Could you run below command to check if it pass or failed.
sudo ./spidev_test -D /dev/spidev3.0 -s4000000 -g16 -n10
The binary from below link
Could you run below command to check if it pass or failed.
sudo ./spidev_test -D /dev/spidev3.0 -s4000000 -g16 -n10
The binary from below link