On Mon, 2020-02-17 at 06:56:39 UTC, Mason Yang wrote: > Macronix NANDs support randomizer operation for user data scrambled, > which can be enabled with a SET_FEATURE. > > User data written to the NAND device without randomizer is still readable > after randomizer function enabled. > The penalty of randomizer are subpage accesses prohibited and more time > period is needed in program operation and entering deep power-down mode. > i.e., tPROG 300us to 340us(randomizer enabled) > > For more high-reliability concern, if subpage write not available with > hardware ECC and then to enable randomizer is recommended by default. > Driver checks byte 167 of Vendor Blocks in ONFI parameter page table > to see if this high-reliability function is supported. By adding a new > specific DT property in children nodes to enable randomizer function. > > Signed-off-by: Mason Yang <masonccyang@xxxxxxxxxxx> > Reviewed-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx> Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git nand/next, thanks. Miquel
