From bd3adca52bc43b72c75db3e4c7809d47923b154c Mon Sep 17 00:00:00 2001 From: Shaohua Li Date: Fri, 2 Nov 2007 09:32:38 +0800 Subject: 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 Acked-by: Len Brown Signed-off-by: Jeff Garzik --- drivers/ata/libata-acpi.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) (limited to 'drivers/ata/libata-acpi.c') diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c index 7bf4befd96bc..ebc4dfcf2f19 100644 --- a/drivers/ata/libata-acpi.c +++ b/drivers/ata/libata-acpi.c @@ -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 -- cgit 1.4.1