drivers/ide/ide-acpi.c

   1 /*
   2  * Provides ACPI support for IDE drives.
   3  *
   4  * Copyright (C) 2005 Intel Corp.
   5  * Copyright (C) 2005 Randy Dunlap
   6  * Copyright (C) 2006 SUSE Linux Products GmbH
   7  * Copyright (C) 2006 Hannes Reinecke
   8  */
   9
  10 #include <linux/acpi.h>
  11 #include <linux/ata.h>
  12 #include <linux/delay.h>
  13 #include <linux/device.h>
  14 #include <linux/errno.h>
  15 #include <linux/kernel.h>
  16 #include <linux/slab.h>
  17 #include <linux/ide.h>
  18 #include <linux/pci.h>
  19 #include <linux/dmi.h>
  20 #include <linux/module.h>
  21
  22 #define REGS_PER_GTF            7
  23
  24 struct GTM_buffer {
  25         u32     PIO_speed0;
  26         u32     DMA_speed0;
  27         u32     PIO_speed1;
  28         u32     DMA_speed1;
  29         u32     GTM_flags;
  30 };
  31
  32 struct ide_acpi_drive_link {
  33         acpi_handle      obj_handle;
  34         u8               idbuff[512];
  35 };
  36
  37 struct ide_acpi_hwif_link {
  38         ide_hwif_t                      *hwif;
  39         acpi_handle                      obj_handle;
  40         struct GTM_buffer                gtm;
  41         struct ide_acpi_drive_link       master;
  42         struct ide_acpi_drive_link       slave;
  43 };
  44
  45 #undef DEBUGGING
  46 /* note: adds function name and KERN_DEBUG */
  47 #ifdef DEBUGGING
  48 #define DEBPRINT(fmt, args...)  \
  49                 printk(KERN_DEBUG "%s: " fmt, __func__, ## args)
  50 #else
  51 #define DEBPRINT(fmt, args...)  do {} while (0)
  52 #endif  /* DEBUGGING */
  53
  54 static bool ide_noacpi;
  55 module_param_named(noacpi, ide_noacpi, bool, 0);
  56 MODULE_PARM_DESC(noacpi, "disable IDE ACPI support");
  57
  58 static bool ide_acpigtf;
  59 module_param_named(acpigtf, ide_acpigtf, bool, 0);
  60 MODULE_PARM_DESC(acpigtf, "enable IDE ACPI _GTF support");
  61
  62 static bool ide_acpionboot;
  63 module_param_named(acpionboot, ide_acpionboot, bool, 0);
  64 MODULE_PARM_DESC(acpionboot, "call IDE ACPI methods on boot");
  65
  66 static bool ide_noacpi_psx;
  67 static int no_acpi_psx(const struct dmi_system_id *id)
  68 {
  69         ide_noacpi_psx = true;
  70         printk(KERN_NOTICE"%s detected - disable ACPI _PSx.\n", id->ident);
  71         return 0;
  72 }
  73
  74 static const struct dmi_system_id ide_acpi_dmi_table[] = {
  75         /* Bug 9673. */
  76         /* We should check if this is because ACPI NVS isn't save/restored. */
  77         {
  78                 .callback = no_acpi_psx,
  79                 .ident    = "HP nx9005",
  80                 .matches  = {
  81                         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies Ltd."),
  82                         DMI_MATCH(DMI_BIOS_VERSION, "KAM1.60")
  83                 },
  84         },
  85
  86         { }     /* terminate list */
  87 };
  88
  89 int ide_acpi_init(void)
  90 {
  91         dmi_check_system(ide_acpi_dmi_table);
  92         return 0;
  93 }
  94
  95 bool ide_port_acpi(ide_hwif_t *hwif)
  96 {
  97         return ide_noacpi == 0 && hwif->acpidata;
  98 }
  99
 100 static acpi_handle acpi_get_child(acpi_handle handle, u64 addr)
 101 {
 102         struct acpi_device *adev;
 103
 104         if (!handle || acpi_bus_get_device(handle, &adev))
 105                 return NULL;
 106
 107         adev = acpi_find_child_device(adev, addr, false);
 108         return adev ? adev->handle : NULL;
 109 }
 110
 111 /**
 112  * ide_get_dev_handle - finds acpi_handle and PCI device.function
 113  * @dev: device to locate
 114  * @handle: returned acpi_handle for @dev
 115  * @pcidevfn: return PCI device.func for @dev
 116  *
 117  * Returns the ACPI object handle to the corresponding PCI device.
