Re: AW: mcp251xfd: Bad message receiption

[Marc Kleine-Budde <mkl@pengutronix.de>]

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On 22.12.2022 10:30:22, Stefan Althöfer wrote:
> Hi Thomas,
> 
> > Do I read the pdf correctly (based on the /var/log stuff) that you have two MCP2518FD connected to a Pi4B and 
> > both of them are running in internal/external loopback mode no interaction between them and the SPIs are separate?
> 
> Yes. For the loopback test the CANs are separate. Errors also occur when sending messages between
> the controllers, but I think that is more difficult to analyze.
> 
> root@raspberrypi:~# ip -d -s a s can0
> 4: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 72 qdisc pfifo_fast state UP group default qlen 1000
>     link/can  promiscuity 0 minmtu 0 maxmtu 0
>     can <LOOPBACK,BERR-REPORTING,FD> state ERROR-ACTIVE (berr-counter tx 0 rx 0) restart-ms 0
>           bitrate 1000000 sample-point 0.800
>           tq 25 prop-seg 15 phase-seg1 16 phase-seg2 8 sjw 6
>           mcp251xfd: tseg1 2..256 tseg2 1..128 sjw 1..128 brp 1..256 brp-inc 1
>           dbitrate 4000000 dsample-point 0.800
>           dtq 25 dprop-seg 3 dphase-seg1 4 dphase-seg2 2 dsjw 2
>           mcp251xfd: dtseg1 1..32 dtseg2 1..16 dsjw 1..16 dbrp 1..256 dbrp-inc 1
>           clock 40000000
>           re-started bus-errors arbit-lost error-warn error-pass bus-off
>           0          0          0          0          0          0         numtxqueues 1 numrxqueues 1 gso_max_size 65536 gso_max_segs 65535
>     RX: bytes  packets  errors  dropped missed  mcast
>     3097429872 2517466658 0       0       0       0
>     TX: bytes  packets  errors  dropped carrier collsns
>     3696197680 1258733264 0       0       0       0
> root@raspberrypi:~# ip -d -s a s can1
> 5: can1: <NOARP,UP,LOWER_UP,ECHO> mtu 72 qdisc pfifo_fast state UP group default qlen 1000
>     link/can  promiscuity 0 minmtu 0 maxmtu 0
>     can <LOOPBACK,BERR-REPORTING,FD> state ERROR-ACTIVE (berr-counter tx 0 rx 0) restart-ms 0
>           bitrate 1000000 sample-point 0.800
>           tq 25 prop-seg 15 phase-seg1 16 phase-seg2 8 sjw 6
>           mcp251xfd: tseg1 2..256 tseg2 1..128 sjw 1..128 brp 1..256 brp-inc 1
>           dbitrate 4000000 dsample-point 0.800
>           dtq 25 dprop-seg 3 dphase-seg1 4 dphase-seg2 2 dsjw 2
>           mcp251xfd: dtseg1 1..32 dtseg2 1..16 dsjw 1..16 dbrp 1..256 dbrp-inc 1
>           clock 40000000
>           re-started bus-errors arbit-lost error-warn error-pass bus-off
>           0          112256     0          1          3          1         numtxqueues 1 numrxqueues 1 gso_max_size 65536 gso_max_segs 65535
                       ^^^^^^                ^          ^          ^
>     RX: bytes  packets  errors  dropped missed  mcasta
>     2590649888 773910314 3       0       0       0
>     TX: bytes  packets  errors  dropped carrier collsns
>     3442619696 386944310 112254  12      0       0

Why do you have so many errors on can1? The device event went into bus-off.

> This is the SPI setup for the dual CAN PI:
> 
> dtparam=spi=on
> dtoverlay=spi6-1cs
> # mcp251xfd DTS for RPI4 default CAN on SPI6.0
> dtoverlay=mcp251xfd-spi6-0,interrupt_pin=25,oscillator=40000000
> # mcp251xfd DTS for RPI4 CAN extension on SPI0.0
> dtoverlay=mcp251xfd,spi0-0,interrupt=16,oscillator=40000000
> 
> Or did you mean something else with "script"?

Can you share your "scselftest" program?

> I'll try the register dump when I suffer the next error ;-)

Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
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