Hi, Takahiro!
On 4/15/24 05:33, tkuw584924@gmail.com wrote:
From: Takahiro Kuwano Takahiro.Kuwano@infineon.com
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.
Signed-off-by: Takahiro Kuwano Takahiro.Kuwano@infineon.com
Please specify when a patch follows linux upstream. This follows the following upstream linux commit:
afd473e85827 ("mtd: spi-nor: core: Allow flashes to specify MTD writesize")
Acked-by: Tudor Ambarus tudor.ambarus@linaro.org