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PCI: Add a helper to check Power Resource Requirements _PR3 existence

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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>
This commit is contained in:
Kai-Heng Feng
2019-10-18 15:38:47 +08:00
committed by Takashi Iwai
parent acfedcbe1c
commit 52525b7a3c
2 changed files with 20 additions and 0 deletions
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include/linux/pci.h
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@@ -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