[PATCH v3 2/6] spi: spi-mtk-nor: fix mishandled logics in checking SPI memory operation

[Ikjoon Jang]

On Fri, Sep 25, 2020 at 2:54 PM Ikjoon Jang <ikjn at chromium.org> wrote:
>
> Fix a bug which limits its protocol availability in supports_op().
>
> Fixes: a59b2c7c56bf ("spi: spi-mtk-nor: support standard spi properties")
> Signed-off-by: Ikjoon Jang <ikjn at chromium.org>
> ---

This is also duplicated work of https://patchwork.kernel.org/patch/11797723/,
I'm going to drop this patch in v4.

>
> (no changes since v1)
>
>  drivers/spi/spi-mtk-nor.c | 26 +++++++++++---------------
>  1 file changed, 11 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/spi/spi-mtk-nor.c b/drivers/spi/spi-mtk-nor.c
> index 6e6ca2b8e6c8..0f7d4ec68730 100644
> --- a/drivers/spi/spi-mtk-nor.c
> +++ b/drivers/spi/spi-mtk-nor.c
> @@ -211,28 +211,24 @@ static bool mtk_nor_supports_op(struct spi_mem *mem,
>         if (op->cmd.buswidth != 1)
>                 return false;
>
> +       if (!spi_mem_default_supports_op(mem, op))
> +               return false;
> +
>         if ((op->addr.nbytes == 3) || (op->addr.nbytes == 4)) {
> -               switch(op->data.dir) {
> -               case SPI_MEM_DATA_IN:
> -                       if (!mtk_nor_match_read(op))
> -                               return false;
> -                       break;
> -               case SPI_MEM_DATA_OUT:
> -                       if ((op->addr.buswidth != 1) ||
> -                           (op->dummy.nbytes != 0) ||
> -                           (op->data.buswidth != 1))
> -                               return false;
> -                       break;
> -               default:
> -                       break;
> -               }
> +               if ((op->data.dir == SPI_MEM_DATA_IN) && mtk_nor_match_read(op))
> +                       return true;
> +               else if (op->data.dir == SPI_MEM_DATA_OUT)
> +                       return (op->addr.buswidth == 1) &&
> +                              (op->dummy.nbytes == 0) &&
> +                              (op->data.buswidth == 1);
>         }
> +
>         len = op->cmd.nbytes + op->addr.nbytes + op->dummy.nbytes;
>         if ((len > MTK_NOR_PRG_MAX_SIZE) ||
>             ((op->data.nbytes) && (len == MTK_NOR_PRG_MAX_SIZE)))
>                 return false;
>
> -       return spi_mem_default_supports_op(mem, op);
> +       return true;
>  }
>
>  static void mtk_nor_setup_bus(struct mtk_nor *sp, const struct spi_mem_op *op)
> --
> 2.28.0.681.g6f77f65b4e-goog
>