Commit 5e32132b authored by Shaohua Li's avatar Shaohua Li Committed by Bartlomiej Zolnierkiewicz
Browse files

ide: hook ACPI _PSx method to IDE power on/off 



ACPI spec defines the sequence of IDE power on/off:
Powering down:
	Call _GTM.
	Power down drive (calls _PS3 method and turns off power planes).
Powering up:
	Power up drive (calls _PS0 method if present and turns on power planes).
	Call _STM passing info from _GTM (possibly modified), with ID data from
	each drive.
	Initialize the channel.
	May modify the results of _GTF.
	For each drive:
		Call _GTF.
		Execute task file (possibly modified).
This patch adds the missed _PS0/_PS3 methods call.

Signed-off-by: default avatarShaohua Li <shaohua.li@intel.com>
Acked-by: default avatarLen Brown <len.brown@intel.com>
Signed-off-by: default avatarBartlomiej Zolnierkiewicz <bzolnier@gmail.com>
parent 8cb1f567

drivers/acpi/bus.c

+3 −1
Original line number Diff line number Diff line
@@ -262,10 +262,12 @@ int acpi_bus_set_power(acpi_handle handle, int state) 
		printk(KERN_WARNING PREFIX

			      "Transitioning device [%s] to D%d\n",

			      device->pnp.bus_id, state);

	else

	else {

		device->power.state = state;

		ACPI_DEBUG_PRINT((ACPI_DB_INFO,

				  "Device [%s] transitioned to D%d\n",

				  device->pnp.bus_id, state));

	}



	return result;

}

drivers/ide/ide-acpi.c

+42 −0
Original line number Diff line number Diff line
@@ -611,6 +611,46 @@ void ide_acpi_push_timing(ide_hwif_t *hwif) 
}

EXPORT_SYMBOL_GPL(ide_acpi_push_timing);



/**

 * ide_acpi_set_state - set the channel power state

 * @hwif: target IDE interface

 * @on: state, on/off

 *

 * This function executes the _PS0/_PS3 ACPI method to set the power state.

 * ACPI spec requires _PS0 when IDE power on and _PS3 when power off

 */

void ide_acpi_set_state(ide_hwif_t *hwif, int on)

{

	int unit;



	if (ide_noacpi)

		return;



	DEBPRINT("ENTER:\n");



	if (!hwif->acpidata) {

		DEBPRINT("no ACPI data for %s\n", hwif->name);

		return;

	}

	/* channel first and then drives for power on and verse versa for power off */

	if (on)

		acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D0);

	for (unit = 0; unit < MAX_DRIVES; ++unit) {

		ide_drive_t *drive = &hwif->drives[unit];



		if (!drive->acpidata->obj_handle)

			drive->acpidata->obj_handle = ide_acpi_drive_get_handle(drive);



		if (drive->acpidata->obj_handle && drive->present) {

			acpi_bus_set_power(drive->acpidata->obj_handle,

				on? ACPI_STATE_D0: ACPI_STATE_D3);

		}

	}

	if (!on)

		acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D3);

}

EXPORT_SYMBOL_GPL(ide_acpi_set_state);



/**

 * ide_acpi_init - initialize the ACPI link for an IDE interface

 * @hwif: target IDE interface (channel)
@@ -679,6 +719,8 @@ void ide_acpi_init(ide_hwif_t *hwif) 
		return;

	}



	/* ACPI _PS0 before _STM */

	ide_acpi_set_state(hwif, 1);

	/*

	 * ACPI requires us to call _STM on startup

	 */

drivers/ide/ide.c

+12 −2
Original line number Diff line number Diff line
@@ -915,6 +915,7 @@ static int generic_ide_suspend(struct device *dev, pm_message_t mesg) 
	struct request rq;

	struct request_pm_state rqpm;

	ide_task_t args;

	int ret;



	/* Call ACPI _GTM only once */

	if (!(drive->dn % 2))
@@ -931,7 +932,14 @@ static int generic_ide_suspend(struct device *dev, pm_message_t mesg) 
		mesg.event = PM_EVENT_FREEZE;

	rqpm.pm_state = mesg.event;



	return ide_do_drive_cmd(drive, &rq, ide_wait);

	ret = ide_do_drive_cmd(drive, &rq, ide_wait);

	/* only call ACPI _PS3 after both drivers are suspended */

	if (!ret && (((drive->dn % 2) && hwif->drives[0].present

		 && hwif->drives[1].present)

		 || !hwif->drives[0].present

		 || !hwif->drives[1].present))

		ide_acpi_set_state(hwif, 0);

	return ret;

}



static int generic_ide_resume(struct device *dev)
@@ -944,8 +952,10 @@ static int generic_ide_resume(struct device *dev) 
	int err;



	/* Call ACPI _STM only once */

	if (!(drive->dn % 2))

	if (!(drive->dn % 2)) {

		ide_acpi_set_state(hwif, 1);

		ide_acpi_push_timing(hwif);

	}



	ide_acpi_exec_tfs(drive);

include/linux/ide.h

+2 −0
Original line number Diff line number Diff line
@@ -1338,11 +1338,13 @@ extern int ide_acpi_exec_tfs(ide_drive_t *drive); 
extern void ide_acpi_get_timing(ide_hwif_t *hwif);

extern void ide_acpi_push_timing(ide_hwif_t *hwif);

extern void ide_acpi_init(ide_hwif_t *hwif);

extern void ide_acpi_set_state(ide_hwif_t *hwif, int on);

#else

static inline int ide_acpi_exec_tfs(ide_drive_t *drive) { return 0; }

static inline void ide_acpi_get_timing(ide_hwif_t *hwif) { ; }

static inline void ide_acpi_push_timing(ide_hwif_t *hwif) { ; }

static inline void ide_acpi_init(ide_hwif_t *hwif) { ; }

static inline void ide_acpi_set_state(ide_hwif_t *hwif, int on) {}

#endif



extern int ide_hwif_request_regions(ide_hwif_t *hwif);

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