mtd: nand: sunxi: Support ECC maximization
Setup the maximum ECC config when NAND_ECC_MAXIMIZE is set.
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 2032244..8b8470c 100644
--- a/drivers/mtd/nand/sunxi_nand.c
+++ b/drivers/mtd/nand/sunxi_nand.c
@@ -1787,6 +1787,35 @@
int ret;
int i;
+ if (ecc->options & NAND_ECC_MAXIMIZE) {
+ int bytes;
+
+ ecc->size = 1024;
+ nsectors = mtd->writesize / ecc->size;
+
+ /* Reserve 2 bytes for the BBM */
+ bytes = (mtd->oobsize - 2) / nsectors;
+
+ /* 4 non-ECC bytes are added before each ECC bytes section */
+ bytes -= 4;
+
+ /* and bytes has to be even. */
+ if (bytes % 2)
+ bytes--;
+
+ ecc->strength = bytes * 8 / fls(8 * ecc->size);
+
+ for (i = 0; i < ARRAY_SIZE(strengths); i++) {
+ if (strengths[i] > ecc->strength)
+ break;
+ }
+
+ if (!i)
+ ecc->strength = 0;
+ else
+ ecc->strength = strengths[i - 1];
+ }
+
if (ecc->size != 512 && ecc->size != 1024)
return -EINVAL;