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44 lines
1.2 KiB
Diff
44 lines
1.2 KiB
Diff
From: Felix Fietkau <nbd@nbd.name>
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Date: Mon, 28 Oct 2019 15:20:40 +0100
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Subject: [PATCH] backport: add pci_disable_link_state wrapper with return code
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The signature of pci_disable_link_state was changed to indicate if the state
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was successfully disabled. Since the old version did not have this, add a
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wrapper which checks the pcie register to determine the return code
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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--- a/backport-include/linux/pci.h
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+++ b/backport-include/linux/pci.h
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@@ -236,4 +236,29 @@ static inline struct pci_dev *pcie_find_
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(PCI_IRQ_LEGACY | PCI_IRQ_MSI | PCI_IRQ_MSIX)
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#endif
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+#if defined(CONFIG_PCI) && LINUX_VERSION_IS_LESS(5,3,0)
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+
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+static inline int
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+LINUX_BACKPORT(pci_disable_link_state)(struct pci_dev *pdev, int state)
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+{
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+ u16 aspmc;
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+
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+ pci_disable_link_state(pdev, state);
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+
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+ pcie_capability_read_word(pdev, PCI_EXP_LNKCTL, &aspmc);
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+ if ((state & PCIE_LINK_STATE_L0S) &&
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+ (aspmc & PCI_EXP_LNKCTL_ASPM_L0S))
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+ return -EPERM;
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+
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+ if ((state & PCIE_LINK_STATE_L1) &&
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+ (aspmc & PCI_EXP_LNKCTL_ASPM_L1))
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+ return -EPERM;
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+
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+ return 0;
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+}
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+
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+#define pci_disable_link_state LINUX_BACKPORT(pci_disable_link_state)
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+
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+#endif
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+
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#endif /* _BACKPORT_LINUX_PCI_H */
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