On Wed, Sep 25, 2019 at 07:43:53PM +0800, Kai-Heng Feng wrote:
Add pci_pr3_present() to check whether the platform supplies _PR3 to tell us which power resources the device depends on when in D3hot. This information is useful to let drivers choose different runtime suspend behavior. A user will be add in next patch.
This is mostly the same as nouveau_pr3_present().
Signed-off-by: Kai-Heng Feng kai.heng.feng@canonical.com
Acked-by: Bjorn Helgaas bhelgaas@google.com
I assume Takashi will merge this along with the ALSA patch.
v5:
- Add wording suggestion from Bjorn.
v4:
- Let caller to find its upstream port device.
drivers/pci/pci.c | 16 ++++++++++++++++ include/linux/pci.h | 2 ++ 2 files changed, 18 insertions(+)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index e7982af9a5d8..d03f624d8928 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -5856,6 +5856,22 @@ int pci_set_vga_state(struct pci_dev *dev, bool decode, return 0; }
+bool pci_pr3_present(struct pci_dev *pdev) +{
- struct acpi_device *adev;
- if (acpi_disabled)
return false;- adev = ACPI_COMPANION(&pdev->dev);
- if (!adev)
return false;- return adev->power.flags.power_resources &&
acpi_has_method(adev->handle, "_PR3");+} +EXPORT_SYMBOL_GPL(pci_pr3_present);
/**
- pci_add_dma_alias - Add a DMA devfn alias for a device
- @dev: the PCI device for which alias is added
diff --git a/include/linux/pci.h b/include/linux/pci.h index f9088c89a534..1d15c5d49cdd 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -2310,9 +2310,11 @@ struct irq_domain *pci_host_bridge_acpi_msi_domain(struct pci_bus *bus);
void pci_msi_register_fwnode_provider(struct fwnode_handle *(*fn)(struct device *)); +bool pci_pr3_present(struct pci_dev *pdev); #else static inline struct irq_domain * pci_host_bridge_acpi_msi_domain(struct pci_bus *bus) { return NULL; } +static bool pci_pr3_present(struct pci_dev *pdev) { return false; } #endif
#ifdef CONFIG_EEH
2.17.1