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authorRafael J. Wysocki <rjw@sisk.pl>2008-07-07 03:32:52 +0200
committerJesse Barnes <jbarnes@virtuousgeek.org>2008-07-07 16:25:43 -0700
commit44e4e66eeae5338b3ca0b28f8352e60bf18d5ba8 (patch)
tree27c32f382f7af839733cbdc5dedf4fc979708a05 /drivers/pci/pci-acpi.c
parent961d9120fa6f078492a1c762dd91f2c097e56c83 (diff)
PCI: rework pci_set_power_state function to call platform first
Rework pci_set_power_state() so that the platform callback is invoked before the native mechanism, if necessary. Also, make the function check if the device is power manageable by the platform before invoking the platform callback. This may matter if the device dependent on additional power resources controlled by the platform is being put into D0, in which case those power resources must be turned on before we attempt to handle the device itself. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Pavel Machek <pavel@suse.cz> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/pci/pci-acpi.c')
-rw-r--r--drivers/pci/pci-acpi.c16
1 files changed, 10 insertions, 6 deletions
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index e4df71ab79b..6bc0d8c870a 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -277,12 +277,11 @@ static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
[PCI_D3hot] = ACPI_STATE_D3,
[PCI_D3cold] = ACPI_STATE_D3
};
+ int error = -EINVAL;
- if (!handle)
- return -ENODEV;
/* If the ACPI device has _EJ0, ignore the device */
- if (ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
- return 0;
+ if (!handle || ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
+ return -ENODEV;
switch (state) {
case PCI_D0:
@@ -290,9 +289,14 @@ static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
case PCI_D2:
case PCI_D3hot:
case PCI_D3cold:
- return acpi_bus_set_power(handle, state_conv[state]);
+ error = acpi_bus_set_power(handle, state_conv[state]);
}
- return -EINVAL;
+
+ if (!error)
+ dev_printk(KERN_INFO, &dev->dev,
+ "power state changed by ACPI to D%d\n", state);
+
+ return error;
}
static struct pci_platform_pm_ops acpi_pci_platform_pm = {