linux-kernel - Re: [PATCH 00/11] Enable access to SPI NOR flash on Samsung Snow board

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Message-ID: <CAOMqctRkoQrP7wAgXfWXHb2fbi2-6VayHRx5DgUKn6Djz0qtQQ@mail.gmail.com>
Date:	Thu, 4 Jun 2015 06:21:32 +0200
From:	Michal Suchanek <hramrach@...il.com>
To:	Marek Vasut <marex@...x.de>
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Kukjin Kim <kgene@...nel.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Vinod Koul <vinod.koul@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	Han Xu <han.xu@...escale.com>, Mark Brown <broonie@...nel.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Rafał Miłecki <zajec5@...il.com>,
	Alison Chaiken <alison_chaiken@...tor.com>,
	Huang Shijie <b32955@...escale.com>,
	Ben Hutchings <ben@...adent.org.uk>,
	Knut Wohlrab <knut.wohlrab@...bosch.com>,
	Bean Huo 霍斌斌 (beanhuo) 
	<beanhuo@...ron.com>, "grmoore@...era.com" <grmoore@...era.com>,
	devicetree <devicetree@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	dmaengine <dmaengine@...r.kernel.org>,
	linux-mtd@...ts.infradead.org,
	linux-spi <linux-spi@...r.kernel.org>
Subject: Re: [PATCH 00/11] Enable access to SPI NOR flash on Samsung Snow board

On 4 June 2015 at 00:53, Marek Vasut <marex@...x.de> wrote:
> On Wednesday, June 03, 2015 at 11:26:39 PM, Michal Suchanek wrote:
>> Hello,
>
> Hi,
>
>> this patch series makes it possible to access the SPI NOR flash in the
>> Samsung XE303 'Snow' Chromebook.
>>
>> Unfortunately not all issues are resolved. To work around an issue with the
>> pl330 dma engine I respun the patch for limiting transfer size in m25p80
>> driver.
>
> Looks like fixing a bug at the wrong place to me ...
>
>> As the flash does not contain any sane filesystem and is only likely to be
>> accessed with mtd_debug or similar tool the limit of the dma engine is
>> easily reached. Filesystems using shorter data transfers are less likely
>> to be affected.
>
> Sounds like the DMA engine driver should be fixed.

I looked at the pl330 datasheet and don't see anything obviusly wrong
with the pl330 driver in Linux.

Ideally it would be fixed but I have no idea what's wrong with it.

Thanks

Michal
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