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In-Reply-To: <20200925145255.v3.3.I7a3fc5678a81654574e8852d920db94bcc4d3eb8@changeid>
From:   Chuanhong Guo <gch981213@gmail.com>
Date:   Fri, 25 Sep 2020 15:53:02 +0800
Message-ID: <CAJsYDVLmqCBW4OHVmKDCBb+BE=4gZeOao8khZdx77k3=V9vCgw@mail.gmail.com>
Subject: Re: [PATCH v3 3/6] spi: spi-mtk-nor: support 7 bytes transfer of
 generic spi
To:     Ikjoon Jang <ikjn@chromium.org>
Cc:     Rob Herring <robh+dt@kernel.org>, Mark Brown <broonie@kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@vger.kernel.org>, linux-spi@vger.kernel.org,
        linux-mtd@lists.infradead.org,
        Matthias Brugger <matthias.bgg@gmail.com>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@lists.infradead.org>,
        open list <linux-kernel@vger.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@lists.infradead.org>
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HI!
One more comment:
On Fri, Sep 25, 2020 at 2:55 PM Ikjoon Jang <ikjn@chromium.org> wrote:
> +static bool mtk_nor_check_prg(const struct spi_mem_op *op)
> +{
> +       size_t len = op->cmd.nbytes + op->addr.nbytes + op->dummy.nbytes;
> +
> +       if (len > MTK_NOR_PRG_MAX_SIZE)
> +               return false;
> +
> +       if (!op->data.nbytes)
> +               return true;
> +
> +       if (op->data.dir == SPI_MEM_DATA_OUT)
> +               return ((len + op->data.nbytes) <= MTK_NOR_PRG_MAX_SIZE);
> +       else if (op->data.dir == SPI_MEM_DATA_IN)
> +               return ((len + op->data.nbytes) <= MTK_NOR_PRG_MAX_CYCLES);

You need to consider the existence of adjust_op_size in supports_op as well.
This mtk_nor_check_prg still rejects SFDP reading command from spi-nor
driver altogether.

-- 
Regards,
Chuanhong Guo