2 * Copyright (c) 2009 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
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8 * modification, are permitted provided that the following conditions
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31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 static void ahci_pm_dummy_done(struct ata_xfer *xa);
40 ahci_pm_port_init(struct ahci_port *ap, struct ata_port *at)
42 at->at_probe = ATA_PROBE_NEED_HARD_RESET;
47 * AHCI port multiplier probe. This routine is run by the hardreset code
48 * if it gets past the device detect, whether or not BSY is found to be
51 * We MUST use CLO to properly probe whether the port multiplier exists
54 * Return 0 on success, non-zero on failure.
57 ahci_pm_port_probe(struct ahci_port *ap, int orig_error)
59 struct ahci_cmd_hdr *cmd_slot;
61 struct ahci_ccb *ccb = NULL;
71 * This code is only called from hardreset, which does not
72 * high level command processing. The port should be stopped.
74 * Set PMA mode while the port is stopped.
76 * NOTE: On retry the port might be running, stopped, or failed.
78 ahci_port_stop(ap, 0);
79 ap->ap_state = AP_S_NORMAL;
80 cmd = ahci_pread(ap, AHCI_PREG_CMD) & ~AHCI_PREG_CMD_ICC;
81 if ((cmd & AHCI_PREG_CMD_PMA) == 0) {
82 cmd |= AHCI_PREG_CMD_PMA;
83 ahci_pwrite(ap, AHCI_PREG_CMD, cmd);
87 * Flush any errors and request CLO unconditionally, then start
92 if (ahci_port_start(ap)) {
93 kprintf("%s: PMPROBE failed to start port, cannot softreset\n",
100 * Check whether CLO worked
102 if (ahci_pwait_clr(ap, AHCI_PREG_TFD,
103 AHCI_PREG_TFD_STS_BSY | AHCI_PREG_TFD_STS_DRQ)) {
104 kprintf("%s: PMPROBE CLO %s, need port reset\n",
106 (ahci_read(ap->ap_sc, AHCI_REG_CAP) & AHCI_REG_CAP_SCLO)
107 ? "failed" : "unsupported");
113 * Use the error CCB for all commands
115 * NOTE! This CCB is used for both the first and second commands.
116 * The second command must use CCB slot 1 to properly load
119 ccb = ahci_get_err_ccb(ap);
120 ccb->ccb_xa.flags = ATA_F_POLL;
121 ccb->ccb_xa.complete = ahci_pm_dummy_done;
122 ccb->ccb_xa.at = &ap->ap_ata[15];
123 cmd_slot = ccb->ccb_cmd_hdr;
124 KKASSERT(ccb->ccb_slot == 1);
127 * Prep the first H2D command with SRST feature & clear busy/reset
130 fis = ccb->ccb_cmd_table->cfis;
131 bzero(fis, sizeof(ccb->ccb_cmd_table->cfis));
132 fis[0] = ATA_FIS_TYPE_H2D;
133 fis[1] = 0x0F; /* Target 15 */
134 fis[15] = ATA_FIS_CONTROL_SRST | ATA_FIS_CONTROL_4BIT;
137 cmd_slot->flags = htole16(5); /* FIS length: 5 DWORDS */
138 cmd_slot->flags |= htole16(AHCI_CMD_LIST_FLAG_C); /* Clear busy on OK */
139 cmd_slot->flags |= htole16(AHCI_CMD_LIST_FLAG_R); /* Reset */
140 cmd_slot->flags |= htole16(AHCI_CMD_LIST_FLAG_PMP); /* port 0xF */
142 ccb->ccb_xa.state = ATA_S_PENDING;
144 if (ahci_poll(ccb, 1000, ahci_quick_timeout) != ATA_S_COMPLETE) {
145 kprintf("%s: PMPROBE First FIS failed\n", PORTNAME(ap));
147 ahci_put_err_ccb(ccb);
153 if (ahci_pwait_clr(ap, AHCI_PREG_TFD,
154 AHCI_PREG_TFD_STS_BSY | AHCI_PREG_TFD_STS_DRQ)) {
155 kprintf("%s: PMPROBE Busy after first FIS\n", PORTNAME(ap));
159 * The device may have muffed up the PHY when it reset.