 118  *
 119  * Returns 0 on success, <0 on error.
 120  */
 121 static int ide_get_dev_handle(struct device *dev, acpi_handle *handle,
 122                                u64 *pcidevfn)
 123 {
 124         struct pci_dev *pdev = to_pci_dev(dev);
 125         unsigned int bus, devnum, func;
 126         u64 addr;
 127         acpi_handle dev_handle;
 128         acpi_status status;
 129         struct acpi_device_info *dinfo = NULL;
 130         int ret = -ENODEV;
 131
 132         bus = pdev->bus->number;
 133         devnum = PCI_SLOT(pdev->devfn);
 134         func = PCI_FUNC(pdev->devfn);
 135         /* ACPI _ADR encoding for PCI bus: */
 136         addr = (u64)(devnum << 16 | func);
 137
 138         DEBPRINT("ENTER: pci %02x:%02x.%01x\n", bus, devnum, func);
 139
 140         dev_handle = ACPI_HANDLE(dev);
 141         if (!dev_handle) {
 142                 DEBPRINT("no acpi handle for device\n");
 143                 goto err;
 144         }
 145
 146         status = acpi_get_object_info(dev_handle, &dinfo);
 147         if (ACPI_FAILURE(status)) {
 148                 DEBPRINT("get_object_info for device failed\n");
 149                 goto err;
 150         }
 151         if (dinfo && (dinfo->valid & ACPI_VALID_ADR) &&
 152             dinfo->address == addr) {
 153                 *pcidevfn = addr;
 154                 *handle = dev_handle;
 155         } else {
 156                 DEBPRINT("get_object_info for device has wrong "
 157                         " address: %llu, should be %u\n",
 158                         dinfo ? (unsigned long long)dinfo->address : -1ULL,
 159                         (unsigned int)addr);
 160                 goto err;
 161         }
 162
 163         DEBPRINT("for dev=0x%x.%x, addr=0x%llx, *handle=0x%p\n",
 164                  devnum, func, (unsigned long long)addr, *handle);
 165         ret = 0;
 166 err:
 167         kfree(dinfo);
 168         return ret;
 169 }
 170
 171 /**
 172  * ide_acpi_hwif_get_handle - Get ACPI object handle for a given hwif
 173  * @hwif: device to locate
 174  *
 175  * Retrieves the object handle for a given hwif.
 176  *
 177  * Returns handle on success, 0 on error.
 178  */
 179 static acpi_handle ide_acpi_hwif_get_handle(ide_hwif_t *hwif)
 180 {
 181         struct device           *dev = hwif->gendev.parent;
 182         acpi_handle             uninitialized_var(dev_handle);
 183         u64                     pcidevfn;
 184         acpi_handle             chan_handle;
 185         int                     err;
 186
 187         DEBPRINT("ENTER: device %s\n", hwif->name);
 188
 189         if (!dev) {
 190                 DEBPRINT("no PCI device for %s\n", hwif->name);
 191                 return NULL;
 192         }
 193
 194         err = ide_get_dev_handle(dev, &dev_handle, &pcidevfn);
 195         if (err < 0) {
 196                 DEBPRINT("ide_get_dev_handle failed (%d)\n", err);
 197                 return NULL;
 198         }
 199
 200         /* get child objects of dev_handle == channel objects,
 201          * + _their_ children == drive objects */
 202         /* channel is hwif->channel */
 203         chan_handle = acpi_get_child(dev_handle, hwif->channel);
 204         DEBPRINT("chan adr=%d: handle=0x%p\n",
 205                  hwif->channel, chan_handle);
 206
 207         return chan_handle;
 208 }
 209
 210 /**
 211  * do_drive_get_GTF - get the drive bootup default taskfile settings
 212  * @drive: the drive for which the taskfile settings should be retrieved
 213  * @gtf_length: number of bytes of _GTF data returned at @gtf_address
 214  * @gtf_address: buffer containing _GTF taskfile arrays
 215  *
 216  * The _GTF method has no input parameters.
 217  * It returns a variable number of register set values (registers
 218  * hex 1F1..1F7, taskfiles).
