3 * Provides ACPI support for PATA/SATA.
5 * Copyright (C) 2006 Intel Corp.
6 * Copyright (C) 2006 Randy Dunlap
9 #include <linux/module.h>
10 #include <linux/ata.h>
11 #include <linux/delay.h>
12 #include <linux/device.h>
13 #include <linux/errno.h>
14 #include <linux/kernel.h>
15 #include <linux/acpi.h>
16 #include <linux/libata.h>
17 #include <linux/pci.h>
18 #include <scsi/scsi_device.h>
21 #include <acpi/acpi_bus.h>
22 #include <acpi/acnames.h>
23 #include <acpi/acnamesp.h>
24 #include <acpi/acparser.h>
25 #include <acpi/acexcep.h>
26 #include <acpi/acmacros.h>
27 #include <acpi/actypes.h>
30 ATA_ACPI_FILTER_SETXFER = 1 << 0,
31 ATA_ACPI_FILTER_LOCK = 1 << 1,
33 ATA_ACPI_FILTER_DEFAULT = ATA_ACPI_FILTER_SETXFER |
37 static unsigned int ata_acpi_gtf_filter = ATA_ACPI_FILTER_DEFAULT;
38 module_param_named(acpi_gtf_filter, ata_acpi_gtf_filter, int, 0644);
39 MODULE_PARM_DESC(acpi_gtf_filter, "filter mask for ACPI _GTF commands, set to filter out (0x1=set xfermode, 0x2=lock/freeze lock)");
41 #define NO_PORT_MULT 0xffff
42 #define SATA_ADR(root, pmp) (((root) << 16) | (pmp))
44 #define REGS_PER_GTF 7
46 u8 tf[REGS_PER_GTF]; /* regs. 0x1f1 - 0x1f7 */
50 * Helper - belongs in the PCI layer somewhere eventually
52 static int is_pci_dev(struct device *dev)
54 return (dev->bus == &pci_bus_type);
57 static void ata_acpi_clear_gtf(struct ata_device *dev)
59 kfree(dev->gtf_cache);
60 dev->gtf_cache = NULL;
64 * ata_acpi_associate_sata_port - associate SATA port with ACPI objects
65 * @ap: target SATA port
67 * Look up ACPI objects associated with @ap and initialize acpi_handle
68 * fields of @ap, the port and devices accordingly.
74 * 0 on success, -errno on failure.
76 void ata_acpi_associate_sata_port(struct ata_port *ap)
78 WARN_ON(!(ap->flags & ATA_FLAG_ACPI_SATA));
80 if (!ap->nr_pmp_links) {
81 acpi_integer adr = SATA_ADR(ap->port_no, NO_PORT_MULT);
83 ap->link.device->acpi_handle =
84 acpi_get_child(ap->host->acpi_handle, adr);
86 struct ata_link *link;
88 ap->link.device->acpi_handle = NULL;
90 ata_port_for_each_link(link, ap) {
91 acpi_integer adr = SATA_ADR(ap->port_no, link->pmp);
93 link->device->acpi_handle =
94 acpi_get_child(ap->host->acpi_handle, adr);
99 static void ata_acpi_associate_ide_port(struct ata_port *ap)
103 ap->acpi_handle = acpi_get_child(ap->host->acpi_handle, ap->port_no);
104 if (!ap->acpi_handle)
108 if (ap->flags & ATA_FLAG_SLAVE_POSS)
111 for (i = 0; i < max_devices; i++) {
112 struct ata_device *dev = &ap->link.device[i];
114 dev->acpi_handle = acpi_get_child(ap->acpi_handle, i);
117 if (ata_acpi_gtm(ap, &ap->__acpi_init_gtm) == 0)
118 ap->pflags |= ATA_PFLAG_INIT_GTM_VALID;
121 static void ata_acpi_handle_hotplug(struct ata_port *ap, struct kobject *kobj,
124 char event_string[12];
125 char *envp[] = { event_string, NULL };
126 struct ata_eh_info *ehi = &ap->link.eh_info;
128 if (event == 0 || event == 1) {
130 spin_lock_irqsave(ap->lock, flags);
131 ata_ehi_clear_desc(ehi);
132 ata_ehi_push_desc(ehi, "ACPI event");
133 ata_ehi_hotplugged(ehi);
135 spin_unlock_irqrestore(ap->lock, flags);
139 sprintf(event_string, "BAY_EVENT=%d", event);
