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List:       linux-can
Subject:    Re: m_can error/overrun frames on high speed
From:       Marc Kleine-Budde <mkl () pengutronix ! de>
Date:       2021-03-31 8:37:44
Message-ID: 20210331083744.pui7rtjexvejjvf6 () pengutronix ! de
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On 28.03.2021 08:31:14, Belisko Marek wrote:
> I have a beaglebone based board and I'm performing some tests.

As far as I know the beagle bone boards all have d_can controllers, not
m_can.

> I discovered that when set bitrate to 500k during replaying can file
> from PC to board ip detect 4-5 error/overrun frames. When comparing
> the original file with received one few lines in candump are missing.
> When decreased can speed to 125KB replaying the same file no
> error/overruns are detected and files are the same. I'm not can expert
> thus I'm asking for some advice on how to debug such phenomena. I'm
> using mainline 4.12 kernel which shows this symptom. I compared
> changes with the latest mainline kernel and there are few patches only
> which seems can influence can behavior (others are only cosmetical). I
> took :
> 
> 3cb3eaac52c0f145d895f4b6c22834d5f02b8569 - can: c_can: c_can_poll():
> only read status register after status IRQ
> 23c5a9488f076bab336177cd1d1a366bd8ddf087 - can: c_can: D_CAN:
> c_can_chip_config(): perform a sofware reset on open
> 6f12001ad5e79d0a0b08c599731d45c34cafd376 - can: c_can: C_CAN: add bus
> recovery events
> 
> I know most of the answers for such issues is to try latest kernel
> (i'm in process trying 5.10).

That's going into the right direction. Please try the lastest
net-next/master, which includes this merge:

https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=9c0ee085c49c11381dcbd609ea85e902eab88a92


regards,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |


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