AM3351: CAN controller RX buffer overflow

Hi Expert,

I found an issue about dual CAN interface on Draco. The situation like below:

• Dual CAN interface work at the same time.  The CPU info like below:

root@fs360d-xc720:~# cat /proc/cpuinfo

processor       : 0

model name      : ARMv7 Processor rev 2 (v7l)

BogoMIPS        : 597.60

Features        : half thumb fastmult vfp edsp thumbee neon vfpv3 tls vfpd32

CPU implementer : 0x41

CPU architecture: 7

CPU variant     : 0x3

CPU part        : 0xc08

CPU revision    : 2

Hardware        : Generic AM33XX (Flattened Device Tree)

Revision        : 0000

Serial          : 0000000000000000

• CAN interface parameter like below:

root@fs360d-xc720:~# ip -s -d link show can0

2: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UP mode DEFAULT group default qlen 10

    link/can  promiscuity 0 minmtu 0 maxmtu 0

    can state ERROR-ACTIVE (berr-counter tx 0 rx 0) restart-ms 0

          bitrate 500000 sample-point 0.812

          tq 125 prop-seg 6 phase-seg1 6 phase-seg2 3 sjw 3 brp 3

          c_can: tseg1 2..16 tseg2 1..8 sjw 1..4 brp 1..1024 brp_inc 1

          clock 24000000

          re-started bus-errors arbit-lost error-warn error-pass bus-off

          0          0          0          1          0          0         numtxqueues 1 gso_max_size 65536 gso_max_segs 65535

    RX:  bytes packets errors dropped  missed   mcast

         21385    2681      0       0       0       0

    TX:  bytes packets errors dropped carrier collsns

          4753     681      0       0       0       0

root@fs360d-xc720:~# ip -s -d link show can1

3: can1: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UP mode DEFAULT group default qlen 10

    link/can  promiscuity 0 minmtu 0 maxmtu 0

    can state ERROR-ACTIVE (berr-counter tx 0 rx 59) restart-ms 0

          bitrate 500000 sample-point 0.812

          tq 125 prop-seg 6 phase-seg1 6 phase-seg2 3 sjw 3 brp 3

          c_can: tseg1 2..16 tseg2 1..8 sjw 1..4 brp 1..1024 brp_inc 1

          clock 24000000

          re-started bus-errors arbit-lost error-warn error-pass bus-off

          0          0          0          1          0          0         numtxqueues 1 gso_max_size 65536 gso_max_segs 65535

    RX:  bytes packets errors dropped  missed   mcast

           487      70      0       0       0       0

    TX:  bytes packets errors dropped carrier collsns

            49       7      0       0       0       0

• Dual CAN bus receiving can frame continuously, the CAN network topology shown like below:

• On DRACO1 MPU, can message indicates CAN controller RX buffer overflow.

can_frame.can_id & CAN_ERR_FLAG != 0                                            //can.h

can_frame.data[1] & CAN_ERR_CRTL_RX_OVERFLOW != 0              //error.h

Question:

Is there any approach we can apply to eliminate this issue, like adjust parameters or patch?

BR,

Biao