 219  * The <variable number> is not known in advance, so have ACPI-CA
 220  * allocate the buffer as needed and return it, then free it later.
 221  *
 222  * The returned @gtf_length and @gtf_address are only valid if the
 223  * function return value is 0.
 224  */
 225 static int do_drive_get_GTF(ide_drive_t *drive,
 226                      unsigned int *gtf_length, unsigned long *gtf_address,
 227                      unsigned long *obj_loc)
 228 {
 229         acpi_status                     status;
 230         struct acpi_buffer              output;
 231         union acpi_object               *out_obj;
 232         int                             err = -ENODEV;
 233
 234         *gtf_length = 0;
 235         *gtf_address = 0UL;
 236         *obj_loc = 0UL;
 237
 238         if (!drive->acpidata->obj_handle) {
 239                 DEBPRINT("No ACPI object found for %s\n", drive->name);
 240                 goto out;
 241         }
 242
 243         /* Setting up output buffer */
 244         output.length = ACPI_ALLOCATE_BUFFER;
 245         output.pointer = NULL;  /* ACPI-CA sets this; save/free it later */
 246
 247         /* _GTF has no input parameters */
 248         err = -EIO;
 249         status = acpi_evaluate_object(drive->acpidata->obj_handle, "_GTF",
 250                                       NULL, &output);
 251         if (ACPI_FAILURE(status)) {
 252                 printk(KERN_DEBUG
 253                        "%s: Run _GTF error: status = 0x%x\n",
 254                        __func__, status);
 255                 goto out;
 256         }
 257
 258         if (!output.length || !output.pointer) {
 259                 DEBPRINT("Run _GTF: "
 260                        "length or ptr is NULL (0x%llx, 0x%p)\n",
 261                        (unsigned long long)output.length,
 262                        output.pointer);
 263                 goto out;
 264         }
 265
 266         out_obj = output.pointer;
 267         if (out_obj->type != ACPI_TYPE_BUFFER) {
 268                 DEBPRINT("Run _GTF: error: "
 269                        "expected object type of ACPI_TYPE_BUFFER, "
 270                        "got 0x%x\n", out_obj->type);
 271                 err = -ENOENT;
 272                 kfree(output.pointer);
 273                 goto out;
 274         }
 275
 276         if (!out_obj->buffer.length || !out_obj->buffer.pointer ||
 277             out_obj->buffer.length % REGS_PER_GTF) {
 278                 printk(KERN_ERR
 279                        "%s: unexpected GTF length (%d) or addr (0x%p)\n",
 280                        __func__, out_obj->buffer.length,
 281                        out_obj->buffer.pointer);
 282                 err = -ENOENT;
 283                 kfree(output.pointer);
 284                 goto out;
 285         }
 286
 287         *gtf_length = out_obj->buffer.length;
 288         *gtf_address = (unsigned long)out_obj->buffer.pointer;
 289         *obj_loc = (unsigned long)out_obj;
 290         DEBPRINT("returning gtf_length=%d, gtf_address=0x%lx, obj_loc=0x%lx\n",
 291                  *gtf_length, *gtf_address, *obj_loc);
 292         err = 0;
 293 out:
 294         return err;
 295 }
 296
 297 /**
 298  * do_drive_set_taskfiles - write the drive taskfile settings from _GTF
 299  * @drive: the drive to which the taskfile command should be sent
 300  * @gtf_length: total number of bytes of _GTF taskfiles
 301  * @gtf_address: location of _GTF taskfile arrays
 302  *
 303  * Write {gtf_address, length gtf_length} in groups of
 304  * REGS_PER_GTF bytes.
