On Fri, 20 Jul 2018 17:15:16 +0200
Miquel Raynal <miquel.ray...@bootlin.com> wrote:
> Two helpers have been added to the core to make ECC-related
> configuration between the detection phase and the final NAND scan. Use
> these hooks and convert the driver to just use nand_scan() instead of
> both nand_scan_ident() and nand_scan_tail().
>
> Signed-off-by: Miquel Raynal <miquel.ray...@bootlin.com>
> ---
> drivers/mtd/nand/raw/txx9ndfmc.c | 29 +++++++++++++++--------------
> 1 file changed, 15 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/mtd/nand/raw/txx9ndfmc.c
> b/drivers/mtd/nand/raw/txx9ndfmc.c
> index 9019022774f7..0134beb1136d 100644
> --- a/drivers/mtd/nand/raw/txx9ndfmc.c
> +++ b/drivers/mtd/nand/raw/txx9ndfmc.c
> @@ -254,23 +254,23 @@ static void txx9ndfmc_initialize(struct platform_device
> *dev)
> #define TXX9NDFMC_NS_TO_CYC(gbusclk, ns) \
> DIV_ROUND_UP((ns) * DIV_ROUND_UP(gbusclk, 1000), 1000000)
>
> -static int txx9ndfmc_nand_scan(struct mtd_info *mtd)
> +static int txx9ndfmc_attach_chip(struct nand_chip *chip)
> {
> - struct nand_chip *chip = mtd_to_nand(mtd);
> - int ret;
> + struct mtd_info *mtd = nand_to_mtd(chip);
>
> - ret = nand_scan_ident(mtd, 1, NULL);
> - if (!ret) {
> - if (mtd->writesize >= 512) {
> - /* Hardware ECC 6 byte ECC per 512 Byte data */
> - chip->ecc.size = 512;
> - chip->ecc.bytes = 6;
> - }
> - ret = nand_scan_tail(mtd);
> + if (mtd->writesize >= 512) {
> + /* Hardware ECC 6 byte ECC per 512 Byte data */
> + chip->ecc.size = 512;
> + chip->ecc.bytes = 6;
> }
> - return ret;
> +
> + return 0;
> }
>
> +static const struct nand_controller_ops txx9ndfmc_controller_ops = {
> + .attach_chip = txx9ndfmc_attach_chip,
> +};
> +
> static int __init txx9ndfmc_probe(struct platform_device *dev)
> {
> struct txx9ndfmc_platform_data *plat = dev_get_platdata(&dev->dev);
> @@ -304,6 +304,7 @@ static int __init txx9ndfmc_probe(struct platform_device
> *dev)
> (gbusclk + 500000) / 1000000, hold, spw);
>
> nand_controller_init(&drvdata->controller);
> + drvdata->controller.ops = &txx9ndfmc_controller_ops;
>
> platform_set_drvdata(dev, drvdata);
> txx9ndfmc_initialize(dev);
> @@ -332,7 +333,7 @@ static int __init txx9ndfmc_probe(struct platform_device
> *dev)
> chip->ecc.correct = txx9ndfmc_correct_data;
> chip->ecc.hwctl = txx9ndfmc_enable_hwecc;
> chip->ecc.mode = NAND_ECC_HW;
> - /* txx9ndfmc_nand_scan will overwrite ecc.size and ecc.bytes */
> + /* nand_scan() will overwrite ecc.size and ecc.bytes */
> chip->ecc.size = 256;
> chip->ecc.bytes = 3;
I had a hard time understanding what was the point of assigning
values that would later be overwritten. Actually the comment is
inaccurate, it's only overwritten if mtd->writesize >= 512. Can you had
a patch that moves this block in txx9ndfmc_nand_scan() before doing the
->attach_chip() conversion?
> chip->ecc.strength = 1;
> @@ -359,7 +360,7 @@ static int __init txx9ndfmc_probe(struct platform_device
> *dev)
> if (plat->wide_mask & (1 << i))
> chip->options |= NAND_BUSWIDTH_16;
>
> - if (txx9ndfmc_nand_scan(mtd)) {
> + if (nand_scan(mtd, 1)) {
> kfree(txx9_priv->mtdname);
> kfree(txx9_priv);
> continue;
