Hi Kurt
Am Mi., 23. Sept. 2020 um 21:06 Uhr schrieb Kurt Van Dijck
<dev.kurt@xxxxxxxxxxxxxxxxxxxxxx>:
> > 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).
>
> There is something bizarre with the DMA implementation of imx.
> The variscite device-tree's come with dma disabled in their SPI nodes,
> using
>
> &ecspi1 {
> status = "okay";
> /delete-property/ dmas;
> /delete-property/ dma-names;
> };
>
> Since I was struggling to consume 1Mbit, I tried to enable DMA again,
> and ran into the same SPI tranfer failed. Disabling DMA fixes this.
After adopting my DT I am now able to successfully receive CAN frames
now. Load testing needs to be done....
I also tried with different SDMA firmware versions but that didn't
change anything.
> > Trying to send a CAN-FD frame with baud rate switch fails
> > # cansend can0 123##142
> > [ 190.921477] mcp25xxfd spi1.0 can0: bus-off
This still leads to an immediate bus off. I think I have to get the
scope out to check the reason here.
Thanks,
Matthias
