Re: [PATCH net-next v4 05/12] net: ethernet: oa_tc6: implement error interrupts unmasking

[Andrew Lunn]

> After a considerable ammount of headscratching it seems that disabling collision
> detection on the macphy is the only way of getting it stable.
> When PLCA is enabled it's expected that CD causes problems, when running
> in CSMA/CD mode it was unexpected (for me at least).

Now we are back to, why is your system different? What is triggering a
collision for you, but not Parthiban?

There is nothing in the standard about reporting a collision. So this
is a Microchip extension? So the framework is not doing anything when
it happens, which will explain why it becomes a storm.... Until we do
have a mechanism to handle vendor specific interrupts, the frame work
should disable them all, to avoid this storm.

Does the datasheet document what to do on a collision? How are you
supposed to clear the condition?

       Andrew