Re: [PATCH 3/5] spi: sunxi: expose maximum transfer size limit
From: Maxime Ripard
Date: Wed Jun 01 2016 - 14:14:50 EST
On Mon, May 30, 2016 at 10:57:10AM +0200, Michal Suchanek wrote:
> On 30 May 2016 at 10:37, Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx> wrote:
> > On Thu, May 26, 2016 at 07:25:24PM -0000, Michal Suchanek wrote:
> >> The sun4i spi hardware can trasfer at most 63 bytes of data without DMA
> >> support so report the limitation. Same on sun6i.
> > Is it? Is there timeouts on the A31 and later SoCs?
> I have no sun6i hardware to test with.
> This is an advisory limit you can query and it better be smaller
> rather than unreliable. The hard limit in the driver is still
> SUN6I_FIFO_DEPTH (which is 128 bytes on sun6i).
> You can test his without any actual SPI device. Unused pins you can
> multiplex as SPI suffice.
Ok, for the time being:
Acked-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx>
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
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