[U-Boot] [PATCH V2 2/3] mtd: nand: mxs check maximum ecc that platfrom supports

Peng Fan
2015-07-21T08:15:20Z

Check maximum ecc strength for each platfrom to avoid the calculated ecc
exceed the limitation.

Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
Signed-off-by: Han Xu <b45815@freescale.com>
Reviewed-by: Marek Vasut <marex@denx.de>
---

Changes v2:
Add Marek's reviewed by.

drivers/mtd/nand/mxs_nand.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/mxs_nand.c b/drivers/mtd/nand/mxs_nand.c
index 33ce817..97011b2 100644
--- a/drivers/mtd/nand/mxs_nand.c
+++ b/drivers/mtd/nand/mxs_nand.c
@@ -149,6 +149,13 @@ static inline uint32_t mxs_nand_get_ecc_strength(uint32_t page_data_size,
uint32_t page_oob_size)
{
int ecc_strength;
+ int max_ecc_strength_supported;
+
+ /* Refer to Chapter 17 for i.MX6DQ, Chapter 18 for i.MX6SX */
+ if (is_cpu_type(MXC_CPU_MX6SX))
+ max_ecc_strength_supported = 62;
+ else
+ max_ecc_strength_supported = 40;

/*
* Determine the ECC layout with the formula:
@@ -162,7 +169,7 @@ static inline uint32_t mxs_nand_get_ecc_strength(uint32_t page_data_size,
/ (galois_field *
mxs_nand_ecc_chunk_cnt(page_data_size));

- return round_down(ecc_strength, 2);
+ return min(round_down(ecc_strength, 2), max_ecc_strength_supported);
}

static inline uint32_t mxs_nand_get_mark_offset(uint32_t page_data_size,
--
1.8.4