[PATCH] usb: gadget: atmel: reliably generate disconnect by disabling controller instead of toggling PULLD_DIS

[Zixun LI]

On Fri, Jun 13, 2025 at 11:22 AM Mattijs Korpershoek
<mkorpershoek at kernel.org> wrote:
>
>
> Mihai, Zixun, do you have any update on case No.01589331 ?
>
> I'd like to pick this up and some point so please keep me informed.
>
> Thank you
> Mattijs
>

Hi Mattijs,

The case was reported in early May and MCHP have also observed the
missing of detach event on host.

My latest measure shows a differential signal level about +-350mV
between DP&DM lines when
DETACH and PULLD_DIS bits are 1, much lower than the detachment
threshold of 625mV from
USB 2.0 specification Table 7.3.

>From my view the patch can be picked, even on an unaffected family it
won't have side effects.
Unless one day we decide to implement SAM9RL and SAM9G45 errata then
it needs to be retested.

Best Regards,
Zixun