drivers/acpi/hardware/hwsleep.c

   1
   2 /******************************************************************************
   3  *
   4  * Name: hwsleep.c - ACPI Hardware Sleep/Wake Interface
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2004, R. Byron Moore
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include <linux/module.h>
  46
  47 #include <acpi/acpi.h>
  48
  49 #define _COMPONENT          ACPI_HARDWARE
  50          ACPI_MODULE_NAME    ("hwsleep")
  51
  52
  53 #define METHOD_NAME__BFS        "\\_BFS"
  54 #define METHOD_NAME__GTS        "\\_GTS"
  55 #define METHOD_NAME__PTS        "\\_PTS"
  56 #define METHOD_NAME__SST        "\\_SI._SST"
  57 #define METHOD_NAME__WAK        "\\_WAK"
  58
  59 #define ACPI_SST_INDICATOR_OFF  0
  60 #define ACPI_SST_WORKING        1
  61 #define ACPI_SST_WAKING         2
  62 #define ACPI_SST_SLEEPING       3
  63 #define ACPI_SST_SLEEP_CONTEXT  4
  64
  65
  66 /******************************************************************************
  67  *
  68  * FUNCTION:    acpi_set_firmware_waking_vector
  69  *
  70  * PARAMETERS:  physical_address    - Physical address of ACPI real mode
  71  *                                    entry point.
  72  *
  73  * RETURN:      Status
  74  *
  75  * DESCRIPTION: access function for d_firmware_waking_vector field in FACS
  76  *
  77  ******************************************************************************/
  78
  79 acpi_status
  80 acpi_set_firmware_waking_vector (
  81         acpi_physical_address physical_address)
  82 {
  83
  84         ACPI_FUNCTION_TRACE ("acpi_set_firmware_waking_vector");
  85
  86
  87         /* Set the vector */
  88
  89         if (acpi_gbl_common_fACS.vector_width == 32) {
  90                 *(ACPI_CAST_PTR (u32, acpi_gbl_common_fACS.firmware_waking_vector))
  91                                 = (u32) physical_address;
  92         }
  93         else {
  94                 *acpi_gbl_common_fACS.firmware_waking_vector
  95                                 = physical_address;
  96         }
  97
  98         return_ACPI_STATUS (AE_OK);
  99 }
 100
 101
 102 /******************************************************************************
 103  *
 104  * FUNCTION:    acpi_get_firmware_waking_vector
 105  *
 106  * PARAMETERS:  *physical_address   - Output buffer where contents of
 107  *                                    the firmware_waking_vector field of
 108  *                                    the FACS will be stored.
 109  *
 110  * RETURN:      Status
 111  *
 112  * DESCRIPTION: Access function for firmware_waking_vector field in FACS
 113  *
 114  ******************************************************************************/
 115 #ifdef ACPI_FUTURE_USAGE
 116 acpi_status
 117 acpi_get_firmware_waking_vector (
 118         acpi_physical_address *physical_address)
 119 {
 120
 121         ACPI_FUNCTION_TRACE ("acpi_get_firmware_waking_vector");
 122
 123
 124         if (!physical_address) {
 125                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 126         }
 127
 128         /* Get the vector */
 129
 130         if (acpi_gbl_common_fACS.vector_width == 32) {
 131                 *physical_address = (acpi_physical_address)
 132                         *(ACPI_CAST_PTR (u32, acpi_gbl_common_fACS.firmware_waking_vector));
 133         }
 134         else {
 135                 *physical_address =
 136                         *acpi_gbl_common_fACS.firmware_waking_vector;
 137         }
 138
 139         return_ACPI_STATUS (AE_OK);
 140 }
 141 #endif
 142
 143
 144 /******************************************************************************
 145  *
 146  * FUNCTION:    acpi_enter_sleep_state_prep
 147  *
 148  * PARAMETERS:  sleep_state         - Which sleep state to enter
 149  *
 150  * RETURN:      Status
 151  *
 152  * DESCRIPTION: Prepare to enter a system sleep state (see ACPI 2.0 spec p 231)
 153  *              This function must execute with interrupts enabled.
