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Commit 11ef697b authored by Kristen Carlson Accardi's avatar Kristen Carlson Accardi Committed by Jeff Garzik
Browse files

[PATCH] libata: ACPI and _GTF support 



_GTF is an acpi method that is used to reinitialize the drive.  It returns
a task file containing ata commands that are sent back to the drive to restore
it to boot up defaults.

Signed-off-by: default avatarKristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
(cherry picked from 9c69cab24b51a89664f4c0dfaf8a436d32117624 commit)
parent 8a03d9a4

Documentation/kernel-parameters.txt

+5 −0
Original line number Diff line number Diff line
@@ -48,6 +48,7 @@ parameter is applicable: 
	ISAPNP	ISA PnP code is enabled.

	ISDN	Appropriate ISDN support is enabled.

	JOY	Appropriate joystick support is enabled.

	LIBATA  Libata driver is enabled

	LP	Printer support is enabled.

	LOOP	Loopback device support is enabled.

	M68k	M68k architecture is enabled.
@@ -1038,6 +1039,10 @@ and is between 256 and 4096 characters. It is defined in the file 
			emulation library even if a 387 maths coprocessor

			is present.



	noacpi		[LIBATA] Disables use of ACPI in libata suspend/resume

			when set.

			Format: <int>



	noaliencache	[MM, NUMA] Disables the allcoation of alien caches in

			the slab allocator.  Saves per-node memory, but will

			impact performance on real NUMA hardware.

drivers/ata/Kconfig

+13 −0
Original line number Diff line number Diff line
@@ -161,6 +161,19 @@ config SATA_INTEL_COMBINED 
	depends on IDE=y && !BLK_DEV_IDE_SATA && (SATA_AHCI || ATA_PIIX)

	default y



config SATA_ACPI

	bool

	depends on ACPI && PCI

	default y

	help

	  This option adds support for SATA-related ACPI objects.

	  These ACPI objects add the ability to retrieve taskfiles

	  from the ACPI BIOS and write them to the disk controller.

	  These objects may be related to performance, security,

	  power management, or other areas.

	  You can disable this at kernel boot time by using the

	  option libata.noacpi=1



config PATA_ALI

	tristate "ALi PATA support (Experimental)"

	depends on PCI && EXPERIMENTAL

drivers/ata/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -66,4 +66,4 @@ obj-$(CONFIG_ATA_GENERIC) += ata_generic.o 
obj-$(CONFIG_PATA_LEGACY)	+= pata_legacy.o



libata-objs	:= libata-core.o libata-scsi.o libata-sff.o libata-eh.o

libata-$(CONFIG_SATA_ACPI) += libata-acpi.o

drivers/ata/libata-acpi.c

0 → 100644
+602 −0
Original line number Diff line number Diff line 
/*

 * libata-acpi.c

 * Provides ACPI support for PATA/SATA.

 *

 * Copyright (C) 2006 Intel Corp.

 * Copyright (C) 2006 Randy Dunlap

 */



#include <linux/ata.h>

#include <linux/delay.h>

#include <linux/device.h>

#include <linux/errno.h>

#include <linux/kernel.h>

#include <linux/acpi.h>

#include <linux/libata.h>

#include <linux/pci.h>

#include "libata.h"



#include <acpi/acpi_bus.h>

#include <acpi/acnames.h>

#include <acpi/acnamesp.h>

#include <acpi/acparser.h>

#include <acpi/acexcep.h>

#include <acpi/acmacros.h>

#include <acpi/actypes.h>



#define SATA_ROOT_PORT(x)	(((x) >> 16) & 0xffff)

#define SATA_PORT_NUMBER(x)	((x) & 0xffff)	/* or NO_PORT_MULT */

#define NO_PORT_MULT		0xffff

#define SATA_ADR_RSVD		0xffffffff



#define REGS_PER_GTF		7

struct taskfile_array {

	u8	tfa[REGS_PER_GTF];	/* regs. 0x1f1 - 0x1f7 */

};





/**

 * sata_get_dev_handle - finds acpi_handle and PCI device.function

 * @dev: device to locate

 * @handle: returned acpi_handle for @dev

 * @pcidevfn: return PCI device.func for @dev

 *

 * This function is somewhat SATA-specific.  Or at least the

 * PATA & SATA versions of this function are different,

 * so it's not entirely generic code.