140 kobject_uevent_env(kobj, KOBJ_CHANGE, envp);
144 static void ata_acpi_dev_notify(acpi_handle handle, u32 event, void *data)
146 struct ata_device *dev = data;
147 struct kobject *kobj = NULL;
150 kobj = &dev->sdev->sdev_gendev.kobj;
152 ata_acpi_handle_hotplug(dev->link->ap, kobj, event);
155 static void ata_acpi_ap_notify(acpi_handle handle, u32 event, void *data)
157 struct ata_port *ap = data;
159 ata_acpi_handle_hotplug(ap, &ap->dev->kobj, event);
163 * ata_acpi_associate - associate ATA host with ACPI objects
164 * @host: target ATA host
166 * Look up ACPI objects associated with @host and initialize
167 * acpi_handle fields of @host, its ports and devices accordingly.
173 * 0 on success, -errno on failure.
175 void ata_acpi_associate(struct ata_host *host)
179 if (!is_pci_dev(host->dev) || libata_noacpi)
182 host->acpi_handle = DEVICE_ACPI_HANDLE(host->dev);
183 if (!host->acpi_handle)
186 for (i = 0; i < host->n_ports; i++) {
187 struct ata_port *ap = host->ports[i];
189 if (host->ports[0]->flags & ATA_FLAG_ACPI_SATA)
190 ata_acpi_associate_sata_port(ap);
192 ata_acpi_associate_ide_port(ap);
195 acpi_install_notify_handler (ap->acpi_handle,
200 for (j = 0; j < ata_link_max_devices(&ap->link); j++) {
201 struct ata_device *dev = &ap->link.device[j];
203 if (dev->acpi_handle)
204 acpi_install_notify_handler (dev->acpi_handle,
213 * ata_acpi_dissociate - dissociate ATA host from ACPI objects
214 * @host: target ATA host
216 * This function is called during driver detach after the whole host
222 void ata_acpi_dissociate(struct ata_host *host)
226 /* Restore initial _GTM values so that driver which attaches
227 * afterward can use them too.
229 for (i = 0; i < host->n_ports; i++) {
230 struct ata_port *ap = host->ports[i];
231 const struct ata_acpi_gtm *gtm = ata_acpi_init_gtm(ap);
233 if (ap->acpi_handle && gtm)
234 ata_acpi_stm(ap, gtm);
239 * ata_acpi_gtm - execute _GTM
240 * @ap: target ATA port
241 * @gtm: out parameter for _GTM result
243 * Evaluate _GTM and store the result in @gtm.
249 * 0 on success, -ENOENT if _GTM doesn't exist, -errno on failure.
251 int ata_acpi_gtm(struct ata_port *ap, struct ata_acpi_gtm *gtm)
253 struct acpi_buffer output = { .length = ACPI_ALLOCATE_BUFFER };
254 union acpi_object *out_obj;
258 status = acpi_evaluate_object(ap->acpi_handle, "_GTM", NULL, &output);
261 if (status == AE_NOT_FOUND)
265 if (ACPI_FAILURE(status)) {
266 ata_port_printk(ap, KERN_ERR,
267 "ACPI get timing mode failed (AE 0x%x)\n",
272 out_obj = output.pointer;
273 if (out_obj->type != ACPI_TYPE_BUFFER) {
274 ata_port_printk(ap, KERN_WARNING,
275 "_GTM returned unexpected object type 0x%x\n",
281 if (out_obj->buffer.length != sizeof(struct ata_acpi_gtm)) {
282 ata_port_printk(ap, KERN_ERR,
283 "_GTM returned invalid length %d\n",
284 out_obj->buffer.length);
288 memcpy(gtm, out_obj->buffer.pointer, sizeof(struct ata_acpi_gtm));
291 kfree(output.pointer);
295 EXPORT_SYMBOL_GPL(ata_acpi_gtm);
298 * ata_acpi_stm - execute _STM
299 * @ap: target ATA port
300 * @stm: timing parameter to _STM
302 * Evaluate _STM with timing parameter @stm.
