[PATCH 4/4] mtd: spi-nor: Set ECC unit size to MTD writesize in Infineon SEMPER flashes

[tkuw584924 at gmail.com]

From: Takahiro Kuwano <Takahiro.Kuwano at infineon.com>

The Infineon SEMPER NOR flash family uses 2-bit ECC by default with each
ECC block being 16 bytes. Under this scheme multi-pass programming to an
ECC block is not allowed. Set the writesize to make sure multi-pass
programming is not attempted on the flash.

Signed-off-by: Takahiro Kuwano <Takahiro.Kuwano at infineon.com>
---
 drivers/mtd/spi/spi-nor-core.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/mtd/spi/spi-nor-core.c b/drivers/mtd/spi/spi-nor-core.c
index 8f371a5213..773afd4040 100644
--- a/drivers/mtd/spi/spi-nor-core.c
+++ b/drivers/mtd/spi/spi-nor-core.c
@@ -3459,6 +3459,13 @@ static void s25_default_init(struct spi_nor *nor,
 			     struct spi_nor_flash_parameter *params)
 {
 	nor->setup = s25_s28_setup;
+
+	/*
+	 * Programming is supported only in 16-byte ECC data unit granularity.
+	 * Byte-programming, bit-walking, or multiple program operations to the
+	 * same ECC data unit without an erase are not allowed.
+	 */
+	params->writesize = 16;
 }
 
 static int s25_s28_post_bfpt_fixup(struct spi_nor *nor,
@@ -3623,6 +3630,13 @@ static void s28hx_t_default_init(struct spi_nor *nor,
 {
 	nor->octal_dtr_enable = spi_nor_cypress_octal_dtr_enable;
 	nor->setup = s25_s28_setup;
+
+	/*
+	 * Programming is supported only in 16-byte ECC data unit granularity.
+	 * Byte-programming, bit-walking, or multiple program operations to the
+	 * same ECC data unit without an erase are not allowed.
+	 */
+	params->writesize = 16;
 }
 
 static void s28hx_t_post_sfdp_fixup(struct spi_nor *nor,
-- 
2.34.1