Hello,
In addition to c20c57d9868d ("spi: fsl-spi: Fix CPM/QE mode Litte Endian") that you already applied to all stable branches, could you please also apply:
8a5299a1278e ("spi: fsl-spi: Re-organise transfer bits_per_word adaptation") fc96ec826bce ("spi: fsl-cpm: Use 16 bit mode for large transfers with even size")
For 4.14 and 4.19, as prerequisit you will also need
af0e6242909c ("spi: spi-fsl-spi: automatically adapt bits-per-word in cpu mode")
Thanks Christophe