From: Mark Brown <broonie@kernel.org>
To: Trent Piepho <tpiepho@impinj.com>
Cc: "linux-mtd@lists.infradead.org" <linux-mtd@lists.infradead.org>,
"linux@armlinux.org.uk" <linux@armlinux.org.uk>,
"cyrille.pitchen@wedev4u.fr" <cyrille.pitchen@wedev4u.fr>,
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"computersforpeace@gmail.com" <computersforpeace@gmail.com>,
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<boris.brezillon@free-electrons.com>,
"vigneshr@ti.com" <vigneshr@ti.com>,
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"marek.vasut@gmail.com" <marek.vasut@gmail.com>,
"linux-spi@vger.kernel.org" <linux-spi@vger.kernel.org>,
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Subject: Re: [PATCH 0/3] mtd: spi-nor: fix DMA-unsafe buffer issue between MTD and SPI
Date: Wed, 27 Dec 2017 10:36:09 +0000 [thread overview]
Message-ID: <20171227103609.GQ1827@finisterre> (raw)
In-Reply-To: <1514313927.26695.19.camel@impinj.com>
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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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next prev parent reply other threads:[~2017-12-27 10:36 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-24 4:36 [PATCH 0/3] mtd: spi-nor: fix DMA-unsafe buffer issue between MTD and SPI Cyrille Pitchen
2017-12-24 4:36 ` [PATCH 1/3] mtd: spi-nor: add optional DMA-safe bounce buffer for data transfer Cyrille Pitchen
2017-12-26 13:42 ` Vignesh R
2017-12-26 13:59 ` Cyrille Pitchen
2018-01-07 20:07 ` Boris Brezillon
2017-12-26 19:43 ` Trent Piepho
2017-12-28 10:39 ` Cyrille Pitchen
2017-12-28 18:54 ` Trent Piepho
2017-12-29 10:16 ` Vignesh R
2017-12-29 18:03 ` Trent Piepho
2018-01-02 10:00 ` Vignesh R
2018-01-07 20:49 ` Boris Brezillon
2017-12-24 4:36 ` [PATCH 2/3] dt-bindings: mtd: atmel-quadspi: add an optional property 'dmacap, memcpy' Cyrille Pitchen
2017-12-26 23:23 ` [PATCH 2/3] dt-bindings: mtd: atmel-quadspi: add an optional property 'dmacap,memcpy' Rob Herring
2017-12-27 21:40 ` Cyrille Pitchen
2018-01-02 10:22 ` Ludovic Desroches
2018-01-02 19:18 ` Trent Piepho
2018-01-03 6:51 ` ludovic.desroches
2018-01-03 11:51 ` Mark Brown
2017-12-24 4:36 ` [PATCH 3/3] mtd: atmel-quadspi: add support of DMA memcpy() Cyrille Pitchen
2017-12-26 18:45 ` [PATCH 0/3] mtd: spi-nor: fix DMA-unsafe buffer issue between MTD and SPI Trent Piepho
2017-12-27 10:36 ` Mark Brown [this message]
2017-12-27 20:15 ` Trent Piepho
2017-12-28 9:36 ` Cyrille Pitchen
2018-01-03 11:49 ` Mark Brown
2017-12-29 9:16 ` Vignesh R
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