163 ahci_pwrite(ap, AHCI_PREG_SERR, -1);
164 /* ahci_pm_phy_status(ap, 15, &cmd); */
167 * Prep second D2H command to read status and complete reset sequence
168 * AHCI 10.4.1 and "Serial ATA Revision 2.6". I can't find the ATA
169 * Rev 2.6 and it is unclear how the second FIS should be set up
170 * from the AHCI document.
172 * Give the device 3ms before sending the second FIS.
174 * It is unclear which other fields in the FIS are used. Just zero
177 ccb->ccb_xa.flags = ATA_F_POLL;
179 bzero(fis, sizeof(ccb->ccb_cmd_table->cfis));
180 fis[0] = ATA_FIS_TYPE_H2D;
182 fis[15] = ATA_FIS_CONTROL_4BIT;
185 cmd_slot->flags = htole16(5); /* FIS length: 5 DWORDS */
186 cmd_slot->flags |= htole16(AHCI_CMD_LIST_FLAG_PMP); /* port 0xF */
188 ccb->ccb_xa.state = ATA_S_PENDING;
190 if (ahci_poll(ccb, 5000, ahci_quick_timeout) != ATA_S_COMPLETE) {
191 kprintf("%s: PMPROBE Second FIS failed\n", PORTNAME(ap));
193 ahci_put_err_ccb(ccb);
201 * What? We succeeded? Yup, but for some reason the signature
202 * is still latched from the original detect (that saw target 0
203 * behind the PM), and I don't know how to clear the condition
204 * other then by retrying the whole reset sequence.
208 ahci_put_err_ccb(ccb);
213 * Get the signature. The caller sets the ap fields.
215 if (ahci_port_signature_detect(ap, NULL) == ATA_PORT_T_PM) {
216 ap->ap_ata[15].at_probe = ATA_PROBE_GOOD;
223 * Fall through / clean up the CCB and perform error processing.
227 ahci_put_err_ccb(ccb);
229 if (error == 0 && ahci_pm_identify(ap)) {
230 kprintf("%s: PM - cannot identify port multiplier\n",
236 * If we probed the PM reset the state for the targets behind
237 * it so they get probed by the state machine.
240 for (i = 0; i < AHCI_MAX_PMPORTS; ++i) {
242 at->at_probe = ATA_PROBE_NEED_INIT;
243 at->at_features |= ATA_PORT_F_RESCAN;
245 ap->ap_type = ATA_PORT_T_PM;
250 * If we failed turn off PMA, otherwise identify the port multiplier.
251 * CAM will iterate the devices.
253 ahci_port_stop(ap, 0);
255 cmd = ahci_pread(ap, AHCI_PREG_CMD) & ~AHCI_PREG_CMD_ICC;
256 cmd &= ~AHCI_PREG_CMD_PMA;
257 ahci_pwrite(ap, AHCI_PREG_CMD, cmd);
259 if (orig_error == 0) {
260 if (ahci_pwait_clr(ap, AHCI_PREG_TFD,
261 AHCI_PREG_TFD_STS_BSY | AHCI_PREG_TFD_STS_DRQ)) {
262 kprintf("%s: PM probe: port will not come ready\n",
271 * Identify the port multiplier
274 ahci_pm_identify(struct ahci_port *ap)
283 ap->ap_probe = ATA_PROBE_FAILED;
284 if (ahci_pm_read(ap, 15, 0, &chipid))
286 if (ahci_pm_read(ap, 15, 1, &rev))
288 if (ahci_pm_read(ap, 15, 2, &nports))
290 nports &= 0x0000000F; /* only the low 4 bits */
291 ap->ap_probe = ATA_PROBE_GOOD;
294 * Ignore fake port on PMs which have it. We can probe it but the
295 * softreset will probably fail.
305 if (has_dummy_port) {
310 kprintf("%s: Port multiplier: chip=%08x rev=0x%b nports=%d\n",
313 rev, SATA_PFMT_PM_REV,
315 if (has_dummy_port) {
316 kprintf("%s: Port multiplier: Ignoring dummy port #%d\n",
317 PORTNAME(ap), nports);
319 ap->ap_pmcount = nports;
321 if (ahci_pm_read(ap, 15, SATA_PMREG_FEA, &data1)) {
322 kprintf("%s: Port multiplier: Warning, "
323 "cannot read feature register\n", PORTNAME(ap));
325 kprintf("%s: Port multiplier features: 0x%b\n",
330 if (ahci_pm_read(ap, 15, SATA_PMREG_FEAEN, &data2) == 0) {
331 kprintf("%s: Port multiplier defaults: 0x%b\n",
338 * Turn on async notification if we support and the PM supports it.
