[PATCH] usb: dwc2: Add in version 4xx compatibility

[Mattijs Korpershoek]

Hi Greg,

On ven., avril 19, 2024 at 15:21, Greg Malysa <greg.malysa at timesys.com> wrote:

> Hi Mattijs,
>
>> Please avoid top-posting when replying, it makes following the
>> discussion more difficult:
>> https://www.kernel.org/doc/html/latest/process/submitting-patches.html#use-trimmed-interleaved-replies-in-email-discussions
>
> Will do. Sorry about that; I'm still learning about this approach to email.

No worries. There are quite some things to learn and we probably all did
this wrong when starting. Thank you for taking the time to learn and to contribute!

>
>> Looking at
>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=65dc2e725286106f99c6f6b78e3d9c52c15f3a9c
>>
>> we can see that the following is added:
>> #define DWC2_CORE_REV_MASK      0x0000ffff
>>
>> This makes me believe that the versioning follows a well known pattern.
>
> I can submit a v2 next week to bring it in line with the kernel's approach.

To me, it's fine as is.

>
>> Note that this change is also part of:
>> https://lore.kernel.org/all/20240328131811.94559-1-seashell11234455@gmail.com/
>
> Or if you prefer I can also drop our patch and we can pursue this
> linked patch with both 4xx compatibility and the 420a reset handling.

I think the patch you submitted is fine by itself, but I'd let Marek
decide since he is the maintainer for this part.

If you have access to the hardware that has a 4.20a dwc2 controller,
maybe you can help testing the patch above patch as well?

>
> Thanks,
> Greg