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From: Wolfgang Grandegger <wg@grandegger.com>
To: Jesper Pedersen <jp@inntrasys.com>
Cc: Martin Kozusky <mkozusky@kkmicro.cz>,
	"linux-can@vger.kernel.org" <linux-can@vger.kernel.org>
Subject: Re: CAN messages being lost on i.MX25 with flexcan
Date: Thu, 19 Apr 2012 22:17:54 +0200	[thread overview]
Message-ID: <4F9072F2.7040101@grandegger.com> (raw)
In-Reply-To: <66F75347783FFB4C9FE794C540A5BFE85D28F4FB7F@I-SERVER02.inntrasys.local>

On 04/19/2012 10:00 PM, Jesper Pedersen wrote:
>>> What kernel version do you use? Do you use the flexcan driver from 
>>> that kernel? The problem is bus errors coming at high rate.
>>
>> I'm using 2.6.35.9 Preempt, the flexcan.c driver is original.
> 
> We use flexcan on an iMX25 device. The vanilla flexcan driver (we use kernel 3.0, but same issue also seen on 2.6.37) has some serious bugs that occasionally caused high CPU utilization or even total crashes on our platform.
> If I remember correctly, I found some IRQs which were not serviced correctly, causing the ISR to be triggered continuously.
> 
> We fixed it by pulling the flexcan.c driver from Wolfgangs linux-can-next tree. I don't recall, if you could just replace the original flexcan.c directly, or if some integration were required.

This confirms that the patch http://patchwork.ozlabs.org/patch/130761/
is need for the i.MX25 as well. I already told Martin to give it a try.

Wolfgang.

      reply	other threads:[~2012-04-19 20:17 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-04-19 10:04 CAN messages being lost on i.MX25 with flexcan Martin Kozusky
2012-04-19 10:54 ` Wolfgang Grandegger
2012-04-19 11:21   ` Martin Kozusky
2012-04-19 11:44     ` Wolfgang Grandegger
2012-04-19 11:58       ` Martin Kozusky
2012-04-19 13:37         ` Wolfgang Grandegger
2012-04-20  5:51           ` Martin Kozusky
2012-04-20  6:04             ` Wolfgang Grandegger
2012-04-20  6:17               ` Martin Kozusky
2012-04-20  7:59                 ` Wolfgang Grandegger
2012-04-19 20:00         ` Jesper Pedersen
2012-04-19 20:17           ` Wolfgang Grandegger [this message]

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