 154  *              We break sleeping into 2 stages so that OSPM can handle
 155  *              various OS-specific tasks between the two steps.
 156  *
 157  ******************************************************************************/
 158
 159 acpi_status
 160 acpi_enter_sleep_state_prep (
 161         u8                          sleep_state)
 162 {
 163         acpi_status                 status;
 164         struct acpi_object_list     arg_list;
 165         union acpi_object           arg;
 166
 167
 168         ACPI_FUNCTION_TRACE ("acpi_enter_sleep_state_prep");
 169
 170
 171         /*
 172          * _PSW methods could be run here to enable wake-on keyboard, LAN, etc.
 173          */
 174         status = acpi_get_sleep_type_data (sleep_state,
 175                           &acpi_gbl_sleep_type_a, &acpi_gbl_sleep_type_b);
 176         if (ACPI_FAILURE (status)) {
 177                 return_ACPI_STATUS (status);
 178         }
 179
 180         /* Setup parameter object */
 181
 182         arg_list.count = 1;
 183         arg_list.pointer = &arg;
 184
 185         arg.type = ACPI_TYPE_INTEGER;
 186         arg.integer.value = sleep_state;
 187
 188         /* Run the _PTS and _GTS methods */
 189
 190         status = acpi_evaluate_object (NULL, METHOD_NAME__PTS, &arg_list, NULL);
 191         if (ACPI_FAILURE (status) && status != AE_NOT_FOUND) {
 192                 return_ACPI_STATUS (status);
 193         }
 194
 195         status = acpi_evaluate_object (NULL, METHOD_NAME__GTS, &arg_list, NULL);
 196         if (ACPI_FAILURE (status) && status != AE_NOT_FOUND) {
 197                 return_ACPI_STATUS (status);
 198         }
 199
 200         /* Setup the argument to _SST */
 201
 202         switch (sleep_state) {
 203         case ACPI_STATE_S0:
 204                 arg.integer.value = ACPI_SST_WORKING;
 205                 break;
 206
 207         case ACPI_STATE_S1:
 208         case ACPI_STATE_S2:
 209         case ACPI_STATE_S3:
 210                 arg.integer.value = ACPI_SST_SLEEPING;
 211                 break;
 212
 213         case ACPI_STATE_S4:
 214                 arg.integer.value = ACPI_SST_SLEEP_CONTEXT;
 215                 break;
 216
 217         default:
 218                 arg.integer.value = ACPI_SST_INDICATOR_OFF; /* Default is indicator off */
 219                 break;
 220         }
 221
 222         /* Set the system indicators to show the desired sleep state. */
 223
 224         status = acpi_evaluate_object (NULL, METHOD_NAME__SST, &arg_list, NULL);
 225         if (ACPI_FAILURE (status) && status != AE_NOT_FOUND) {
 226                  ACPI_REPORT_ERROR (("Method _SST failed, %s\n", acpi_format_exception (status)));
 227         }
 228
 229         return_ACPI_STATUS (AE_OK);
 230 }
 231
 232
 233 /******************************************************************************
 234  *
 235  * FUNCTION:    acpi_enter_sleep_state
 236  *
 237  * PARAMETERS:  sleep_state         - Which sleep state to enter
 238  *
 239  * RETURN:      Status
 240  *
 241  * DESCRIPTION: Enter a system sleep state (see ACPI 2.0 spec p 231)
 242  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 243  *
 244  ******************************************************************************/
 245
 246 acpi_status asmlinkage
 247 acpi_enter_sleep_state (
