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Subject[RFC 37/47] mtd: nand: stm_nand_bch: fetch the bit-flips threshold
Date
If none is provided by the platform, the default ECC mode will be used.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
drivers/mtd/nand/stm_nand_bch.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)

diff --git a/drivers/mtd/nand/stm_nand_bch.c b/drivers/mtd/nand/stm_nand_bch.c
index a0f0ae2..3853e7a 100644
--- a/drivers/mtd/nand/stm_nand_bch.c
+++ b/drivers/mtd/nand/stm_nand_bch.c
@@ -44,6 +44,12 @@ static int bch_ecc_sizes[] = {
[BCH_NO_ECC] = 0,
};

+static int bch_ecc_strength[] = {
+ [BCH_18BIT_ECC] = 18,
+ [BCH_30BIT_ECC] = 30,
+ [BCH_NO_ECC] = 0,
+};
+
/*
* Inband Bad Block Table (IBBT)
*/
@@ -1843,6 +1849,21 @@ static int stm_nand_bch_probe(struct platform_device *pdev)
info->ecclayout.eccbytes =
nandi->sectors_per_page * bch_ecc_sizes[nandi->bch_ecc_mode];

+ /*
+ * Get bit-flips threshold. A value of '0' is interpreted as
+ * <ecc_strength>.
+ */
+ if (pdata->bch_bitflip_threshold) {
+ nandi->bitflip_threshold = pdata->bch_bitflip_threshold;
+ } else {
+ dev_warn(nandi->dev,
+ "WARNING: bit-flips threshold not specified.\n"
+ " Defaulting to ECC strength [%d]\n",
+ bch_ecc_strength[nandi->bch_ecc_mode]);
+ nandi->bitflip_threshold =
+ bch_ecc_strength[nandi->bch_ecc_mode];
+ }
+
compatible = bch_check_compatibility(nandi, mtd, chip);
if (!compatible) {
dev_err(nandi->dev,
--
1.8.3.2


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