linux-kernel - Re: [PATCH 2/5] drivers: mmc: sunxi: limit A64 MMC2 to 8K DMA buffer

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Date:   Wed, 4 Jan 2017 08:07:50 -0600
From:   Rob Herring <robh@...nel.org>
To:     Andre Przywara <andre.przywara@....com>
Cc:     Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Hans De Goede <hdegoede@...hat.com>,
        Icenowy Zheng <icenowy@...c.xyz>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, linux-mmc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...glegroups.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] drivers: mmc: sunxi: limit A64 MMC2 to 8K DMA buffer

On Mon, Jan 02, 2017 at 11:03:43PM +0000, Andre Przywara wrote:
> From: Maxime Ripard <maxime.ripard@...e-electrons.com>
> 
> Unlike the A64 user manual reports, the third MMC controller on the
> A64 (and the only one capable of 8-bit HS400 eMMC transfers) has a
> DMA buffer size limit of 8KB (much like the very old Allwinner SoCs).
> This does not affect the other two controllers, so introduce a new
> DT compatible string to let the driver use different settings for that
> particular device. This will also help to enable the high-speed transfer
> modes of that controller later.
> 
> Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
> Signed-off-by: Andre Przywara <andre.przywara@....com>
> ---
>  Documentation/devicetree/bindings/mmc/sunxi-mmc.txt | 1 +
>  drivers/mmc/host/sunxi-mmc.c                        | 7 +++++++
>  2 files changed, 8 insertions(+)

Acked-by: Rob Herring <robh@...nel.org>