339 * This allows the PM to forward async notification events to us and
340 * it will also generate an event for target 15 for hot-plug events
341 * (or is supposed to anyway).
343 if ((ap->ap_sc->sc_cap & AHCI_REG_CAP_SSNTF) &&
344 (data1 & SATA_PMFEA_ASYNCNOTIFY)) {
345 u_int32_t serr_bits = AHCI_PREG_SERR_DIAG_N |
346 AHCI_PREG_SERR_DIAG_X;
347 data2 |= SATA_PMFEA_ASYNCNOTIFY;
348 if (ahci_pm_write(ap, 15, SATA_PMREG_FEAEN, data2)) {
349 kprintf("%s: Port multiplier: AsyncNotify cannot be "
350 "enabled\n", PORTNAME(ap));
351 } else if (ahci_pm_write(ap, 15, SATA_PMREG_EEENA, serr_bits)) {
352 kprintf("%s: Port mulltiplier: AsyncNotify unable "
353 "to enable error info bits\n", PORTNAME(ap));
355 kprintf("%s: Port multiplier: AsyncNotify enabled\n",
362 kprintf("%s: Port multiplier cannot be identified\n", PORTNAME(ap));
367 * Do a COMRESET sequence on the target behind a port multiplier.
369 * If hard is 2 we also cycle the phy on the target.
371 * This must be done prior to any softreset or probe attempts on
372 * targets behind the port multiplier.
374 * Returns 0 on success or an error.
377 ahci_pm_hardreset(struct ahci_port *ap, int target, int hard)
384 at = &ap->ap_ata[target];
387 * Turn off power management and kill the phy on the target
388 * if requested. Hold state for 10ms.
390 data = AHCI_PREG_SCTL_IPM_DISABLED;
392 data |= AHCI_PREG_SCTL_DET_DISABLE;
393 if (ahci_pm_write(ap, target, SATA_PMREG_SERR, -1))
395 if (ahci_pm_write(ap, target, SATA_PMREG_SCTL, data))
400 * Start transmitting COMRESET. COMRESET must be sent for at
403 at->at_probe = ATA_PROBE_FAILED;
404 at->at_type = ATA_PORT_T_NONE;
405 data = AHCI_PREG_SCTL_IPM_DISABLED | AHCI_PREG_SCTL_DET_INIT;
406 if (AhciForceGen1 & (1 << ap->ap_num)) {
407 kprintf("%s.%d: Force 1.5GBits\n", PORTNAME(ap), target);
408 data |= AHCI_PREG_SCTL_SPD_GEN1;
410 data |= AHCI_PREG_SCTL_SPD_ANY;
412 if (ahci_pm_write(ap, target, SATA_PMREG_SCTL, data))
416 * It takes about 100ms for the DET logic to settle down,
417 * from trial and error testing. If this is too short
418 * the softreset code will fail.
422 if (ahci_pm_phy_status(ap, target, &data)) {
423 kprintf("%s: (A)Cannot clear phy status\n",
428 * Flush any status, then clear DET to initiate negotiation.
430 ahci_pm_write(ap, target, SATA_PMREG_SERR, -1);
431 data = AHCI_PREG_SCTL_IPM_DISABLED | AHCI_PREG_SCTL_DET_NONE;
432 if (ahci_pm_write(ap, target, SATA_PMREG_SCTL, data))
436 * Try to determine if there is a device on the port.
438 * Give the device 3/10 second to at least be detected.
439 * If we fail clear any pending status since we may have
440 * cycled the phy and probably caused another PRCS interrupt.
442 for (loop = 3; loop; --loop) {
443 if (ahci_pm_read(ap, target, SATA_PMREG_SSTS, &data))
445 if (data & AHCI_PREG_SSTS_DET)
450 kprintf("%s.%d: Port appears to be unplugged\n",
451 PORTNAME(ap), target);
457 * There is something on the port. Give the device 3 seconds
458 * to fully negotiate.
