drivers/gpu/drm/nouveau/nouveau_mxm.c

   1 /*
   2  * Copyright 2011 Red Hat Inc.
   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 shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * Authors: Ben Skeggs
  23  */
  24
  25 #include <linux/acpi.h>
  26
  27 #include "drmP.h"
  28 #include "nouveau_drv.h"
  29
  30 #define MXM_DBG(dev, fmt, args...) NV_DEBUG((dev), "MXM: " fmt, ##args)
  31 #define MXM_MSG(dev, fmt, args...) NV_INFO((dev), "MXM: " fmt, ##args)
  32
  33 static u8 *
  34 mxms_data(struct drm_device *dev)
  35 {
  36         struct drm_nouveau_private *dev_priv = dev->dev_private;
  37         return dev_priv->mxms;
  38
  39 }
  40
  41 static u16
  42 mxms_version(struct drm_device *dev)
  43 {
  44         u8 *mxms = mxms_data(dev);
  45         u16 version = (mxms[4] << 8) | mxms[5];
  46         switch (version ) {
  47         case 0x0200:
  48         case 0x0201:
  49         case 0x0300:
  50                 return version;
  51         default:
  52                 break;
  53         }
  54
  55         MXM_DBG(dev, "unknown version %d.%d\n", mxms[4], mxms[5]);
  56         return 0x0000;
  57 }
  58
  59 static u16
  60 mxms_headerlen(struct drm_device *dev)
  61 {
  62         return 8;
  63 }
  64
  65 static u16
  66 mxms_structlen(struct drm_device *dev)
  67 {
  68         return *(u16 *)&mxms_data(dev)[6];
  69 }
  70
  71 static bool
  72 mxms_checksum(struct drm_device *dev)
  73 {
  74         u16 size = mxms_headerlen(dev) + mxms_structlen(dev);
  75         u8 *mxms = mxms_data(dev), sum = 0;
  76         while (size--)
  77                 sum += *mxms++;
  78         if (sum) {
  79                 MXM_DBG(dev, "checksum invalid\n");
  80                 return false;
  81         }
  82         return true;
  83 }
  84
  85 static bool
  86 mxms_valid(struct drm_device *dev)
  87 {
  88         u8 *mxms = mxms_data(dev);
  89         if (*(u32 *)mxms != 0x5f4d584d) {
  90                 MXM_DBG(dev, "signature invalid\n");
  91                 return false;
  92         }
  93
  94         if (!mxms_version(dev) || !mxms_checksum(dev))
  95                 return false;
  96
  97         return true;
  98 }
  99
 100 static bool
 101 mxms_foreach(struct drm_device *dev, u8 types,
 102              bool (*exec)(struct drm_device *, u8 *, void *), void *info)
 103 {
 104         u8 *mxms = mxms_data(dev);
 105         u8 *desc = mxms + mxms_headerlen(dev);
 106         u8 *fini = desc + mxms_structlen(dev) - 1;
 107         while (desc < fini) {
 108                 u8 type = desc[0] & 0x0f;
 109                 u8 headerlen = 0;
 110                 u8 recordlen = 0;
 111                 u8 entries = 0;
 112
 113                 switch (type) {
 114                 case 0: /* Output Device Structure */
 115                         if (mxms_version(dev) >= 0x0300)
 116                                 headerlen = 8;
 117                         else
 118                                 headerlen = 6;
 119                         break;
 120                 case 1: /* System Cooling Capability Structure */
 121                 case 2: /* Thermal Structure */
 122                 case 3: /* Input Power Structure */
 123                         headerlen = 4;
 124                         break;
 125                 case 4: /* GPIO Device Structure */
 126                         headerlen = 4;
 127                         recordlen = 2;
 128                         entries   = (ROM32(desc[0]) & 0x01f00000) >> 20;
 129                         break;
 130                 case 5: /* Vendor Specific Structure */
 131                         headerlen = 8;
 132                         break;
 133                 case 6: /* Backlight Control Structure */
 134                         if (mxms_version(dev) >= 0x0300) {
 135                                 headerlen = 4;
 136                                 recordlen = 8;
 137                                 entries   = (desc[1] & 0xf0) >> 4;
 138                         } else {
 139                                 headerlen = 8;
 140                         }
 141                         break;
 142                 case 7: /* Fan Control Structure */
 143                         headerlen = 8;
 144                         recordlen = 4;
 145                         entries   = desc[1] & 0x07;
