netdev - Re: [PATCH] socketcan: add a driver for FlexCAN controllers.

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Message-ID: <4C1B52A7.3060607@grandegger.com>
Date:	Fri, 18 Jun 2010 13:04:07 +0200
From:	Wolfgang Grandegger <wg@...ndegger.com>
To:	Marc Kleine-Budde <mkl@...gutronix.de>
CC:	socketcan-core@...ts.berlios.de, netdev@...r.kernel.org
Subject: Re: [PATCH] socketcan: add a driver for FlexCAN controllers.

On 06/18/2010 12:44 PM, Marc Kleine-Budde wrote:
> Wolfgang Grandegger wrote:
>> On 06/18/2010 12:16 PM, Marc Kleine-Budde wrote:
>>> Wolfgang Grandegger wrote:
>>>> Hi Hans-Jürgen,
>>>>
>>>> On 06/17/2010 12:52 PM, Hans J. Koch wrote:
>>>>> This adds a driver for FlexCAN based CAN controllers,
>>>>> e.g. found in Freescale i.MX35 SoCs.
>>>>>
>>>>> The original version of this driver was posted by Sascha Hauer in July 2009:
>>>>> http://kerneltrap.org/mailarchive/linux-netdev/2009/7/29/6251621
>>>>>
>>>>> I took this version, added NAPI support, and fixed some problems found
>>>>> during testing. Well, here is the result. Please review.
>>>> I briefly browsed the patch and various bits and pieces are missing or
>>>> not correctly implemented. Marc already pointed out a few of them:
>>>>
>>>> - I do not find can_put/get_echo_skb functions in the code. How is
>>>>   IFF_ECHO supposed to work?
>>> the driver uses hardware loopback
>>
>> OK, then
>>
>>   dev = alloc_candev(sizeof(struct flexcan_priv), 0);
>>
>> should be used (and TX_ECHO_SKB_MAX removed) in Hans-Jürgens driver.
>>
>>>> - Support for CAN_CTRLMODE_BERR_REPORTING and do_get_berr_counter()
>>>>   seems to be missing.
>>>>
>>>> - Make use of alloc_can_skb() and alloc_can_err_skb().
>>> the last two points are already addressed in my version of the driver.
>>
>> I do not see support for CAN_CTRLMODE_BERR_REPORTING in your driver
>> (which has nothing to do with do_get_berr_counter).
> 
> oh yes...sorry, got confused.
> 
> However I implemented CAN_CTRLMODE_BERR_REPORTING, i.e. turning of the
> bit error interrupts by default. This has the effect that no bus warning
> and bus passive interrupt was signalled.
> 
> I should add a comment to my driver.

I'm confused, CAN_CTRLMODE_BERR_REPORTING means that the user can enable
bus error reporting, which seems not be handled in the driver your sent.
See:

http://lxr.linux.no/linux/drivers/net/can/sja1000/sja1000.c#L134
http://lxr.linux.no/linux/drivers/net/can/sja1000/sja1000.c#L588

Wolfgang.
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