460 for (loop = 30; loop; --loop) {
461 if (ahci_pm_read(ap, target, SATA_PMREG_SSTS, &data))
463 if ((data & AHCI_PREG_SSTS_DET) == AHCI_PREG_SSTS_DET_DEV)
469 * Device not detected
472 kprintf("%s: Device may be powered down\n",
481 kprintf("%s.%d: Device detected data=%08x\n",
482 PORTNAME(ap), target, data);
484 * Clear SERR on the target so we get a new NOTIFY event if a hot-plug
485 * or hot-unplug occurs.
491 at->at_probe = error ? ATA_PROBE_FAILED : ATA_PROBE_NEED_SOFT_RESET;
496 * AHCI soft reset through port multiplier.
498 * This function keeps port communications intact and attempts to generate
499 * a reset to the connected device using device commands. Unlike
500 * hard-port operations we can't do fancy stop/starts or stuff like
501 * that without messing up other commands that might be running or
505 ahci_pm_softreset(struct ahci_port *ap, int target)
508 struct ahci_ccb *ccb;
509 struct ahci_cmd_hdr *cmd_slot;
517 at = &ap->ap_ata[target];
519 DPRINTF(AHCI_D_VERBOSE, "%s: soft reset\n", PORTNAME(ap));
525 * Try to clear the phy so we get a good signature, otherwise
526 * the PM may not latch a new signature.
528 * NOTE: This cannot be safely done between the first and second
529 * softreset FISs. It's now or never.
532 if (ahci_pm_phy_status(ap, target, &data)) {
533 kprintf("%s: (B)Cannot clear phy status\n",
536 ahci_pm_write(ap, target, SATA_PMREG_SERR, -1);
540 * Prep first D2H command with SRST feature & clear busy/reset flags
542 * It is unclear which other fields in the FIS are used. Just zero
545 * When soft-resetting a port behind a multiplier at will be
546 * non-NULL, assigning it to the ccb prevents the port interrupt
547 * from hard-resetting the port if a problem crops up.
549 ccb = ahci_get_err_ccb(ap);
550 ccb->ccb_xa.flags = ATA_F_POLL | ATA_F_EXCLUSIVE | ATA_F_AUTOSENSE;
551 ccb->ccb_xa.complete = ahci_pm_dummy_done;
554 fis = ccb->ccb_cmd_table->cfis;
555 bzero(fis, sizeof(ccb->ccb_cmd_table->cfis));
556 fis[0] = ATA_FIS_TYPE_H2D;
557 fis[1] = at->at_target;
558 fis[15] = ATA_FIS_CONTROL_SRST|ATA_FIS_CONTROL_4BIT;
560 cmd_slot = ccb->ccb_cmd_hdr;
562 cmd_slot->flags = htole16(5); /* FIS length: 5 DWORDS */
563 cmd_slot->flags |= htole16(AHCI_CMD_LIST_FLAG_C); /* Clear busy on OK */
564 cmd_slot->flags |= htole16(AHCI_CMD_LIST_FLAG_R); /* Reset */
565 cmd_slot->flags |= htole16(at->at_target <<
566 AHCI_CMD_LIST_FLAG_PMP_SHIFT);
568 ccb->ccb_xa.state = ATA_S_PENDING;
571 * XXX hack to ignore IFS errors which can occur during the target
574 * If an IFS error occurs the target is probably powering up,
575 * so we try for a longer period of time.
577 ap->ap_flags |= AP_F_IGNORE_IFS;
578 ap->ap_flags &= ~(AP_F_IFS_IGNORED | AP_F_IFS_OCCURED);
580 if (ahci_poll(ccb, 1000, ahci_ata_cmd_timeout) != ATA_S_COMPLETE) {
581 kprintf("%s: (PM) First FIS failed\n", ATANAME(ap, at));
582 if (ap->ap_flags & AP_F_IFS_OCCURED) {
583 if (tried_longer == 0)
587 ahci_put_err_ccb(ccb);
594 * WARNING! SENSITIVE TIME PERIOD! WARNING!
596 * The first and second FISes are supposed to be back-to-back,
597 * I think the idea is to get the second sent and then after
598 * the device resets it will send a signature. Do not delay
599 * here and most definitely do not issue any commands to other
604 * Prep second D2H command to read status and complete reset sequence
605 * AHCI 10.4.1 and "Serial ATA Revision 2.6". I can't find the ATA
606 * Rev 2.6 and it is unclear how the second FIS should be set up
607 * from the AHCI document.