 305  */
 306 static int do_drive_set_taskfiles(ide_drive_t *drive,
 307                                   unsigned int gtf_length,
 308                                   unsigned long gtf_address)
 309 {
 310         int                     rc = 0, err;
 311         int                     gtf_count = gtf_length / REGS_PER_GTF;
 312         int                     ix;
 313
 314         DEBPRINT("total GTF bytes=%u (0x%x), gtf_count=%d, addr=0x%lx\n",
 315                  gtf_length, gtf_length, gtf_count, gtf_address);
 316
 317         /* send all taskfile registers (0x1f1-0x1f7) *in*that*order* */
 318         for (ix = 0; ix < gtf_count; ix++) {
 319                 u8 *gtf = (u8 *)(gtf_address + ix * REGS_PER_GTF);
 320                 struct ide_cmd cmd;
 321
 322                 DEBPRINT("(0x1f1-1f7): "
 323                          "hex: %02x %02x %02x %02x %02x %02x %02x\n",
 324                          gtf[0], gtf[1], gtf[2],
 325                          gtf[3], gtf[4], gtf[5], gtf[6]);
 326
 327                 if (!ide_acpigtf) {
 328                         DEBPRINT("_GTF execution disabled\n");
 329                         continue;
 330                 }
 331
 332                 /* convert GTF to taskfile */
 333                 memset(&cmd, 0, sizeof(cmd));
 334                 memcpy(&cmd.tf.feature, gtf, REGS_PER_GTF);
 335                 cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
 336                 cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
 337
 338                 err = ide_no_data_taskfile(drive, &cmd);
 339                 if (err) {
 340                         printk(KERN_ERR "%s: ide_no_data_taskfile failed: %u\n",
 341                                         __func__, err);
 342                         rc = err;
 343                 }
 344         }
 345
 346         return rc;
 347 }
 348
 349 /**
 350  * ide_acpi_exec_tfs - get then write drive taskfile settings
 351  * @drive: the drive for which the taskfile settings should be
 352  *         written.
 353  *
 354  * According to the ACPI spec this should be called after _STM
 355  * has been evaluated for the interface. Some ACPI vendors interpret
 356  * that as a hard requirement and modify the taskfile according
 357  * to the Identify Drive information passed down with _STM.
 358  * So one should really make sure to call this only after _STM has
 359  * been executed.
 360  */
 361 int ide_acpi_exec_tfs(ide_drive_t *drive)
 362 {
 363         int             ret;
 364         unsigned int    gtf_length;
 365         unsigned long   gtf_address;
 366         unsigned long   obj_loc;
 367
 368         DEBPRINT("call get_GTF, drive=%s port=%d\n", drive->name, drive->dn);
 369
 370         ret = do_drive_get_GTF(drive, &gtf_length, &gtf_address, &obj_loc);
 371         if (ret < 0) {
 372                 DEBPRINT("get_GTF error (%d)\n", ret);
 373                 return ret;
 374         }
 375
 376         DEBPRINT("call set_taskfiles, drive=%s\n", drive->name);
 377
 378         ret = do_drive_set_taskfiles(drive, gtf_length, gtf_address);
 379         kfree((void *)obj_loc);
 380         if (ret < 0) {
 381                 DEBPRINT("set_taskfiles error (%d)\n", ret);
 382         }
 383
 384         DEBPRINT("ret=%d\n", ret);
 385
 386         return ret;
 387 }
 388
 389 /**
 390  * ide_acpi_get_timing - get the channel (controller) timings
 391  * @hwif: target IDE interface (channel)
 392  *
 393  * This function executes the _GTM ACPI method for the target channel.
 394  *
 395  */
 396 void ide_acpi_get_timing(ide_hwif_t *hwif)
 397 {
 398         acpi_status             status;
 399         struct acpi_buffer      output;
 400         union acpi_object       *out_obj;
 401
 402         /* Setting up output buffer for _GTM */
 403         output.length = ACPI_ALLOCATE_BUFFER;
 404         output.pointer = NULL;  /* ACPI-CA sets this; save/free it later */
 405
 406         /* _GTM has no input parameters */
 407         status = acpi_evaluate_object(hwif->acpidata->obj_handle, "_GTM",
 408                                       NULL, &output);
 409
 410         DEBPRINT("_GTM status: %d, outptr: 0x%p, outlen: 0x%llx\n",
 411                  status, output.pointer,
 412                  (unsigned long long)output.length);
