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

[Mattijs Korpershoek <mkorpershoek@kernel.org>]

On Fri, Jun 13, 2025 at 16:45, Zixun LI <admin@hifiphile.com> wrote:

> On Fri, Jun 13, 2025 at 11:22 AM Mattijs Korpershoek
> <mkorpershoek@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.

Ok, I will apply it. Since it's a bit late in the release cycle, I'll
send this out for -next.

Thanks again for your contribution!

Mattijs

>
> Best Regards,
> Zixun