 *

 * Returns 0 on success, <0 on error.

 */

static int sata_get_dev_handle(struct device *dev, acpi_handle *handle,

					acpi_integer *pcidevfn)

{

	struct pci_dev	*pci_dev;

	acpi_integer	addr;



	pci_dev = to_pci_dev(dev);	/* NOTE: PCI-specific */

	/* Please refer to the ACPI spec for the syntax of _ADR. */

	addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);

	*pcidevfn = addr;

	*handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);

	if (!*handle)

		return -ENODEV;

	return 0;

}



/**

 * pata_get_dev_handle - finds acpi_handle and PCI device.function

 * @dev: device to locate

 * @handle: returned acpi_handle for @dev

 * @pcidevfn: return PCI device.func for @dev

 *

 * The PATA and SATA versions of this function are different.

 *

 * Returns 0 on success, <0 on error.

 */

static int pata_get_dev_handle(struct device *dev, acpi_handle *handle,

				acpi_integer *pcidevfn)

{

	unsigned int bus, devnum, func;

	acpi_integer addr;

	acpi_handle dev_handle, parent_handle;

	struct acpi_buffer buffer = {.length = ACPI_ALLOCATE_BUFFER,

					.pointer = NULL};

	acpi_status status;

	struct acpi_device_info	*dinfo = NULL;

	int ret = -ENODEV;

	struct pci_dev *pdev = to_pci_dev(dev);



	bus = pdev->bus->number;

	devnum = PCI_SLOT(pdev->devfn);

	func = PCI_FUNC(pdev->devfn);



	dev_handle = DEVICE_ACPI_HANDLE(dev);

	parent_handle = DEVICE_ACPI_HANDLE(dev->parent);



	status = acpi_get_object_info(parent_handle, &buffer);

	if (ACPI_FAILURE(status))

		goto err;



	dinfo = buffer.pointer;

	if (dinfo && (dinfo->valid & ACPI_VALID_ADR) &&

	    dinfo->address == bus) {

		/* ACPI spec for _ADR for PCI bus: */

		addr = (acpi_integer)(devnum << 16 | func);

		*pcidevfn = addr;

		*handle = dev_handle;

	} else {

		goto err;

	}



	if (!*handle)

		goto err;

	ret = 0;

err:

	kfree(dinfo);

	return ret;

}



struct walk_info {		/* can be trimmed some */

	struct device	*dev;

	struct acpi_device *adev;

	acpi_handle	handle;

	acpi_integer	pcidevfn;

	unsigned int	drivenum;

	acpi_handle	obj_handle;

	struct ata_port *ataport;

	struct ata_device *atadev;

	u32		sata_adr;

	int		status;

	char		basepath[ACPI_PATHNAME_MAX];

	int		basepath_len;

};



static acpi_status get_devices(acpi_handle handle,

				u32 level, void *context, void **return_value)

{

	acpi_status		status;

	struct walk_info	*winfo = context;

	struct acpi_buffer	namebuf = {ACPI_ALLOCATE_BUFFER, NULL};

	char			*pathname;

	struct acpi_buffer	buffer;

	struct acpi_device_info	*dinfo;



	status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &namebuf);

	if (status)

		goto ret;

	pathname = namebuf.pointer;



	buffer.length = ACPI_ALLOCATE_BUFFER;

	buffer.pointer = NULL;

	status = acpi_get_object_info(handle, &buffer);

	if (ACPI_FAILURE(status))

		goto out2;



	dinfo = buffer.pointer;



	/* find full device path name for pcidevfn */

	if (dinfo && (dinfo->valid & ACPI_VALID_ADR) &&

	    dinfo->address == winfo->pcidevfn) {

		if (ata_msg_probe(winfo->ataport))

			ata_dev_printk(winfo->atadev, KERN_DEBUG,

				":%s: matches pcidevfn (0x%llx)\n",

				pathname, winfo->pcidevfn);

		strlcpy(winfo->basepath, pathname,

			sizeof(winfo->basepath));

		winfo->basepath_len = strlen(pathname);

		goto out;

	}



	/* if basepath is not yet known, ignore this object */

	if (!winfo->basepath_len)

		goto out;



