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libata-acpi: add ACPI _PSx method 

ACPI spec (ver 3.0a, p289) requires IDE power on/off executes ACPI _PSx
methods. As recently most PATA drivers use libata, this patch adds _PSx
method support in libata. ACPI spec doesn't mention if SATA requires the
same _PSx method.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Acked-by: Len Brown <len.brown@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Shaohua Li 2007-11-02 09:32:38 +08:00 committed by Jeff Garzik
parent ae8d4ee7ff
commit bd3adca52b
3 changed files with 36 additions and 0 deletions
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30
drivers/ata/libata-acpi.c
View File

@ -775,6 +775,36 @@ void ata_acpi_on_resume(struct ata_port *ap)
}
}
/**
* ata_acpi_set_state - set the port power state
* @ap: target ATA port
* @state: 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 ata_acpi_set_state(struct ata_port *ap, pm_message_t state)
{
struct ata_device *dev;
if (!ap->acpi_handle || (ap->flags & ATA_FLAG_ACPI_SATA))
return;
/* channel first and then drives for power on and vica versa
for power off */
if (state.event == PM_EVENT_ON)
acpi_bus_set_power(ap->acpi_handle, ACPI_STATE_D0);
ata_link_for_each_dev(dev, &ap->link) {
if (dev->acpi_handle && ata_dev_enabled(dev))
acpi_bus_set_power(dev->acpi_handle,
state.event == PM_EVENT_ON ?
ACPI_STATE_D0 : ACPI_STATE_D3);
}
if (state.event != PM_EVENT_ON)
acpi_bus_set_power(ap->acpi_handle, ACPI_STATE_D3);
}
/**
* ata_acpi_on_devcfg - ATA ACPI hook called on device donfiguration
* @dev: target ATA device

3
drivers/ata/libata-eh.c
View File

@ -2747,6 +2747,7 @@ static void ata_eh_handle_port_suspend(struct ata_port *ap)
if (ap->ops->port_suspend)
rc = ap->ops->port_suspend(ap, ap->pm_mesg);
ata_acpi_set_state(ap, PMSG_SUSPEND);
out:
/* report result */
spin_lock_irqsave(ap->lock, flags);
@ -2792,6 +2793,8 @@ static void ata_eh_handle_port_resume(struct ata_port *ap)
WARN_ON(!(ap->pflags & ATA_PFLAG_SUSPENDED));
ata_acpi_set_state(ap, PMSG_ON);
if (ap->ops->port_resume)
rc = ap->ops->port_resume(ap);

3
drivers/ata/libata.h
View File

@ -114,6 +114,7 @@ extern int ata_acpi_on_suspend(struct ata_port *ap);
extern void ata_acpi_on_resume(struct ata_port *ap);
extern int ata_acpi_on_devcfg(struct ata_device *dev);
extern void ata_acpi_on_disable(struct ata_device *dev);
extern void ata_acpi_set_state(struct ata_port *ap, pm_message_t state);
#else
static inline void ata_acpi_associate_sata_port(struct ata_port *ap) { }
static inline void ata_acpi_associate(struct ata_host *host) { }
@ -122,6 +123,8 @@ static inline int ata_acpi_on_suspend(struct ata_port *ap) { return 0; }
static inline void ata_acpi_on_resume(struct ata_port *ap) { }
static inline int ata_acpi_on_devcfg(struct ata_device *dev) { return 0; }
static inline void ata_acpi_on_disable(struct ata_device *dev) { }
static inline void ata_acpi_set_state(struct ata_port *ap,
pm_message_t state) { }
#endif
/* libata-scsi.c */