[BUG]odroid-c2 does not hotplug usb-devices

[Martin Blumenstingl]

Hi Otto,

On Mon, Dec 14, 2020 at 8:34 PM Otto Meier <gf435 at gmx.net> wrote:
>
> Hi Martin,
>
> Am 13.12.20 um 19:46 schrieb Martin Blumenstingl:
> > Hi Otto,
> >
> > On Mon, Dec 7, 2020 at 1:43 PM Otto Meier <gf435 at gmx.net> wrote:
> > [...]
> >>>> So with the latest u-boot and the kernel from https://github.com/chewitt/linux/tree/amlogic-5.10.y
> >>>> commit 725fc8df7898102f9031ba2075f763884ffa3ee8 everything is working again.
> >>>> USB does hotplugging as expected.
> >>> So, this fixes USB under Linux ?? It's not clear
> > if you have time it would be great if you could figure out which of
> > the patches from Christian's tree fixes USB hotplugging for you.
> > Or is it fixed in Linux 5.10-rcX even without any patches?
> >
> The new mainline kernel 5.10.0 from Linus, without any other patches
> does detect USB hotpluging,
> when using u-boot DMI: Hardkernel Co., Ltd. ODROID-C2/ODROID-C2, BIOS
> 2021.01-rc3-00039-gec79f5ce22-dirty 12/08/2020
> and the following u-boot patch:
[...]
> When i use the last unpatched emmc bootable u-boot 2020.04 the kernel
> boots, but usb hotplugging
> does not work.
Thank you for testing this!

> Hope this describes my findings. If i can help further, please give me a
> note.
to be honest: I am a bit lost here. I don't understand how the BOOT_*
pins interfere with USB.
I also don't have any Odroid-C2 board myself so I cannot do any
experiments myself.
Neil, please let me know if you have any idea here.


Best regards,
Martin