_child->dvo_port != DEVICE_PORT_DVOC) {
 254                         /* skip the incorrect SDVO port */
 255                         DRM_DEBUG("Incorrect SDVO port. Skip it \n");
 256                         continue;
 257                 }
 258                 DRM_DEBUG("the SDVO device with slave addr %2x is found on "
 259                                 "%s port\n",
 260                                 p_child->slave_addr,
 261                                 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
 262                                         "SDVOB" : "SDVOC");
 263                 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
 264                 if (!p_mapping->initialized) {
 265                         p_mapping->dvo_port = p_child->dvo_port;
 266                         p_mapping->slave_addr = p_child->slave_addr;
 267                         p_mapping->dvo_wiring = p_child->dvo_wiring;
 268                         p_mapping->initialized = 1;
 269                 } else {
 270                         DRM_DEBUG("Maybe one SDVO port is shared by "
 271                                          "two SDVO device.\n");
 272                 }
 273                 if (p_child->slave2_addr) {
 274                         /* Maybe this is a SDVO device with multiple inputs */
 275                         /* And the mapping info is not added */
 276                         DRM_DEBUG("there exists the slave2_addr. Maybe this "
 277                                 "is a SDVO device with multiple inputs.\n");
 278                 }
 279                 count++;
 280         }
 281
 282         if (!count) {
 283                 /* No SDVO device info is found */
 284                 DRM_DEBUG("No SDVO device info is found in VBT\n");
 285         }
 286         return;
 287 }
 288 /**
 289  * intel_init_bios - initialize VBIOS settings & find VBT
 290  * @dev: DRM device
 291  *
 292  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
 293  * to appropriate values.
 294  *
 295  * VBT existence is a sanity check that is relied on by other i830_bios.c code.
 296  * Note that it would be better to use a BIOS call to get the VBT, as BIOSes may
 297  * feed an updated VBT back through that, compared to what we'll fetch using
 298  * this method of groping around in the BIOS data.
 299  *
 300  * Returns 0 on success, nonzero on failure.
 301  */
 302 bool
 303 intel_init_bios(struct drm_device *dev)
 304 {
 305         struct drm_i915_private *dev_priv = dev->dev_private;
 306         struct pci_dev *pdev = dev->pdev;
 307         struct vbt_header *vbt = NULL;
 308         struct bdb_header *bdb;
 309         u8 __iomem *bios;
 310         size_t size;
 311         int i;
 312
 313         bios = pci_map_rom(pdev, &size);
 314         if (!bios)
 315                 return -1;
 316
 317         /* Scour memory looking for the VBT signature */
 318         for (i = 0; i + 4 < size; i++) {
 319                 if (!memcmp(bios + i, "$VBT", 4)) {
 320                         vbt = (struct vbt_header *)(bios + i);
 321                         break;
 322                 }
 323         }
 324
 325         if (!vbt) {
 326                 DRM_ERROR("VBT signature missing\n");
 327                 pci_unmap_rom(pdev, bios);
 328                 return -1;
 329         }
 330
 331         bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
 332
 333         /* Grab useful general definitions */
 334         parse_general_features(dev_priv, bdb);
 335         parse_lfp_panel_data(dev_priv, bdb);
 336         parse_sdvo_panel_data(dev_priv, bdb);
 337         parse_sdvo_device_mapping(dev_priv, bdb);
 338         pci_unmap_rom(pdev, bios);
 339
 340         return 0;
 341 }