diff options
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/core/usb-acpi.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/drivers/usb/core/usb-acpi.c b/drivers/usb/core/usb-acpi.c index 7f8a912d4fe2..21585ed89ef8 100644 --- a/drivers/usb/core/usb-acpi.c +++ b/drivers/usb/core/usb-acpi.c @@ -142,6 +142,53 @@ int usb_acpi_set_power_state(struct usb_device *hdev, int index, bool enable) } EXPORT_SYMBOL_GPL(usb_acpi_set_power_state); +/** + * usb_acpi_add_usb4_devlink - add device link to USB4 Host Interface for tunneled USB3 devices + * + * @udev: Tunneled USB3 device connected to a roothub. + * + * Adds a device link between a tunneled USB3 device and the USB4 Host Interface + * device to ensure correct runtime PM suspend and resume order. This function + * should only be called for tunneled USB3 devices. + * The USB4 Host Interface this tunneled device depends on is found from the roothub + * port ACPI device specific data _DSD entry. + * + * Return: negative error code on failure, 0 otherwise + */ +static int usb_acpi_add_usb4_devlink(struct usb_device *udev) +{ + const struct device_link *link; + struct usb_port *port_dev; + struct usb_hub *hub; + + if (!udev->parent || udev->parent->parent) + return 0; + + hub = usb_hub_to_struct_hub(udev->parent); + port_dev = hub->ports[udev->portnum - 1]; + + struct fwnode_handle *nhi_fwnode __free(fwnode_handle) = + fwnode_find_reference(dev_fwnode(&port_dev->dev), "usb4-host-interface", 0); + + if (IS_ERR(nhi_fwnode)) + return 0; + + link = device_link_add(&port_dev->child->dev, nhi_fwnode->dev, + DL_FLAG_AUTOREMOVE_CONSUMER | + DL_FLAG_RPM_ACTIVE | + DL_FLAG_PM_RUNTIME); + if (!link) { + dev_err(&port_dev->dev, "Failed to created device link from %s to %s\n", + dev_name(&port_dev->child->dev), dev_name(nhi_fwnode->dev)); + return -EINVAL; + } + + dev_dbg(&port_dev->dev, "Created device link from %s to %s\n", + dev_name(&port_dev->child->dev), dev_name(nhi_fwnode->dev)); + + return 0; +} + /* * Private to usb-acpi, all the core needs to know is that * port_dev->location is non-zero when it has been set by the firmware. @@ -262,6 +309,12 @@ usb_acpi_find_companion_for_device(struct usb_device *udev) if (!hub) return NULL; + + /* Tunneled USB3 devices depend on USB4 Host Interface, set device link to it */ + if (udev->speed >= USB_SPEED_SUPER && + udev->tunnel_mode != USB_LINK_NATIVE) + usb_acpi_add_usb4_devlink(udev); + /* * This is an embedded USB device connected to a port and such * devices share port's ACPI companion. |