From: Brian Norris <computersforpeace@gmail.com>
To: Marek Vasut <marex@denx.de>
Cc: Michal Suchanek <hramrach@gmail.com>,
Thomas.Betker@rohde-schwarz.com,
Alison Chaiken <alison_chaiken@mentor.com>,
Huang Shijie <b32955@freescale.com>,
"Bean Huo ????????? (beanhuo)" <beanhuo@micron.com>,
Ben Hutchings <ben@decadent.org.uk>,
devicetree <devicetree@vger.kernel.org>,
David Woodhouse <dwmw2@infradead.org>,
Kumar Gala <galak@codeaurora.org>,
"grmoore@altera.com" <grmoore@altera.com>,
Ian Campbell <ijc+devicetree@hellion.org.uk>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-mtd@lists.infradead.org,
linux-mtd <linux-mtd-bounces@lists.infradead.org>,
linux-sunxi <linux-sunxi@googlegroups.com>,
Mark Rutland <mark.rutland@arm.com>,
Mika Westerberg <mika.westerberg@linux.intel.com>,
Pawel Moll <pawel.moll@arm.com>, Rob Herring <robh+dt@kernel.org>,
Rafa?? Mi??ecki <zajec5@gmail.com>,
linux-spi@vger.kernel.org, Mark Brown <broonie@kernel.o>
Subject: Re: [PATCH 0/3] Using SPI NOR flah on sunxi.
Date: Wed, 20 May 2015 16:54:47 -0700 [thread overview]
Message-ID: <20150520235447.GZ11598@ld-irv-0074> (raw)
In-Reply-To: <201504302034.36753.marex@denx.de>
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@rohde-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
next prev parent reply other threads:[~2015-05-20 23:54 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-30 14:22 [PATCH 0/3] Using SPI NOR flah on sunxi Michal Suchanek
2015-04-30 16:30 ` Thomas.Betker
[not found] ` <OF23B05612.4290AF80-ONC1257E37.00589292-C1257E37.005AB106-Bf/A/FSCP0w3s4ca2cGeAgC/G2K4zDHf@public.gmane.org>
2015-04-30 16:56 ` Michal Suchanek
[not found] ` <CAOMqctRLnCJfVCYGjsmhORYNk+HCf07wwSXnZv4oqDxbaQqKGw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-04-30 18:34 ` Marek Vasut
2015-05-20 23:54 ` Brian Norris [this message]
2015-04-30 16:30 ` Thomas.Betker
2015-04-30 16:30 ` Thomas.Betker
[not found] ` <cover.1430403750.git.hramrach-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-04-30 13:33 ` [PATCH 1/3] MTD: m25p80: fix write return value Michal Suchanek
[not found] ` <55132b4496e7fe73f949186c0f140f3e4fd4e2c7.1430403750.git.hramrach-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-04-30 18:43 ` Marek Vasut
[not found] ` <201504302043.11118.marex-ynQEQJNshbs@public.gmane.org>
2015-04-30 21:37 ` Michal Suchanek
2015-04-30 13:38 ` [PATCH 2/3] MTD: spi-nor: check for short writes in spi_nor_write Michal Suchanek
[not found] ` <50c40ef17ab6566f35ef5a4426bf23567f896db7.1430403750.git.hramrach-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-05-20 23:38 ` Brian Norris
2015-05-21 8:39 ` Michal Suchanek
[not found] ` <CAOMqctTYqDWL51twOuGi+oXONXQ4B2-2BkdJNSpzZAXshZUN6g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-05-21 10:28 ` Mark Brown
[not found] ` <20150521102802.GS21577-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2015-05-22 7:17 ` Brian Norris
2015-04-30 13:46 ` [PATCH 3/3] MTD: m25p80: Add option to limit SPI transfer size Michal Suchanek
[not found] ` <3b0c112672f364452e80c333048161eaffb655db.1430403750.git.hramrach-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-04-30 14:58 ` Julian Calaby
[not found] ` <CAGRGNgXKrpJ8rc4h4BykgHsn3kfT5fuAssMK1bQJtxhVL=s2BA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-05-20 23:27 ` Brian Norris
2015-04-30 16:30 ` [PATCH 0/3] Using SPI NOR flah on sunxi Thomas.Betker-Bf/A/FSCP0w3s4ca2cGeAgC/G2K4zDHf
2015-05-01 12:27 ` Stefan Monnier
[not found] ` <jwv4mnwfppf.fsf-monnier+gmane.comp.hardware.netbook.arm.sunxi-mXXj517/zsQ@public.gmane.org>
2015-05-04 10:32 ` [linux-sunxi] " Michal Suchanek
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