linux-kernel - Re: [PATCH 0/3] Using SPI NOR flah on sunxi.

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Date:	Thu, 30 Apr 2015 20:34:36 +0200
From:	Marek Vasut <marex@...x.de>
To:	Michal Suchanek <hramrach@...il.com>
Cc:	Thomas.Betker@...de-schwarz.com,
	Alison Chaiken <alison_chaiken@...tor.com>,
	Huang Shijie <b32955@...escale.com>,
	"Bean Huo ????????? (beanhuo)" <beanhuo@...ron.com>,
	Ben Hutchings <ben@...adent.org.uk>,
	Brian Norris <computersforpeace@...il.com>,
	devicetree <devicetree@...r.kernel.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Kumar Gala <galak@...eaurora.org>,
	"grmoore@...era.com" <grmoore@...era.com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-mtd@...ts.infradead.org,
	"linux-mtd" <linux-mtd-bounces@...ts.infradead.org>,
	"linux-sunxi" <linux-sunxi@...glegroups.com>,
	Mark Rutland <mark.rutland@....com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Pawel Moll <pawel.moll@....com>,
	Rob Herring <robh+dt@...nel.org>,
	"Rafa?? Mi??ecki" <zajec5@...il.com>
Subject: Re: [PATCH 0/3] Using SPI NOR flah on sunxi.

On Thursday, April 30, 2015 at 06:56:18 PM, Michal Suchanek wrote:
> On 30 April 2015 at 18:30,  <Thomas.Betker@...de-schwarz.com> wrote:
> > Hello Michal:
> >> I tried to connect a SPI NOR flash to my sunxi board and due to the
> > 
> > current
> > 
> >> sunxi SPI driver limitations it does not work.
> >> 
> >> The SPI driver returns an error when more than 64 bytes are
> >> transferred at once
> >> due to lack of DMA support.
> > 
> > Wouldn't it be easier to fix the SPI driver to handle transfers larger
> > than 64 bytes, filling and draining the FIFO multiple times if
> > neccessary? (As far as I can tell, most SPI drivers do this.)
> 
> Yes, the intent is to fix this by adding dma support to the driver,
> eventually.
> 
> The patch might be still useful for other hardware with developing SPI
> support.

Please just fix the controller driver to correctly handle arbitrary transfer
lengths.

Best regards,
Marek Vasut
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