linux-kernel - Re: [PATCH 3/5] spi: sunxi: expose maximum transfer size limit

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Message-ID: <20160601181439.GB4908@lukather>
Date:	Wed, 1 Jun 2016 20:14:39 +0200
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Michal Suchanek <hramrach@...il.com>
Cc:	linux-sunxi <linux-sunxi@...glegroups.com>,
	Mark Brown <broonie@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
	linux-spi <linux-spi@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/5] spi: sunxi: expose maximum transfer size limit

On Mon, May 30, 2016 at 10:57:10AM +0200, Michal Suchanek wrote:
> Hello,
> 
> On 30 May 2016 at 10:37, Maxime Ripard <maxime.ripard@...e-electrons.com> 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@...e-electrons.com>

Thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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