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mtd: rawnand: qcom: use the ecc strength from device parameter 

Currently the driver uses the ECC strength specified in DT.
The QPIC/EBI2 NAND supports 4 or 8-bit ECC correction. The same
kind of board can have different NAND parts so use the ECC
strength from device parameters if it is not specified in DT.

Signed-off-by: Abhishek Sahu <absahu@codeaurora.org>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
This commit is contained in:
Abhishek Sahu 2018-06-20 12:57:32 +05:30 committed by Miquel Raynal
parent 320bdb5fb9
commit 7ddb937f2c
1 changed files with 21 additions and 8 deletions
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29
drivers/mtd/nand/raw/qcom_nandc.c
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@ -2315,19 +2315,39 @@ static const struct mtd_ooblayout_ops qcom_nand_ooblayout_ops = {
.free = qcom_nand_ooblayout_free,
};
static int
qcom_nandc_calc_ecc_bytes(int step_size, int strength)
{
return strength == 4 ? 12 : 16;
}
NAND_ECC_CAPS_SINGLE(qcom_nandc_ecc_caps, qcom_nandc_calc_ecc_bytes,
NANDC_STEP_SIZE, 4, 8);
static int qcom_nand_host_setup(struct qcom_nand_host *host)
{
struct nand_chip *chip = &host->chip;
struct mtd_info *mtd = nand_to_mtd(chip);
struct nand_ecc_ctrl *ecc = &chip->ecc;
struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
int cwperpage, bad_block_byte;
int cwperpage, bad_block_byte, ret;
bool wide_bus;
int ecc_mode = 1;
/* controller only supports 512 bytes data steps */
ecc->size = NANDC_STEP_SIZE;
wide_bus = chip->options & NAND_BUSWIDTH_16 ? true : false;
cwperpage = mtd->writesize / NANDC_STEP_SIZE;
/*
* Each CW has 4 available OOB bytes which will be protected with ECC
* so remaining bytes can be used for ECC.
*/
ret = nand_ecc_choose_conf(chip, &qcom_nandc_ecc_caps,
mtd->oobsize - (cwperpage * 4));
if (ret) {
dev_err(nandc->dev, "No valid ECC settings possible\n");
return ret;
}
if (ecc->strength >= 8) {
/* 8 bit ECC defaults to BCH ECC on all platforms */
@ -2396,7 +2416,6 @@ static int qcom_nand_host_setup(struct qcom_nand_host *host)
mtd_set_ooblayout(mtd, &qcom_nand_ooblayout_ops);
cwperpage = mtd->writesize / ecc->size;
nandc->max_cwperpage = max_t(unsigned int, nandc->max_cwperpage,
cwperpage);
@ -2412,12 +2431,6 @@ static int qcom_nand_host_setup(struct qcom_nand_host *host)
* for 8 bit ECC
*/
host->cw_size = host->cw_data + ecc->bytes;
if (ecc->bytes * (mtd->writesize / ecc->size) > mtd->oobsize) {
dev_err(nandc->dev, "ecc data doesn't fit in OOB area\n");
return -EINVAL;
}
bad_block_byte = mtd->writesize - host->cw_size * (cwperpage - 1) + 1;
host->cfg0 = (cwperpage - 1) << CW_PER_PAGE