mtd: spi-nor: Allow flashes to specify MTD writesize

Some flashes like the Infineon SEMPER NOR flash family use ECC. Under
this ECC scheme, multi-pass writes to an ECC block is not allowed.
In other words, once data is programmed to an ECC block, it can't be
programmed again without erasing it first.

Upper layers like file systems need to be given this information so they
do not cause error conditions on the flash by attempting multi-pass
programming. This can be done by setting 'writesize' in 'struct
mtd_info'.

Set the default to 1 but allow flashes to modify it in fixup hooks. If
more flashes show up with this constraint in the future it might be
worth it to add it to 'struct flash_info', but for now increasing its
size is not worth it.

This patch replicates the following upstream linux commit:
afd473e85827 ("mtd: spi-nor: core: Allow flashes to specify MTD writesize")

Acked-by: Tudor Ambarus <tudor.ambarus@linaro.org>
Signed-off-by: Takahiro Kuwano <Takahiro.Kuwano@infineon.com>

This commit is contained in:

Takahiro Kuwano

2024-10-15 08:57:49 -06:00

committed by

Tom Rini

parent 6d7a8bf8c0

commit 88057dab2c

2 changed files with 3 additions and 1 deletions

									
										include/linux/mtd/spi-nor.h
									
		+1
		
												View File
												
				@@ -457,6 +457,7 @@ enum spi_nor_pp_command_index {

				struct spi_nor_flash_parameter {

					u64				size;

					u32				writesize;

					u32				page_size;

					u8				rdsr_dummy;

					u8				rdsr_addr_nbytes;