From: Robert Jarzmik <robert.jarzmik@free.fr>
To: Daniel Mack <zonque@gmail.com>
Cc: mark.rutland@arm.com, s.neumann@raumfeld.com,
linux-mtd@lists.infradead.org, haojian.zhuang@linaro.org,
cxie4@marvell.com, lars@metafoo.de, nico@linaro.org,
vinod.koul@intel.com, marek.vasut@gmail.com,
ezequiel.garcia@free-electrons.com, rmk+kernel@arm.linux.org.uk,
devicetree@vger.kernel.org, samuel@sortiz.org, arnd@arndb.de,
broonie@kernel.org, mika.westerberg@linux.intel.com,
linux-arm-kernel@lists.infradead.org,
thomas.petazzoni@free-electrons.com, eric.y.miao@gmail.com,
gregkh@linuxfoundation.org, davem@davemloft.net,
sachin.kamat@linaro.org, kernel@pengutronix.de, djbw@fb.com,
g.liakhovetski@gmx.de
Subject: Re: [PATCH 00/20] ARM: pxa: move core and drivers to dmaengine
Date: Sat, 10 Aug 2013 00:50:15 +0200 [thread overview]
Message-ID: <87zjsqzdg8.fsf@free.fr> (raw)
In-Reply-To: <1375889649-14638-1-git-send-email-zonque@gmail.com> (Daniel Mack's message of "Wed, 7 Aug 2013 17:33:49 +0200")
Daniel Mack <zonque@gmail.com> writes:
> * camera driver:
> I started the transition, but I'm not sure how much sense that
> makes without access to the hardware. I'd much appreciate if
> anyone could volunteer for this piece; I'll happily share what
> I got so far. Sascha, Sachin, Guennadi?
Hi Daniel,
Do you mean this driver ? :
drivers/media/platform/soc_camera/pxa_camera.c
In that case I might help. But before I can do that, I have to be convinced that
dmaengine can deal with this driver. I'm thinking in particular of :
- "hot running DMA" queuing
- multiple DMA channel synchronization (ie. 3 channel sync)
All that is described in there :
Documentation/video4linux/pxa_camera.txt
If someone with dmaengine knowledge could have a look at pxa_camera.txt (maybe
Vinod ?) and tell me that dma_engine framework fullfills the 2 requirements,
then I'll be happy to help.
One minor point though is that I'm working on pxa27x. If the serie is not
compatible in a way with pxa27x, I won't be able to do anything.
Another point I'd like to know, is what is the performance penalty in using
dmaengine, and do you have any figures ?
Lastly, they was debug information to debug descriptors chaining, channel
statuses, requestors. I didn't see where these had gone, could you point me to
the right file ?
Cheers.
--
Robert
next prev parent reply other threads:[~2013-08-09 22:50 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-07 15:33 [PATCH 00/20] ARM: pxa: move core and drivers to dmaengine Daniel Mack
2013-08-07 15:33 ` [PATCH 01/20] mtd: pxa3xx-nand: replace pxa_request_dma with dmaengine Daniel Mack
2013-08-07 17:46 ` Ezequiel Garcia
2013-08-08 6:42 ` Daniel Mack
2013-08-08 10:12 ` Ezequiel Garcia
2013-08-08 10:14 ` Daniel Mack
2013-08-07 15:33 ` [PATCH 02/20] mtd: pxa3xx-nand: use mmp_pdma_filter_fn and dma_request_slave_channel_compat Daniel Mack
