1 Link Layer Validation Device is a standard device for testing of Super
2 Speed Link Layer tests. These nodes are available in sysfs only when lvs
3 driver is bound with root hub device.
5 What: /sys/bus/usb/devices/.../get_dev_desc
7 Contact: Pratyush Anand <pratyush.anand@gmail.com>
9 Write to this node to issue "Get Device Descriptor"
10 for Link Layer Validation device. It is needed for TD.7.06.
12 What: /sys/bus/usb/devices/.../u1_timeout
14 Contact: Pratyush Anand <pratyush.anand@gmail.com>
16 Set "U1 timeout" for the downstream port where Link Layer
17 Validation device is connected. Timeout value must be between 0
18 and 127. It is needed for TD.7.18, TD.7.19, TD.7.20 and TD.7.21.
20 What: /sys/bus/usb/devices/.../u2_timeout
22 Contact: Pratyush Anand <pratyush.anand@gmail.com>
24 Set "U2 timeout" for the downstream port where Link Layer
25 Validation device is connected. Timeout value must be between 0
26 and 127. It is needed for TD.7.18, TD.7.19, TD.7.20 and TD.7.21.
28 What: /sys/bus/usb/devices/.../hot_reset
30 Contact: Pratyush Anand <pratyush.anand@gmail.com>
32 Write to this node to issue "Reset" for Link Layer Validation
33 device. It is needed for TD.7.29, TD.7.31, TD.7.34 and TD.7.35.
35 What: /sys/bus/usb/devices/.../u3_entry
37 Contact: Pratyush Anand <pratyush.anand@gmail.com>
39 Write to this node to issue "U3 entry" for Link Layer
40 Validation device. It is needed for TD.7.35 and TD.7.36.
42 What: /sys/bus/usb/devices/.../u3_exit
44 Contact: Pratyush Anand <pratyush.anand@gmail.com>
46 Write to this node to issue "U3 exit" for Link Layer
47 Validation device. It is needed for TD.7.36.
49 What: /sys/bus/usb/devices/.../enable_compliance
52 Write to this node to set the port to compliance mode to test
53 with Link Layer Validation device. It is needed for TD.7.34.
55 What: /sys/bus/usb/devices/.../warm_reset
58 Write to this node to issue "Warm Reset" for Link Layer Validation
59 device. It may be needed to properly reset an xHCI 1.1 host port if
60 compliance mode needed to be explicitly enabled.