diff options
| author | Lin Ming <ming.m.lin@intel.com> | 2012-04-23 09:03:49 +0800 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2012-05-05 01:19:52 -0400 |
| commit | 1cc0c998fdf2cb665d625fb565a0d6db5c81c639 (patch) | |
| tree | 2768315b4d2217ea16082947bf995edfc40d5faf /drivers/pci | |
| parent | ec612fcf43e09f5e05d37baf4d3f138b3fcc2f3d (diff) | |
ACPI: Fix D3hot v D3cold confusion
Before this patch, ACPI_STATE_D3 incorrectly referenced D3hot
in some places, but D3cold in other places.
After this patch, ACPI_STATE_D3 always means ACPI_STATE_D3_COLD;
and all references to D3hot use ACPI_STATE_D3_HOT.
ACPI's _PR3 method is used to enter both D3hot and D3cold states.
What distinguishes D3hot from D3cold is the presence _PR3
(Power Resources for D3hot) If these resources are all ON,
then the state is D3hot. If _PR3 is not present,
or all _PR0 resources for the devices are OFF,
then the state is D3cold.
This patch applies after Linux-3.4-rc1.
A future syntax cleanup may remove ACPI_STATE_D3
to emphasize that it always means ACPI_STATE_D3_COLD.
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Acked-by: Rafael J. Wysocki <rjw@sisk.pl>
Reviewed-by: Aaron Lu <aaron.lu@amd.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/pci-acpi.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c index 0f150f271c2..1929c0c63b7 100644 --- a/drivers/pci/pci-acpi.c +++ b/drivers/pci/pci-acpi.c @@ -200,7 +200,7 @@ static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev) return PCI_D1; case ACPI_STATE_D2: return PCI_D2; - case ACPI_STATE_D3: + case ACPI_STATE_D3_HOT: return PCI_D3hot; case ACPI_STATE_D3_COLD: return PCI_D3cold; @@ -223,7 +223,7 @@ static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state) [PCI_D0] = ACPI_STATE_D0, [PCI_D1] = ACPI_STATE_D1, [PCI_D2] = ACPI_STATE_D2, - [PCI_D3hot] = ACPI_STATE_D3, + [PCI_D3hot] = ACPI_STATE_D3_HOT, [PCI_D3cold] = ACPI_STATE_D3 }; int error = -EINVAL; |