1 // SPDX-License-Identifier: GPL-2.0
26 	fwnode = fwnode_find_reference(acpi_fwnode_handle(adev), "usb4-host-interface", 0);  in tb_acpi_add_link()
31 	if (dev_fwnode(&nhi->pdev->dev) != fwnode)  in tb_acpi_add_link()
35 	 * Ignore USB3 ports here as USB core will set up device links between  in tb_acpi_add_link()
37 	 * USB3 ports might not even have a physical device yet if xHCI driver  in tb_acpi_add_link()
58 		pm_runtime_get_sync(&pdev->dev);  in tb_acpi_add_link()
60 		link = device_link_add(&pdev->dev, &nhi->pdev->dev,  in tb_acpi_add_link()
65 			dev_dbg(&nhi->pdev->dev, "created link from %s\n",  in tb_acpi_add_link()
66 				dev_name(&pdev->dev));  in tb_acpi_add_link()
69 			dev_warn(&nhi->pdev->dev, "device link creation from %s failed\n",  in tb_acpi_add_link()
70 				 dev_name(&pdev->dev));  in tb_acpi_add_link()
73 		pm_runtime_put(&pdev->dev);  in tb_acpi_add_link()
82  * tb_acpi_add_links() - Add device links based on ACPI description
85  * Goes over ACPI namespace finding tunneled ports that reference to
96 	if (!has_acpi_companion(&nhi->pdev->dev))  in tb_acpi_add_links()
100 	 * Find all devices that have usb4-host-controller interface  in tb_acpi_add_links()
106 		dev_warn(&nhi->pdev->dev, "failed to enumerate tunneled ports\n");  in tb_acpi_add_links()
114  * tb_acpi_is_native() - Did the platform grant native TBT/USB4 control
116  * Returns %true if the platform granted OS native control over
127  * tb_acpi_may_tunnel_usb3() - Is USB3 tunneling allowed by the platform
140  * tb_acpi_may_tunnel_dp() - Is DisplayPort tunneling allowed by the platform
153  * tb_acpi_may_tunnel_pcie() - Is PCIe tunneling allowed by the platform
166  * tb_acpi_is_xdomain_allowed() - Are XDomain connections allowed
178 /* UUID for retimer _DSM: e0053122-795b-4122-8a5e-57be1d26acb3 */
188 	struct usb4_port *usb4 = port->usb4;  in tb_acpi_retimer_set_power()
194 	if (!usb4->can_offline)  in tb_acpi_retimer_set_power()
197 	adev = ACPI_COMPANION(&usb4->dev);  in tb_acpi_retimer_set_power()
202 	obj = acpi_evaluate_dsm_typed(adev->handle, &retimer_dsm_guid, 1,  in tb_acpi_retimer_set_power()
207 		return -EIO;  in tb_acpi_retimer_set_power()
210 	ret = obj->integer.value;  in tb_acpi_retimer_set_power()
225 	obj = acpi_evaluate_dsm_typed(adev->handle, &retimer_dsm_guid, 1,  in tb_acpi_retimer_set_power()
231 		return -EIO;  in tb_acpi_retimer_set_power()
234 	ret = obj->integer.value;  in tb_acpi_retimer_set_power()
239 			return ret == 1 ? 0 : -EBUSY;  in tb_acpi_retimer_set_power()
244 	return -EIO;  in tb_acpi_retimer_set_power()
248  * tb_acpi_power_on_retimers() - Call platform to power on retimers
254  * spec). Note if this returns %-EBUSY it means the type-C port is in
255  * non-USB4/TBT mode (there is non-USB4/TBT device connected).
267  * tb_acpi_power_off_retimers() - Call platform to power off retimers
298 		port_adev = acpi_find_child_by_adr(ACPI_COMPANION(&parent_sw->dev),  in tb_acpi_switch_find_companion()
299 						   port->port);  in tb_acpi_switch_find_companion()
303 		struct tb_nhi *nhi = sw->tb->nhi;  in tb_acpi_switch_find_companion()
306 		parent_adev = ACPI_COMPANION(&nhi->pdev->dev);  in tb_acpi_switch_find_companion()
321 	 *      Device (DFP0)		// Downstream port _ADR == lane 0 adapter  in tb_acpi_find_companion()
323 	 *          Device (UFP)	// Upstream port _ADR == lane 0 adapter  in tb_acpi_find_companion()
324 	 *      Device (DFP1)		// Downstream port _ADR == lane 0 adapter number  in tb_acpi_find_companion()
332 		return acpi_find_child_by_adr(ACPI_COMPANION(dev->parent),  in tb_acpi_find_companion()
333 					      tb_to_usb4_port_device(dev)->port->port);  in tb_acpi_find_companion()
345 	if (acpi_check_dsm(adev->handle, &retimer_dsm_guid, 1,  in tb_acpi_setup()
348 		usb4->can_offline = true;  in tb_acpi_setup()