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| author | Aaron Sierra <asierra@xes-inc.com> | 2015-01-14 17:41:31 -0600 |
|---|---|---|
| committer | Brian Norris <computersforpeace@gmail.com> | 2015-02-01 21:10:58 -0800 |
| commit | e0377cdebaf3913bff693c9eea17ff6eb4d7abc8 (patch) | |
| tree | 4af65d7984f566492e043f4376757fbcf726c03d /drivers/mtd | |
| parent | 240181fd0ffa69cac08d6b06c94e843707370f5f (diff) | |
| download | linux-e0377cdebaf3913bff693c9eea17ff6eb4d7abc8.tar.gz linux-e0377cdebaf3913bff693c9eea17ff6eb4d7abc8.tar.bz2 linux-e0377cdebaf3913bff693c9eea17ff6eb4d7abc8.zip | |
mtd: nand: Request strength instead of bytes for soft BCH
Previously, we requested that drivers pass ecc.size and ecc.bytes when
using NAND_ECC_SOFT_BCH. However, a driver is likely to only know the ECC
strength required for its NAND, so each driver would need to perform a
strength-to-bytes calculation.
Avoid duplicating this calculation in each driver by asking drivers to
pass ecc.size and ecc.strength so that the strength-to-bytes calculation
need only be implemented once.
This reverts/generalizes this commit:
mtd: nand: Base BCH ECC bytes on required strength
Signed-off-by: Aaron Sierra <asierra@xes-inc.com>
Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/nand/nand_base.c | 14 | ||||
| -rw-r--r-- | drivers/mtd/nand/nandsim.c | 1 | ||||
| -rw-r--r-- | drivers/mtd/nand/sunxi_nand.c | 2 |
3 files changed, 9 insertions, 8 deletions
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index 3f24b587304f..f6af96926f00 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -4037,22 +4037,24 @@ int nand_scan_tail(struct mtd_info *mtd) ecc->read_oob = nand_read_oob_std; ecc->write_oob = nand_write_oob_std; /* - * Board driver should supply ecc.size and ecc.bytes values to - * select how many bits are correctable; see nand_bch_init() - * for details. Otherwise, default to 4 bits for large page - * devices. + * Board driver should supply ecc.size and ecc.strength values + * to select how many bits are correctable. Otherwise, default + * to 4 bits for large page devices. */ if (!ecc->size && (mtd->oobsize >= 64)) { ecc->size = 512; - ecc->bytes = DIV_ROUND_UP(13 * ecc->strength, 8); + ecc->strength = 4; } + + /* See nand_bch_init() for details. */ + ecc->bytes = DIV_ROUND_UP( + ecc->strength * fls(8 * ecc->size), 8); ecc->priv = nand_bch_init(mtd, ecc->size, ecc->bytes, &ecc->layout); if (!ecc->priv) { pr_warn("BCH ECC initialization failed!\n"); BUG(); } - ecc->strength = ecc->bytes * 8 / fls(8 * ecc->size); break; case NAND_ECC_NONE: diff --git a/drivers/mtd/nand/nandsim.c b/drivers/mtd/nand/nandsim.c index a8fa8dad9b23..f2324271b94e 100644 --- a/drivers/mtd/nand/nandsim.c +++ b/drivers/mtd/nand/nandsim.c @@ -2337,6 +2337,7 @@ static int __init ns_init_module(void) } chip->ecc.mode = NAND_ECC_SOFT_BCH; chip->ecc.size = 512; + chip->ecc.strength = bch; chip->ecc.bytes = eccbytes; NS_INFO("using %u-bit/%u bytes BCH ECC\n", bch, chip->ecc.size); } diff --git a/drivers/mtd/nand/sunxi_nand.c b/drivers/mtd/nand/sunxi_nand.c index ccaa8e283388..6f93b2990d25 100644 --- a/drivers/mtd/nand/sunxi_nand.c +++ b/drivers/mtd/nand/sunxi_nand.c @@ -1110,8 +1110,6 @@ static int sunxi_nand_ecc_init(struct mtd_info *mtd, struct nand_ecc_ctrl *ecc, switch (ecc->mode) { case NAND_ECC_SOFT_BCH: - ecc->bytes = DIV_ROUND_UP(ecc->strength * fls(8 * ecc->size), - 8); break; case NAND_ECC_HW: ret = sunxi_nand_hw_ecc_ctrl_init(mtd, ecc, np); |