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