linux-kernel - Re: [PATCH 1/2] mtd: mtk-quadspi: add support for memory-mapped flash reading

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

Hi all!

On Wed, Nov 6, 2019 at 10:08 PM Chuanhong Guo <gch981213@...il.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@...il.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