Hi
I currently try to get a MCP2518FD to work on our custom iMX6ULL based
hardware. I use the driver currently in linux-can-next backported to
our v5.4 kernel
DT:
can0: can@0 {
compatible = "microchip,mcp25xxfd";
reg = <0>;
clocks = <&can3_osc>;
spi-max-frequency = <85000000>;
interrupts-extended = <&gpio1 18 IRQ_TYPE_LEVEL_LOW>;
status = "okay";
};
# dmesg | grep mcp
[ 3.706085] mcp25xxfd spi1.0 can0: MCP2518FD rev0.0 (-RX_INT
-MAB_NO_WARN +CRC_REG +CRC_RX +CRC_TX +ECC -HD c:20.00MHz m:8.50MHz
r:8.50MHz e:0.00MHz) successfully initialized.
I then up the CAN interface
# ip link set can0 up type can bitrate 125000 sample-point 0.75
dbitrate 500000 dsample-point 0.8 fd on
I am then able to send CAN frames using
# cansend can0 123#42
and CAN-FD frames using
# cansend can0 123##042
These frames are successfully received on a connected PC using an PCAN-USB FD
Trying to send a CAN-FD frame with baud rate switch fails
# cansend can0 123##142
[ 190.921477] mcp25xxfd spi1.0 can0: bus-off
Also receiving of any CAN frame doesn't work
# candump any,0:0,#FFFFFFFF
[ 259.937612] spi_master spi1: I/O Error in DMA RX
[ 259.943743] mcp25xxfd spi1.0: SPI transfer failed: -110
[ 259.949644] spi_master spi1: failed to transfer one message from queue
[ 259.956566] mcp25xxfd spi1.0 can0: IRQ handler
mcp25xxfd_handle_rxif() returned -110.
[ 259.964547] mcp25xxfd spi1.0 can0: IRQ handler returned -110
(intf=0x3f1a0002).
My first thought was that the interrupts of the controller are not
recognized by the iMX but /proc/interrupts shows that there are some
of them
78: 10 gpio-mxc 18 Level spi1.0
Any hints are greatly appreciated
Regards
Matthias
