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- Link Layer Validation Device is a standard device for testing of Super
- Speed Link Layer tests. These nodes are available in sysfs only when lvs
- driver is bound with root hub device.
- What: /sys/bus/usb/devices/.../get_dev_desc
- Date: March 2014
- Contact: Pratyush Anand <[email protected]>
- Description:
- Write to this node to issue "Get Device Descriptor"
- for Link Layer Validation device. It is needed for TD.7.06.
- What: /sys/bus/usb/devices/.../u1_timeout
- Date: March 2014
- Contact: Pratyush Anand <[email protected]>
- Description:
- Set "U1 timeout" for the downstream port where Link Layer
- Validation device is connected. Timeout value must be between 0
- and 127. It is needed for TD.7.18, TD.7.19, TD.7.20 and TD.7.21.
- What: /sys/bus/usb/devices/.../u2_timeout
- Date: March 2014
- Contact: Pratyush Anand <[email protected]>
- Description:
- Set "U2 timeout" for the downstream port where Link Layer
- Validation device is connected. Timeout value must be between 0
- and 127. It is needed for TD.7.18, TD.7.19, TD.7.20 and TD.7.21.
- What: /sys/bus/usb/devices/.../hot_reset
- Date: March 2014
- Contact: Pratyush Anand <[email protected]>
- Description:
- Write to this node to issue "Reset" for Link Layer Validation
- device. It is needed for TD.7.29, TD.7.31, TD.7.34 and TD.7.35.
- What: /sys/bus/usb/devices/.../u3_entry
- Date: March 2014
- Contact: Pratyush Anand <[email protected]>
- Description:
- Write to this node to issue "U3 entry" for Link Layer
- Validation device. It is needed for TD.7.35 and TD.7.36.
- What: /sys/bus/usb/devices/.../u3_exit
- Date: March 2014
- Contact: Pratyush Anand <[email protected]>
- Description:
- Write to this node to issue "U3 exit" for Link Layer
- Validation device. It is needed for TD.7.36.
- What: /sys/bus/usb/devices/.../enable_compliance
- Date: July 2017
- Description:
- Write to this node to set the port to compliance mode to test
- with Link Layer Validation device. It is needed for TD.7.34.
- What: /sys/bus/usb/devices/.../warm_reset
- Date: July 2017
- Description:
- Write to this node to issue "Warm Reset" for Link Layer Validation
- device. It may be needed to properly reset an xHCI 1.1 host port if
- compliance mode needed to be explicitly enabled.
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