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Date: Wed, 20 May 2015 16:54:47 -0700 From: Brian Norris <computersforpeace@...il.com> To: Marek Vasut <marex@...x.de> Cc: Michal Suchanek <hramrach@...il.com>, 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>, 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>, linux-spi@...r.kernel.org, Mark Brown <broonie@...nel.org> Subject: Re: [PATCH 0/3] Using SPI NOR flah on sunxi. On Thu, Apr 30, 2015 at 08:34:36PM +0200, Marek Vasut wrote: > 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. Just noticed this. Yes, that would definitely be a better option! Brian -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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