[LE11] USB otg on odroid C2

karotrape · February 24, 2024 at 1:58 PM

Hello,

I'm giving a try to new build of le11 on my odroid c2. I was previously on le9.

My usb dac SA9023 connected using usb otg port is not detected. It is properly detected when plugged directly in usb classic port, but i get a lot of sound 'glitch', if i remember well, that's why i moved to usb otg for this device (bandwith issue.. ?).

This setup was working well with on LE9:

Code

LibreELEC:~ # uname -r
3.14.29

LibreELEC:~ # lsusb -t
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=dwc_otg/1p, 480M
   |__ Port 1: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 12M
   |__ Port 1: Dev 2, If 1, Class=Audio, Driver=snd-usb-audio, 12M
   |__ Port 1: Dev 2, If 3, Class=Audio, Driver=snd-usb-audio, 12M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=dwc_otg/1p, 480M
   |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M

But device is not detected on LE11:

Code

odroid:~ # uname -r
6.1.38

odroid:~ # lsusb -t
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=dwc2/1p, 480M
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
    
odroid:~ # modprobe dwc_otg
modprobe: FATAL: Module dwc_otg not found in directory /lib/modules/6.1.38

Do you have any info which could help me resolve this issue ?

Thx

**chewitt** · February 24, 2024 at 6:51 PM

CONFIG_USB_OTG=y is set in the kernel defconfig so it's built-in not a loadable module but dr_mode is set to "host" not "otg" in the upstream C2 device-tree so you'll need to change that; either with a tweaked and recompiled device-tree or with fdtput commands executed from userspace at boot-time.

karotrape · February 25, 2024 at 6:13 PM

Thanks, it's fixed !

Second usb port (micro usb) was just disabled in device tree. I just moved from disabled => okay, dac is now detected and seems working properly (no crackling sound like on other usb ports).

How to:

Shell session

# decompile dtb to dts format
dtc -I dtb -O dts -o meson-gxbb-odroidc2.dts meson-gxbb-odroidc2.dtb

# modify dts
...
usb@c9000000 {
    compatible = "amlogic,meson-gxbb-usb\0snps,dwc2";
    reg = <0x00 0xc9000000 0x00 0x40000>;
    interrupts = <0x00 0x1e 0x04>;
    clocks = <0x03 0x41>;
    clock-names = "otg";
    phys = <0x33>;
    phy-names = "usb2-phy";
    dr_mode = "host";
    status = "okay";  # was "disabled"
    phandle = <0x9a>;
};

usb@c9100000 {
    compatible = "amlogic,meson-gxbb-usb\0snps,dwc2";
    reg = <0x00 0xc9100000 0x00 0x40000>;
    interrupts = <0x00 0x1f 0x04>;
    clocks = <0x03 0x40>;
    clock-names = "otg";
    phys = <0x34>;
    phy-names = "usb2-phy";
    dr_mode = "host";
    status = "okay";
    phandle = <0x9b>;
};
...

# recompile dts to dtb
dtc -O dtb -o meson-gxbb-odroidc2.dtb meson-gxbb-odroidc2.dts

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**chewitt** · February 26, 2024 at 4:53 AM

If it's a simple "okay" enable I'd do that from userspace using an fdtput command that's executed by a systemd service; as updates will always overwrite the modified dtb with a clean one.

[LE11] USB otg on odroid C2

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