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>

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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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18

drivers/pci/pci.c

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2

include/linux/pci.h

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