	/* if this object is in scope of basepath, maybe use it */

	if (strncmp(pathname, winfo->basepath,

	    winfo->basepath_len) == 0) {

		if (!(dinfo->valid & ACPI_VALID_ADR))

			goto out;

		if (ata_msg_probe(winfo->ataport))

			ata_dev_printk(winfo->atadev, KERN_DEBUG,

				"GOT ONE: (%s) root_port = 0x%llx,"

				" port_num = 0x%llx\n", pathname,

				SATA_ROOT_PORT(dinfo->address),

				SATA_PORT_NUMBER(dinfo->address));

		/* heuristics: */

		if (SATA_PORT_NUMBER(dinfo->address) != NO_PORT_MULT)

			if (ata_msg_probe(winfo->ataport))

				ata_dev_printk(winfo->atadev,

					KERN_DEBUG, "warning: don't"

					" know how to handle SATA port"

					" multiplier\n");

		if (SATA_ROOT_PORT(dinfo->address) ==

			winfo->ataport->port_no &&

		    SATA_PORT_NUMBER(dinfo->address) == NO_PORT_MULT) {

			if (ata_msg_probe(winfo->ataport))

				ata_dev_printk(winfo->atadev,

					KERN_DEBUG,

					"THIS ^^^^^ is the requested"

					" SATA drive (handle = 0x%p)\n",

					handle);

			winfo->sata_adr = dinfo->address;

			winfo->obj_handle = handle;

		}

	}

out:

	kfree(dinfo);

out2:

	kfree(pathname);



ret:

	return status;

}



/* Get the SATA drive _ADR object. */

static int get_sata_adr(struct device *dev, acpi_handle handle,

			acpi_integer pcidevfn, unsigned int drive,

			struct ata_port *ap,

			struct ata_device *atadev, u32 *dev_adr)

{

	acpi_status	status;

	struct walk_info *winfo;

	int		err = -ENOMEM;



	winfo = kzalloc(sizeof(struct walk_info), GFP_KERNEL);

	if (!winfo)

		goto out;



	winfo->dev = dev;

	winfo->atadev = atadev;

	winfo->ataport = ap;

	if (acpi_bus_get_device(handle, &winfo->adev) < 0)

		if (ata_msg_probe(ap))

			ata_dev_printk(winfo->atadev, KERN_DEBUG,

				"acpi_bus_get_device failed\n");

	winfo->handle = handle;

	winfo->pcidevfn = pcidevfn;

	winfo->drivenum = drive;



	status = acpi_get_devices(NULL, get_devices, winfo, NULL);

	if (ACPI_FAILURE(status)) {

		if (ata_msg_probe(ap))

			ata_dev_printk(winfo->atadev, KERN_DEBUG,

				"%s: acpi_get_devices failed\n",

				__FUNCTION__);

		err = -ENODEV;

	} else {

		*dev_adr = winfo->sata_adr;

		atadev->obj_handle = winfo->obj_handle;

		err = 0;

	}

	kfree(winfo);

out:

	return err;

}



/**

 * do_drive_get_GTF - get the drive bootup default taskfile settings

 * @ap: the ata_port for the drive

 * @ix: target ata_device (drive) index

 * @gtf_length: number of bytes of _GTF data returned at @gtf_address

 * @gtf_address: buffer containing _GTF taskfile arrays

 *

 * This applies to both PATA and SATA drives.

 *

 * The _GTF method has no input parameters.

 * It returns a variable number of register set values (registers

 * hex 1F1..1F7, taskfiles).

 * The <variable number> is not known in advance, so have ACPI-CA

 * allocate the buffer as needed and return it, then free it later.

 *

 * The returned @gtf_length and @gtf_address are only valid if the

 * function return value is 0.

 */

static int do_drive_get_GTF(struct ata_port *ap, int ix,

			unsigned int *gtf_length, unsigned long *gtf_address,

			unsigned long *obj_loc)

{

	acpi_status			status;

	acpi_handle			dev_handle = NULL;

	acpi_handle			chan_handle, drive_handle;

	acpi_integer			pcidevfn = 0;

	u32				dev_adr;

	struct acpi_buffer		output;

	union acpi_object 		*out_obj;

	struct device			*dev = ap->host->dev;

	struct ata_device		*atadev = &ap->device[ix];

	int				err = -ENODEV;



	*gtf_length = 0;

	*gtf_address = 0UL;

