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@xxxxxxxxx>
---
drivers/acpi/sleep.c | 2 ++
drivers/ata/libata-acpi.c | 78 ++++++++++++++++++++++++++++++++++++++++++---
drivers/ata/libata-scsi.c | 3 ++
drivers/ata/libata.h | 4 +++
4 files changed, 83 insertions(+), 4 deletions(-)
diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index 8856102..1784cb3 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -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
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;
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 2222635..8ec81ca 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -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;
diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index b0d5294..44a7939 100644
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -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 */
--
1.7.10
--
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