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From: Mark Brown <broonie@kernel.org>
To: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Cc: Serge Semin <fancer.lancer@gmail.com>,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	Vinod Koul <vkoul@kernel.org>, Viresh Kumar <vireshk@kernel.org>,
	Dan Williams <dan.j.williams@intel.com>,
	Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>,
	Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	Paul Burton <paulburton@kernel.org>,
	Ralf Baechle <ralf@linux-mips.org>, Arnd Bergmann <arnd@arndb.de>,
	Rob Herring <robh+dt@kernel.org>,
	linux-mips@vger.kernel.org, devicetree@vger.kernel.org,
	dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 4/6] dmaengine: dw: Print warning if multi-block is unsupported
Date: Mon, 11 May 2020 12:58:13 +0100	[thread overview]
Message-ID: <20200511115813.GG8216@sirena.org.uk> (raw)
In-Reply-To: <20200511021016.wptcgnc3iq3kadgz@mobilestation>

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On Mon, May 11, 2020 at 05:10:16AM +0300, Serge Semin wrote:

> Alas linearizing the SPI messages won't help in this case because the DW DMA
> driver will split it into the max transaction chunks anyway.

That sounds like you need to also impose a limit on the maximum message
size as well then, with that you should be able to handle messages up
to whatever that limit is.  There's code for that bit already, so long
as the limit is not too low it should be fine for most devices and
client drivers can see the limit so they can be updated to work with it
if needed.

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  reply	other threads:[~2020-05-11 11:58 UTC|newest]

Thread overview: 73+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-06 13:10 [PATCH 0/5] dmaengine: dw: Take Baikal-T1 SoC DW DMAC peculiarities into account Sergey.Semin
2020-03-06 13:29 ` Andy Shevchenko
2020-03-06 13:30   ` Andy Shevchenko
2020-03-06 13:43     ` Vinod Koul
     [not found]     ` <20200306135050.40094803087C@mail.baikalelectronics.ru>
2020-03-09 21:45       ` Sergey Semin
     [not found]   ` <20200306133756.0F74C8030793@mail.baikalelectronics.ru>
2020-03-06 13:47     ` Sergey Semin
2020-03-06 14:11       ` Andy Shevchenko
     [not found]       ` <20200306141135.9C4F380307C2@mail.baikalelectronics.ru>
2020-03-09 22:08         ` Sergey Semin
2020-05-08 10:52 ` [PATCH v2 0/6] " Serge Semin
2020-05-08 10:52   ` [PATCH v2 1/6] dt-bindings: dma: dw: Convert DW DMAC to DT binding Serge Semin
2020-05-18 17:50     ` Rob Herring
2020-05-08 10:53   ` [PATCH v2 2/6] dt-bindings: dma: dw: Add max burst transaction length property Serge Semin
2020-05-08 11:12     ` Andy Shevchenko
2020-05-11 20:05       ` Serge Semin
2020-05-11 21:01         ` Andy Shevchenko
2020-05-11 21:35           ` Serge Semin
2020-05-12  9:08             ` Andy Shevchenko
2020-05-12 11:49               ` Serge Semin
2020-05-12 12:38                 ` Andy Shevchenko
2020-05-15  6:09                   ` Vinod Koul
2020-05-15 10:51                     ` Andy Shevchenko
2020-05-15 10:56                       ` Vinod Koul
2020-05-15 11:11                         ` Serge Semin
2020-05-17 17:47                           ` Serge Semin
2020-05-18 17:30                             ` Rob Herring
2020-05-18 19:30                               ` Serge Semin
2020-05-19 17:13                             ` Vinod Koul
2020-05-21  1:33                               ` Serge Semin
2020-05-08 10:53   ` [PATCH v2 3/6] dmaengine: dw: Set DMA device max segment size parameter Serge Semin
2020-05-08 11:21     ` Andy Shevchenko
2020-05-08 18:49       ` Vineet Gupta
2020-05-08 18:49         ` Vineet Gupta
2020-05-11 21:16       ` Serge Semin
2020-05-12 12:35         ` Andy Shevchenko
2020-05-12 17:01           ` Serge Semin
2020-05-15  6:16           ` Vinod Koul
2020-05-15 10:53             ` Andy Shevchenko
2020-05-17 18:22               ` Serge Semin
2020-05-08 10:53   ` [PATCH v2 4/6] dmaengine: dw: Print warning if multi-block is unsupported Serge Semin
2020-05-08 11:26     ` Andy Shevchenko
2020-05-08 11:53       ` Mark Brown
2020-05-08 19:06         ` Andy Shevchenko
2020-05-11  3:13           ` Serge Semin
2020-05-11 14:03             ` Andy Shevchenko
2020-05-11  2:10         ` Serge Semin
2020-05-11 11:58           ` Mark Brown [this message]
2020-05-11 13:45             ` Serge Semin
2020-05-11 13:58               ` Andy Shevchenko
2020-05-11 17:48                 ` Mark Brown
2020-05-11 18:25                   ` Serge Semin
2020-05-11 19:32                 ` Serge Semin
2020-05-11 21:07                   ` Andy Shevchenko
2020-05-11 21:08                     ` Andy Shevchenko
2020-05-12 12:42                       ` Serge Semin
2020-05-15  6:30                         ` Vinod Koul
2020-05-17 19:23                           ` Serge Semin
2020-05-19 17:02                             ` Vinod Koul
2020-05-21  1:40                               ` Serge Semin
2020-05-11 17:44               ` Mark Brown
2020-05-11 18:32                 ` Serge Semin
2020-05-11 21:32                   ` Mark Brown
2020-05-08 10:53   ` [PATCH v2 5/6] dmaengine: dw: Introduce max burst length hw config Serge Semin
2020-05-08 11:41     ` Andy Shevchenko
2020-05-12 14:08       ` Serge Semin
2020-05-12 19:12         ` Andy Shevchenko
2020-05-12 19:47           ` Serge Semin
2020-05-15 11:02             ` Andy Shevchenko
2020-05-15  6:39           ` Vinod Koul
2020-05-17 19:38             ` Serge Semin
2020-05-19 17:07               ` Vinod Koul
2020-05-21  1:47                 ` Serge Semin
2020-05-08 10:53   ` [PATCH v2 6/6] dmaengine: dw: Take HC_LLP flag into account for noLLP auto-config Serge Semin
2020-05-08 11:43     ` Andy Shevchenko

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