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authorBoris Brezillon <boris.brezillon@free-electrons.com>2016-06-08 17:04:23 +0200
committerBoris Brezillon <boris.brezillon@free-electrons.com>2016-09-23 09:35:16 +0200
commit8bbba48124f2ace8f8bf382539d7115f0f307eeb (patch)
treeae1b7cff469a712a908d550cfec391e169d70296 /drivers/mtd
parentba78ee00e1ff84de9b3ad33edbd3ec599099ee82 (diff)
mtd: nand: Support maximizing ECC when using software BCH
Add support for ECC maximization when software BCH with nand_ooblayout_lp_ops layout is used. Other cases should be handled by the NAND controller driver. Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/nand/nand_base.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 6669dfcf9e79..a74d9e4bd8b2 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -4396,6 +4396,7 @@ static int nand_set_ecc_soft_ops(struct mtd_info *mtd)
ecc->write_page_raw = nand_write_page_raw;
ecc->read_oob = nand_read_oob_std;
ecc->write_oob = nand_write_oob_std;
+
/*
* Board driver should supply ecc.size and ecc.strength
* values to select how many bits are correctable.
@@ -4418,6 +4419,25 @@ static int nand_set_ecc_soft_ops(struct mtd_info *mtd)
}
mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
+
+ }
+
+ /*
+ * We can only maximize ECC config when the default layout is
+ * used, otherwise we don't know how many bytes can really be
+ * used.
+ */
+ if (mtd->ooblayout == &nand_ooblayout_lp_ops &&
+ ecc->options & NAND_ECC_MAXIMIZE) {
+ int steps, bytes;
+
+ /* Always prefer 1k blocks over 512bytes ones */
+ ecc->size = 1024;
+ steps = mtd->writesize / ecc->size;
+
+ /* Reserve 2 bytes for the BBM */
+ bytes = (mtd->oobsize - 2) / steps;
+ ecc->strength = bytes * 8 / fls(8 * ecc->size);
}
/* See nand_bch_init() for details. */