 413
 414         if (ACPI_FAILURE(status)) {
 415                 DEBPRINT("Run _GTM error: status = 0x%x\n", status);
 416                 return;
 417         }
 418
 419         if (!output.length || !output.pointer) {
 420                 DEBPRINT("Run _GTM: length or ptr is NULL (0x%llx, 0x%p)\n",
 421                        (unsigned long long)output.length,
 422                        output.pointer);
 423                 kfree(output.pointer);
 424                 return;
 425         }
 426
 427         out_obj = output.pointer;
 428         if (out_obj->type != ACPI_TYPE_BUFFER) {
 429                 DEBPRINT("Run _GTM: error: "
 430                        "expected object type of ACPI_TYPE_BUFFER, "
 431                        "got 0x%x\n", out_obj->type);
 432                 kfree(output.pointer);
 433                 return;
 434         }
 435
 436         if (!out_obj->buffer.length || !out_obj->buffer.pointer ||
 437             out_obj->buffer.length != sizeof(struct GTM_buffer)) {
 438                 printk(KERN_ERR
 439                         "%s: unexpected _GTM length (0x%x)[should be 0x%zx] or "
 440                         "addr (0x%p)\n",
 441                         __func__, out_obj->buffer.length,
 442                         sizeof(struct GTM_buffer), out_obj->buffer.pointer);
 443                 kfree(output.pointer);
 444                 return;
 445         }
 446
 447         memcpy(&hwif->acpidata->gtm, out_obj->buffer.pointer,
 448                sizeof(struct GTM_buffer));
 449
 450         DEBPRINT("_GTM info: ptr: 0x%p, len: 0x%x, exp.len: 0x%Zx\n",
 451                  out_obj->buffer.pointer, out_obj->buffer.length,
 452                  sizeof(struct GTM_buffer));
 453
 454         DEBPRINT("_GTM fields: 0x%x, 0x%x, 0x%x, 0x%x, 0x%x\n",
 455                  hwif->acpidata->gtm.PIO_speed0,
 456                  hwif->acpidata->gtm.DMA_speed0,
 457                  hwif->acpidata->gtm.PIO_speed1,
 458                  hwif->acpidata->gtm.DMA_speed1,
 459                  hwif->acpidata->gtm.GTM_flags);
 460
 461         kfree(output.pointer);
 462 }
 463
 464 /**
 465  * ide_acpi_push_timing - set the channel (controller) timings
 466  * @hwif: target IDE interface (channel)
 467  *
 468  * This function executes the _STM ACPI method for the target channel.
 469  *
 470  * _STM requires Identify Drive data, which has to passed as an argument.
 471  * Unfortunately drive->id is a mangled version which we can't readily
 472  * use; hence we'll get the information afresh.
 473  */
 474 void ide_acpi_push_timing(ide_hwif_t *hwif)
 475 {
 476         acpi_status             status;
 477         struct acpi_object_list input;
 478         union acpi_object       in_params[3];
 479         struct ide_acpi_drive_link      *master = &hwif->acpidata->master;
 480         struct ide_acpi_drive_link      *slave = &hwif->acpidata->slave;
 481
 482         /* Give the GTM buffer + drive Identify data to the channel via the
 483          * _STM method: */
 484         /* setup input parameters buffer for _STM */
 485         input.count = 3;
 486         input.pointer = in_params;
 487         in_params[0].type = ACPI_TYPE_BUFFER;
 488         in_params[0].buffer.length = sizeof(struct GTM_buffer);
 489         in_params[0].buffer.pointer = (u8 *)&hwif->acpidata->gtm;
 490         in_params[1].type = ACPI_TYPE_BUFFER;
 491         in_params[1].buffer.length = ATA_ID_WORDS * 2;
 492         in_params[1].buffer.pointer = (u8 *)&master->idbuff;
 493         in_params[2].type = ACPI_TYPE_BUFFER;
 494         in_params[2].buffer.length = ATA_ID_WORDS * 2;
 495         in_params[2].buffer.pointer = (u8 *)&slave->idbuff;
 496         /* Output buffer: _STM has no output */
 497
 498         status = acpi_evaluate_object(hwif->acpidata->obj_handle, "_STM",
 499                                       &input, NULL);
 500
 501         if (ACPI_FAILURE(status)) {
 502                 DEBPRINT("Run _STM error: status = 0x%x\n", status);
 503         }
 504         DEBPRINT("_STM status: %d\n", status);
 505 }
 506
 507 /**
 508  * ide_acpi_set_state - set the channel power state
 509  * @hwif: target IDE interface
 510  * @on: state, on/off
 511  *
 512  * This function executes the _PS0/_PS3 ACPI method to set the power state.
