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From:   Chuanhong Guo <gch981213@gmail.com>
Date:   Fri, 8 Nov 2019 11:52:06 +0800
Message-ID: <CAJsYDVK7E-LMyA2eH5VhFu9EQWur_BLRNRg0-YTsOiJ+GyEF4g@mail.gmail.com>
Subject: Re: [PATCH 1/2] mtd: mtk-quadspi: add support for memory-mapped flash reading
To:     linux-mtd@lists.infradead.org,
        Yingjoe Chen <yingjoe.chen@mediatek.com>
Cc:     David Woodhouse <dwmw2@infradead.org>,
        Brian Norris <computersforpeace@gmail.com>,
        Miquel Raynal <miquel.raynal@bootlin.com>,
        Richard Weinberger <richard@nod.at>,
        Vignesh Raghavendra <vigneshr@ti.com>,
        Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        Tudor Ambarus <tudor.ambarus@microchip.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@vger.kernel.org>, linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org,
        open list <linux-kernel@vger.kernel.org>
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Hi all!

On Wed, Nov 6, 2019 at 10:08 PM Chuanhong Guo <gch981213@gmail.com> wrote:
>
> PIO reading mode on this controller is ridiculously inefficient
> (one cmd+addr+dummy sequence reads only one byte)
> This patch adds support for reading from memory-mapped flash area
> which increases reading speed from 1MB/s to 5.6MB/s
>
> Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
> ---
>  drivers/mtd/spi-nor/mtk-quadspi.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
>

I'll abandon this patchset and implement DMA reading instead.

Regards,
Chuanhong Guo