netdev - RE: [PATCH] flexcan: disable bus error interrupts for the i.MX28

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Date:	Tue, 9 Oct 2012 11:52:26 +0000
From:	Dong Aisheng-B29396 <B29396@...escale.com>
To:	Marc Kleine-Budde <mkl@...gutronix.de>
CC:	Wolfgang Grandegger <wg@...ndegger.com>,
	Shawn Guo <shawn.guo@...aro.org>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Linux-CAN <linux-can@...r.kernel.org>,
	Hui Wang <jason77.wang@...il.com>
Subject: RE: [PATCH] flexcan: disable bus error interrupts for the i.MX28

Hi Wolfgang,

>-----Original Message-----
>From: Dong Aisheng-B29396
>Sent: Monday, October 08, 2012 5:44 PM
>To: 'Marc Kleine-Budde'
>Cc: Wolfgang Grandegger; Shawn Guo; Linux Netdev List; Linux-CAN; Hui Wang
>Subject: RE: [PATCH] flexcan: disable bus error interrupts for the i.MX28
>
>>-----Original Message-----
>>From: Marc Kleine-Budde [mailto:mkl@...gutronix.de]
>>Sent: Monday, October 08, 2012 5:32 PM
>>To: Dong Aisheng-B29396
>>Cc: Wolfgang Grandegger; Shawn Guo; Linux Netdev List; Linux-CAN; Hui
>>Wang
>>Subject: Re: [PATCH] flexcan: disable bus error interrupts for the
>>i.MX28
>>Importance: High
>>
>>On 10/08/2012 11:13 AM, Dong Aisheng-B29396 wrote:
>>>>> I just checked our ic guy of flexcan, it seems he also had no sense
>>>>> of
>>>> this issue.
>>>>>
>>>>> Below is some version info what I got:
>>>>> Mx6s use FlexCAN3, with IP version 10.00.12.00
>>>>> Mx53 use FlexCAN2 (with glitch filter), with IP version 03.00.00.00
>>>>> Mx28 use FlexCAN2 (with glitch filter), with IP version 03.00.04.00
>>>>> Mx35 use FlexCAN2 (without glitch filter) , with IP version
>>>>> 03.00.00.00
>>>>> Mx25 use FlexCAN2 (without glitch filter), with IP version
>>>>> 03.00.00.00 I'm not sure if mx6q has such issue.
>>>>
>>>> OK, we need to find that out experimentally.
>>>>
>>> Our IC owner double checked the MX35 and MX53 IP and found the
>>> RX_WARN & TX_WARN Interrupt source actually are not connected to ARM.
>>
>>Does this mean it's a SoC problem, not a problem of the ip core?
>>
>It's not a problem of ip core, it's about how to use the IP.
>I do not know why some i.MX SoCs does not use rx/tx warn interrupts.
>
>>> That means flexcan will not trigger interrupt to ARM core even
>>> RX_WARN or TX_WARN Happens.
>>> This may be the root cause that why you cannot see RX_WARN interrupt
>>> if not enable bus error interrupt on mx35.
>>> He also checked that mx6q has the rx/tx warning interrupt connected
>>> to
>>arm.
>>> So we guess mx6q does not have this issue.
>>> Anyway, we can test to confirm.
>>
>>What about mx25?
>>
>For mx25 and mx28, he could not access it now.
>Will check tomorrow.
>
Just let you know:
The checking result is Mx28 has rx/tx warning interrupt line connected
while mx25 not.
Looks align with what we guess.

Regards
Dong Aisheng

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