diff options
Diffstat (limited to 'drivers/pci/pci-acpi.c')
| -rw-r--r-- | drivers/pci/pci-acpi.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c index bf545f719182..a05350a4e49c 100644 --- a/drivers/pci/pci-acpi.c +++ b/drivers/pci/pci-acpi.c @@ -1043,6 +1043,16 @@ bool acpi_pci_bridge_d3(struct pci_dev *dev) return false; } +static void acpi_pci_config_space_access(struct pci_dev *dev, bool enable) +{ + int val = enable ? ACPI_REG_CONNECT : ACPI_REG_DISCONNECT; + int ret = acpi_evaluate_reg(ACPI_HANDLE(&dev->dev), + ACPI_ADR_SPACE_PCI_CONFIG, val); + if (ret) + pci_dbg(dev, "ACPI _REG %s evaluation failed (%d)\n", + enable ? "connect" : "disconnect", ret); +} + int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state) { struct acpi_device *adev = ACPI_COMPANION(&dev->dev); @@ -1074,6 +1084,9 @@ int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state) if (dev_pm_qos_flags(&dev->dev, PM_QOS_FLAG_NO_POWER_OFF) == PM_QOS_FLAGS_ALL) return -EBUSY; + + /* Notify AML lack of PCI config space availability */ + acpi_pci_config_space_access(dev, false); } error = acpi_device_set_power(adev, state_conv[state]); @@ -1083,6 +1096,15 @@ int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state) pci_dbg(dev, "power state changed by ACPI to %s\n", acpi_power_state_string(adev->power.state)); + /* + * Notify AML of PCI config space availability. Config space is + * accessible in all states except D3cold; the only transitions + * that change availability are transitions to D3cold and from + * D3cold to D0. + */ + if (state == PCI_D0) + acpi_pci_config_space_access(dev, true); + return 0; } |