diff options
| author | Shaohua Li <shaohua.li@intel.com> | 2007-11-02 09:32:38 +0800 |
|---|---|---|
| committer | Jeff Garzik <jeff@garzik.org> | 2008-01-23 05:24:09 -0500 |
| commit | bd3adca52bc43b72c75db3e4c7809d47923b154c (patch) | |
| tree | ec42456926e50a4b0adf916ac1c5f39f76e057f8 /drivers/ata | |
| parent | ae8d4ee7ff429136c8b482c3b38ed994c021d3fc (diff) | |
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>
Diffstat (limited to 'drivers/ata')
| -rw-r--r-- | drivers/ata/libata-acpi.c | 30 | ||||
| -rw-r--r-- | drivers/ata/libata-eh.c | 3 | ||||
| -rw-r--r-- | drivers/ata/libata.h | 3 |
3 files changed, 36 insertions, 0 deletions
diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c index 7bf4befd96b..ebc4dfcf2f1 100644 --- a/drivers/ata/libata-acpi.c +++ b/drivers/ata/libata-acpi.c @@ -776,6 +776,36 @@ 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 * diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c index 21a81cd148e..1d7faab6481 100644 --- a/drivers/ata/libata-eh.c +++ b/drivers/ata/libata-eh.c @@ -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); diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h index 048e26cfb33..8cf0874f248 100644 --- a/drivers/ata/libata.h +++ b/drivers/ata/libata.h @@ -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 */ |