Re: [PATCH] flexcan: Acknowledge all interrupt sources in the IRQhandler

[Lothar WaÃmann]

Hi,

Marc Kleine-Budde writes:
> On 12/09/2011 02:47 PM, Lothar WaÃmann wrote:
> > Otherwise the handler will get stuck in an endless IRQ loop when an
> > interrupt condition occurs that is not being acked (e.g. TWRN)
> 
> On which CPU do you have this problem?
> 
on i.MX28.

> Seems that mx25/35 behave a bit different than mx28. But I had no time
> to dig into this, yet. BTW Wolfgang is just reworking error handling,
> can you please test his patches he recently posted on linux-can.
> 
The ESR of i.MX25 is completely identical to the i.MX28.
You should be able to reproduce the problem when trying to send a
message to a CAN interface with the transceiver disabled.
You will get a BIT0_ERR and the TWRN bit will be asserted and never
cleared leading to an endless interrupt loop.


Lothar WaÃmann
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