 248         u8                              sleep_state)
 249 {
 250         u32                             PM1Acontrol;
 251         u32                             PM1Bcontrol;
 252         struct acpi_bit_register_info   *sleep_type_reg_info;
 253         struct acpi_bit_register_info   *sleep_enable_reg_info;
 254         u32                             in_value;
 255         acpi_status                     status;
 256
 257
 258         ACPI_FUNCTION_TRACE ("acpi_enter_sleep_state");
 259
 260
 261         if ((acpi_gbl_sleep_type_a > ACPI_SLEEP_TYPE_MAX) ||
 262                 (acpi_gbl_sleep_type_b > ACPI_SLEEP_TYPE_MAX)) {
 263                 ACPI_REPORT_ERROR (("Sleep values out of range: A=%X B=%X\n",
 264                         acpi_gbl_sleep_type_a, acpi_gbl_sleep_type_b));
 265                 return_ACPI_STATUS (AE_AML_OPERAND_VALUE);
 266         }
 267
 268         sleep_type_reg_info = acpi_hw_get_bit_register_info (ACPI_BITREG_SLEEP_TYPE_A);
 269         sleep_enable_reg_info = acpi_hw_get_bit_register_info (ACPI_BITREG_SLEEP_ENABLE);
 270
 271         /* Clear wake status */
 272
 273         status = acpi_set_register (ACPI_BITREG_WAKE_STATUS, 1, ACPI_MTX_DO_NOT_LOCK);
 274         if (ACPI_FAILURE (status)) {
 275                 return_ACPI_STATUS (status);
 276         }
 277
 278         /* Clear all fixed and general purpose status bits */
 279
 280         status = acpi_hw_clear_acpi_status (ACPI_MTX_DO_NOT_LOCK);
 281         if (ACPI_FAILURE (status)) {
 282                 return_ACPI_STATUS (status);
 283         }
 284
 285         if (sleep_state != ACPI_STATE_S5) {
 286                 /* Disable BM arbitration */
 287
 288                 status = acpi_set_register (ACPI_BITREG_ARB_DISABLE, 1, ACPI_MTX_DO_NOT_LOCK);
 289                 if (ACPI_FAILURE (status)) {
 290                         return_ACPI_STATUS (status);
 291                 }
 292         }
 293
 294         /*
 295          * 1) Disable/Clear all GPEs
 296          * 2) Enable all wakeup GPEs
 297          */
 298         status = acpi_hw_disable_all_gpes (ACPI_ISR);
 299         if (ACPI_FAILURE (status)) {
 300                 return_ACPI_STATUS (status);
 301         }
 302         acpi_gbl_system_awake_and_running = FALSE;
 303
 304         status = acpi_hw_enable_all_wakeup_gpes (ACPI_ISR);
 305         if (ACPI_FAILURE (status)) {
 306                 return_ACPI_STATUS (status);
 307         }
 308
 309         /* Get current value of PM1A control */
 310
 311         status = acpi_hw_register_read (ACPI_MTX_DO_NOT_LOCK, ACPI_REGISTER_PM1_CONTROL, &PM1Acontrol);
 312         if (ACPI_FAILURE (status)) {
 313                 return_ACPI_STATUS (status);
 314         }
 315         ACPI_DEBUG_PRINT ((ACPI_DB_INIT, "Entering sleep state [S%d]\n", sleep_state));
 316
 317         /* Clear SLP_EN and SLP_TYP fields */
 318
 319         PM1Acontrol &= ~(sleep_type_reg_info->access_bit_mask | sleep_enable_reg_info->access_bit_mask);
 320         PM1Bcontrol = PM1Acontrol;
 321
 322         /* Insert SLP_TYP bits */
 323
 324         PM1Acontrol |= (acpi_gbl_sleep_type_a << sleep_type_reg_info->bit_position);
 325         PM1Bcontrol |= (acpi_gbl_sleep_type_b << sleep_type_reg_info->bit_position);
 326
 327         /*
 328          * We split the writes of SLP_TYP and SLP_EN to workaround
 329          * poorly implemented hardware.
