On some NAND chips the driver uses a ECC size that is not dividable by
the number of chunks per page which means a single chunk cannot be read.
Disable the subpage feature for these NANDs. This is quite unfortunate
since the subpage feature really speeds up scanning NAND chips.
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
drivers/mtd/nand/nand_mxs.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/mtd/nand/nand_mxs.c b/drivers/mtd/nand/nand_mxs.c
index a9c6e96..fd4e209 100644
--- a/drivers/mtd/nand/nand_mxs.c
+++ b/drivers/mtd/nand/nand_mxs.c
@@ -1392,14 +1392,16 @@ static int mxs_nand_probe(struct device_d *dev)
nand->ecc.size = 512;
nand->ecc.strength = 8;
- nand->ecc.read_subpage = gpmi_ecc_read_subpage;
- nand->options |= NAND_SUBPAGE_READ;
-
/* first scan to find the device and get the page size */
err = nand_scan_ident(mtd, 4, NULL);
if (err)
goto err2;
+ if ((13 * mxs_nand_get_ecc_strength(mtd->writesize, mtd->oobsize) % 8) == 0) {
+ nand->ecc.read_subpage = gpmi_ecc_read_subpage;
+ nand->options |= NAND_SUBPAGE_READ;
+ }
+
nand->options |= NAND_NO_SUBPAGE_WRITE;
/* second phase scan */
--
2.8.1
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