Linux commit 60c673824561.
Signed-off-by: Ladislav Michl <ladis@xxxxxxxxxxxxxx>
---
drivers/mtd/nand/nand_base.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 9b2d3f1cf..e290081bb 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -3219,6 +3219,20 @@ static void nand_decode_ext_id(struct mtd_info *mtd, struct nand_chip *chip,
extid >>= 2;
/* Get buswidth information */
*busw = (extid & 0x01) ? NAND_BUSWIDTH_16 : 0;
+ /*
+ * Toshiba 24nm raw SLC (i.e., not BENAND) have 32B OOB per
+ * 512B page. For Toshiba SLC, we decode the 5th/6th byte as
+ * follows:
+ * - ID byte 6, bits[2:0]: 100b -> 43nm, 101b -> 32nm,
+ * 110b -> 24nm
+ * - ID byte 5, bit[7]: 1 -> BENAND, 0 -> raw SLC
+ */
+ if (id_len >= 6 && id_data[0] == NAND_MFR_TOSHIBA &&
+ nand_is_slc(chip) &&
+ (id_data[5] & 0x7) == 0x6 /* 24nm */ &&
+ !(id_data[4] & 0x80) /* !BENAND */) {
+ mtd->oobsize = 32 * mtd->writesize >> 9;
+ }
}
}
--
2.19.1
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