[PATCH] net: macb: add TX stall timeout callback to recover from lost TSTART write

[Nicolai Buchwitz]

Hi Andrea

On 12.6.2026 14:51, Andrea della Porta wrote:

> [...]

>> 
>> The commit message describes it as RP1 specific, but it gets applied 
>> to all
>> other variants?
> 
> I've seen this issue happening only on RaspberryPi 5, but AFAIK it
> could affect also other MACB blocks connected through PCIe, so it
> may be widespread (even though it should have probably already been
> noticed in the past). In the orginal driver there's no timeout callback
> defined and this is much like pretgending the issue causing the timeout
> to happen to go away without doing anything (whatever the cause ot the
> specific hw are). So in my opinion we can just extend that to all MACB.
> Or maybe we should execute the restart conditionally on
> .compatible = "raspberrypi,rp1-gem"?

I just observed the issue once, but other people reported it to be 
happen more
frequently. If we can narrow down a reproducer, it would be good to test 
on other
blocks too (like EyeQ at Théo's).|

So maybe you can imagine a good repro for this issue?

Thanks,
Nicolai