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centosplus patch (bug#12277)
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Ref: https://patchwork.kernel.org/patch/9397341/
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--- a/drivers/pci/probe.c 2016-10-19 07:16:25.000000000 -0700
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+++ b/drivers/pci/probe.c 2016-11-28 09:30:30.621332097 -0800
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@@ -1426,6 +1426,16 @@ static void program_hpp_type1(struct pci
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dev_warn(&dev->dev, "PCI-X settings not supported\n");
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}
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+static bool pcie_get_upstream_rcb(struct pci_dev *dev)
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+{
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+ struct pci_dev *bridge = pci_upstream_bridge(dev);
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+ u16 lnkctl;
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+
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+ pcie_capability_read_word(bridge, PCI_EXP_LNKCTL, &lnkctl);
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+
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+ return lnkctl & PCI_EXP_LNKCTL_RCB;
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+}
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+
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static void program_hpp_type2(struct pci_dev *dev, struct hpp_type2 *hpp)
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{
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int pos;
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@@ -1455,9 +1465,21 @@ static void program_hpp_type2(struct pci
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~hpp->pci_exp_devctl_and, hpp->pci_exp_devctl_or);
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/* Initialize Link Control Register */
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- if (pcie_cap_has_lnkctl(dev))
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+ if (pcie_cap_has_lnkctl(dev)) {
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+ bool us_rcb;
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+ u16 clear;
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+ u16 set;
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+
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+ us_rcb = pcie_get_upstream_rcb(dev);
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+
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+ clear = ~hpp->pci_exp_lnkctl_and;
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+ set = hpp->pci_exp_lnkctl_or;
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+ if (!us_rcb)
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+ set &= ~PCI_EXP_LNKCTL_RCB;
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+
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pcie_capability_clear_and_set_word(dev, PCI_EXP_LNKCTL,
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- ~hpp->pci_exp_lnkctl_and, hpp->pci_exp_lnkctl_or);
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+ clear, set);
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+ }
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/* Find Advanced Error Reporting Enhanced Capability */
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pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
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