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

Rob Herring
2017-01-04T14:07:50Z

On Mon, Jan 02, 2017 at 11:03:43PM +0000, Andre Przywara wrote:
> From: Maxime Ripard <maxime.ripard@free-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@free-electrons.com>
> Signed-off-by: Andre Przywara <andre.przywara@arm.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@kernel.org>