 146                         break;
 147                 default:
 148                         MXM_DBG(dev, "unknown descriptor type %d\n", type);
 149                         return false;
 150                 }
 151
 152                 if ((drm_debug & DRM_UT_DRIVER) && (exec == NULL)) {
 153                         static const char * mxms_desc_name[] = {
 154                                 "ODS", "SCCS", "TS", "IPS",
 155                                 "GSD", "VSS", "BCS", "FCS",
 156                         };
 157                         u8 *dump = desc;
 158                         int i, j;
 159
 160                         MXM_DBG(dev, "%4s: ", mxms_desc_name[type]);
 161                         for (j = headerlen - 1; j >= 0; j--)
 162                                 printk("%02x", dump[j]);
 163                         printk("\n");
 164                         dump += headerlen;
 165
 166                         for (i = 0; i < entries; i++, dump += recordlen) {
 167                                 MXM_DBG(dev, "      ");
 168                                 for (j = recordlen - 1; j >= 0; j--)
 169                                         printk("%02x", dump[j]);
 170                                 printk("\n");
 171                         }
 172                 }
 173
 174                 if (types & (1 << type)) {
 175                         if (!exec(dev, desc, info))
 176                                 return false;
 177                 }
 178
 179                 desc += headerlen + (entries * recordlen);
 180         }
 181
 182         return true;
 183 }
 184
 185 static u8 *
 186 mxm_table(struct drm_device *dev, u8 *size)
 187 {
 188         struct bit_entry x;
 189
 190         if (bit_table(dev, 'x', &x)) {
 191                 MXM_DBG(dev, "BIT 'x' table not present\n");
 192                 return NULL;
 193         }
 194
 195         if (x.version != 1 || x.length < 3) {
 196                 MXM_MSG(dev, "BIT x table %d/%d unknown\n",
 197                         x.version, x.length);
 198                 return NULL;
 199         }
 200
 201         *size = x.length;
 202         return x.data;
 203 }
 204
 205 /* These map MXM v2.x digital connection values to the appropriate SOR/link,
 206  * hopefully they're correct for all boards within the same chipset...
 207  *
 208  * MXM v3.x VBIOS are nicer and provide pointers to these tables.
 209  */
 210 static u8 nv84_sor_map[16] = {
 211         0x00, 0x12, 0x22, 0x11, 0x32, 0x31, 0x11, 0x31,
 212         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
 213 };
 214
 215 static u8 nv92_sor_map[16] = {
 216         0x00, 0x12, 0x22, 0x11, 0x32, 0x31, 0x11, 0x31,
 217         0x11, 0x31, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
 218 };
 219
 220 static u8 nv94_sor_map[16] = {
 221         0x00, 0x14, 0x24, 0x11, 0x34, 0x31, 0x11, 0x31,
 222         0x11, 0x31, 0x12, 0x00, 0x00, 0x00, 0x00, 0x00
 223 };
 224
 225 static u8 nv96_sor_map[16] = {
 226         0x00, 0x14, 0x24, 0x00, 0x34, 0x00, 0x11, 0x31,
 227         0x11, 0x31, 0x12, 0x00, 0x00, 0x00, 0x00, 0x00
 228 };
 229
 230 static u8 nv98_sor_map[16] = {
 231         0x00, 0x14, 0x12, 0x11, 0x00, 0x31, 0x11, 0x31,
 232         0x11, 0x31, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
 233 };
 234
 235 static u8
 236 mxm_sor_map(struct drm_device *dev, u8 conn)
 237 {
 238         struct drm_nouveau_private *dev_priv = dev->dev_private;
 239         u8 len, *mxm = mxm_table(dev, &len);
 240         if (mxm && len >= 6) {
 241                 u8 *map = ROMPTR(dev, mxm[4]);
 242                 if (map) {
 243                         if (map[0] == 0x10) {
 244                                 if (conn < map[3])
 245                                         return map[map[1] + conn];
 246                                 return 0x00;
 247                         }
 248
 249                         MXM_MSG(dev, "unknown sor map 0x%02x\n", map[0]);
 250                 }
 251         }
 252
 253         if (dev_priv->chipset == 0x84 || dev_priv->chipset == 0x86)
 254                 return nv84_sor_map[conn];
 255         if (dev_priv->chipset == 0x92)
 256                 return nv92_sor_map[conn];
 257         if (dev_priv->chipset == 0x94)
 258                 return nv94_sor_map[conn];
 259         if (dev_priv->chipset == 0x96)
