On 08.02.2017 15:44, Alexander Stein wrote:
This patch adds support for USB2 test mode (Test_J, Test_K, Test_SE0_NAK and Test_Packet) per XHCI spec 4.19.6. USB2 test mode is a required hardware feature for system integrators validating their hardware according to USB spec, regarding signal strength and stuff. It is purely a hardware test feature. Usually you need an oscilloscope and have to enable those test modes on the hardware. This will send some specific test patterns on D+/D-. There is no report available (in Linux itself) as it is purely externally visible. Regular USB usage is not possible at that time. Anyone (well access to e.g. /dev/bus/usb/001/001 provided) can use it by sending appropriate USB_PORT_FEAT_TEST requests to the hub. The same feature for ehci based hosts is already available at https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/usb/host/ehci-hub.c#n1267 Signed-off-by: "Wang, Yu" <yu.y.wang@xxxxxxxxx> Signed-off-by: "Li, Guanglei" <guangleix.li@xxxxxxxxx> Signed-off-by: "Wu, Hao" <hao.wu@xxxxxxxxx> Signed-off-by: Alexander Stein <alexander.stein@xxxxxxxxxxxxxxxxxxxxx> ---
I think there's a reworked series of this feature already posted at: http://marc.info/?l=linux-usb&m=148050258916147&w=2 But this change log is now better I was thinking about adding that to 4.12 -Mathias -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