308 * 0 on success, -ENOENT if _STM doesn't exist, -errno on failure.
310 int ata_acpi_stm(struct ata_port *ap, const struct ata_acpi_gtm *stm)
313 struct ata_acpi_gtm stm_buf = *stm;
314 struct acpi_object_list input;
315 union acpi_object in_params[3];
317 in_params[0].type = ACPI_TYPE_BUFFER;
318 in_params[0].buffer.length = sizeof(struct ata_acpi_gtm);
319 in_params[0].buffer.pointer = (u8 *)&stm_buf;
320 /* Buffers for id may need byteswapping ? */
321 in_params[1].type = ACPI_TYPE_BUFFER;
322 in_params[1].buffer.length = 512;
323 in_params[1].buffer.pointer = (u8 *)ap->link.device[0].id;
324 in_params[2].type = ACPI_TYPE_BUFFER;
325 in_params[2].buffer.length = 512;
326 in_params[2].buffer.pointer = (u8 *)ap->link.device[1].id;
329 input.pointer = in_params;
331 status = acpi_evaluate_object(ap->acpi_handle, "_STM", &input, NULL);
333 if (status == AE_NOT_FOUND)
335 if (ACPI_FAILURE(status)) {
336 ata_port_printk(ap, KERN_ERR,
337 "ACPI set timing mode failed (status=0x%x)\n", status);
343 EXPORT_SYMBOL_GPL(ata_acpi_stm);
346 * ata_dev_get_GTF - get the drive bootup default taskfile settings
347 * @dev: target ATA device
348 * @gtf: output parameter for buffer containing _GTF taskfile arrays
350 * This applies to both PATA and SATA drives.
352 * The _GTF method has no input parameters.
353 * It returns a variable number of register set values (registers
354 * hex 1F1..1F7, taskfiles).
355 * The <variable number> is not known in advance, so have ACPI-CA
356 * allocate the buffer as needed and return it, then free it later.
362 * Number of taskfiles on success, 0 if _GTF doesn't exist. -EINVAL
363 * if _GTF is invalid.
365 static int ata_dev_get_GTF(struct ata_device *dev, struct ata_acpi_gtf **gtf)
367 struct ata_port *ap = dev->link->ap;
369 struct acpi_buffer output;
370 union acpi_object *out_obj;
373 /* if _GTF is cached, use the cached value */
374 if (dev->gtf_cache) {
375 out_obj = dev->gtf_cache;
379 /* set up output buffer */
380 output.length = ACPI_ALLOCATE_BUFFER;
381 output.pointer = NULL; /* ACPI-CA sets this; save/free it later */
383 if (ata_msg_probe(ap))
384 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER: port#: %d\n",
385 __FUNCTION__, ap->port_no);
387 /* _GTF has no input parameters */
388 status = acpi_evaluate_object(dev->acpi_handle, "_GTF", NULL, &output);
389 out_obj = dev->gtf_cache = output.pointer;
391 if (ACPI_FAILURE(status)) {
392 if (status != AE_NOT_FOUND) {
393 ata_dev_printk(dev, KERN_WARNING,
394 "_GTF evaluation failed (AE 0x%x)\n",
401 if (!output.length || !output.pointer) {
402 if (ata_msg_probe(ap))
403 ata_dev_printk(dev, KERN_DEBUG, "%s: Run _GTF: "
404 "length or ptr is NULL (0x%llx, 0x%p)\n",
406 (unsigned long long)output.length,
412 if (out_obj->type != ACPI_TYPE_BUFFER) {
