Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx> wrote on Wed, 27 May
2020 00:59:28 +0200:
> On Tue, 26 May 2020 21:56:21 +0200
> Miquel Raynal <miquel.raynal@xxxxxxxxxxx> wrote:
>
> > Now that the misleading mix between ECC engine type and OOB placement
> > has been addressed, add a new enumeration to properly define ECC types
> > (also called provider or mode).
> >
> > Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
> > Reviewed-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
> > ---
> > drivers/mtd/nand/raw/nand_base.c | 7 +++++++
> > include/linux/mtd/rawnand.h | 16 ++++++++++++++++
> > 2 files changed, 23 insertions(+)
> >
> > diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
> > index 515cd4681660..5c6ab5b93270 100644
> > --- a/drivers/mtd/nand/raw/nand_base.c
> > +++ b/drivers/mtd/nand/raw/nand_base.c
> > @@ -5018,6 +5018,13 @@ static const char * const nand_ecc_modes[] = {
> > [NAND_ECC_ON_DIE] = "on-die",
> > };
> >
> > +static const char * const nand_ecc_engine_providers[] = {
>
> This table is not used here, are you sure it should be introduced now?
>
> > + [NAND_ECC_ENGINE_NONE] = "none",
> > + [NAND_ECC_ENGINE_SOFT] = "soft",
> > + [NAND_ECC_ENGINE_CONTROLLER] = "hw",
>
> ^ "on-controller" ?
This would break DT backward compatibility, I am afraid I cannot do
that. Honnestly, I find "hw" good enough because "on-controller" is
also too restrictive. What about an external (non-pipelined) engine
like the one I am about to introduce?
>
> > + [NAND_ECC_ENGINE_ON_DIE] = "on-die",
> > +};
> > +
> > static const char * const nand_ecc_placement[] = {
> > [NAND_ECC_PLACEMENT_INTERLEAVED] = "interleaved",
> > };
> > diff --git a/include/linux/mtd/rawnand.h b/include/linux/mtd/rawnand.h
> > index dc909fb977c7..a2078c5f3d21 100644
> > --- a/include/linux/mtd/rawnand.h
> > +++ b/include/linux/mtd/rawnand.h
> > @@ -92,6 +92,22 @@ enum nand_ecc_mode {
> > NAND_ECC_ON_DIE,
> > };
> >
> > +/**
> > + * enum nand_ecc_engine_type - NAND ECC engine type/provider
> > + * @NAND_ECC_ENGINE_INVALID: Invalid value
> > + * @NAND_ECC_ENGINE_NONE: No ECC correction
> > + * @NAND_ECC_ENGINE_SOFT: Software ECC correction
> > + * @NAND_ECC_ENGINE_CONTROLLER: Hardware controller ECC correction
> > + * @NAND_ECC_ENGINE_ON_DIE: On chip hardware ECC correction
> > + */
> > +enum nand_ecc_engine_type {
> > + NAND_ECC_ENGINE_INVALID,
> > + NAND_ECC_ENGINE_NONE,
> > + NAND_ECC_ENGINE_SOFT,
> > + NAND_ECC_ENGINE_CONTROLLER,
> > + NAND_ECC_ENGINE_ON_DIE,
> > +};
> > +
> > /**
> > * enum nand_ecc_placement - NAND ECC placement
> > * @NAND_ECC_PLACEMENT_FREE: The driver can decide where to put ECC bytes.
>
