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Message-ID: <20171227103609.GQ1827@finisterre>
Date: Wed, 27 Dec 2017 10:36:09 +0000
From: Mark Brown <broonie@...nel.org>
To: Trent Piepho <tpiepho@...inj.com>
Cc: "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
"linux@...linux.org.uk" <linux@...linux.org.uk>,
"cyrille.pitchen@...ev4u.fr" <cyrille.pitchen@...ev4u.fr>,
"dwmw2@...radead.org" <dwmw2@...radead.org>,
"computersforpeace@...il.com" <computersforpeace@...il.com>,
"boris.brezillon@...e-electrons.com"
<boris.brezillon@...e-electrons.com>,
"vigneshr@...com" <vigneshr@...com>,
"richard@....at" <richard@....at>,
"marek.vasut@...il.com" <marek.vasut@...il.com>,
"linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"nicolas.ferre@...rochip.com" <nicolas.ferre@...rochip.com>,
"robh@...nel.org" <robh@...nel.org>,
"radu.pirea@...rochip.com" <radu.pirea@...rochip.com>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 0/3] mtd: spi-nor: fix DMA-unsafe buffer issue between
MTD and SPI
On Tue, Dec 26, 2017 at 06:45:28PM +0000, Trent Piepho wrote:
> Or, since this only fixes instances of DMA-unsafe buffers used in
> access to SPI NOR flash chips, and since there are other SPI master
> interface users, those chip specific fixes in some/all spi master
> drivers are still needed to fix transfers not originated via spi-nor?
SPI client drivers are *supposed* to use DMA safe memory already. How
often that happens in cases where it matters is a separate question, we
definitely have users with smaller transfers that don't do the right
thing but they're normally done using PIO anyway.
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