diff options
author | Lin Ming <ming.m.lin@intel.com> | 2012-06-25 08:13:06 (GMT) |
---|---|---|
committer | Jeff Garzik <jgarzik@redhat.com> | 2012-06-29 15:38:13 (GMT) |
commit | 3bd46600a7a7e938c54df8cdbac9910668c7dfb0 (patch) | |
tree | 72272f24842f7487b918a47c6e7244e92cad9ae4 /drivers/ata/libata-acpi.c | |
parent | febe53ba6b781862c12686c7ea1972bdedee457a (diff) | |
download | linux-fsl-qoriq-3bd46600a7a7e938c54df8cdbac9910668c7dfb0.tar.xz |
libata-acpi: add ata port runtime D3Cold support
ATA port may support runtime D3Cold state, for example, Zero-power ODD case.
This patch adds wakeup notifier and enable/disable run_wake during
supend/resume.
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/ata/libata-acpi.c')
-rw-r--r-- | drivers/ata/libata-acpi.c | 78 |
1 files changed, 74 insertions, 4 deletions
diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c index bb20fd5..e01807a 100644 --- a/drivers/ata/libata-acpi.c +++ b/drivers/ata/libata-acpi.c @@ -16,6 +16,7 @@ #include <linux/libata.h> #include <linux/pci.h> #include <linux/slab.h> +#include <linux/pm_runtime.h> #include <scsi/scsi_device.h> #include "libata.h" @@ -853,6 +854,7 @@ void ata_acpi_set_state(struct ata_port *ap, pm_message_t state) { struct ata_device *dev; acpi_handle handle; + int acpi_state; /* channel first and then drives for power on and vica versa for power off */ @@ -862,10 +864,23 @@ void ata_acpi_set_state(struct ata_port *ap, pm_message_t state) ata_for_each_dev(dev, &ap->link, ENABLED) { handle = ata_dev_acpi_handle(dev); - if (handle) - acpi_bus_set_power(handle, - state.event == PM_EVENT_ON ? - ACPI_STATE_D0 : ACPI_STATE_D3); + if (!handle) + continue; + + if (state.event != PM_EVENT_ON) { + acpi_state = acpi_pm_device_sleep_state( + &dev->sdev->sdev_gendev, NULL); + if (acpi_state > 0) + acpi_bus_set_power(handle, acpi_state); + /* TBD: need to check if it's runtime pm request */ + acpi_pm_device_run_wake( + &dev->sdev->sdev_gendev, true); + } else { + /* Ditto */ + acpi_pm_device_run_wake( + &dev->sdev->sdev_gendev, false); + acpi_bus_set_power(handle, ACPI_STATE_D0); + } } handle = ata_ap_acpi_handle(ap); @@ -965,6 +980,61 @@ void ata_acpi_on_disable(struct ata_device *dev) ata_acpi_clear_gtf(dev); } +static void ata_acpi_wake_dev(acpi_handle handle, u32 event, void *context) +{ + struct ata_device *ata_dev = context; + + if (event == ACPI_NOTIFY_DEVICE_WAKE && ata_dev && + pm_runtime_suspended(&ata_dev->sdev->sdev_gendev)) + scsi_autopm_get_device(ata_dev->sdev); +} + +static void ata_acpi_add_pm_notifier(struct ata_device *dev) +{ + struct acpi_device *acpi_dev; + acpi_handle handle; + acpi_status status; + + handle = ata_dev_acpi_handle(dev); + if (!handle) + return; + + status = acpi_bus_get_device(handle, &acpi_dev); + if (ACPI_SUCCESS(status)) { + acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, + ata_acpi_wake_dev, dev); + device_set_run_wake(&dev->sdev->sdev_gendev, true); + } +} + +static void ata_acpi_remove_pm_notifier(struct ata_device *dev) +{ + struct acpi_device *acpi_dev; + acpi_handle handle; + acpi_status status; + + handle = ata_dev_acpi_handle(dev); + if (!handle) + return; + + status = acpi_bus_get_device(handle, &acpi_dev); + if (ACPI_SUCCESS(status)) { + device_set_run_wake(&dev->sdev->sdev_gendev, false); + acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY, + ata_acpi_wake_dev); + } +} + +void ata_acpi_bind(struct ata_device *dev) +{ + ata_acpi_add_pm_notifier(dev); +} + +void ata_acpi_unbind(struct ata_device *dev) +{ + ata_acpi_remove_pm_notifier(dev); +} + static int compat_pci_ata(struct ata_port *ap) { struct device *dev = ap->tdev.parent; |