Re: [PATCH v9 1/9] mtd: nand: Create a helper to extract the ECC configuration

[Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>]

On Tue,  2 Jun 2020 16:31:16 +0200
Miquel Raynal <miquel.raynal@xxxxxxxxxxx> wrote:

> Despite its current name "eccreq", this object first stores data that
> is meant to be the requirements, and then this data gets eventually
> updated and becomes the actual configuration.

Despite its current name, the eccreq field actually encodes both the
NAND requirements and the final ECC configuration. That works fine when
using on-die ECC since those 2 concepts match perfectly, but it starts
being a problem as soon as we use on-host ECC engines, where we're not
guaranteed to have a perfect match.

> Abstracting this
> indirection will help us clarify the structures in a future change.

Let's hide the ECC configuration access behind a helper so we can later
split those 2 concepts.

> 
> Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
> ---
>  include/linux/mtd/nand.h | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
> index 2f838394b5f7..7fd0d492073b 100644
> --- a/include/linux/mtd/nand.h
> +++ b/include/linux/mtd/nand.h
> @@ -512,6 +512,16 @@ nanddev_get_memorg(struct nand_device *nand)
>  	return &nand->memorg;
>  }
>  
> +/**
> + * nanddev_get_ecc_conf() - Extract the ECC configuration from a NAND device
> + * @nand: NAND device
> + */
> +static inline const struct nand_ecc_props *
> +nanddev_get_ecc_conf(struct nand_device *nand)
> +{
> +	return &nand->eccreq;
> +}
> +
>  int nanddev_init(struct nand_device *nand, const struct nand_ops *ops,
>  		 struct module *owner);
>  void nanddev_cleanup(struct nand_device *nand);


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