[FAQ] AM6412: USB compliance test pattern generation

SeanHC Lin

Intellectual 350 points

Part Number: AM6412

Hi TI,

How to generate USB compliance test from CPU In Linux kernel 5.10 on AM64xx.

I followed the instructions below.

TDA4VM: USB 2.0 host test mode

Set dr_mode to host.

# cat /proc/device-tree/bus\@f4000/cdns-usb\@f900000/usb\@f400000/dr_mode
host

# cat /proc/device-tree/bus\@f4000/cdns-usb\@f900000/usb\@f400000/compatible
cdns,usb3

Unbind the usb 2.0 hub befind CPU.

# echo '1-1' > /sys/bus/usb/drivers/usb/unbind

# lsusb -t
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 5000M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 480M

And, type the command to generate the test pattern.

# echo compliance > /sys/kernel/debug/usb/xhci/xhci-hcd.1.auto/ports/port01/portsc

# cat /sys/kernel/debug/usb/xhci/xhci-hcd.1.auto/ports/port01/portsc
PORTSC = 0xc000e63
Powered Connected Enabled Link:U3 PortSpeed:3 Change: Wake: WDE WOE

However, The CPU doesn't seem to generate any signals.

What are we missing here?

Or, is there any other way to generate test patterns?

Thanks,
Sean

over 1 year ago

0 Bin Liu over 1 year ago

TI__Guru*** 125666 points

Hi Sean,

The "USB compliance mode" and "USB compliance test pattern" are two different things.

To generate the USB compliance test pattern on AM64x, please run the following command on the Linux command line:

devmem2 0x0f410480 w 0xA0
devmem2 0x0f410080 w 0x4
devmem2 0x0f410484 w 0x40000000

0 SeanHC Lin over 1 year ago in reply to Bin Liu

Intellectual 350 points

It works, I can see the USB compliance test pattern generated by the CPU.

0 Bin Liu over 1 year ago in reply to SeanHC Lin

TI__Guru*** 125666 points

Hi Sean,

Thanks for the confirmation.

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[FAQ] AM6412: USB compliance test pattern generation