diff options
| author | Huang Ying <ying.huang@intel.com> | 2012-06-23 10:23:48 +0800 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2012-06-23 10:41:09 -0600 |
| commit | ee85f543710dd56ce526cb44e39191f32972e5ad (patch) | |
| tree | 13009358f0260d39c106b6708d6bb49f1d73279f /drivers/pci/pci-acpi.c | |
| parent | cfaf025112d3856637ff34a767ef785ef5cf2ca9 (diff) | |
| download | linux-ee85f543710dd56ce526cb44e39191f32972e5ad.tar.gz | |
ACPI/PM: specify lowest allowed state for device sleep state
Lower device sleep state can save more power, but has more exit latency too. Sometimes, to satisfy some power QoS and other requirement, we need to constrain the lowest device sleep state. In this patch, a parameter to specify lowest allowed state for acpi_pm_device_sleep_state is added. So that the caller can enforce the constraint via the parameter. This is needed by PCIe D3cold support, where the lowest power state allowed may be D3_HOT instead of default D3_COLD. CC: Len Brown <lenb@kernel.org> CC: linux-acpi@vger.kernel.org Reviewed-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Huang Ying <ying.huang@intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci/pci-acpi.c')
| -rw-r--r-- | drivers/pci/pci-acpi.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c index 61e2fefeedab..a9efebc586b4 100644 --- a/drivers/pci/pci-acpi.c +++ b/drivers/pci/pci-acpi.c @@ -189,7 +189,8 @@ static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev) { int acpi_state; - acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL); + acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL, + ACPI_STATE_D3); if (acpi_state < 0) return PCI_POWER_ERROR; |