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libata-acpi: add ata port runtime D3Cold support

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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>
This commit is contained in:
Lin Ming 2012-06-25 16:13:06 +08:00 committed by Jeff Garzik
parent febe53ba6b
commit 3bd46600a7
4 changed files with 83 additions and 4 deletions
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2
drivers/acpi/sleep.c
View File

@ -795,6 +795,7 @@ int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p)
*d_min_p = d_min;
return d_max;
}
EXPORT_SYMBOL(acpi_pm_device_sleep_state);
#endif /* CONFIG_PM */
#ifdef CONFIG_PM_SLEEP
@ -831,6 +832,7 @@ int acpi_pm_device_run_wake(struct device *phys_dev, bool enable)
return 0;
}
EXPORT_SYMBOL(acpi_pm_device_run_wake);
/**
* acpi_pm_device_sleep_wake - enable or disable the system wake-up

78
drivers/ata/libata-acpi.c
View File

@ -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;

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

@ -3445,6 +3445,7 @@ void ata_scsi_scan_host(struct ata_port *ap, int sync)
if (!IS_ERR(sdev)) {
dev->sdev = sdev;
scsi_device_put(sdev);
ata_acpi_bind(dev);
} else {
dev->sdev = NULL;
}
@ -3541,6 +3542,8 @@ static void ata_scsi_remove_dev(struct ata_device *dev)
mutex_lock(&ap->scsi_host->scan_mutex);
spin_lock_irqsave(ap->lock, flags);
ata_acpi_unbind(dev);
/* clearing dev->sdev is protected by host lock */
sdev = dev->sdev;
dev->sdev = NULL;

4
drivers/ata/libata.h
View File

@ -120,6 +120,8 @@ extern void ata_acpi_on_disable(struct ata_device *dev);
extern void ata_acpi_set_state(struct ata_port *ap, pm_message_t state);
extern int ata_acpi_register(void);
extern void ata_acpi_unregister(void);
extern void ata_acpi_bind(struct ata_device *dev);
extern void ata_acpi_unbind(struct ata_device *dev);
#else
static inline void ata_acpi_dissociate(struct ata_host *host) { }
static inline int ata_acpi_on_suspend(struct ata_port *ap) { return 0; }
@ -130,6 +132,8 @@ static inline void ata_acpi_set_state(struct ata_port *ap,
pm_message_t state) { }
static inline int ata_acpi_register(void) { return 0; }
static void ata_acpi_unregister(void) { }
static void ata_acpi_bind(struct ata_device *dev) { }
static void ata_acpi_unbind(struct ata_device *dev) { }
#endif
/* libata-scsi.c */