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mtd: rawnand: micron: Avoid enabling/disabling ECC when it can't be disabled 

Some chips have their on-die ECC forcibly enabled, there's no point in
trying to enable/disable the ECC engine in that case.

Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Tested-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
This commit is contained in:
Boris Brezillon 2018-07-18 10:42:20 +02:00 committed by Miquel Raynal
parent 2301780711
commit ef422e1ecd
1 changed files with 8 additions and 0 deletions
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8
drivers/mtd/nand/raw/nand_micron.c
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@ -65,6 +65,7 @@ struct nand_onfi_vendor_micron {
} __packed;
struct micron_on_die_ecc {
bool forced;
void *rawbuf;
};
@ -171,8 +172,12 @@ static const struct mtd_ooblayout_ops micron_nand_on_die_8_ooblayout_ops = {
static int micron_nand_on_die_ecc_setup(struct nand_chip *chip, bool enable)
{
struct micron_nand *micron = nand_get_manufacturer_data(chip);
u8 feature[ONFI_SUBFEATURE_PARAM_LEN] = { 0, };
if (micron->ecc.forced)
return 0;
if (enable)
feature[0] |= ONFI_FEATURE_ON_DIE_ECC_EN;
@ -452,6 +457,9 @@ static int micron_nand_init(struct nand_chip *chip)
goto err_free_manuf_data;
}
if (ondie == MICRON_ON_DIE_MANDATORY)
micron->ecc.forced = true;
/*
* In case of 4bit on-die ECC, we need a buffer to store a
* page dumped in raw mode so that we can compare its content