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Commit 4796d865 authored by Boris Brezillon's avatar Boris Brezillon
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mtd: nand: sunxi: Support ECC maximization 



Setup the maximum ECC config when NAND_ECC_MAXIMIZE is set.

Signed-off-by: default avatarBoris Brezillon <boris.brezillon@free-electrons.com>
parent 8bbba481

drivers/mtd/nand/sunxi_nand.c

+29 −0
Original line number Diff line number Diff line
@@ -1787,6 +1787,35 @@ static int sunxi_nand_hw_common_ecc_ctrl_init(struct mtd_info *mtd, 
	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;