netdev - Re: [PATCH] can: flexcan: fix irq flooding by clearing all interrupt sources

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Date:	Tue, 13 Dec 2011 17:22:06 +0100
From:	Wolfgang Grandegger <wg@...ndegger.com>
To:	Marc Kleine-Budde <mkl@...gutronix.de>
CC:	netdev@...r.kernel.org, linux-can@...r.kernel.org,
	Reuben Dowle <Reuben.Dowle@...ico.com>,
	Lothar Waßmann <LW@...O-electronics.de>
Subject: Re: [PATCH] can: flexcan: fix irq flooding by clearing all interrupt
 sources

On 12/13/2011 01:59 PM, Marc Kleine-Budde wrote:
> On 12/13/2011 01:53 PM, Wolfgang Grandegger wrote:
>>> I got my MX35PDK board working and can confirm, that the patch works on
>>> a i.mx35 as well. My testing also confirms, that the ESR TWRN_INT,
>>> RWRN_INT, FLEXCAN_ESR_BOFF_INT do not function as documented. These
>>> flags do show up once, together with ERR_INT, and then, after clearing,
>>> never again. Obviously a bug in the Flexcan logic. From the feedback we
>>> can say, that only the i.MX28 does behave differently (==correctly). All
>>> other seem to work with the current code:
>>>
>>>  Flexcan on
>>>  - i.mx25
>>>  - i.mx35
>>>  - i.mx53
>>>  - P1010/P1020
>>
>> But unfortunately, state change reporting looks different with this patch :)
> 
> Hmm - so not schedule for stable. What about your buf-off-handling, will
> this change the reporting again?

Well, as it is a serious problem on i.MX28, I would schedule this patch
for stable as well. The error and state change reporting is bogus on the
Flexcan anyhow. Without this patch, I get "active->warning->passive" if
I send a message with cable disconnect (no ack). With patch just
"active->warning". That's the same behaviour
as on the i.MX28, also with my new state and bus-off handling. See:

https://gitorious.org/~wgrandegger/linux-can/wg-linux-can-next/commit/bd3acb12dbb9551541d28ae8766c154d3cf6ed57

Wolfgang.

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