On Thu, 6 Sep 2018 10:49:22 +0200 Marcel Ziswiler <mar...@ziswiler.com> wrote:
> From: Marcel Ziswiler <marcel.ziswi...@toradex.com> > > This patch enables support to read the ECC level from the NAND flash > using ESMT SLC NAND ID byte 5 information as documented e.g. in the > following data sheet: > > https://www.esmt.com.tw/upload/pdf/ESMT/datasheets/F59L1G81LA(2Y).pdf > > Signed-off-by: Marcel Ziswiler <marcel.ziswi...@toradex.com> > > --- > > drivers/mtd/nand/raw/nand_esmt.c | 46 > ++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 46 insertions(+) > create mode 100644 drivers/mtd/nand/raw/nand_esmt.c > > diff --git a/drivers/mtd/nand/raw/nand_esmt.c > b/drivers/mtd/nand/raw/nand_esmt.c > new file mode 100644 > index 000000000000..360d351ac043 > --- /dev/null > +++ b/drivers/mtd/nand/raw/nand_esmt.c > @@ -0,0 +1,46 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Copyright (C) 2018 Toradex AG > + * > + * Author: Marcel Ziswiler <marcel.ziswi...@toradex.com> > + */ > + > +#include <linux/mtd/rawnand.h> > + > +static void esmt_nand_decode_id(struct nand_chip *chip) > +{ > + nand_decode_ext_id(chip); > + > + /* Extract ECC requirements from 5th id byte. */ > + if (chip->id.len >= 5 && nand_is_slc(chip)) { > + chip->ecc_step_ds = 512; > + switch (chip->id.data[4] & 0x3) { > + case 0x0: > + chip->ecc_strength_ds = 4; > + break; > + case 0x1: > + chip->ecc_strength_ds = 2; > + break; > + case 0x2: > + chip->ecc_strength_ds = 1; > + break; > + default: > + WARN(1, "Could not get ECC info"); > + chip->ecc_step_ds = 0; > + break; > + } > + } > +} > + > +static int esmt_nand_init(struct nand_chip *chip) > +{ > + if (nand_is_slc(chip)) > + chip->bbt_options |= NAND_BBT_SCAN2NDPAGE; > + > + return 0; > +} > + > +const struct nand_manufacturer_ops esmt_nand_manuf_ops = { > + .detect = esmt_nand_decode_id, > + .init = esmt_nand_init, > +}; Looks like you forgot to hook the new esmt_nand_manuf_ops to the ESMT entry (in the nand_manufacturer table), so as is, the patch is not exactly adding support for ECC req parsing ;-).
