Re: [PATCH V2] mtd: rawnand: denali_dt: Add support for configuring SPARE_AREA_SKIP_BYTES

[Masahiro Yamada <masahiroy@xxxxxxxxxx>]

On Fri, Dec 20, 2019 at 6:39 PM Marek Vasut <marex@xxxxxxx> wrote:
>
> The SPARE_AREA_SKIP_BYTES register is reset when the controller reset
> signal is toggled. Yet, this register must be configured to match the
> content of the NAND OOB area. The current default value is always set
> to 8 and is programmed into the hardware in case the hardware was not
> programmed before (e.g. in a bootloader) with a different value. This
> however does not work when the block is reset properly by Linux.
>
> On Altera SoCFPGA CycloneV, ArriaV and Arria10, which are the SoCFPGA
> platforms which support booting from NAND, the SPARE_AREA_SKIP_BYTES
> value must be set to 2. On Socionext Uniphier, the value is 8. This
> patch adds support for preconfiguring the default value and handles
> the special SoCFPGA case by setting the default to 2 on all SoCFPGA
> platforms, while retaining the original behavior and default value of
> 8 on all the other platforms.
>
> Signed-off-by: Marek Vasut <marex@xxxxxxx>
> Cc: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
> Cc: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
> Cc: Richard Weinberger <richard@xxxxxx>
> Cc: Vignesh Raghavendra <vigneshr@xxxxxx>
> To: linux-mtd@xxxxxxxxxxxxxxxxxxx
> Reviewed-by: Tudor Ambarus <tudor.ambarus@xxxxxxxxxxxxx>
> ---
> V2: Move denali->oob_skip_bytes = data->oob_skip_bytes; right after
>     of_device_get_match_data()


FYI.

This patch was rebased to avoid a conflict:
http://patchwork.ozlabs.org/patch/1214018/

My Ack is in v3.


I solved a merge conflict, and bundled in a series:
http://patchwork.ozlabs.org/project/linux-mtd/list/?series=149821




> ---
>  drivers/mtd/nand/raw/denali.c    | 13 ++++++++++---
>  drivers/mtd/nand/raw/denali_dt.c |  5 +++++
>  2 files changed, 15 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mtd/nand/raw/denali.c b/drivers/mtd/nand/raw/denali.c
> index 3102ddbd8abdb..b6c463d021677 100644
> --- a/drivers/mtd/nand/raw/denali.c
> +++ b/drivers/mtd/nand/raw/denali.c
> @@ -1302,14 +1302,21 @@ int denali_init(struct denali_controller *denali)
>
>         /*
>          * Set how many bytes should be skipped before writing data in OOB.
> +        * If a non-zero value has already been configured, update it in HW.
>          * If a non-zero value has already been set (by firmware or something),
>          * just use it. Otherwise, set the driver's default.
>          */
> -       denali->oob_skip_bytes = ioread32(denali->reg + SPARE_AREA_SKIP_BYTES);
> -       if (!denali->oob_skip_bytes) {
> -               denali->oob_skip_bytes = DENALI_DEFAULT_OOB_SKIP_BYTES;
> +       if (denali->oob_skip_bytes) {
>                 iowrite32(denali->oob_skip_bytes,
>                           denali->reg + SPARE_AREA_SKIP_BYTES);
> +       } else {
> +               denali->oob_skip_bytes =
> +                       ioread32(denali->reg + SPARE_AREA_SKIP_BYTES);
> +               if (!denali->oob_skip_bytes) {
> +                       denali->oob_skip_bytes = DENALI_DEFAULT_OOB_SKIP_BYTES;
> +                       iowrite32(denali->oob_skip_bytes,
> +                                 denali->reg + SPARE_AREA_SKIP_BYTES);
> +               }
>         }
>
>         iowrite32(0, denali->reg + TRANSFER_SPARE_REG);
> diff --git a/drivers/mtd/nand/raw/denali_dt.c b/drivers/mtd/nand/raw/denali_dt.c
> index 8b779a899dcf4..443f9c1f6854d 100644
> --- a/drivers/mtd/nand/raw/denali_dt.c
> +++ b/drivers/mtd/nand/raw/denali_dt.c
> @@ -27,6 +27,7 @@ struct denali_dt {
>  struct denali_dt_data {
>         unsigned int revision;
>         unsigned int caps;
> +       unsigned int oob_skip_bytes;
>         const struct nand_ecc_caps *ecc_caps;
>  };
>
> @@ -34,6 +35,7 @@ NAND_ECC_CAPS_SINGLE(denali_socfpga_ecc_caps, denali_calc_ecc_bytes,
>                      512, 8, 15);
>  static const struct denali_dt_data denali_socfpga_data = {
>         .caps = DENALI_CAP_HW_ECC_FIXUP,
> +       .oob_skip_bytes = 2,
>         .ecc_caps = &denali_socfpga_ecc_caps,
>  };
>
> @@ -42,6 +44,7 @@ NAND_ECC_CAPS_SINGLE(denali_uniphier_v5a_ecc_caps, denali_calc_ecc_bytes,
>  static const struct denali_dt_data denali_uniphier_v5a_data = {
>         .caps = DENALI_CAP_HW_ECC_FIXUP |
>                 DENALI_CAP_DMA_64BIT,
> +       .oob_skip_bytes = 8,
>         .ecc_caps = &denali_uniphier_v5a_ecc_caps,
>  };
>
> @@ -51,6 +54,7 @@ static const struct denali_dt_data denali_uniphier_v5b_data = {
>         .revision = 0x0501,
>         .caps = DENALI_CAP_HW_ECC_FIXUP |
>                 DENALI_CAP_DMA_64BIT,
> +       .oob_skip_bytes = 8,
>         .ecc_caps = &denali_uniphier_v5b_ecc_caps,
>  };
>
> @@ -122,6 +126,7 @@ static int denali_dt_probe(struct platform_device *pdev)
>                 denali->revision = data->revision;
>                 denali->caps = data->caps;
>                 denali->ecc_caps = data->ecc_caps;
> +               denali->oob_skip_bytes = data->oob_skip_bytes;
>         }
>
>         denali->dev = dev;
> --
> 2.24.1
>
>
> ______________________________________________________
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> http://lists.infradead.org/mailman/listinfo/linux-mtd/



-- 
Best Regards
Masahiro Yamada

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