The fixup to enable relaxed ordering on all PCI devices was
executed unconditionally if the Tegra PCI host driver was
built into the kernel. This doesn't play nice with a
multiplatform kernel executed on other platforms which
may not need this fixup.
Make sure to only apply the fixup if the root port is
a Tegra.
Signed-off-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
---
drivers/pci/host/pci-tegra.c | 26 +++++++++++++++++++++++++-
1 file changed, 25 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c
index 3d43874319be..d5a14f22ebb8 100644
--- a/drivers/pci/host/pci-tegra.c
+++ b/drivers/pci/host/pci-tegra.c
@@ -647,10 +647,34 @@ DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf1, tegra_pcie_fixup_class);
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0e1c, tegra_pcie_fixup_class);
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0e1d, tegra_pcie_fixup_class);
+static int tegra_pcie_root_is_tegra(struct pci_dev *dev)
+{
+ struct pci_bus *bus = dev->bus;
+ struct pci_dev *root_bridge;
+
+ /* walk up the PCIe hierarchy to the first level below the root bus */
+ while (bus->parent && bus->parent->self)
+ bus = bus->parent;
+
+ /*
+ * If there is no bridge on the bus the passed device is the root
+ * bridge itself.
+ */
+ root_bridge = bus->self ? bus->self : dev;
+ if (root_bridge->vendor == PCI_VENDOR_ID_NVIDIA &&
+ (root_bridge->device == 0x0bf0 || root_bridge->device == 0x0bf1 ||
+ root_bridge->device == 0x0e1c || root_bridge->device == 0x0e1d ||
+ root_bridge->device == 0x0e12 || root_bridge->device == 0x0e13))
+ return 1;
+
+ return 0;
+}
/* Tegra PCIE requires relaxed ordering */
static void tegra_pcie_relax_enable(struct pci_dev *dev)
{
- pcie_capability_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_RELAX_EN);
+ if (tegra_pcie_root_is_tegra(dev))
+ pcie_capability_set_word(dev, PCI_EXP_DEVCTL,
+ PCI_EXP_DEVCTL_RELAX_EN);
}
DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, tegra_pcie_relax_enable);
--
2.1.1
--
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