 330          */
 331
 332         /* Write #1: fill in SLP_TYP data */
 333
 334         status = acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK, ACPI_REGISTER_PM1A_CONTROL, PM1Acontrol);
 335         if (ACPI_FAILURE (status)) {
 336                 return_ACPI_STATUS (status);
 337         }
 338
 339         status = acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK, ACPI_REGISTER_PM1B_CONTROL, PM1Bcontrol);
 340         if (ACPI_FAILURE (status)) {
 341                 return_ACPI_STATUS (status);
 342         }
 343
 344         /* Insert SLP_ENABLE bit */
 345
 346         PM1Acontrol |= sleep_enable_reg_info->access_bit_mask;
 347         PM1Bcontrol |= sleep_enable_reg_info->access_bit_mask;
 348
 349         /* Write #2: SLP_TYP + SLP_EN */
 350
 351         ACPI_FLUSH_CPU_CACHE ();
 352
 353         status = acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK, ACPI_REGISTER_PM1A_CONTROL, PM1Acontrol);
 354         if (ACPI_FAILURE (status)) {
 355                 return_ACPI_STATUS (status);
 356         }
 357
 358         status = acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK, ACPI_REGISTER_PM1B_CONTROL, PM1Bcontrol);
 359         if (ACPI_FAILURE (status)) {
 360                 return_ACPI_STATUS (status);
 361         }
 362
 363         if (sleep_state > ACPI_STATE_S3) {
 364                 /*
 365                  * We wanted to sleep > S3, but it didn't happen (by virtue of the fact that
 366                  * we are still executing!)
 367                  *
 368                  * Wait ten seconds, then try again. This is to get S4/S5 to work on all machines.
 369                  *
 370                  * We wait so long to allow chipsets that poll this reg very slowly to
 371                  * still read the right value. Ideally, this block would go
 372                  * away entirely.
 373                  */
 374                 acpi_os_stall (10000000);
 375
 376                 status = acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK, ACPI_REGISTER_PM1_CONTROL,
 377                                  sleep_enable_reg_info->access_bit_mask);
 378                 if (ACPI_FAILURE (status)) {
 379                         return_ACPI_STATUS (status);
 380                 }
 381         }
 382
 383         /* Wait until we enter sleep state */
 384
 385         do {
 386                 status = acpi_get_register (ACPI_BITREG_WAKE_STATUS, &in_value, ACPI_MTX_DO_NOT_LOCK);
 387                 if (ACPI_FAILURE (status)) {
 388                         return_ACPI_STATUS (status);
 389                 }
 390
 391                 /* Spin until we wake */
 392
 393         } while (!in_value);
 394
 395         return_ACPI_STATUS (AE_OK);
 396 }
 397 EXPORT_SYMBOL(acpi_enter_sleep_state);
 398
 399
 400 /******************************************************************************
 401  *
 402  * FUNCTION:    acpi_enter_sleep_state_s4bios
 403  *
 404  * PARAMETERS:  None
 405  *
 406  * RETURN:      Status
 407  *
 408  * DESCRIPTION: Perform a S4 bios request.