413 ata_dev_printk(dev, KERN_WARNING,
414 "_GTF unexpected object type 0x%x\n",
420 if (out_obj->buffer.length % REGS_PER_GTF) {
421 ata_dev_printk(dev, KERN_WARNING,
422 "unexpected _GTF length (%d)\n",
423 out_obj->buffer.length);
429 rc = out_obj->buffer.length / REGS_PER_GTF;
431 *gtf = (void *)out_obj->buffer.pointer;
432 if (ata_msg_probe(ap))
433 ata_dev_printk(dev, KERN_DEBUG,
434 "%s: returning gtf=%p, gtf_count=%d\n",
435 __FUNCTION__, *gtf, rc);
440 ata_acpi_clear_gtf(dev);
445 * ata_acpi_gtm_xfermode - determine xfermode from GTM parameter
446 * @dev: target device
447 * @gtm: GTM parameter to use
449 * Determine xfermask for @dev from @gtm.
455 * Determined xfermask.
457 unsigned long ata_acpi_gtm_xfermask(struct ata_device *dev,
458 const struct ata_acpi_gtm *gtm)
460 unsigned long xfer_mask = 0;
465 /* we always use the 0 slot for crap hardware */
467 if (!(gtm->flags & 0x10))
471 mode = ata_timing_cycle2mode(ATA_SHIFT_PIO, gtm->drive[unit].pio);
472 xfer_mask |= ata_xfer_mode2mask(mode);
474 /* See if we have MWDMA or UDMA data. We don't bother with
475 * MWDMA if UDMA is available as this means the BIOS set UDMA
476 * and our error changedown if it works is UDMA to PIO anyway.
478 if (!(gtm->flags & (1 << (2 * unit))))
479 type = ATA_SHIFT_MWDMA;
481 type = ATA_SHIFT_UDMA;
483 mode = ata_timing_cycle2mode(type, gtm->drive[unit].dma);
484 xfer_mask |= ata_xfer_mode2mask(mode);
488 EXPORT_SYMBOL_GPL(ata_acpi_gtm_xfermask);
491 * ata_acpi_cbl_80wire - Check for 80 wire cable
493 * @gtm: GTM data to use
495 * Return 1 if the @gtm indicates the BIOS selected an 80wire mode.
497 int ata_acpi_cbl_80wire(struct ata_port *ap, const struct ata_acpi_gtm *gtm)
499 struct ata_device *dev;
501 ata_link_for_each_dev(dev, &ap->link) {
502 unsigned long xfer_mask, udma_mask;
504 if (!ata_dev_enabled(dev))
507 xfer_mask = ata_acpi_gtm_xfermask(dev, gtm);
508 ata_unpack_xfermask(xfer_mask, NULL, NULL, &udma_mask);
510 if (udma_mask & ~ATA_UDMA_MASK_40C)
516 EXPORT_SYMBOL_GPL(ata_acpi_cbl_80wire);
518 static void ata_acpi_gtf_to_tf(struct ata_device *dev,
519 const struct ata_acpi_gtf *gtf,
520 struct ata_taskfile *tf)
522 ata_tf_init(dev, tf);
524 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
525 tf->protocol = ATA_PROT_NODATA;
526 tf->feature = gtf->tf[0]; /* 0x1f1 */
527 tf->nsect = gtf->tf[1]; /* 0x1f2 */
528 tf->lbal = gtf->tf[2]; /* 0x1f3 */
529 tf->lbam = gtf->tf[3]; /* 0x1f4 */
530 tf->lbah = gtf->tf[4]; /* 0x1f5 */
531 tf->device = gtf->tf[5]; /* 0x1f6 */
532 tf->command = gtf->tf[6]; /* 0x1f7 */
535 static int ata_acpi_filter_tf(const struct ata_taskfile *tf,
536 const struct ata_taskfile *ptf)
538 if (ata_acpi_gtf_filter & ATA_ACPI_FILTER_SETXFER) {
539 /* libata doesn't use ACPI to configure transfer mode.