2013-08-07 15:33 ` [PATCH 03/20] ARM: pxa: ssp: add shortcut for &pdev->dev Daniel Mack
2013-08-08 7:32 ` Brian Norris
2013-08-08 7:52 ` Artem Bityutskiy
2013-08-08 8:20 ` Daniel Mack
2013-08-07 15:33 ` [PATCH 04/20] ARM: pxa: ssp: add DT bindings Daniel Mack
2013-08-07 15:54 ` Arnd Bergmann
2013-08-07 15:33 ` [PATCH 05/20] ARM: pxa: ssp: use devm_ functions Daniel Mack
2013-08-07 15:33 ` [PATCH 06/20] tty: serial: pxa: remove old cruft Daniel Mack
2013-08-07 15:33 ` [PATCH 07/20] spi: spi-pxa2xx: remove legacy PXA DMA bits Daniel Mack
2013-08-07 15:55 ` Mark Brown
2013-08-07 15:59 ` Daniel Mack
2013-08-07 16:41 ` Mark Brown
2013-08-07 15:33 ` [PATCH 08/20] mmc: host: pxamci: switch over to dmaengine use Daniel Mack
2014-10-15 18:32 ` Vasily Khoruzhick
2014-10-16 17:57 ` Vasily Khoruzhick
2013-08-07 15:33 ` [PATCH 09/20] ata: pdata_pxa: migrate over to dmaengine usage Daniel Mack
2013-08-07 15:59 ` Arnd Bergmann
2013-08-07 15:33 ` [PATCH 10/20] net: irda: pxaficp_ir: switch to dmaengine Daniel Mack
2013-08-07 15:34 ` [PATCH 11/20] net: smc91x.c: switch to generic buf-to-buf DMA offload Daniel Mack
2013-08-07 15:34 ` [PATCH 12/20] net: smc911x.c: switch to dmaengine API Daniel Mack
2013-08-07 15:34 ` [PATCH 13/20] ASoC: pxa: pxa-ssp: add DT bindings Daniel Mack
2013-08-07 16:40 ` Mark Brown
2013-08-08 9:39 ` Daniel Mack
2013-08-08 13:20 ` Mark Brown
2013-08-09 13:03 ` Daniel Mack
2013-08-07 15:34 ` [PATCH 14/20] ASoC: pxa: use snd_dmaengine_dai_dma_data Daniel Mack
2013-08-07 15:57 ` Mark Brown
2013-08-07 15:34 ` [PATCH 15/20] ASoC: pxa: pxa-ssp: set dma filter data from startup hook Daniel Mack
2013-08-07 15:58 ` Mark Brown
2013-08-07 15:34 ` [PATCH 16/20] ASoC: pxa: add DT bindings for pxa2xx-pcm Daniel Mack
2013-08-07 16:06 ` Mark Brown
2013-08-07 15:34 ` [PATCH 17/20] ASoC: pxa: pxa-pcm-lib: switch over to snd-soc-dmaengine-pcm Daniel Mack
2013-08-07 16:07 ` Mark Brown
2013-08-07 16:10 ` Daniel Mack
2013-08-07 16:32 ` Mark Brown
2013-08-08 8:18 ` Daniel Mack
2013-08-08 8:44 ` Lars-Peter Clausen
2013-08-08 9:03 ` Daniel Mack
2013-08-08 9:36 ` Mark Brown
2013-08-08 9:43 ` Daniel Mack
2013-08-08 10:35 ` Mark Brown
2013-08-08 10:39 ` Daniel Mack
2013-08-08 11:03 ` Mark Brown
2013-08-08 10:25 ` Russell King - ARM Linux
2013-08-07 15:34 ` [PATCH 18/20] ARM: pxa: register static mmp_pdma device Daniel Mack
2013-08-07 15:34 ` [PATCH 19/20] ARM: mmp: " Daniel Mack
2013-08-07 15:34 ` [PATCH 20/20] ARM: pxa: remove old DMA implementation Daniel Mack
2013-08-07 16:08 ` [PATCH 00/20] ARM: pxa: move core and drivers to dmaengine Arnd Bergmann
2013-08-09 22:50 ` Robert Jarzmik [this message]
2013-08-10 10:56 ` Daniel Mack
2013-08-11 20:05 ` Robert Jarzmik
2013-08-14 10:00 ` Vinod Koul
2013-08-15 15:22 ` Robert Jarzmik
2013-08-15 15:30 ` Daniel Mack
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