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authorAaron Lu <aaron.lu@intel.com>2013-01-15 13:21:01 +0400
committerJeff Garzik <jgarzik@redhat.com>2013-01-22 00:41:56 +0400
commit213342053db58eabdaddff9c036c2b81ca63c443 (patch)
treee6c8b474717496289a5cbc3674e639f4814f784a /drivers/ata/libata-acpi.c
parent3dc67440d99b2c718ef5f1eb1424a9066ffa3fb9 (diff)
downloadlinux-213342053db58eabdaddff9c036c2b81ca63c443.tar.xz
libata: handle power transition of ODD
When ata port is runtime suspended, it will check if the ODD attched to it is a zero power(ZP) capable ODD and if the ZP capable ODD is in zero power ready state. And if this is not the case, the highest acpi state will be limited to ACPI_STATE_D3_HOT to avoid powering off the ODD. And if the ODD can be powered off, runtime wake capability needs to be enabled and powered_off flag will be set to let resume code knows that the ODD was in powered off state. And on resume, before it is powered on, if it was powered off during suspend, runtime wake capability needs to be disabled. After it is recovered, the ODD is considered functional, post power on processing like eject tray if the ODD is drawer type is done, and several ZPODD related fields will also be reset. Signed-off-by: Aaron Lu <aaron.lu@intel.com> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/ata/libata-acpi.c')
-rw-r--r--drivers/ata/libata-acpi.c35
1 files changed, 25 insertions, 10 deletions
diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c
index 446b4e761af0..6f72c648ea14 100644
--- a/drivers/ata/libata-acpi.c
+++ b/drivers/ata/libata-acpi.c
@@ -835,6 +835,22 @@ void ata_acpi_on_resume(struct ata_port *ap)
}
}
+static int ata_acpi_choose_suspend_state(struct ata_device *dev)
+{
+ int d_max_in = ACPI_STATE_D3_COLD;
+
+ /*
+ * For ATAPI, runtime D3 cold is only allowed
+ * for ZPODD in zero power ready state
+ */
+ if (dev->class == ATA_DEV_ATAPI &&
+ !(zpodd_dev_enabled(dev) && zpodd_zpready(dev)))
+ d_max_in = ACPI_STATE_D3_HOT;
+
+ return acpi_pm_device_sleep_state(&dev->sdev->sdev_gendev,
+ NULL, d_max_in);
+}
+
/**
* ata_acpi_set_state - set the port power state
* @ap: target ATA port
@@ -861,17 +877,16 @@ void ata_acpi_set_state(struct ata_port *ap, pm_message_t state)
continue;
if (state.event != PM_EVENT_ON) {
- acpi_state = acpi_pm_device_sleep_state(
- &dev->sdev->sdev_gendev, NULL, ACPI_STATE_D3);
- 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);
+ acpi_state = ata_acpi_choose_suspend_state(dev);
+ if (acpi_state == ACPI_STATE_D0)
+ continue;
+ if (zpodd_dev_enabled(dev) &&
+ acpi_state == ACPI_STATE_D3_COLD)
+ zpodd_enable_run_wake(dev);
+ acpi_bus_set_power(handle, acpi_state);
} else {
- /* Ditto */
- acpi_pm_device_run_wake(
- &dev->sdev->sdev_gendev, false);
+ if (zpodd_dev_enabled(dev))
+ zpodd_disable_run_wake(dev);
acpi_bus_set_power(handle, ACPI_STATE_D0);
}
}