linux-kernel - Re: [PATCH v10 04/17] spi: spi-mtk-nor: reject DTR ops

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Message-ID: <b0e86071-2808-ec4b-e09c-3614bc9c205a@microchip.com>
Date:   Mon, 13 Jul 2020 06:24:37 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <p.yadav@...com>, <miquel.raynal@...tlin.com>, <richard@....at>,
        <vigneshr@...com>, <broonie@...nel.org>,
        <Nicolas.Ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
        <Ludovic.Desroches@...rochip.com>, <matthias.bgg@...il.com>,
        <michal.simek@...inx.com>, <linux-mtd@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-spi@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>
CC:     <nsekhar@...com>, <boris.brezillon@...labora.com>
Subject: Re: [PATCH v10 04/17] spi: spi-mtk-nor: reject DTR ops

On 6/23/20 9:30 PM, Pratyush Yadav wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> Double Transfer Rate (DTR) ops are added in spi-mem. But this controller
> doesn't support DTR transactions. Since we don't use the default
> supports_op(), which rejects all DTR ops, do that explicitly in our
> supports_op().
> 
> Signed-off-by: Pratyush Yadav <p.yadav@...com>

Reviewed-by: Tudor Ambarus <tudor.ambarus@...rochip.com>

> ---
>  drivers/spi/spi-mtk-nor.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/spi/spi-mtk-nor.c b/drivers/spi/spi-mtk-nor.c
> index d5f393871619..b08d8e9a8ee9 100644
> --- a/drivers/spi/spi-mtk-nor.c
> +++ b/drivers/spi/spi-mtk-nor.c
> @@ -211,6 +211,12 @@ static bool mtk_nor_supports_op(struct spi_mem *mem,
>         if (op->cmd.buswidth != 1)
>                 return false;
> 
> +       /* DTR ops not supported. */
> +       if (op->cmd.dtr || op->addr.dtr || op->dummy.dtr || op->data.dtr)
> +               return false;
> +       if (op->cmd.nbytes != 1)
> +               return false;
> +
>         if ((op->addr.nbytes == 3) || (op->addr.nbytes == 4)) {
>                 if ((op->data.dir == SPI_MEM_DATA_IN) && mtk_nor_match_read(op))
>                         return true;
> --
> 2.27.0
>