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Date: Fri, 31 Jan 2014 14:15:14 +0100
From: Alexandre COFFIGNAL <acoffignal@geral.com>
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Subject: Re: [Xenomai] imx28 rtcan flexcan system freezes
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Le 29/01/2014 18:58, Gilles Chanteperdrix a écrit :
> On 01/29/2014 04:50 PM, Alexandre COFFIGNAL wrote:
>>
>> Le 29/01/2014 08:16, Wolfgang Grandegger a écrit :
>>> On Tue, 28 Jan 2014 23:06:54 +0100, Gilles Chanteperdrix
>>> <gilles.chanteperdrix@xenomai.org> wrote:
>>>> On 01/27/2014 08:56 AM, Wolfgang Grandegger wrote:
>>>>> On Sun, 26 Jan 2014 21:56:10 +0100, Gilles Chanteperdrix
>>>>>> IMO, it is not just for the flexcan driver, it will avoid unaligned
>>>>>> accesses for all drivers which access data 4 bytes at a time. And 
>>>>>> I do
>>>>>> not think it "breaks" anything. What I do not know is:
>>>>>
>>>>>
>>>>> But it's just the Flexcan driver which is doing unaligned accesses.
>>>> Ok, can we agree on the following patch then?
>>>>
>>>> diff --git a/ksrc/drivers/can/rtcan_flexcan.c
>>>> b/ksrc/drivers/can/rtcan_flexcan.c
>>>> index 8f0e8d1..1674b73 100644
>>>> --- a/ksrc/drivers/can/rtcan_flexcan.c
>>>> +++ b/ksrc/drivers/can/rtcan_flexcan.c
>>>> @@ -38,6 +38,7 @@
>>>>    #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,5,0)
>>>>    #include <linux/pinctrl/consumer.h>
>>>>    #endif
>>>> +#include <asm/unaligned.h>
>>>>
>>>>    #include <rtdm/rtdm_driver.h>
>>>>
>>>> @@ -497,11 +498,9 @@ static void flexcan_rx_interrupt(struct
>>> rtcan_device
>>>> *dev,
>>>>            cf->can_id |= CAN_RTR_FLAG;
>>>>            skb->rb_frame_size = EMPTY_RB_FRAME_SIZE;
>>>>        } else {
>>>> -        skb->rb_frame_size = EMPTY_RB_FRAME_SIZE + cf->can_dlc ;
>>>> -        *(__be32 *)(cf->data + 0) =
>>>> -            cpu_to_be32(flexcan_read(&mb->data[0]));
>>>> -        *(__be32 *)(cf->data + 4) =
>>>> -            cpu_to_be32(flexcan_read(&mb->data[1]));
>>>> +        skb->rb_frame_size = EMPTY_RB_FRAME_SIZE + cf->can_dlc;
>>>> + put_unaligned_be32(flexcan_read(&mb->data[0]), cf->data + 0);
>>>> + put_unaligned_be32(flexcan_read(&mb->data[1]), cf->data + 4);
>>>>        }
>>>>
>>>>        /* Store the interface index */
>>> D'accord, thanks.
>>>
>>> Wolfgang.
>>>
>> Thank you all for your replies
>
> Hi Alexandre,
>
> Did you check the last patch? Does it compile and work for you?
>
> Regards.
>

I tested this patch, it works perfectly on i.MX28. Thank you very much.


Regards.