Odroid n2+ usb broken on reboot

[neil.armstrong at linaro.org]

Hi,

+CC u-boot-amlogic at groups.io
+CC linux-amlogic at lists.infradead.org

On 05/05/2025 00:34, Wayne Schroeder wrote:
> Hello.  I am not sure if this is a bug, or even related to u-boot, but I am
> reporting it here because it was easiest to resolve via a u-boot change.
> 
> I am using u-boot-2025.04 (source) with a mainline linux from Arch Linux
> Arm.
> Linux alarm 6.14.4-1-aarch64-ARCH #1 SMP PREEMPT_DYNAMIC Sat Apr 26
> 13:02:01 MDT 2025 aarch64 GNU/Linux
> 
> On my odroid-n2+, the USB ports work on the first boot after power.  If I
> run shutdown -r now, or hit ctl-alt-del and otherwise reboot the system,
> the usb ports do not function at the next or subsequent boot up.

I think it's a very long term issue, USB lacks a proper reset at probe on
warm reset, does USB still work from U-Boot after the reboot ?

> 
> My apologies if this is not applicable to u-boot because it is a linux
> issue--I am not sure what the source of the issue is, but adjusting the
> u-boot .config after make odroid-n2_defconfig resolved the issue entirely.
> 
> I am booting via extlinux/extlinux.conf and have adjusted my
> CONFIG_BOOTCOMMAND before build to execute a usb reset prior to the
> existing run distro_bootcmd.
> 
> CONFIG_BOOTCOMMAND="usb reset; run distro_bootcmd"

I'm pretty sure there's driver callbacks we should implement to do the
same here, I need to check.

> 
> This has allowed me to reboot the system and successfully have access to
> the USB devices such as my keyboard, mouse, and root file system on USB3
> SSD.
> 
> Thanks!
> 
> Wayne