 409  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
 410  *
 411  ******************************************************************************/
 412
 413 acpi_status asmlinkage
 414 acpi_enter_sleep_state_s4bios (
 415         void)
 416 {
 417         u32                             in_value;
 418         acpi_status                     status;
 419
 420
 421         ACPI_FUNCTION_TRACE ("acpi_enter_sleep_state_s4bios");
 422
 423
 424         status = acpi_set_register (ACPI_BITREG_WAKE_STATUS, 1, ACPI_MTX_DO_NOT_LOCK);
 425         if (ACPI_FAILURE (status)) {
 426                 return_ACPI_STATUS (status);
 427         }
 428
 429         status = acpi_hw_clear_acpi_status (ACPI_MTX_DO_NOT_LOCK);
 430         if (ACPI_FAILURE (status)) {
 431                 return_ACPI_STATUS (status);
 432         }
 433
 434         /*
 435          * 1) Disable/Clear all GPEs
 436          * 2) Enable all wakeup GPEs
 437          */
 438         status = acpi_hw_disable_all_gpes (ACPI_ISR);
 439         if (ACPI_FAILURE (status)) {
 440                 return_ACPI_STATUS (status);
 441         }
 442         acpi_gbl_system_awake_and_running = FALSE;
 443
 444         status = acpi_hw_enable_all_wakeup_gpes (ACPI_ISR);
 445         if (ACPI_FAILURE (status)) {
 446                 return_ACPI_STATUS (status);
 447         }
 448
 449         ACPI_FLUSH_CPU_CACHE ();
 450
 451         status = acpi_os_write_port (acpi_gbl_FADT->smi_cmd, (u32) acpi_gbl_FADT->S4bios_req, 8);
 452
 453         do {
 454                 acpi_os_stall(1000);
 455                 status = acpi_get_register (ACPI_BITREG_WAKE_STATUS, &in_value, ACPI_MTX_DO_NOT_LOCK);
 456                 if (ACPI_FAILURE (status)) {
 457                         return_ACPI_STATUS (status);
 458                 }
 459         } while (!in_value);
 460
 461         return_ACPI_STATUS (AE_OK);
 462 }
 463 EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios);
 464
 465
 466 /******************************************************************************
 467  *
 468  * FUNCTION:    acpi_leave_sleep_state
 469  *
 470  * PARAMETERS:  sleep_state         - Which sleep state we just exited
 471  *
 472  * RETURN:      Status
 473  *
 474  * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
 475  *              Called with interrupts ENABLED.
 476  *
 477  ******************************************************************************/
 478
 479 acpi_status
 480 acpi_leave_sleep_state (
 481         u8                              sleep_state)
 482 {
 483         struct acpi_object_list         arg_list;
 484         union acpi_object               arg;
 485         acpi_status                     status;
 486         struct acpi_bit_register_info   *sleep_type_reg_info;
 487         struct acpi_bit_register_info   *sleep_enable_reg_info;
 488         u32                             PM1Acontrol;
 489         u32                             PM1Bcontrol;
 490
 491
 492         ACPI_FUNCTION_TRACE ("acpi_leave_sleep_state");
 493
 494
 495         /*
 496          * Set SLP_TYPE and SLP_EN to state S0.
 497          * This is unclear from the ACPI Spec, but it is required
 498          * by some machines.
 499          */
 500         status = acpi_get_sleep_type_data (ACPI_STATE_S0,
 501                           &acpi_gbl_sleep_type_a, &acpi_gbl_sleep_type_b);
 502         if (ACPI_SUCCESS (status)) {
 503                 sleep_type_reg_info = acpi_hw_get_bit_register_info (ACPI_BITREG_SLEEP_TYPE_A);
 504                 sleep_enable_reg_info = acpi_hw_get_bit_register_info (ACPI_BITREG_SLEEP_ENABLE);
 505
 506                 /* Get current value of PM1A control */
 507
 508                 status = acpi_hw_register_read (ACPI_MTX_DO_NOT_LOCK,
 509                                  ACPI_REGISTER_PM1_CONTROL, &PM1Acontrol);
 510                 if (ACPI_SUCCESS (status)) {
 511                         /* Clear SLP_EN and SLP_TYP fields */