	*obj_loc = 0UL;



	if (noacpi)

		return 0;



	if (ata_msg_probe(ap))

		ata_dev_printk(atadev, KERN_DEBUG,

			"%s: ENTER: ap->id: %d, port#: %d\n",

			__FUNCTION__, ap->id, ap->port_no);



	if (!ata_dev_enabled(atadev) || (ap->flags & ATA_FLAG_DISABLED)) {

		if (ata_msg_probe(ap))

			ata_dev_printk(atadev, KERN_DEBUG, "%s: ERR: "

				"ata_dev_present: %d, PORT_DISABLED: %lu\n",

				__FUNCTION__, ata_dev_enabled(atadev),

				ap->flags & ATA_FLAG_DISABLED);

		goto out;

	}



	/* Don't continue if device has no _ADR method.

	 * _GTF is intended for known motherboard devices. */

	if (!(ap->cbl == ATA_CBL_SATA)) {

		err = pata_get_dev_handle(dev, &dev_handle, &pcidevfn);

		if (err < 0) {

			if (ata_msg_probe(ap))

				ata_dev_printk(atadev, KERN_DEBUG,

					"%s: pata_get_dev_handle failed (%d)\n",

					__FUNCTION__, err);

			goto out;

		}

	} else {

		err = sata_get_dev_handle(dev, &dev_handle, &pcidevfn);

		if (err < 0) {

			if (ata_msg_probe(ap))

				ata_dev_printk(atadev, KERN_DEBUG,

					"%s: sata_get_dev_handle failed (%d\n",

					__FUNCTION__, err);

			goto out;

		}

	}



	/* Get this drive's _ADR info. if not already known. */

	if (!atadev->obj_handle) {

		if (!(ap->cbl == ATA_CBL_SATA)) {

			/* get child objects of dev_handle == channel objects,

	 		 * + _their_ children == drive objects */

			/* channel is ap->port_no */

			chan_handle = acpi_get_child(dev_handle,

						ap->port_no);

			if (ata_msg_probe(ap))

				ata_dev_printk(atadev, KERN_DEBUG,

					"%s: chan adr=%d: chan_handle=0x%p\n",

					__FUNCTION__, ap->port_no,

					chan_handle);

			if (!chan_handle) {

				err = -ENODEV;

				goto out;

			}

			/* TBD: could also check ACPI object VALID bits */

			drive_handle = acpi_get_child(chan_handle, ix);

			if (!drive_handle) {

				err = -ENODEV;

				goto out;

			}

			dev_adr = ix;

			atadev->obj_handle = drive_handle;

		} else {	/* for SATA mode */

			dev_adr = SATA_ADR_RSVD;

			err = get_sata_adr(dev, dev_handle, pcidevfn, 0,

					ap, atadev, &dev_adr);

		}

		if (err < 0 || dev_adr == SATA_ADR_RSVD ||

		    !atadev->obj_handle) {

			if (ata_msg_probe(ap))

				ata_dev_printk(atadev, KERN_DEBUG,

					"%s: get_sata/pata_adr failed: "

					"err=%d, dev_adr=%u, obj_handle=0x%p\n",

					__FUNCTION__, err, dev_adr,

					atadev->obj_handle);

			goto out;

		}

	}



	/* Setting up output buffer */

	output.length = ACPI_ALLOCATE_BUFFER;

	output.pointer = NULL;	/* ACPI-CA sets this; save/free it later */



	/* _GTF has no input parameters */

	err = -EIO;

	status = acpi_evaluate_object(atadev->obj_handle, "_GTF",

					NULL, &output);

	if (ACPI_FAILURE(status)) {

		if (ata_msg_probe(ap))

			ata_dev_printk(atadev, KERN_DEBUG,

				"%s: Run _GTF error: status = 0x%x\n",

				__FUNCTION__, status);

		goto out;

	}



	if (!output.length || !output.pointer) {

		if (ata_msg_probe(ap))

			ata_dev_printk(atadev, KERN_DEBUG, "%s: Run _GTF: "

				"length or ptr is NULL (0x%llx, 0x%p)\n",

				__FUNCTION__,

				(unsigned long long)output.length,

				output.pointer);

		kfree(output.pointer);

		goto out;

	}



	out_obj = output.pointer;

	if (out_obj->type != ACPI_TYPE_BUFFER) {

		kfree(output.pointer);

		if (ata_msg_probe(ap))

			ata_dev_printk(atadev, KERN_DEBUG, "%s: Run _GTF: "