609 * Give the device 3ms before sending the second FIS.
611 * It is unclear which other fields in the FIS are used. Just zero
614 bzero(fis, sizeof(ccb->ccb_cmd_table->cfis));
615 fis[0] = ATA_FIS_TYPE_H2D;
616 fis[1] = at->at_target;
617 fis[15] = ATA_FIS_CONTROL_4BIT;
620 cmd_slot->flags = htole16(5); /* FIS length: 5 DWORDS */
621 cmd_slot->flags |= htole16(at->at_target <<
622 AHCI_CMD_LIST_FLAG_PMP_SHIFT);
624 ccb->ccb_xa.state = ATA_S_PENDING;
625 ccb->ccb_xa.flags = ATA_F_POLL | ATA_F_EXCLUSIVE | ATA_F_AUTOSENSE;
627 if (ahci_poll(ccb, 1000, ahci_ata_cmd_timeout) != ATA_S_COMPLETE) {
628 kprintf("%s: (PM) Second FIS failed\n", ATANAME(ap, at));
629 ahci_put_err_ccb(ccb);
637 ahci_put_err_ccb(ccb);
639 ahci_pm_write(ap, target, SATA_PMREG_SERR, -1);
640 if (ahci_pm_phy_status(ap, target, &data)) {
641 kprintf("%s: (C)Cannot clear phy status\n",
644 ahci_pm_write(ap, target, SATA_PMREG_SERR, -1);
647 * Do it again, even if we think we got a good result
655 * If the softreset is trying to clear a BSY condition after a
656 * normal portreset we assign the port type.
658 * If the softreset is being run first as part of the ccb error
659 * processing code then report if the device signature changed
662 if (at->at_type == ATA_PORT_T_NONE) {
663 at->at_type = ahci_port_signature_detect(ap, at);
665 if (ahci_port_signature_detect(ap, at) != at->at_type) {
666 kprintf("%s: device signature unexpectedly "
667 "changed\n", ATANAME(ap, at));
668 error = EBUSY; /* XXX */
674 * Who knows what kind of mess occured. We have exclusive access
675 * to the port so try to clean up potential problems.
680 * Clear error status so we can detect removal.
682 if (ahci_pm_write(ap, target, SATA_PMREG_SERR, -1)) {
683 kprintf("%s: ahci_pm_softreset unable to clear SERR\n",
685 ap->ap_flags &= ~AP_F_IGNORE_IFS;
687 /* ahci_pwrite(ap, AHCI_PREG_SERR, -1);*/
689 at->at_probe = error ? ATA_PROBE_FAILED : ATA_PROBE_NEED_IDENT;
695 * Return the phy status for a target behind a port multiplier and
696 * reset SATA_PMREG_SERR.
698 * Returned bits follow AHCI_PREG_SSTS bits. The AHCI_PREG_SSTS_SPD
699 * bits can be used to determine the link speed and will be 0 if there
702 * 0 is returned if any communications error occurs.
705 ahci_pm_phy_status(struct ahci_port *ap, int target, u_int32_t *datap)
709 error = ahci_pm_read(ap, target, SATA_PMREG_SSTS, datap);
711 error = ahci_pm_write(ap, target, SATA_PMREG_SERR, -1);
718 ahci_pm_set_feature(struct ahci_port *ap, int feature, int enable)
723 xa = ahci_ata_get_xfer(ap, &ap->ap_ata[15]);
725 xa->fis->type = ATA_FIS_TYPE_H2D;
726 xa->fis->flags = ATA_H2D_FLAGS_CMD | 15;
727 xa->fis->command = enable ? ATA_C_SATA_FEATURE_ENA :
728 ATA_C_SATA_FEATURE_DIS;
729 xa->fis->sector_count = feature;
730 xa->fis->control = ATA_FIS_CONTROL_4BIT;
732 xa->complete = ahci_pm_dummy_done;
734 xa->flags = ATA_F_POLL;
737 if (ahci_ata_cmd(xa) == ATA_S_COMPLETE)
741 ahci_ata_put_xfer(xa);
746 * Check that a target is still good.
749 ahci_pm_check_good(struct ahci_port *ap, int target)
755 * It looks like we might have to read the EINFO register
756 * to allow the PM to generate a new event.
