From: Mark Brown <broonie@opensource.wolfsonmicro.com>
To: Lars-Peter Clausen <lars@metafoo.de>
Cc: alsa-devel@alsa-project.org,
Russell King - ARM Linux <linux@arm.linux.org.uk>,
Vinod Koul <vinod.koul@intel.com>,
Sebastien Guiriec <s-guiriec@ti.com>,
Markus Pargmann <mpa@pengutronix.de>,
Shawn Guo <shawn.guo@linaro.org>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 0/2] ASoC: dmaengine_pcm: support generic DMA binding users
Date: Fri, 22 Mar 2013 12:48:00 +0100 [thread overview]
Message-ID: <20130322114759.GM22890@opensource.wolfsonmicro.com> (raw)
In-Reply-To: <514C43B4.1040403@metafoo.de>
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On Fri, Mar 22, 2013 at 12:42:44PM +0100, Lars-Peter Clausen wrote:
> On 03/22/2013 12:28 PM, Mark Brown wrote:
> > We need support for both cyclic and non-cyclic devices, one doesn't
> > preclude the other and both kinds of hardware exist. Cyclic is much
> > more common and generally more desirable but that doesn't mean that
> > hardware designers always provide it.
> The idea was to only have support for the cyclic dmaengine API in the ASoC
> PCM driver and deal with the emulation of cyclic transfers for hardware,
> which does not implement it, at the dmaengine layer.
Perhaps I'm misremembering but I thought there was pushback on that on
the basis that there are few if any other users of cyclic DMA so nobody
else cares or wants to deal with the hassle? A quick grep seems not to
turn up any other users.
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From: broonie@opensource.wolfsonmicro.com (Mark Brown)
To: linux-arm-kernel@lists.infradead.org
Subject: [alsa-devel] [PATCH 0/2] ASoC: dmaengine_pcm: support generic DMA binding users
Date: Fri, 22 Mar 2013 12:48:00 +0100 [thread overview]
Message-ID: <20130322114759.GM22890@opensource.wolfsonmicro.com> (raw)
In-Reply-To: <514C43B4.1040403@metafoo.de>
On Fri, Mar 22, 2013 at 12:42:44PM +0100, Lars-Peter Clausen wrote:
> On 03/22/2013 12:28 PM, Mark Brown wrote:
> > We need support for both cyclic and non-cyclic devices, one doesn't
> > preclude the other and both kinds of hardware exist. Cyclic is much
> > more common and generally more desirable but that doesn't mean that
> > hardware designers always provide it.
> The idea was to only have support for the cyclic dmaengine API in the ASoC
> PCM driver and deal with the emulation of cyclic transfers for hardware,
> which does not implement it, at the dmaengine layer.
Perhaps I'm misremembering but I thought there was pushback on that on
the basis that there are few if any other users of cyclic DMA so nobody
else cares or wants to deal with the hassle? A quick grep seems not to
turn up any other users.
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next prev parent reply other threads:[~2013-03-22 11:48 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-15 3:36 [PATCH 0/2] ASoC: dmaengine_pcm: support generic DMA binding users Shawn Guo
2013-03-15 3:36 ` Shawn Guo
2013-03-15 3:36 ` [PATCH 1/2] dmaengine: add const for name parameter Shawn Guo
2013-03-15 3:36 ` Shawn Guo
2013-03-15 8:53 ` Markus Pargmann
2013-03-15 8:53 ` Markus Pargmann
2013-03-21 9:47 ` Vinod Koul
2013-03-21 9:47 ` Vinod Koul
2013-03-21 13:10 ` Markus Pargmann
2013-03-21 13:10 ` Markus Pargmann
2013-03-21 12:54 ` Vinod Koul
2013-03-21 12:54 ` Vinod Koul
2013-03-21 14:45 ` [PATCH] DMA: of: const name fixup Markus Pargmann
2013-03-21 14:45 ` Markus Pargmann
2013-03-21 14:57 ` [PATCH 1/2] dmaengine: add const for name parameter Shawn Guo
2013-03-21 14:57 ` Shawn Guo
2013-04-02 17:51 ` Vinod Koul
2013-04-02 17:51 ` Vinod Koul
2013-04-02 19:47 ` Mark Brown
2013-04-02 19:47 ` