Re: pch_can: Data transmission stops after dropped packet

[Wolfgang Grandegger <wg@grandegger.com>]

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.