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SubjectRe: [PATCH v4 26/35] mtd: rawnand: atmel: convert driver to nand_scan()
On Fri, 20 Jul 2018 17:15:18 +0200
Miquel Raynal <miquel.raynal@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.raynal@bootlin.com>
> ---
> drivers/mtd/nand/raw/atmel/nand-controller.c | 83 ++++++++++++++--------------
> 1 file changed, 40 insertions(+), 43 deletions(-)
>
> diff --git a/drivers/mtd/nand/raw/atmel/nand-controller.c b/drivers/mtd/nand/raw/atmel/nand-controller.c
> index 855cc7729c43..0bc7e2abc885 100644
> --- a/drivers/mtd/nand/raw/atmel/nand-controller.c
> +++ b/drivers/mtd/nand/raw/atmel/nand-controller.c
> @@ -202,7 +202,7 @@ struct atmel_nand_controller_ops {
> int (*remove)(struct atmel_nand_controller *nc);
> void (*nand_init)(struct atmel_nand_controller *nc,
> struct atmel_nand *nand);
> - int (*ecc_init)(struct atmel_nand *nand);
> + int (*ecc_init)(struct nand_chip *chip);
> int (*setup_data_interface)(struct atmel_nand *nand, int csline,
> const struct nand_data_interface *conf);
> };
> @@ -1133,9 +1133,8 @@ static int atmel_nand_pmecc_init(struct nand_chip *chip)
> return 0;
> }
>
> -static int atmel_nand_ecc_init(struct atmel_nand *nand)
> +static int atmel_nand_ecc_init(struct nand_chip *chip)
> {
> - struct nand_chip *chip = &nand->base;
> struct atmel_nand_controller *nc;
> int ret;
>
> @@ -1170,12 +1169,11 @@ static int atmel_nand_ecc_init(struct atmel_nand *nand)
> return 0;
> }
>
> -static int atmel_hsmc_nand_ecc_init(struct atmel_nand *nand)
> +static int atmel_hsmc_nand_ecc_init(struct nand_chip *chip)
> {
> - struct nand_chip *chip = &nand->base;
> int ret;
>
> - ret = atmel_nand_ecc_init(nand);
> + ret = atmel_nand_ecc_init(chip);
> if (ret)
> return ret;
>
> @@ -1558,22 +1556,6 @@ static void atmel_hsmc_nand_init(struct atmel_nand_controller *nc,
> chip->select_chip = atmel_hsmc_nand_select_chip;
> }
>
> -static int atmel_nand_detect(struct atmel_nand *nand)
> -{
> - struct nand_chip *chip = &nand->base;
> - struct mtd_info *mtd = nand_to_mtd(chip);
> - struct atmel_nand_controller *nc;
> - int ret;
> -
> - nc = to_nand_controller(chip->controller);
> -
> - ret = nand_scan_ident(mtd, nand->numcs, NULL);
> - if (ret)
> - dev_err(nc->dev, "nand_scan_ident() failed: %d\n", ret);
> -
> - return ret;
> -}
> -
> static int atmel_nand_unregister(struct atmel_nand *nand)
> {
> struct nand_chip *chip = &nand->base;
> @@ -1595,7 +1577,6 @@ static int atmel_nand_register(struct atmel_nand *nand)
> struct nand_chip *chip = &nand->base;
> struct mtd_info *mtd = nand_to_mtd(chip);
> struct atmel_nand_controller *nc;
> - int ret;
>
> nc = to_nand_controller(chip->controller);
>
> @@ -1626,21 +1607,6 @@ static int atmel_nand_register(struct atmel_nand *nand)
> }
> }
>
> - ret = nand_scan_tail(mtd);
> - if (ret) {
> - dev_err(nc->dev, "nand_scan_tail() failed: %d\n", ret);
> - return ret;
> - }
> -
> - ret = mtd_device_register(mtd, NULL, 0);
> - if (ret) {
> - dev_err(nc->dev, "Failed to register mtd device: %d\n", ret);
> - nand_cleanup(chip);
> - return ret;
> - }
> -
> - list_add_tail(&nand->node, &nc->chips);
> -

You can move all the code in atmel_nand_register() directly in
atmel_nand_controller_add_nand() + rename atmel_nand_unregister() into
atmel_nand_controller_remove_nand(). This should be done in a separate
patch so that the transition to nand_scan() is easier to review.

> return 0;
> }
>
> @@ -1755,6 +1721,8 @@ static int
> atmel_nand_controller_add_nand(struct atmel_nand_controller *nc,
> struct atmel_nand *nand)
> {
> + struct nand_chip *chip = &nand->base;
> + struct mtd_info *mtd = nand_to_mtd(chip);
> int ret;
>
> /* No card inserted, skip this NAND. */
> @@ -1765,15 +1733,30 @@ atmel_nand_controller_add_nand(struct atmel_nand_controller *nc,
>
> nc->caps->ops->nand_init(nc, nand);
>
> - ret = atmel_nand_detect(nand);
> - if (ret)
> + ret = nand_scan(mtd, nand->numcs);
> + if (ret) {
> + dev_err(nc->dev, "NAND scan failed: %d\n", ret);
> return ret;
> + }
>
> - ret = nc->caps->ops->ecc_init(nand);
> + ret = atmel_nand_register(nand);
> if (ret)
> - return ret;
> + goto cleanup_nand;
> +
> + ret = mtd_device_register(mtd, NULL, 0);
> + if (ret) {
> + dev_err(nc->dev, "Failed to register mtd device: %d\n", ret);
> + goto cleanup_nand;
> + }
> +
> + list_add_tail(&nand->node, &nc->chips);
> +
> + return 0;
> +
> +cleanup_nand:
> + nand_cleanup(chip);
>
> - return atmel_nand_register(nand);
> + return ret;
> }
>
> static int
> @@ -1958,6 +1941,19 @@ static const struct of_device_id atmel_matrix_of_ids[] = {
> { /* sentinel */ },
> };
>
> +static int atmel_nand_attach_chip(struct nand_chip *chip)
> +{
> + struct atmel_nand_controller *nc;
> +
> + nc = to_nand_controller(chip->controller);
> +
> + return nc->caps->ops->ecc_init(chip);
> +}
> +
> +static const struct nand_controller_ops atmel_nand_controller_ops = {
> + .attach_chip = atmel_nand_attach_chip,
> +};
> +
> static int atmel_nand_controller_init(struct atmel_nand_controller *nc,
> struct platform_device *pdev,
> const struct atmel_nand_controller_caps *caps)
> @@ -1967,6 +1963,7 @@ static int atmel_nand_controller_init(struct atmel_nand_controller *nc,
> int ret;
>
> nand_controller_init(&nc->base);
> + nc->base.ops = &atmel_nand_controller_ops;
> INIT_LIST_HEAD(&nc->chips);
> nc->dev = dev;
> nc->caps = caps;

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