From: Marek Vasut <marex@denx.de>
To: Michal Suchanek <hramrach@gmail.com>
Subject: Re: [PATCH 0/3] Using SPI NOR flah on sunxi.
Date: Thu, 30 Apr 2015 20:34:36 +0200
User-Agent: KMail/1.13.7 (Linux/3.13-trunk-amd64; KDE/4.13.1; x86_64; ; )
Cc: 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>,
        Brian Norris <computersforpeace@gmail.com>,
        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>
References: <cover.1430403750.git.hramrach@gmail.com> <OF23B05612.4290AF80-ONC1257E37.00589292-C1257E37.005AB106@rohde-schwarz.com> <CAOMqctRLnCJfVCYGjsmhORYNk+HCf07wwSXnZv4oqDxbaQqKGw@mail.gmail.com>
In-Reply-To: <CAOMqctRLnCJfVCYGjsmhORYNk+HCf07wwSXnZv4oqDxbaQqKGw@mail.gmail.com>
MIME-Version: 1.0
Content-Type: Text/Plain;
  charset="us-ascii"
Content-Transfer-Encoding: 7bit
Message-Id: <201504302034.36753.marex@denx.de>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1178
Lines: 33

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.

Best regards,
Marek Vasut
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/