Re: Losing CAN messages with socket-CAN

[Wolfgang Grandegger <wg@grandegger.com>]

On 04/04/2013 06:16 PM, j.p.lammertink wrote:
> Hi Wolfgang,
> 
> It looks like you can help us out. That would realy be great!
> I've collected answers to your questions and pasted them below.

...

> <>This CAN controller identifies itself (according to data sheet) as follows:
> <>    Vendor Identification Register    8086h
> <>    Device Identification Register    8818h
> <>    Revision Identification Register  00h
> <>    Class Code Register               0C0900h
> 
> < Ah, the "pch_can" driver does have known issues. End of last year I sent
> < some patches to improve the "pch_can" or, even better, make the "c_can"
> < driver work on the EG20T as well. See:
> 
> <   http://marc.info/?l=linux-can&m=135531975013055&w=2
> 
> < Are you able to build and use a recent mainline kernel? I need to figure
> < out how to help you best.
> 
> Currently a colleage of mine is attempting to build the kernel (to be able to
> apply patches to solve a display issue). I expect he will succeed one of these
> days.
> Wouldn't it be simplest just to use the latest sources of this driver?

These patches are not yet mainline because they do not fix all issues. I
do not have a system at hand and therefore somebody else needs to take
care. We actually want to drop the pch_can driver in favor of an updated
c_can driver. If you go over the patch series I pointed out you will get
more information. Anyway, we got positive feedback especially with the
c_can driver for the EG20T.

> Can you tell me which sources I should look for? (Probably I've downloaded them
> already, but I wish to replace only the files that make the difference)

I think that patch 1/7 of the series may already fix your TX problems:

  http://marc.info/?l=linux-can&m=135526076021515&w=2
´
If you apply the remaining patches, you can select the "c_can_pci"
driver. If you get trouble with these patches I need to adapt them to a
more recent kernel version.

Wolfgang.