				"error: expected object type of "

				" ACPI_TYPE_BUFFER, got 0x%x\n",

				__FUNCTION__, out_obj->type);

		err = -ENOENT;

		goto out;

	}



	if (!out_obj->buffer.length || !out_obj->buffer.pointer ||

	    out_obj->buffer.length % REGS_PER_GTF) {

		if (ata_msg_drv(ap))

			ata_dev_printk(atadev, KERN_ERR,

				"%s: unexpected GTF length (%d) or addr (0x%p)\n",

				__FUNCTION__, out_obj->buffer.length,

				out_obj->buffer.pointer);

		err = -ENOENT;

		goto out;

	}



	*gtf_length = out_obj->buffer.length;

	*gtf_address = (unsigned long)out_obj->buffer.pointer;

	*obj_loc = (unsigned long)out_obj;

	if (ata_msg_probe(ap))

		ata_dev_printk(atadev, KERN_DEBUG, "%s: returning "

			"gtf_length=%d, gtf_address=0x%lx, obj_loc=0x%lx\n",

			__FUNCTION__, *gtf_length, *gtf_address, *obj_loc);

	err = 0;

out:

	return err;

}



/**

 * taskfile_load_raw - send taskfile registers to host controller

 * @ap: Port to which output is sent

 * @gtf: raw ATA taskfile register set (0x1f1 - 0x1f7)

 *

 * Outputs ATA taskfile to standard ATA host controller using MMIO

 * or PIO as indicated by the ATA_FLAG_MMIO flag.

 * Writes the control, feature, nsect, lbal, lbam, and lbah registers.

 * Optionally (ATA_TFLAG_LBA48) writes hob_feature, hob_nsect,

 * hob_lbal, hob_lbam, and hob_lbah.

 *

 * This function waits for idle (!BUSY and !DRQ) after writing

 * registers.  If the control register has a new value, this

 * function also waits for idle after writing control and before

 * writing the remaining registers.

 *

 * LOCKING: TBD:

 * Inherited from caller.

 */

static void taskfile_load_raw(struct ata_port *ap,

				struct ata_device *atadev,

				const struct taskfile_array *gtf)

{

	if (ata_msg_probe(ap))

		ata_dev_printk(atadev, KERN_DEBUG, "%s: (0x1f1-1f7): hex: "

			"%02x %02x %02x %02x %02x %02x %02x\n",

			__FUNCTION__,

			gtf->tfa[0], gtf->tfa[1], gtf->tfa[2],

			gtf->tfa[3], gtf->tfa[4], gtf->tfa[5], gtf->tfa[6]);



	if ((gtf->tfa[0] == 0) && (gtf->tfa[1] == 0) && (gtf->tfa[2] == 0)

	    && (gtf->tfa[3] == 0) && (gtf->tfa[4] == 0) && (gtf->tfa[5] == 0)

	    && (gtf->tfa[6] == 0))

		return;



	if (ap->ops->qc_issue) {

		struct ata_taskfile tf;

		unsigned int err;



		ata_tf_init(atadev, &tf);



		/* convert gtf to tf */

		tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; /* TBD */

		tf.protocol = atadev->class == ATA_DEV_ATAPI ?

			ATA_PROT_ATAPI_NODATA : ATA_PROT_NODATA;

		tf.feature = gtf->tfa[0];	/* 0x1f1 */

		tf.nsect   = gtf->tfa[1];	/* 0x1f2 */

		tf.lbal    = gtf->tfa[2];	/* 0x1f3 */

		tf.lbam    = gtf->tfa[3];	/* 0x1f4 */

		tf.lbah    = gtf->tfa[4];	/* 0x1f5 */

		tf.device  = gtf->tfa[5];	/* 0x1f6 */

		tf.command = gtf->tfa[6];	/* 0x1f7 */



		err = ata_exec_internal(atadev, &tf, NULL, DMA_NONE, NULL, 0);

		if (err && ata_msg_probe(ap))

			ata_dev_printk(atadev, KERN_ERR,

				"%s: ata_exec_internal failed: %u\n",

				__FUNCTION__, err);

	} else

		if (ata_msg_warn(ap))

			ata_dev_printk(atadev, KERN_WARNING,

				"%s: SATA driver is missing qc_issue function"

				" entry points\n",

				__FUNCTION__);

}



/**

 * do_drive_set_taskfiles - write the drive taskfile settings from _GTF

 * @ap: the ata_port for the drive

 * @atadev: target ata_device

 * @gtf_length: total number of bytes of _GTF taskfiles

 * @gtf_address: location of _GTF taskfile arrays

 *

 * This applies to both PATA and SATA drives.