 260                 return nv96_sor_map[conn];
 261         if (dev_priv->chipset == 0x98)
 262                 return nv98_sor_map[conn];
 263
 264         MXM_MSG(dev, "missing sor map\n");
 265         return 0x00;
 266 }
 267
 268 static u8
 269 mxm_ddc_map(struct drm_device *dev, u8 port)
 270 {
 271         u8 len, *mxm = mxm_table(dev, &len);
 272         if (mxm && len >= 8) {
 273                 u8 *map = ROMPTR(dev, mxm[6]);
 274                 if (map) {
 275                         if (map[0] == 0x10) {
 276                                 if (port < map[3])
 277                                         return map[map[1] + port];
 278                                 return 0x00;
 279                         }
 280
 281                         MXM_MSG(dev, "unknown ddc map 0x%02x\n", map[0]);
 282                 }
 283         }
 284
 285         /* v2.x: directly write port as dcb i2cidx */
 286         return (port << 4) | port;
 287 }
 288
 289 struct mxms_odev {
 290         u8 outp_type;
 291         u8 conn_type;
 292         u8 ddc_port;
 293         u8 dig_conn;
 294 };
 295
 296 static void
 297 mxms_output_device(struct drm_device *dev, u8 *pdata, struct mxms_odev *desc)
 298 {
 299         u64 data = ROM32(pdata[0]);
 300         if (mxms_version(dev) >= 0x0300)
 301                 data |= (u64)ROM16(pdata[4]) << 32;
 302
 303         desc->outp_type = (data & 0x00000000000000f0ULL) >> 4;
 304         desc->ddc_port  = (data & 0x0000000000000f00ULL) >> 8;
 305         desc->conn_type = (data & 0x000000000001f000ULL) >> 12;
 306         desc->dig_conn  = (data & 0x0000000000780000ULL) >> 19;
 307 }
 308
 309 struct context {
 310         u32 *outp;
 311         struct mxms_odev desc;
 312 };
 313
 314 static bool
 315 mxm_match_tmds_partner(struct drm_device *dev, u8 *data, void *info)
 316 {
 317         struct context *ctx = info;
 318         struct mxms_odev desc;
 319
 320         mxms_output_device(dev, data, &desc);
 321         if (desc.outp_type == 2 &&
 322             desc.dig_conn == ctx->desc.dig_conn)
 323                 return false;
 324         return true;
 325 }
 326
 327 static bool
 328 mxm_match_dcb(struct drm_device *dev, u8 *data, void *info)
 329 {
 330         struct context *ctx = info;
 331         u64 desc = *(u64 *)data;
 332
 333         mxms_output_device(dev, data, &ctx->desc);
 334
 335         /* match dcb encoder type to mxm-ods device type */
 336         if ((ctx->outp[0] & 0x0000000f) != ctx->desc.outp_type)
 337                 return true;
 338
 339         /* digital output, have some extra stuff to match here, there's a
 340          * table in the vbios that provides a mapping from the mxm digital
 341          * connection enum values to SOR/link
 342          */
 343         if ((desc & 0x00000000000000f0) >= 0x20) {
 344                 /* check against sor index */
 345                 u8 link = mxm_sor_map(dev, ctx->desc.dig_conn);
 346                 if ((ctx->outp[0] & 0x0f000000) != (link & 0x0f) << 24)
 347                         return true;
 348
 349                 /* check dcb entry has a compatible link field */
 350                 link = (link & 0x30) >> 4;
 351                 if ((link & ((ctx->outp[1] & 0x00000030) >> 4)) != link)
 352                         return true;
 353         }
 354
 355         /* mark this descriptor accounted for by setting invalid device type,
 356          * except of course some manufactures don't follow specs properly and
 357          * we need to avoid killing off the TMDS function on DP connectors
 358          * if MXM-SIS is missing an entry for it.
 359          */
 360         data[0] &= ~0xf0;
 361         if (ctx->desc.outp_type == 6 && ctx->desc.conn_type == 6 &&
 362             mxms_foreach(dev, 0x01, mxm_match_tmds_partner, ctx)) {
 363                 data[0] |= 0x20; /* modify descriptor to match TMDS now */
 364         } else {
 365                 data[0] |= 0xf0;
 366         }
 367
 368         return false;
 369 }
 370
 371 static int
 372 mxm_dcb_sanitise_entry(struct drm_device *dev, void *data, int idx, u8 *dcbe)
 373 {
 374         struct context ctx = { .outp = (u32 *)dcbe };
 375         u8 type, i2cidx, link;
 376         u8 *conn;
 377
 378         /* look for an output device structure that matches this dcb entry.