540 * It will only confuse device configuration. Skip.
542 if (tf->command == ATA_CMD_SET_FEATURES &&
543 tf->feature == SETFEATURES_XFER)
547 if (ata_acpi_gtf_filter & ATA_ACPI_FILTER_LOCK) {
548 /* BIOS writers, sorry but we don't wanna lock
549 * features unless the user explicitly said so.
552 /* DEVICE CONFIGURATION FREEZE LOCK */
553 if (tf->command == ATA_CMD_CONF_OVERLAY &&
554 tf->feature == ATA_DCO_FREEZE_LOCK)
557 /* SECURITY FREEZE LOCK */
558 if (tf->command == ATA_CMD_SEC_FREEZE_LOCK)
561 /* SET MAX LOCK and SET MAX FREEZE LOCK */
562 if ((!ptf || ptf->command != ATA_CMD_READ_NATIVE_MAX) &&
563 tf->command == ATA_CMD_SET_MAX &&
564 (tf->feature == ATA_SET_MAX_LOCK ||
565 tf->feature == ATA_SET_MAX_FREEZE_LOCK))
573 * ata_acpi_run_tf - send taskfile registers to host controller
574 * @dev: target ATA device
575 * @gtf: raw ATA taskfile register set (0x1f1 - 0x1f7)
577 * Outputs ATA taskfile to standard ATA host controller using MMIO
578 * or PIO as indicated by the ATA_FLAG_MMIO flag.
579 * Writes the control, feature, nsect, lbal, lbam, and lbah registers.
580 * Optionally (ATA_TFLAG_LBA48) writes hob_feature, hob_nsect,
581 * hob_lbal, hob_lbam, and hob_lbah.
583 * This function waits for idle (!BUSY and !DRQ) after writing
584 * registers. If the control register has a new value, this
585 * function also waits for idle after writing control and before
586 * writing the remaining registers.
592 * 1 if command is executed successfully. 0 if ignored, rejected or
593 * filtered out, -errno on other errors.
595 static int ata_acpi_run_tf(struct ata_device *dev,
596 const struct ata_acpi_gtf *gtf,
597 const struct ata_acpi_gtf *prev_gtf)
599 struct ata_taskfile *pptf = NULL;
600 struct ata_taskfile tf, ptf, rtf;
601 unsigned int err_mask;
606 if ((gtf->tf[0] == 0) && (gtf->tf[1] == 0) && (gtf->tf[2] == 0)
607 && (gtf->tf[3] == 0) && (gtf->tf[4] == 0) && (gtf->tf[5] == 0)
608 && (gtf->tf[6] == 0))
611 ata_acpi_gtf_to_tf(dev, gtf, &tf);
613 ata_acpi_gtf_to_tf(dev, prev_gtf, &ptf);
617 if (!ata_acpi_filter_tf(&tf, pptf)) {
619 err_mask = ata_exec_internal(dev, &rtf, NULL,
620 DMA_NONE, NULL, 0, 0);
625 snprintf(msg, sizeof(msg), "succeeded");
631 snprintf(msg, sizeof(msg),
632 "rejected by device (Stat=0x%02x Err=0x%02x)",
633 rtf.command, rtf.feature);
639 snprintf(msg, sizeof(msg),
640 "failed (Emask=0x%x Stat=0x%02x Err=0x%02x)",
641 err_mask, rtf.command, rtf.feature);
647 snprintf(msg, sizeof(msg), "filtered out");
651 ata_dev_printk(dev, level,
652 "ACPI cmd %02x/%02x:%02x:%02x:%02x:%02x:%02x %s\n",
653 tf.command, tf.feature, tf.nsect, tf.lbal,
654 tf.lbam, tf.lbah, tf.device, msg);
660 * ata_acpi_exec_tfs - get then write drive taskfile settings
661 * @dev: target ATA device
662 * @nr_executed: out paramter for the number of executed commands
664 * Evaluate _GTF and excute returned taskfiles.