 512
 513                         PM1Acontrol &= ~(sleep_type_reg_info->access_bit_mask |
 514                                            sleep_enable_reg_info->access_bit_mask);
 515                         PM1Bcontrol = PM1Acontrol;
 516
 517                         /* Insert SLP_TYP bits */
 518
 519                         PM1Acontrol |= (acpi_gbl_sleep_type_a << sleep_type_reg_info->bit_position);
 520                         PM1Bcontrol |= (acpi_gbl_sleep_type_b << sleep_type_reg_info->bit_position);
 521
 522                         /* Just ignore any errors */
 523
 524                         (void) acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK,
 525                                           ACPI_REGISTER_PM1A_CONTROL, PM1Acontrol);
 526                         (void) acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK,
 527                                           ACPI_REGISTER_PM1B_CONTROL, PM1Bcontrol);
 528                 }
 529         }
 530
 531         /* Ensure enter_sleep_state_prep -> enter_sleep_state ordering */
 532
 533         acpi_gbl_sleep_type_a = ACPI_SLEEP_TYPE_INVALID;
 534
 535         /* Setup parameter object */
 536
 537         arg_list.count = 1;
 538         arg_list.pointer = &arg;
 539         arg.type = ACPI_TYPE_INTEGER;
 540
 541         /* Ignore any errors from these methods */
 542
 543         arg.integer.value = ACPI_SST_WAKING;
 544         status = acpi_evaluate_object (NULL, METHOD_NAME__SST, &arg_list, NULL);
 545         if (ACPI_FAILURE (status) && status != AE_NOT_FOUND) {
 546                 ACPI_REPORT_ERROR (("Method _SST failed, %s\n", acpi_format_exception (status)));
 547         }
 548
 549         arg.integer.value = sleep_state;
 550         status = acpi_evaluate_object (NULL, METHOD_NAME__BFS, &arg_list, NULL);
 551         if (ACPI_FAILURE (status) && status != AE_NOT_FOUND) {
 552                 ACPI_REPORT_ERROR (("Method _BFS failed, %s\n", acpi_format_exception (status)));
 553         }
 554
 555         status = acpi_evaluate_object (NULL, METHOD_NAME__WAK, &arg_list, NULL);
 556         if (ACPI_FAILURE (status) && status != AE_NOT_FOUND) {
 557                 ACPI_REPORT_ERROR (("Method _WAK failed, %s\n", acpi_format_exception (status)));
 558         }
 559         /* TBD: _WAK "sometimes" returns stuff - do we want to look at it? */
 560
 561         /*
 562          * Restore the GPEs:
 563          * 1) Disable/Clear all GPEs
 564          * 2) Enable all runtime GPEs
 565          */
 566         status = acpi_hw_disable_all_gpes (ACPI_NOT_ISR);
 567         if (ACPI_FAILURE (status)) {
 568                 return_ACPI_STATUS (status);
 569         }
 570         acpi_gbl_system_awake_and_running = TRUE;
 571
 572         status = acpi_hw_enable_all_runtime_gpes (ACPI_NOT_ISR);
 573         if (ACPI_FAILURE (status)) {
 574                 return_ACPI_STATUS (status);
 575         }
 576
 577         /* Enable power button */
 578
 579         (void) acpi_set_register(acpi_gbl_fixed_event_info[ACPI_EVENT_POWER_BUTTON].enable_register_id,
 580                         1, ACPI_MTX_DO_NOT_LOCK);
 581         (void) acpi_set_register(acpi_gbl_fixed_event_info[ACPI_EVENT_POWER_BUTTON].status_register_id,
 582                         1, ACPI_MTX_DO_NOT_LOCK);
 583
 584         /* Enable BM arbitration */
 585
 586         status = acpi_set_register (ACPI_BITREG_ARB_DISABLE, 0, ACPI_MTX_LOCK);
 587         if (ACPI_FAILURE (status)) {
 588                 return_ACPI_STATUS (status);
 589         }
 590
 591         arg.integer.value = ACPI_SST_WORKING;
 592         status = acpi_evaluate_object (NULL, METHOD_NAME__SST, &arg_list, NULL);
 593         if (ACPI_FAILURE (status) && status != AE_NOT_FOUND) {
 594                 ACPI_REPORT_ERROR (("Method _SST failed, %s\n", acpi_format_exception (status)));
 595         }
 596
 597         return_ACPI_STATUS (status);
 598 }