 379          * if one isn't found, disable it.
 380          */
 381         if (mxms_foreach(dev, 0x01, mxm_match_dcb, &ctx)) {
 382                 MXM_DBG(dev, "disable %d: 0x%08x 0x%08x\n",
 383                         idx, ctx.outp[0], ctx.outp[1]);
 384                 ctx.outp[0] |= 0x0000000f;
 385                 return 0;
 386         }
 387
 388         /* modify the output's ddc/aux port, there's a pointer to a table
 389          * with the mapping from mxm ddc/aux port to dcb i2c_index in the
 390          * vbios mxm table
 391          */
 392         i2cidx = mxm_ddc_map(dev, ctx.desc.ddc_port);
 393         if ((ctx.outp[0] & 0x0000000f) != OUTPUT_DP)
 394                 i2cidx = (i2cidx & 0x0f) << 4;
 395         else
 396                 i2cidx = (i2cidx & 0xf0);
 397
 398         if (i2cidx != 0xf0) {
 399                 ctx.outp[0] &= ~0x000000f0;
 400                 ctx.outp[0] |= i2cidx;
 401         }
 402
 403         /* override dcb sorconf.link, based on what mxm data says */
 404         switch (ctx.desc.outp_type) {
 405         case 0x00: /* Analog CRT */
 406         case 0x01: /* Analog TV/HDTV */
 407                 break;
 408         default:
 409                 link = mxm_sor_map(dev, ctx.desc.dig_conn) & 0x30;
 410                 ctx.outp[1] &= ~0x00000030;
 411                 ctx.outp[1] |= link;
 412                 break;
 413         }
 414
 415         /* we may need to fixup various other vbios tables based on what
 416          * the descriptor says the connector type should be.
 417          *
 418          * in a lot of cases, the vbios tables will claim DVI-I is possible,
 419          * and the mxm data says the connector is really HDMI.  another
 420          * common example is DP->eDP.
 421          */
 422         conn = dcb_conn(dev, (ctx.outp[0] & 0x0000f000) >> 12);
 423         type = conn[0];
 424         switch (ctx.desc.conn_type) {
 425         case 0x01: /* LVDS */
 426                 ctx.outp[1] |= 0x00000004; /* use_power_scripts */
 427                 /* XXX: modify default link width in LVDS table */
 428                 break;
 429         case 0x02: /* HDMI */
 430                 type = DCB_CONNECTOR_HDMI_1;
 431                 break;
 432         case 0x03: /* DVI-D */
 433                 type = DCB_CONNECTOR_DVI_D;
 434                 break;
 435         case 0x0e: /* eDP, falls through to DPint */
 436                 ctx.outp[1] |= 0x00010000;
 437         case 0x07: /* DP internal, wtf is this?? HP8670w */
 438                 ctx.outp[1] |= 0x00000004; /* use_power_scripts? */
 439                 type = DCB_CONNECTOR_eDP;
 440                 break;
 441         default:
 442                 break;
 443         }
 444
 445         if (mxms_version(dev) >= 0x0300)
 446                 conn[0] = type;
 447
 448         return 0;
 449 }
 450
 451 static bool
 452 mxm_show_unmatched(struct drm_device *dev, u8 *data, void *info)
 453 {
 454         u64 desc = *(u64 *)data;
 455         if ((desc & 0xf0) != 0xf0)
 456                 MXM_MSG(dev, "unmatched output device 0x%016llx\n", desc);
 457         return true;
 458 }
 459
 460 static void
 461 mxm_dcb_sanitise(struct drm_device *dev)
 462 {
 463         u8 *dcb = dcb_table(dev);
 464         if (!dcb || dcb[0] != 0x40) {
 465                 MXM_DBG(dev, "unsupported DCB version\n");
 466                 return;
 467         }
 468
 469         dcb_outp_foreach(dev, NULL, mxm_dcb_sanitise_entry);
 470         mxms_foreach(dev, 0x01, mxm_show_unmatched, NULL);
 471 }
 472
 473 static bool
 474 mxm_shadow_rom_fetch(struct nouveau_i2c_chan *i2c, u8 addr,
 475                      u8 offset, u8 size, u8 *data)
 476 {
 477         struct i2c_msg msgs[] = {
 478                 { .addr = addr, .flags = 0, .len = 1, .buf = &offset },