670 * Number of executed taskfiles on success, 0 if _GTF doesn't exist.
671 * -errno on other errors.
673 static int ata_acpi_exec_tfs(struct ata_device *dev, int *nr_executed)
675 struct ata_acpi_gtf *gtf = NULL, *pgtf = NULL;
676 int gtf_count, i, rc;
679 rc = ata_dev_get_GTF(dev, >f);
685 for (i = 0; i < gtf_count; i++, gtf++) {
686 rc = ata_acpi_run_tf(dev, gtf, pgtf);
695 ata_acpi_clear_gtf(dev);
703 * ata_acpi_push_id - send Identify data to drive
704 * @dev: target ATA device
706 * _SDD ACPI object: for SATA mode only
707 * Must be after Identify (Packet) Device -- uses its data
708 * ATM this function never returns a failure. It is an optional
709 * method and if it fails for whatever reason, we should still
716 * 0 on success, -errno on failure.
718 static int ata_acpi_push_id(struct ata_device *dev)
720 struct ata_port *ap = dev->link->ap;
723 struct acpi_object_list input;
724 union acpi_object in_params[1];
726 if (ata_msg_probe(ap))
727 ata_dev_printk(dev, KERN_DEBUG, "%s: ix = %d, port#: %d\n",
728 __FUNCTION__, dev->devno, ap->port_no);
730 /* Give the drive Identify data to the drive via the _SDD method */
731 /* _SDD: set up input parameters */
733 input.pointer = in_params;
734 in_params[0].type = ACPI_TYPE_BUFFER;
735 in_params[0].buffer.length = sizeof(dev->id[0]) * ATA_ID_WORDS;
736 in_params[0].buffer.pointer = (u8 *)dev->id;
737 /* Output buffer: _SDD has no output */
739 /* It's OK for _SDD to be missing too. */
740 swap_buf_le16(dev->id, ATA_ID_WORDS);
741 status = acpi_evaluate_object(dev->acpi_handle, "_SDD", &input, NULL);
742 swap_buf_le16(dev->id, ATA_ID_WORDS);
744 err = ACPI_FAILURE(status) ? -EIO : 0;
746 ata_dev_printk(dev, KERN_WARNING,
747 "ACPI _SDD failed (AE 0x%x)\n", status);
753 * ata_acpi_on_suspend - ATA ACPI hook called on suspend
754 * @ap: target ATA port
756 * This function is called when @ap is about to be suspended. All
757 * devices are already put to sleep but the port_suspend() callback
758 * hasn't been executed yet. Error return from this function aborts
765 * 0 on success, -errno on failure.
767 int ata_acpi_on_suspend(struct ata_port *ap)
774 * ata_acpi_on_resume - ATA ACPI hook called on resume
775 * @ap: target ATA port
777 * This function is called when @ap is resumed - right after port
778 * itself is resumed but before any EH action is taken.
783 void ata_acpi_on_resume(struct ata_port *ap)
785 const struct ata_acpi_gtm *gtm = ata_acpi_init_gtm(ap);
786 struct ata_device *dev;
788 if (ap->acpi_handle && gtm) {
791 /* restore timing parameters */
792 ata_acpi_stm(ap, gtm);
794 /* _GTF should immediately follow _STM so that it can
795 * use values set by _STM. Cache _GTF result and
798 ata_link_for_each_dev(dev, &ap->link) {
799 ata_acpi_clear_gtf(dev);
800 if (ata_dev_get_GTF(dev, NULL) >= 0)
801 dev->flags |= ATA_DFLAG_ACPI_PENDING;
804 /* SATA _GTF needs to be evaulated after _SDD and
805 * there's no reason to evaluate IDE _GTF early
806 * without _STM. Clear cache and schedule _GTF.
