[BUG] USB boot issue on ROCKPro64 with UEFI

[Arnaud Patard (Rtp)]

Vincent Stehlé <vincent.stehle at arm.com> writes:

Hi,

> Hi U-Boot folks,
>
> Hopefully this is the right way to report bugs. If not, please do not hesitate
> to let me know.
>
> I am hitting an issue with U-Boot v2021.07 on the ROCKPro64, when booting Linux
> with UEFI from USB. The kernel EFI stub will hang:
>
>   EFI stub: Booting Linux Kernel...
>   EFI stub: Using DTB from configuration table
>   EFI stub: Exiting boot services and installing virtual address map...
>
> After tracking it down, it appears efi_exit_boot_services() is ultimately
> calling OHCI hc_reset(), which hangs at this line:
>
>   1804         if (ohci_readl(&ohci->regs->control) & OHCI_CTRL_IR) {
>
> This seems to indicate reading the OHCI hardware control register cannot
> complete, which hints at a clocking issue.
>
> Looking in more details at the clocks changes performed on the
> efi_exit_boot_services() path, a workaround is indeed to prevent the USB2PHY
> clocks from being disabled (see the patch following this e-mail).
>
> I don't know enough about the RK3399 clock tree to fully understand what is
> going on here, and what would be a proper fix. Hopefully others will be able to
> continue from there.

I may be wrong but seems like the issue solved by
https://patchwork.ozlabs.org/project/uboot/patch/20210406151059.1187379-1-icenowy@aosc.io/
Unfortunately, I think that there has been no progress since the
submission of this patch.

Arnaud