 479                 { .addr = addr, .flags = I2C_M_RD, .len = size, .buf = data, },
 480         };
 481
 482         return i2c_transfer(&i2c->adapter, msgs, 2) == 2;
 483 }
 484
 485 static bool
 486 mxm_shadow_rom(struct drm_device *dev, u8 version)
 487 {
 488         struct drm_nouveau_private *dev_priv = dev->dev_private;
 489         struct nouveau_i2c_chan *i2c = NULL;
 490         u8 i2cidx, mxms[6], addr, size;
 491
 492         i2cidx = mxm_ddc_map(dev, 1 /* LVDS_DDC */) & 0x0f;
 493         if (i2cidx < 0x0f)
 494                 i2c = nouveau_i2c_find(dev, i2cidx);
 495         if (!i2c)
 496                 return false;
 497
 498         addr = 0x54;
 499         if (!mxm_shadow_rom_fetch(i2c, addr, 0, 6, mxms)) {
 500                 addr = 0x56;
 501                 if (!mxm_shadow_rom_fetch(i2c, addr, 0, 6, mxms))
 502                         return false;
 503         }
 504
 505         dev_priv->mxms = mxms;
 506         size = mxms_headerlen(dev) + mxms_structlen(dev);
 507         dev_priv->mxms = kmalloc(size, GFP_KERNEL);
 508
 509         if (dev_priv->mxms &&
 510             mxm_shadow_rom_fetch(i2c, addr, 0, size, dev_priv->mxms))
 511                 return true;
 512
 513         kfree(dev_priv->mxms);
 514         dev_priv->mxms = NULL;
 515         return false;
 516 }
 517
 518 #if defined(CONFIG_ACPI)
 519 static bool
 520 mxm_shadow_dsm(struct drm_device *dev, u8 version)
 521 {
 522         struct drm_nouveau_private *dev_priv = dev->dev_private;
 523         static char muid[] = {
 524                 0x00, 0xA4, 0x04, 0x40, 0x7D, 0x91, 0xF2, 0x4C,
 525                 0xB8, 0x9C, 0x79, 0xB6, 0x2F, 0xD5, 0x56, 0x65
 526         };
 527         u32 mxms_args[] = { 0x00000000 };
 528         union acpi_object args[4] = {
 529                 /* _DSM MUID */
 530                 { .buffer.type = 3,
 531                   .buffer.length = sizeof(muid),
 532                   .buffer.pointer = muid,
 533                 },
 534                 /* spec says this can be zero to mean "highest revision", but
 535                  * of course there's at least one bios out there which fails
 536                  * unless you pass in exactly the version it supports..
 537                  */
 538                 { .integer.type = ACPI_TYPE_INTEGER,
 539                   .integer.value = (version & 0xf0) << 4 | (version & 0x0f),
 540                 },
 541                 /* MXMS function */
 542                 { .integer.type = ACPI_TYPE_INTEGER,
 543                   .integer.value = 0x00000010,
 544                 },
 545                 /* Pointer to MXMS arguments */
 546                 { .buffer.type = ACPI_TYPE_BUFFER,
 547                   .buffer.length = sizeof(mxms_args),
 548                   .buffer.pointer = (char *)mxms_args,
 549                 },
 550         };
 551         struct acpi_object_list list = { ARRAY_SIZE(args), args };
 552         struct acpi_buffer retn = { ACPI_ALLOCATE_BUFFER, NULL };
 553         union acpi_object *obj;
 554         acpi_handle handle;
 555         int ret;
 556
 557         handle = DEVICE_ACPI_HANDLE(&dev->pdev->dev);
 558         if (!handle)
 559                 return false;
 560
 561         ret = acpi_evaluate_object(handle, "_DSM", &list, &retn);
 562         if (ret) {
 563                 MXM_DBG(dev, "DSM MXMS failed: %d\n", ret);
 564                 return false;
 565         }
 566
 567         obj = retn.pointer;
 568         if (obj->type == ACPI_TYPE_BUFFER) {
 569                 dev_priv->mxms = kmemdup(obj->buffer.pointer,
 570                                          obj->buffer.length, GFP_KERNEL);
 571         } else
 572         if (obj->type == ACPI_TYPE_INTEGER) {
 573                 MXM_DBG(dev, "DSM MXMS returned 0x%llx\n", obj->integer.value);
