From: "Lothar Waßmann" <LW@KARO-electronics.de>
To: Marc Kleine-Budde <mkl@pengutronix.de>
Cc: Wolfgang Grandegger <wg@grandegger.com>,
linux-can@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] flexcan: Acknowledge all interrupt sources in the IRQ handler
Date: Fri, 9 Dec 2011 14:59:54 +0100 [thread overview]
Message-ID: <20194.5210.650914.867608@ipc1.ka-ro> (raw)
In-Reply-To: <4EE212AE.40005@pengutronix.de>
Hi,
Marc Kleine-Budde writes:
> On 12/09/2011 02:47 PM, Lothar Waßmann 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 Waßmann
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next prev parent reply other threads:[~2011-12-09 13:59 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-09 13:47 [PATCH] flexcan: Acknowledge all interrupt sources in the IRQ handler Lothar Waßmann
2011-12-09 13:52 ` Marc Kleine-Budde
2011-12-09 13:59 ` Lothar Waßmann [this message]
2011-12-09 14:35 ` Wolfgang Grandegger
2011-12-10 20:10 ` Wolfgang Grandegger
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