From mboxrd@z Thu Jan  1 00:00:00 1970
From: Wolfgang Grandegger <wg@grandegger.com>
Subject: Re: pch_can: Data transmission stops after dropped packet
Date: Tue, 20 Nov 2012 17:12:14 +0100
Message-ID: <50ABABDE.8060503@grandegger.com>
References: <loom.20121114T160521-534@post.gmane.org> <50A4972A.9070707@hartkopp.net> <50A4EA87.9020206@grandegger.com> <loom.20121115T171319-854@post.gmane.org> <50A55C65.2020003@grandegger.com> <loom.20121115T222748-977@post.gmane.org> <50A95FC1.3050907@grandegger.com> <loom.20121119T155735-163@post.gmane.org> <50AA4FB3.7070009@grandegger.com> <loom.20121119T171647-35@post.gmane.org> <50AA5EE6.6060105@grandegger.com> <loom.20121119T183819-427@post.gmane.org> <50AA86DB.7000506@grandegger.com> <loom.20121119T211403-520@post.gmane.org> <50AAA8C8.2080504@grandegger.com> <loom.20121120T151831-134@post.gmane.org>
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To: Michael Pellegrini <mikep86@gmail.com>
Cc: linux-can@vger.kernel.org

On 11/20/2012 03:25 PM, Michael Pellegrini wrote:
> Wolfgang Grandegger <wg <at> grandegger.com> writes:
> 
>>
>> There is obviously still a problem when insmoding the driver. The only
>> significant difference vs. the pch_probe() is the line:
>>
>>   pci_set_master(pdev);
>>
>> which I have commented out. Furthermore I fixed another problem with the
>> register access (the shift was wrong). Please retry with the attached
>> c-can-pci-v3.tar.bz2.
>>
>> Wolfgang.
>>
>> Attachment (c-can-pci-v3.tar.bz2): application/x-bzip, 11 KiB
> 
> The new driver loads!  After loading the driver, I am able to see the CAN 
> interface in ifconfig.  Dmesg output after loading is:

Good news. Thanks for your patience.

> [ 4285.596420] c_can_pci 0000:02:0c.3: PCI INT C -> GSI 18 (level, low) -> IRQ 
> 18
> [ 4285.597107] c_can_pci 0000:02:0c.3: irq 41 for MSI/MSI-X
> [ 4285.597135] c_can_pci_probe: bar=1
> [ 4285.597191] c_can_pci_probe: addr=f8450000
> [ 4285.685151] c_can_pci_reset_pch: addr=f84501fc
> [ 4285.685332] c_can_pci 0000:02:0c.3: can0: setting BTR=0518 BRPE=0000
> 
> However, everything isn't fixed yet.  After sending a handful of messages, the 
> CAN interface hits the same problem that started this thread.  My application 
> prints the error "No buffer space available" and the only way to recover is an 
> interface reset via "ifconfig can0 down" followed by "ifconfig can0 up".

Could you please send the output of "candump any,0:0,#FFFFFFFF" while
sending the messages. Do they go out to the bus? Also "ip -d -s link
show can0" would be useful.

> Is there any information you need me to capture to assist you in debugging?

See above, for today.

Wolfgang.