mtd: atmel_nand: use minimum ecc requirements of nand: ecc_{strength,step}_ds

Since ecc_{strength,step}_ds is introduced in nand_chip structure for
minimum ecc requirements. So we can use them directly and remove our
own get_onfi_ecc_param function.

Signed-off-by: Josh Wu <josh.wu@atmel.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
index 5a5d4572585c542d9249302db42f7c1071bfceaf..ef9c9f547c01fffe391235e3a6d9dffe95944321 100644 (file)
--- a/drivers/mtd/nand/atmel_nand.c
+++ b/drivers/mtd/nand/atmel_nand.c
@@ -1062,56 +1062,28 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
 }
 
 /*
- * Get ECC requirement in ONFI parameters, returns -1 if ONFI
- * parameters is not supported.
- * return 0 if success to get the ECC requirement.
- */
-static int get_onfi_ecc_param(struct nand_chip *chip,
-               int *ecc_bits, int *sector_size)
-{
-       *ecc_bits = *sector_size = 0;
-
-       if (chip->onfi_params.ecc_bits == 0xff)
-               /* TODO: the sector_size and ecc_bits need to be find in
-                * extended ecc parameter, currently we don't support it.
-                */
-               return -1;
-
-       *ecc_bits = chip->onfi_params.ecc_bits;
-
-       /* The default sector size (ecc codeword size) is 512 */
-       *sector_size = 512;
-
-       return 0;
-}
-
-/*
- * Get ecc requirement from ONFI parameters ecc requirement.
+ * Get minimum ecc requirements from NAND.
  * If pmecc-cap, pmecc-sector-size in DTS are not specified, this function
- * will set them according to ONFI ecc requirement. Otherwise, use the
+ * will set them according to minimum ecc requirement. Otherwise, use the
  * value in DTS file.
  * return 0 if success. otherwise return error code.
  */
 static int pmecc_choose_ecc(struct atmel_nand_host *host,
                int *cap, int *sector_size)
 {
-       /* Get ECC requirement from ONFI parameters */
-       *cap = *sector_size = 0;
-       if (host->nand_chip.onfi_version) {
-               if (!get_onfi_ecc_param(&host->nand_chip, cap, sector_size))
-                       dev_info(host->dev, "ONFI params, minimum required ECC: %d bits in %d bytes\n",
+       /* Get minimum ECC requirements */
+       if (host->nand_chip.ecc_strength_ds) {
+               *cap = host->nand_chip.ecc_strength_ds;
+               *sector_size = host->nand_chip.ecc_step_ds;
+               dev_info(host->dev, "minimum ECC: %d bits in %d bytes\n",
                                *cap, *sector_size);
-               else
-                       dev_info(host->dev, "NAND chip ECC reqirement is in Extended ONFI parameter, we don't support yet.\n");
        } else {
-               dev_info(host->dev, "NAND chip is not ONFI compliant, assume ecc_bits is 2 in 512 bytes");
-       }
-       if (*cap == 0 && *sector_size == 0) {
                *cap = 2;
                *sector_size = 512;
+               dev_info(host->dev, "can't detect min. ECC, assume 2 bits in 512 bytes\n");
        }
 
-       /* If dts file doesn't specify then use the one in ONFI parameters */
+       /* If device tree doesn't specify, use NAND's minimum ECC parameters */
        if (host->pmecc_corr_cap == 0) {
                /* use the most fitable ecc bits (the near bigger one ) */
                if (*cap <= 2)