In our imx6ul based custom board, we are using the spi-uart bridge expander (max4830).
I am able to probe on the spi bus.
but in the kernel logs, received logs like,
spi_mx_200c000.ecspi:dma setup error -19, use pio
on MAX14830 expander, able to read revision id of the chip.and able to open the ports (/dev/ttyMAX0, /dev/ttyMAX1)
I am doing the loopback test, reception of the data getting correctly. But after some time ( say 3 -4 min) ports becomes hang or communiaction stops. If we exit from the port and restart the same port again,then no communication happend.
After reboot of the board and communication happens but for littel time.
Doesnot understand the problem ?
(spi_mx_200c000.ecspi:dma setup error -19, use pio) what is this error
what could be the problem in such issue of stop communication after some time.
(I have checked this on the kernel 4.1.15 and 4.9 also on both kernel same observation.)
Thanks in advance !!!