808 ata_link_for_each_dev(dev, &ap->link) {
809 ata_acpi_clear_gtf(dev);
810 dev->flags |= ATA_DFLAG_ACPI_PENDING;
816 * ata_acpi_set_state - set the port power state
817 * @ap: target ATA port
818 * @state: state, on/off
820 * This function executes the _PS0/_PS3 ACPI method to set the power state.
821 * ACPI spec requires _PS0 when IDE power on and _PS3 when power off
823 void ata_acpi_set_state(struct ata_port *ap, pm_message_t state)
825 struct ata_device *dev;
827 if (!ap->acpi_handle || (ap->flags & ATA_FLAG_ACPI_SATA))
830 /* channel first and then drives for power on and vica versa
832 if (state.event == PM_EVENT_ON)
833 acpi_bus_set_power(ap->acpi_handle, ACPI_STATE_D0);
835 ata_link_for_each_dev(dev, &ap->link) {
836 if (dev->acpi_handle && ata_dev_enabled(dev))
837 acpi_bus_set_power(dev->acpi_handle,
838 state.event == PM_EVENT_ON ?
839 ACPI_STATE_D0 : ACPI_STATE_D3);
841 if (state.event != PM_EVENT_ON)
842 acpi_bus_set_power(ap->acpi_handle, ACPI_STATE_D3);
846 * ata_acpi_on_devcfg - ATA ACPI hook called on device donfiguration
847 * @dev: target ATA device
849 * This function is called when @dev is about to be configured.
850 * IDENTIFY data might have been modified after this hook is run.
856 * Positive number if IDENTIFY data needs to be refreshed, 0 if not,
859 int ata_acpi_on_devcfg(struct ata_device *dev)
861 struct ata_port *ap = dev->link->ap;
862 struct ata_eh_context *ehc = &ap->link.eh_context;
863 int acpi_sata = ap->flags & ATA_FLAG_ACPI_SATA;
867 if (!dev->acpi_handle)
870 /* do we need to do _GTF? */
871 if (!(dev->flags & ATA_DFLAG_ACPI_PENDING) &&
872 !(acpi_sata && (ehc->i.flags & ATA_EHI_DID_HARDRESET)))
875 /* do _SDD if SATA */
877 rc = ata_acpi_push_id(dev);
883 rc = ata_acpi_exec_tfs(dev, &nr_executed);
887 dev->flags &= ~ATA_DFLAG_ACPI_PENDING;
889 /* refresh IDENTIFY page if any _GTF command has been executed */
891 rc = ata_dev_reread_id(dev, 0);
893 ata_dev_printk(dev, KERN_ERR, "failed to IDENTIFY "
894 "after ACPI commands\n");
902 /* ignore evaluation failure if we can continue safely */
903 if (rc == -EINVAL && !nr_executed && !(ap->pflags & ATA_PFLAG_FROZEN))
906 /* fail and let EH retry once more for unknown IO errors */
907 if (!(dev->flags & ATA_DFLAG_ACPI_FAILED)) {
908 dev->flags |= ATA_DFLAG_ACPI_FAILED;
912 ata_dev_printk(dev, KERN_WARNING,
913 "ACPI: failed the second time, disabled\n");
914 dev->acpi_handle = NULL;
916 /* We can safely continue if no _GTF command has been executed
917 * and port is not frozen.
919 if (!nr_executed && !(ap->pflags & ATA_PFLAG_FROZEN))
926 * ata_acpi_on_disable - ATA ACPI hook called when a device is disabled
927 * @dev: target ATA device
929 * This function is called when @dev is about to be disabled.
934 void ata_acpi_on_disable(struct ata_device *dev)
936 ata_acpi_clear_gtf(dev);