USB Serial Gadget Issue in LS208xA

priyadharshinik — Mon, 03 May 2021 14:58:01 GMT

Hi,

USB Serial gadget device comunication is not working on custom board based on LS2088a.

Enabled "dr_mode = peripheral" in device tree.

root@atomas:legacy# ls /sys/class/udc/3100000.usb/

a_alt_hnp_support device maximum_speed subsystem

a_hnp_support function power suppliers

b_hnp_enable is_a_peripheral soft_connect uevent

consumers is_otg srp

current_speed is_selfpowered state

root@atomas:legacy#

Installed serial gadget Driver

[ 870.419436] udc 3100000.usb: registering UDC driver [g_serial]

[ 870.419519] g_serial gadget: adding 'acm'/000000003a254470 to config 'CDC ACM config'/00000000e63ca627

[ 870.419533] g_serial gadget: acm ttyGS0: super speed IN/ep1in OUT/ep1out NOTIFY/ep2in

[ 870.419540] g_serial gadget: Gadget Serial v2.4

[ 870.419544] g_serial gadget: g_serial ready

root@atomas:legacy#

/dev/ttyGS0 node created.

USB Cable concected between PC and Target (USB Type A to Mini-B cable)

Device not detected in host

[32310656.199523] usb 2-1-port6: attempt power cycle

[32310656.803346] usb 2-1.6: new high-speed USB device number 3 using ehci-pci

[32310657.227333] usb 2-1.6: device not accepting address 3, error -71

[32310657.307351] usb 2-1.6: new high-speed USB device number 4 using ehci-pci

[32310657.731350] usb 2-1.6: device not accepting address 4, error -71

[32310657.731488] usb 2-1-port6: unable to enumerate USB device

[32312721.484618] usb 2-1.6: new high-speed USB device number 5 using ehci-pci

[32312721.576623] usb 2-1.6: device descriptor read/64, error -71

[32312721.776615] usb 2-1.6: device descriptor read/64, error -71

[32312721.964616] usb 2-1.6: new high-speed USB device number 6 using ehci-pci

[32312722.056613] usb 2-1.6: device descriptor read/64, error -71

[32312722.256614] usb 2-1.6: device descriptor read/64, error -71

[32312722.364790] usb 2-1-port6: attempt power cycle

[32312722.968616] usb 2-1.6: new high-speed USB device number 7 using ehci-pci

[32312723.392605] usb 2-1.6: device not accepting address 7, error -71

[32312723.472619] usb 2-1.6: new high-speed USB device number 8 using ehci-pci

[32312723.896606] usb 2-1.6: device not accepting address 8, error -71

[32312723.896755] usb 2-1-port6: unable to enumerate USB device

Please help to find out the issue.

Re: USB Serial Gadget Issue in LS208xA

yipingwang — Thu, 06 May 2021 08:26:46 GMT

Please refer to the following procedure to enable USB serial gadget.

Update Kernel menuconfig to enable serial gadget.

Build whole Linux kernel, below KO will be compiled:
- LD [M] drivers/usb/gadget/function/usb_f_acm.ko
- LD [M] drivers/usb/gadget/function/u_serial.ko
- LD [M] drivers/usb/gadget/function/usb_f_obex.ko
- LD [M] drivers/usb/gadget/function/usb_f_serial.ko
- LD [M] drivers/usb/gadget/legacy/g_serial.ko

Device Tree update, change property dr_mode’s data from “host” to “peripheral”, add property maximum-speed = “super-speed”

Copy related ko files to Layerscape board by using SD card, insmod ko on Layerscape board console

insmod libcomposite.ko
insmod u_serial.ko
insmod usb_f_acm.ko
insmod usb_f_obex.ko
insmod usb_f_serial.ko
insmod g_serial.ko

Please run cat /sys/class/tty/ttyGS0/dev to get the device major number, then run "mknod /dev/ttyGS0 c major_num 0".

Install Win7 Gadget serial driver on PC.
- Download: http://deviceinbox.com/drivers/998-gadget-serial-v2-4-driver.html

Connect USB cable between Layerscape and PC USB host port, then below message will pop on Layerscape platform:

Now you can see it on PC Device Manager

On PC, run PuTTY or similar tool to open COM port shown above (COM24)

Write test

On Layerscape board console, cat specific device file to ready receive data
- cat /dev/ttyGS0
Type some text on PuTTY console, now you can see the same content displayed on Layerscape board.

Read test

On Layerscape board console, echo some text to /dev/ttyGS0, then you can see it on PuTTY console.

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