Enabling High Speed Electrical Test Tool (HSET) support in Linux/Andorid builds?

Enabling the High Speed Electrical Test Tool (HSET) support in Linux?
A USB high speed host must pass electrical compliance tests defined by the USB-IF in order to use the High-speed Logo. These compliance tests require the host controller to support various test modes defined by the USB 2.0 specification.



USB-IF defines a windows based High Speed Electrical Test Tool (HSET) to activate various test modes. But for small devices with embedded USB host controller it may not be possible to use the tool because of the unavailability of windows platform. Therefore, USB-IF defines a standard method to initiate test modes on embedded hosts by using a test fixture. During enumeration by the USB host, this test fixture provides a VID/PID pair which is used by the host to initiate a particular test mode as each VID/PID pair corresponds to a unique test mode.



Following are the test modes PIDs supported by LE or Android builds:

PID Test Mode

0x0101 TEST_SE0_NAK

0x0102 TEST_J

0x0103 TEST_K

0x0104 TEST_PACKET

0x0106 HS_HOST_PORT_SUSPEND_RESUME

0x0107 SINGLE_STEP_GET_DEV_DESC

0x0108 SINGLE_STEP_SET_FEATURE



Detailed instructions to perform the "Embedded High-Speed host Electrical Tests" or EHSET host compliance tests can be found in the below doc.

http://www.usb.org/developers/onthego/EHSET_v1.01.pdf



OEMs need to check the below kernel option:

CONFIG_USB_EHCI_EHSET option needs to be enable in the kernel's default configuration for EHSET host compliance test support in the build.




Also refer to the solution# 00012725(What are kernel flags need to be defined to enable HS-USB Host configuration?) to check whether host mode is enabled or not.