git.openwrt.org Git - openwrt/staging/jow.git/blob

   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Mon, 28 Oct 2019 15:20:40 +0100
   3 Subject: [PATCH] backport: add pci_disable_link_state wrapper with return code
   4
   5 The signature of pci_disable_link_state was changed to indicate if the state
   6 was successfully disabled. Since the old version did not have this, add a
   7 wrapper which checks the pcie register to determine the return code
   8
   9 Signed-off-by: Felix Fietkau <nbd@nbd.name>
  10 ---
  11
  12 --- a/backport-include/linux/pci.h
  13 +++ b/backport-include/linux/pci.h
  14 @@ -236,4 +236,29 @@ static inline struct pci_dev *pcie_find_
  15         (PCI_IRQ_LEGACY | PCI_IRQ_MSI | PCI_IRQ_MSIX)
  16  #endif
  17
  18 +#if defined(CONFIG_PCI) && LINUX_VERSION_IS_LESS(5,3,0)
  19 +
  20 +static inline int
  21 +LINUX_BACKPORT(pci_disable_link_state)(struct pci_dev *pdev, int state)
  22 +{
  23 +       u16 aspmc;
  24 +
  25 +       pci_disable_link_state(pdev, state);
  26 +
  27 +       pcie_capability_read_word(pdev, PCI_EXP_LNKCTL, &aspmc);
  28 +       if ((state & PCIE_LINK_STATE_L0S) &&
  29 +           (aspmc & PCI_EXP_LNKCTL_ASPM_L0S))
  30 +               return -EPERM;
  31 +
  32 +       if ((state & PCIE_LINK_STATE_L1) &&
  33 +           (aspmc & PCI_EXP_LNKCTL_ASPM_L1))
  34 +               return -EPERM;
  35 +
  36 +       return 0;
  37 +}
  38 +
  39 +#define pci_disable_link_state LINUX_BACKPORT(pci_disable_link_state)
  40 +
  41 +#endif
  42 +
  43  #endif /* _BACKPORT_LINUX_PCI_H */