 *

 * Write {gtf_address, length gtf_length} in groups of

 * REGS_PER_GTF bytes.

 */

static int do_drive_set_taskfiles(struct ata_port *ap,

		struct ata_device *atadev, unsigned int gtf_length,

		unsigned long gtf_address)

{

	int			err = -ENODEV;

	int			gtf_count = gtf_length / REGS_PER_GTF;

	int			ix;

	struct taskfile_array	*gtf;



	if (ata_msg_probe(ap))

		ata_dev_printk(atadev, KERN_DEBUG,

			"%s: ENTER: ap->id: %d, port#: %d\n",

			__FUNCTION__, ap->id, ap->port_no);



	if (noacpi || !(ap->cbl == ATA_CBL_SATA))

		return 0;



	if (!ata_dev_enabled(atadev) || (ap->flags & ATA_FLAG_DISABLED))

		goto out;

	if (!gtf_count)		/* shouldn't be here */

		goto out;



	if (gtf_length % REGS_PER_GTF) {

		if (ata_msg_drv(ap))

			ata_dev_printk(atadev, KERN_ERR,

				"%s: unexpected GTF length (%d)\n",

				__FUNCTION__, gtf_length);

		goto out;

	}



	for (ix = 0; ix < gtf_count; ix++) {

		gtf = (struct taskfile_array *)

			(gtf_address + ix * REGS_PER_GTF);



		/* send all TaskFile registers (0x1f1-0x1f7) *in*that*order* */

		taskfile_load_raw(ap, atadev, gtf);

	}



	err = 0;

out:

	return err;

}



/**

 * ata_acpi_exec_tfs - get then write drive taskfile settings

 * @ap: the ata_port for the drive

 *

 * This applies to both PATA and SATA drives.

 */

int ata_acpi_exec_tfs(struct ata_port *ap)

{

	int		ix;

	int		ret =0;

	unsigned int	gtf_length;

	unsigned long	gtf_address;

	unsigned long	obj_loc;



	if (noacpi)

		return 0;



	for (ix = 0; ix < ATA_MAX_DEVICES; ix++) {

		if (!ata_dev_enabled(&ap->device[ix]))

			continue;



		ret = do_drive_get_GTF(ap, ix,

				&gtf_length, &gtf_address, &obj_loc);

		if (ret < 0) {

			if (ata_msg_probe(ap))

				ata_port_printk(ap, KERN_DEBUG,

					"%s: get_GTF error (%d)\n",

					__FUNCTION__, ret);

			break;

		}



		ret = do_drive_set_taskfiles(ap, &ap->device[ix],

				gtf_length, gtf_address);

		kfree((void *)obj_loc);

		if (ret < 0) {

			if (ata_msg_probe(ap))

				ata_port_printk(ap, KERN_DEBUG,

					"%s: set_taskfiles error (%d)\n",

					__FUNCTION__, ret);

			break;

		}

	}



	return ret;

}

drivers/ata/libata-core.c

+7 −0
Original line number Diff line number Diff line
@@ -93,6 +93,10 @@ static int ata_probe_timeout = ATA_TMOUT_INTERNAL / HZ; 
module_param(ata_probe_timeout, int, 0444);

MODULE_PARM_DESC(ata_probe_timeout, "Set ATA probing timeout (seconds)");



int noacpi;

module_param(noacpi, int, 0444);

MODULE_PARM_DESC(noacpi, "Disables the use of ACPI in suspend/resume when set");



MODULE_AUTHOR("Jeff Garzik");

MODULE_DESCRIPTION("Library module for ATA devices");

MODULE_LICENSE("GPL");
@@ -1778,6 +1782,9 @@ int ata_bus_probe(struct ata_port *ap) 
	/* reset and determine device classes */

	ap->ops->phy_reset(ap);



	/* retrieve and execute the ATA task file of _GTF */

	ata_acpi_exec_tfs(ap);



	for (i = 0; i < ATA_MAX_DEVICES; i++) {

		dev = &ap->device[i];