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| author |   Kai-Heng Feng <kai.heng.feng@canonical.com> | 2019-10-18 15:38:47 +0800 |
|---|---|---|
| committer |   Takashi Iwai <tiwai@suse.de> | 2019-10-21 15:13:18 +0200 |
| commit | 52525b7a3cf82adec5c6cf0ecbd23ff228badc94 (patch) | |
| tree | 673ac3d1e755a12b1a04610066fa15366f56a1e9 /drivers/pci/pci.c | |
| parent | ALSA: firewire-lib: postpone to start IR context (diff) | |
| download | wireguard-linux-52525b7a3cf82adec5c6cf0ecbd23ff228badc94.tar.xz wireguard-linux-52525b7a3cf82adec5c6cf0ecbd23ff228badc94.zip | |
PCI: Add a helper to check Power Resource Requirements _PR3 existence
A driver may want to know the existence of _PR3, to 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>
Link: https://lore.kernel.org/r/20191018073848.14590-1-kai.heng.feng@canonical.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'drivers/pci/pci.c')
| -rw-r--r-- | drivers/pci/pci.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index e7982af9a5d8..1df99d9e350e 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -5856,6 +5856,24 @@ int pci_set_vga_state(struct pci_dev *dev, bool decode, return 0; } +#ifdef CONFIG_ACPI +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); +#endif + /** * pci_add_dma_alias - Add a DMA devfn alias for a device * @dev: the PCI device for which alias is added |