 513  * ACPI spec requires _PS0 when IDE power on and _PS3 when power off
 514  */
 515 void ide_acpi_set_state(ide_hwif_t *hwif, int on)
 516 {
 517         ide_drive_t *drive;
 518         int i;
 519
 520         if (ide_noacpi_psx)
 521                 return;
 522
 523         DEBPRINT("ENTER:\n");
 524
 525         /* channel first and then drives for power on and verse versa for power off */
 526         if (on)
 527                 acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D0);
 528
 529         ide_port_for_each_present_dev(i, drive, hwif) {
 530                 if (drive->acpidata->obj_handle)
 531                         acpi_bus_set_power(drive->acpidata->obj_handle,
 532                                 on ? ACPI_STATE_D0 : ACPI_STATE_D3_COLD);
 533         }
 534
 535         if (!on)
 536                 acpi_bus_set_power(hwif->acpidata->obj_handle,
 537                                    ACPI_STATE_D3_COLD);
 538 }
 539
 540 /**
 541  * ide_acpi_init_port - initialize the ACPI link for an IDE interface
 542  * @hwif: target IDE interface (channel)
 543  *
 544  * The ACPI spec is not quite clear when the drive identify buffer
 545  * should be obtained. Calling IDENTIFY DEVICE during shutdown
 546  * is not the best of ideas as the drive might already being put to
 547  * sleep. And obviously we can't call it during resume.
 548  * So we get the information during startup; but this means that
 549  * any changes during run-time will be lost after resume.
 550  */
 551 void ide_acpi_init_port(ide_hwif_t *hwif)
 552 {
 553         hwif->acpidata = kzalloc(sizeof(struct ide_acpi_hwif_link), GFP_KERNEL);
 554         if (!hwif->acpidata)
 555                 return;
 556
 557         hwif->acpidata->obj_handle = ide_acpi_hwif_get_handle(hwif);
 558         if (!hwif->acpidata->obj_handle) {
 559                 DEBPRINT("no ACPI object for %s found\n", hwif->name);
 560                 kfree(hwif->acpidata);
 561                 hwif->acpidata = NULL;
 562         }
 563 }
 564
 565 void ide_acpi_port_init_devices(ide_hwif_t *hwif)
 566 {
 567         ide_drive_t *drive;
 568         int i, err;
 569
 570         if (hwif->acpidata == NULL)
 571                 return;
 572
 573         /*
 574          * The ACPI spec mandates that we send information
 575          * for both drives, regardless whether they are connected
 576          * or not.
 577          */
 578         hwif->devices[0]->acpidata = &hwif->acpidata->master;
 579         hwif->devices[1]->acpidata = &hwif->acpidata->slave;
 580
 581         /* get _ADR info for each device */
 582         ide_port_for_each_present_dev(i, drive, hwif) {
 583                 acpi_handle dev_handle;
 584
 585                 DEBPRINT("ENTER: %s at channel#: %d port#: %d\n",
 586                          drive->name, hwif->channel, drive->dn & 1);
 587
 588                 /* TBD: could also check ACPI object VALID bits */
 589                 dev_handle = acpi_get_child(hwif->acpidata->obj_handle,
 590                                             drive->dn & 1);
 591
 592                 DEBPRINT("drive %s handle 0x%p\n", drive->name, dev_handle);
 593
 594                 drive->acpidata->obj_handle = dev_handle;
 595         }
 596
 597         /* send IDENTIFY for each device */
 598         ide_port_for_each_present_dev(i, drive, hwif) {
 599                 err = taskfile_lib_get_identify(drive, drive->acpidata->idbuff);
 600                 if (err)
 601                         DEBPRINT("identify device %s failed (%d)\n",
 602                                  drive->name, err);
 603         }
 604
 605         if (ide_noacpi || ide_acpionboot == 0) {
 606                 DEBPRINT("ACPI methods disabled on boot\n");
 607                 return;
 608         }
 609
 610         /* ACPI _PS0 before _STM */
 611         ide_acpi_set_state(hwif, 1);
 612         /*
 613          * ACPI requires us to call _STM on startup
 614          */
 615         ide_acpi_get_timing(hwif);
 616         ide_acpi_push_timing(hwif);
 617
 618         ide_port_for_each_present_dev(i, drive, hwif) {
 619                 ide_acpi_exec_tfs(drive);
 620         }
 621 }