mtd: nand: sunxi: prefer 1k ECC blocks when applicable

Switching to 1k ECC blocks when possible provides better resistance against
concentrated bitflips. Say you have those two configurations:

1/ 16bits/512bytes
2/ 32bits/1024bytes

Both of them require the same amount of ECC bytes (only true for this
specific engine), but the second config allows you to correct the case
where most of your bitflips are concentrated in a single 512bytes portion.

This fact makes the 1k ECC block size more advantageous than the 512bytes
one.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>

diff --git a/drivers/mtd/nand/sunxi_nand.c b/drivers/mtd/nand/sunxi_nand.c
index b9a2e5d2875434affd133a01a2e8afb1235bb620..bb440b91096f372bddd5124b4010ed8647d168e6 100644 (file)
--- a/drivers/mtd/nand/sunxi_nand.c
+++ b/drivers/mtd/nand/sunxi_nand.c
@@ -1786,6 +1786,12 @@ static int sunxi_nand_hw_common_ecc_ctrl_init(struct mtd_info *mtd,
        if (!data)
                return -ENOMEM;
 
+       /* Prefer 1k ECC chunk over 512 ones */
+       if (ecc->size == 512 && mtd->writesize > 512) {
+               ecc->size = 1024;
+               ecc->strength *= 2;
+       }
+
        /* Add ECC info retrieval from DT */
        for (i = 0; i < ARRAY_SIZE(strengths); i++) {
                if (ecc->strength <= strengths[i])