atmel_nand: use nand ecc_{strength, step}_ds instead of our own function

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>
Reviewed-by: Andreas Bießmann <andreas.devel@googlemail.com>
Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>

drivers/mtd/nand/atmel_nand.c

@@ -676,34 +676,6 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
 }
 
 #ifdef CONFIG_SYS_NAND_ONFI_DETECTION
-/*
- * get_onfi_ecc_param - Get ECC requirement from ONFI parameters
- * @ecc_bits: store the ONFI ECC correct bits capbility
- * @sector_size: in how many bytes that ONFI require to correct @ecc_bits
- *
- * Returns -1 if ONFI parameters is not supported. In this case @ecc_bits,
- * @sector_size are initialize to 0.
- * 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;
-}
-
 /*
  * pmecc_choose_ecc - Get ecc requirement from ONFI parameters. If
  *                    pmecc_corr_cap or pmecc_sector_size is 0, then set it as
@@ -724,17 +696,15 @@ static int pmecc_choose_ecc(struct atmel_nand_host *host,
 	/* Get ECC requirement from ONFI parameters */
 	*cap = *sector_size = 0;
 	if (chip->onfi_version) {
-		if (!get_onfi_ecc_param(chip, cap, sector_size)) {
-			MTDDEBUG(MTD_DEBUG_LEVEL1, "ONFI params, minimum required 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");
+		*cap = chip->ecc_strength_ds;
+		*sector_size = chip->ecc_step_ds;
+		MTDDEBUG(MTD_DEBUG_LEVEL1, "ONFI params, minimum required ECC: %d bits in %d bytes\n",
+			 *cap, *sector_size);
 	}
+
 	if (*cap == 0 && *sector_size == 0) {
-		/* Non-ONFI compliant or use extended ONFI parameters */
+		/* Non-ONFI compliant */
+		dev_info(host->dev, "NAND chip is not ONFI compliant, assume ecc_bits is 2 in 512 bytes\n");
 		*cap = 2;
 		*sector_size = 512;
 	}