Re: MCP251xFD runs interrupt handler twice per message.

[Marc Kleine-Budde <mkl@pengutronix.de>]

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On 17.01.2022 14:53:46, Markus Mirevik wrote:
> > That scope picture looks good! Can you include both runs of the IRQ
> > handler in one scope picture? I'm interested if there is activity or
> > a glich on IRQ line.
>  
> Both are included. The last (number 7) is the one extra reading of the
> register!?

Doh! Indeed, you'r right, missed that.

> > After you've that picture, you can try to catch glitches on the IRQ
> > line. If your scope allows this, setup a trigger on the INT channel
> > that triggers if the channel is low for considerably less then it
> > takes to clear the IRQ.
> > 
> > Currently it takes about 160µs to clear the IRQ, so setup a trigger
> > for less than 50µs.
>
> No glitches. The scope can trigger on glitch but no one is to be
> found.

Good.

It looks like this is not a problem of the mcp251xfd driver. I think now
it's time to ask an am335x expert. Maybe one of my coworker knows this
issue.

regards,
Marc

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