758 if (ahci_pm_read(ap, 15, SATA_PMREG_EINFO, &data)) {
759 kprintf("%s: Port multiplier EINFO could not be read\n",
763 if (ahci_pm_write(ap, target, SATA_PMREG_SERR, -1)) {
764 kprintf("%s: Port multiplier: SERR could not be cleared\n",
768 if (target == CAM_TARGET_WILDCARD || target >= ap->ap_pmcount)
770 at = &ap->ap_ata[target];
773 * If the device needs an init or hard reset also make sure the
776 if (at->at_probe <= ATA_PROBE_NEED_HARD_RESET) {
777 /*kprintf("%s DOHARD\n", ATANAME(ap, at));*/
778 ahci_pm_hardreset(ap, target, 1);
782 * Read the detect status
784 if (ahci_pm_read(ap, target, SATA_PMREG_SSTS, &data)) {
785 kprintf("%s: Unable to access PM SSTS register target %d\n",
786 PORTNAME(ap), target);
789 if ((data & AHCI_PREG_SSTS_DET) != AHCI_PREG_SSTS_DET_DEV) {
790 /*kprintf("%s: DETECT %08x\n", ATANAME(ap, at), data);*/
791 if (at->at_probe != ATA_PROBE_FAILED) {
792 at->at_probe = ATA_PROBE_FAILED;
793 at->at_type = ATA_PORT_T_NONE;
794 at->at_features |= ATA_PORT_F_RESCAN;
795 kprintf("%s: HOTPLUG (PM) - Device removed\n",
799 if (at->at_probe == ATA_PROBE_FAILED) {
800 at->at_probe = ATA_PROBE_NEED_HARD_RESET;
801 at->at_features |= ATA_PORT_F_RESCAN;
802 kprintf("%s: HOTPLUG (PM) - Device inserted\n",
812 ahci_pm_read(struct ahci_port *ap, int target, int which, u_int32_t *datap)
817 xa = ahci_ata_get_xfer(ap, &ap->ap_ata[15]);
819 xa->fis->type = ATA_FIS_TYPE_H2D;
820 xa->fis->flags = ATA_H2D_FLAGS_CMD | 15;
821 xa->fis->command = ATA_C_READ_PM;
822 xa->fis->features = which;
823 xa->fis->device = target | ATA_H2D_DEVICE_LBA;
824 xa->fis->control = ATA_FIS_CONTROL_4BIT;
826 xa->complete = ahci_pm_dummy_done;
828 xa->flags = ATA_F_POLL | ATA_F_AUTOSENSE;
831 if (ahci_ata_cmd(xa) == ATA_S_COMPLETE) {
832 *datap = xa->rfis.sector_count | (xa->rfis.lba_low << 8) |
833 (xa->rfis.lba_mid << 16) | (xa->rfis.lba_high << 24);
836 kprintf("%s.%d pm_read SCA[%d] failed\n",
837 PORTNAME(ap), target, which);
841 ahci_ata_put_xfer(xa);
846 * Write a PM register
849 ahci_pm_write(struct ahci_port *ap, int target, int which, u_int32_t data)
854 xa = ahci_ata_get_xfer(ap, &ap->ap_ata[15]);
856 xa->fis->type = ATA_FIS_TYPE_H2D;
857 xa->fis->flags = ATA_H2D_FLAGS_CMD | 15;
858 xa->fis->command = ATA_C_WRITE_PM;
859 xa->fis->features = which;
860 xa->fis->device = target | ATA_H2D_DEVICE_LBA;
861 xa->fis->sector_count = (u_int8_t)data;
862 xa->fis->lba_low = (u_int8_t)(data >> 8);
863 xa->fis->lba_mid = (u_int8_t)(data >> 16);
864 xa->fis->lba_high = (u_int8_t)(data >> 24);
865 xa->fis->control = ATA_FIS_CONTROL_4BIT;
867 xa->complete = ahci_pm_dummy_done;
869 xa->flags = ATA_F_POLL;
872 if (ahci_ata_cmd(xa) == ATA_S_COMPLETE)
876 ahci_ata_put_xfer(xa);
881 * Dummy done callback for xa.
884 ahci_pm_dummy_done(struct ata_xfer *xa)