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- // SPDX-License-Identifier: GPL-2.0
- /*
- * ACPI support
- *
- * Copyright (C) 2020, Intel Corporation
- * Author: Mika Westerberg <mika.westerberg@linux.intel.com>
- */
- #include <linux/acpi.h>
- #include <linux/pm_runtime.h>
- #include "tb.h"
- static acpi_status tb_acpi_add_link(acpi_handle handle, u32 level, void *data,
- void **return_value)
- {
- struct fwnode_reference_args args;
- struct fwnode_handle *fwnode;
- struct tb_nhi *nhi = data;
- struct acpi_device *adev;
- struct pci_dev *pdev;
- struct device *dev;
- int ret;
- if (acpi_bus_get_device(handle, &adev))
- return AE_OK;
- fwnode = acpi_fwnode_handle(adev);
- ret = fwnode_property_get_reference_args(fwnode, "usb4-host-interface",
- NULL, 0, 0, &args);
- if (ret)
- return AE_OK;
- /* It needs to reference this NHI */
- if (nhi->pdev->dev.fwnode != args.fwnode)
- goto out_put;
- /*
- * Try to find physical device walking upwards to the hierarcy.
- * We need to do this because the xHCI driver might not yet be
- * bound so the USB3 SuperSpeed ports are not yet created.
- */
- dev = acpi_get_first_physical_node(adev);
- while (!dev) {
- adev = adev->parent;
- if (!adev)
- break;
- dev = acpi_get_first_physical_node(adev);
- }
- if (!dev)
- goto out_put;
- /*
- * Check that the device is PCIe. This is because USB3
- * SuperSpeed ports have this property and they are not power
- * managed with the xHCI and the SuperSpeed hub so we create the
- * link from xHCI instead.
- */
- while (dev && !dev_is_pci(dev))
- dev = dev->parent;
- if (!dev)
- goto out_put;
- /*
- * Check that this actually matches the type of device we
- * expect. It should either be xHCI or PCIe root/downstream
- * port.
- */
- pdev = to_pci_dev(dev);
- if (pdev->class == PCI_CLASS_SERIAL_USB_XHCI ||
- (pci_is_pcie(pdev) &&
- (pci_pcie_type(pdev) == PCI_EXP_TYPE_ROOT_PORT ||
- pci_pcie_type(pdev) == PCI_EXP_TYPE_DOWNSTREAM))) {
- const struct device_link *link;
- /*
- * Make them both active first to make sure the NHI does
- * not runtime suspend before the consumer. The
- * pm_runtime_put() below then allows the consumer to
- * runtime suspend again (which then allows NHI runtime
- * suspend too now that the device link is established).
- */
- pm_runtime_get_sync(&pdev->dev);
- link = device_link_add(&pdev->dev, &nhi->pdev->dev,
- DL_FLAG_AUTOREMOVE_SUPPLIER |
- DL_FLAG_RPM_ACTIVE |
- DL_FLAG_PM_RUNTIME);
- if (link) {
- dev_dbg(&nhi->pdev->dev, "created link from %s\n",
- dev_name(&pdev->dev));
- } else {
- dev_warn(&nhi->pdev->dev, "device link creation from %s failed\n",
- dev_name(&pdev->dev));
- }
- pm_runtime_put(&pdev->dev);
- }
- out_put:
- fwnode_handle_put(args.fwnode);
- return AE_OK;
- }
- /**
- * tb_acpi_add_links() - Add device links based on ACPI description
- * @nhi: Pointer to NHI
- *
- * Goes over ACPI namespace finding tunneled ports that reference to
- * @nhi ACPI node. For each reference a device link is added. The link
- * is automatically removed by the driver core.
- */
- void tb_acpi_add_links(struct tb_nhi *nhi)
- {
- acpi_status status;
- if (!has_acpi_companion(&nhi->pdev->dev))
- return;
- /*
- * Find all devices that have usb4-host-controller interface
- * property that references to this NHI.
- */
- status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 32,
- tb_acpi_add_link, NULL, nhi, NULL);
- if (ACPI_FAILURE(status))
- dev_warn(&nhi->pdev->dev, "failed to enumerate tunneled ports\n");
- }
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