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1Link Layer Validation Device is a standard device for testing of Super2Speed Link Layer tests. These nodes are available in sysfs only when lvs3driver is bound with root hub device.4 5What: /sys/bus/usb/devices/.../get_dev_desc6Date: March 20147Contact: Pratyush Anand <pratyush.anand@gmail.com>8Description:9 Write to this node to issue "Get Device Descriptor"10 for Link Layer Validation device. It is needed for TD.7.06.11 12What: /sys/bus/usb/devices/.../u1_timeout13Date: March 201414Contact: Pratyush Anand <pratyush.anand@gmail.com>15Description:16 Set "U1 timeout" for the downstream port where Link Layer17 Validation device is connected. Timeout value must be between 018 and 127. It is needed for TD.7.18, TD.7.19, TD.7.20 and TD.7.21.19 20What: /sys/bus/usb/devices/.../u2_timeout21Date: March 201422Contact: Pratyush Anand <pratyush.anand@gmail.com>23Description:24 Set "U2 timeout" for the downstream port where Link Layer25 Validation device is connected. Timeout value must be between 026 and 127. It is needed for TD.7.18, TD.7.19, TD.7.20 and TD.7.21.27 28What: /sys/bus/usb/devices/.../hot_reset29Date: March 201430Contact: Pratyush Anand <pratyush.anand@gmail.com>31Description:32 Write to this node to issue "Reset" for Link Layer Validation33 device. It is needed for TD.7.29, TD.7.31, TD.7.34 and TD.7.35.34 35What: /sys/bus/usb/devices/.../u3_entry36Date: March 201437Contact: Pratyush Anand <pratyush.anand@gmail.com>38Description:39 Write to this node to issue "U3 entry" for Link Layer40 Validation device. It is needed for TD.7.35 and TD.7.36.41 42What: /sys/bus/usb/devices/.../u3_exit43Date: March 201444Contact: Pratyush Anand <pratyush.anand@gmail.com>45Description:46 Write to this node to issue "U3 exit" for Link Layer47 Validation device. It is needed for TD.7.36.48 49What: /sys/bus/usb/devices/.../enable_compliance50Date: July 201751Description:52 Write to this node to set the port to compliance mode to test53 with Link Layer Validation device. It is needed for TD.7.34.54 55What: /sys/bus/usb/devices/.../warm_reset56Date: July 201757Description:58 Write to this node to issue "Warm Reset" for Link Layer Validation59 device. It may be needed to properly reset an xHCI 1.1 host port if60 compliance mode needed to be explicitly enabled.61