I've tested and found WREN is not needed, so we should change the chip definition for 1.3. Here is a patch to update the chip definition: https://review.coreboot.org/c/flashrom/+/70342Nikolai Artemiev
IIUC, the comment is about whether enter 4BA command is permitted after a WREN command. The "CS# goes low -> sending Enter 4-Byte mode command -> CS# goes high." part of the datasheet seems to just be describing the a minimal transact...Nikolai Artemiev