Hi,
Could you please backport the three following commits to 4.14 and 4.19:
24c363623361 ("spi: spi-fsl-spi: remove always-true conditional in fsl_spi_do_one_msg") 17ecffa28948 ("spi: spi-fsl-spi: relax message sanity checking a little") a798a7086c38 ("spi: spi-fsl-spi: allow changing bits_per_word while CS is still active")
Those three commits (the last one indeed) are needed to overcome a problem introduced in 4.14.230 by commit 42c04316d927 ("spi: fsl-cpm: Use 16 bit mode for large transfers with even size"), which leads to the following error in certain cases:
[ 174.900526] at25 spi0.3: bits_per_word/speed_hz should be same for the same SPI transfer [ 174.911844] spi_master spi0: failed to transfer one message from queue [ 366.639467] INFO: task od:406 blocked for more than 120 seconds. [ 366.645155] Not tainted 4.14.320-s3k-dev-dirty #342 [ 366.652996] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 489.519450] INFO: task od:406 blocked for more than 120 seconds. [ 489.525156] Not tainted 4.14.320-s3k-dev-dirty #342 [ 489.532915] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. ...
Thanks Christophe