summaryrefslogtreecommitdiffstats
path: root/drivers/pci/quirks.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/pci/quirks.c')
-rw-r--r--drivers/pci/quirks.c97
1 files changed, 97 insertions, 0 deletions
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 03266af20d5..ca8a171f968 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -2986,6 +2986,103 @@ DECLARE_PCI_FIXUP_HEADER(0x1814, 0x0601, /* Ralink RT2800 802.11n PCI */
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_REALTEK, 0x8169,
quirk_broken_intx_masking);
+#ifdef CONFIG_ACPI
+/*
+ * Apple: Shutdown Cactus Ridge Thunderbolt controller.
+ *
+ * On Apple hardware the Cactus Ridge Thunderbolt controller needs to be
+ * shutdown before suspend. Otherwise the native host interface (NHI) will not
+ * be present after resume if a device was plugged in before suspend.
+ *
+ * The thunderbolt controller consists of a pcie switch with downstream
+ * bridges leading to the NHI and to the tunnel pci bridges.
+ *
+ * This quirk cuts power to the whole chip. Therefore we have to apply it
+ * during suspend_noirq of the upstream bridge.
+ *
+ * Power is automagically restored before resume. No action is needed.
+ */
+static void quirk_apple_poweroff_thunderbolt(struct pci_dev *dev)
+{
+ acpi_handle bridge, SXIO, SXFP, SXLV;
+
+ if (!dmi_match(DMI_BOARD_VENDOR, "Apple Inc."))
+ return;
+ if (pci_pcie_type(dev) != PCI_EXP_TYPE_UPSTREAM)
+ return;
+ bridge = ACPI_HANDLE(&dev->dev);
+ if (!bridge)
+ return;
+ /*
+ * SXIO and SXLV are present only on machines requiring this quirk.
+ * TB bridges in external devices might have the same device id as those
+ * on the host, but they will not have the associated ACPI methods. This
+ * implicitly checks that we are at the right bridge.
+ */
+ if (ACPI_FAILURE(acpi_get_handle(bridge, "DSB0.NHI0.SXIO", &SXIO))
+ || ACPI_FAILURE(acpi_get_handle(bridge, "DSB0.NHI0.SXFP", &SXFP))
+ || ACPI_FAILURE(acpi_get_handle(bridge, "DSB0.NHI0.SXLV", &SXLV)))
+ return;
+ dev_info(&dev->dev, "quirk: cutting power to thunderbolt controller...\n");
+
+ /* magic sequence */
+ acpi_execute_simple_method(SXIO, NULL, 1);
+ acpi_execute_simple_method(SXFP, NULL, 0);
+ msleep(300);
+ acpi_execute_simple_method(SXLV, NULL, 0);
+ acpi_execute_simple_method(SXIO, NULL, 0);
+ acpi_execute_simple_method(SXLV, NULL, 0);
+}
+DECLARE_PCI_FIXUP_SUSPEND_LATE(PCI_VENDOR_ID_INTEL, 0x1547,
+ quirk_apple_poweroff_thunderbolt);
+
+/*
+ * Apple: Wait for the thunderbolt controller to reestablish pci tunnels.
+ *
+ * During suspend the thunderbolt controller is reset and all pci
+ * tunnels are lost. The NHI driver will try to reestablish all tunnels
+ * during resume. We have to manually wait for the NHI since there is
+ * no parent child relationship between the NHI and the tunneled
+ * bridges.
+ */
+static void quirk_apple_wait_for_thunderbolt(struct pci_dev *dev)
+{
+ struct pci_dev *sibling = NULL;
+ struct pci_dev *nhi = NULL;
+
+ if (!dmi_match(DMI_BOARD_VENDOR, "Apple Inc."))
+ return;
+ if (pci_pcie_type(dev) != PCI_EXP_TYPE_DOWNSTREAM)
+ return;
+ /*
+ * Find the NHI and confirm that we are a bridge on the tb host
+ * controller and not on a tb endpoint.
+ */
+ sibling = pci_get_slot(dev->bus, 0x0);
+ if (sibling == dev)
+ goto out; /* we are the downstream bridge to the NHI */
+ if (!sibling || !sibling->subordinate)
+ goto out;
+ nhi = pci_get_slot(sibling->subordinate, 0x0);
+ if (!nhi)
+ goto out;
+ if (nhi->vendor != PCI_VENDOR_ID_INTEL
+ || (nhi->device != 0x1547 && nhi->device != 0x156c)
+ || nhi->subsystem_vendor != 0x2222
+ || nhi->subsystem_device != 0x1111)
+ goto out;
+ dev_info(&dev->dev, "quirk: wating for thunderbolt to reestablish pci tunnels...\n");
+ device_pm_wait_for_dev(&dev->dev, &nhi->dev);
+out:
+ pci_dev_put(nhi);
+ pci_dev_put(sibling);
+}
+DECLARE_PCI_FIXUP_RESUME_EARLY(PCI_VENDOR_ID_INTEL, 0x1547,
+ quirk_apple_wait_for_thunderbolt);
+DECLARE_PCI_FIXUP_RESUME_EARLY(PCI_VENDOR_ID_INTEL, 0x156d,
+ quirk_apple_wait_for_thunderbolt);
+#endif
+
static void pci_do_fixups(struct pci_dev *dev, struct pci_fixup *f,
struct pci_fixup *end)
{