 574         }
 575
 576         kfree(obj);
 577         return dev_priv->mxms != NULL;
 578 }
 579 #endif
 580
 581 #if defined(CONFIG_ACPI_WMI) || defined(CONFIG_ACPI_WMI_MODULE)
 582
 583 #define WMI_WMMX_GUID "F6CB5C3C-9CAE-4EBD-B577-931EA32A2CC0"
 584
 585 static bool
 586 mxm_shadow_wmi(struct drm_device *dev, u8 version)
 587 {
 588         struct drm_nouveau_private *dev_priv = dev->dev_private;
 589         u32 mxms_args[] = { 0x534D584D /* MXMS */, version, 0 };
 590         struct acpi_buffer args = { sizeof(mxms_args), mxms_args };
 591         struct acpi_buffer retn = { ACPI_ALLOCATE_BUFFER, NULL };
 592         union acpi_object *obj;
 593         acpi_status status;
 594
 595         if (!wmi_has_guid(WMI_WMMX_GUID))
 596                 return false;
 597
 598         status = wmi_evaluate_method(WMI_WMMX_GUID, 0, 0, &args, &retn);
 599         if (ACPI_FAILURE(status)) {
 600                 MXM_DBG(dev, "WMMX MXMS returned %d\n", status);
 601                 return false;
 602         }
 603
 604         obj = retn.pointer;
 605         if (obj->type == ACPI_TYPE_BUFFER) {
 606                 dev_priv->mxms = kmemdup(obj->buffer.pointer,
 607                                          obj->buffer.length, GFP_KERNEL);
 608         }
 609
 610         kfree(obj);
 611         return dev_priv->mxms != NULL;
 612 }
 613 #endif
 614
 615 struct mxm_shadow_h {
 616         const char *name;
 617         bool (*exec)(struct drm_device *, u8 version);
 618 } _mxm_shadow[] = {
 619         { "ROM", mxm_shadow_rom },
 620 #if defined(CONFIG_ACPI)
 621         { "DSM", mxm_shadow_dsm },
 622 #endif
 623 #if defined(CONFIG_ACPI_WMI) || defined(CONFIG_ACPI_WMI_MODULE)
 624         { "WMI", mxm_shadow_wmi },
 625 #endif
 626         {}
 627 };
 628
 629 static int
 630 mxm_shadow(struct drm_device *dev, u8 version)
 631 {
 632         struct drm_nouveau_private *dev_priv = dev->dev_private;
 633         struct mxm_shadow_h *shadow = _mxm_shadow;
 634         do {
 635                 MXM_DBG(dev, "checking %s\n", shadow->name);
 636                 if (shadow->exec(dev, version)) {
 637                         if (mxms_valid(dev))
 638                                 return 0;
 639                         kfree(dev_priv->mxms);
 640                         dev_priv->mxms = NULL;
 641                 }
 642         } while ((++shadow)->name);
 643         return -ENOENT;
 644 }
 645
 646 int
 647 nouveau_mxm_init(struct drm_device *dev)
 648 {
 649         u8 mxm_size, *mxm = mxm_table(dev, &mxm_size);
 650         if (!mxm || !mxm[0]) {
 651                 MXM_MSG(dev, "no VBIOS data, nothing to do\n");
 652                 return 0;
 653         }
 654
 655         MXM_MSG(dev, "BIOS version %d.%d\n", mxm[0] >> 4, mxm[0] & 0x0f);
 656
 657         if (mxm_shadow(dev, mxm[0])) {
 658                 MXM_MSG(dev, "failed to locate valid SIS\n");
 659 #if 0
 660                 /* we should, perhaps, fall back to some kind of limited
 661                  * mode here if the x86 vbios hasn't already done the
 662                  * work for us (so we prevent loading with completely
 663                  * whacked vbios tables).
 664                  */
 665                 return -EINVAL;
 666 #else
 667                 return 0;
 668 #endif
 669         }
 670
 671         MXM_MSG(dev, "MXMS Version %d.%d\n",
 672                 mxms_version(dev) >> 8, mxms_version(dev) & 0xff);
 673         mxms_foreach(dev, 0, NULL, NULL);
 674
 675         if (nouveau_mxmdcb)
 676                 mxm_dcb_sanitise(dev);
 677         return 0;
 678 }
 679
 680 void
 681 nouveau_mxm_fini(struct drm_device *dev)
 682 {
 683         struct drm_nouveau_private *dev_priv = dev->dev_private;
 684         kfree(dev_priv->mxms);
 685         dev_priv->mxms = NULL;
 686 }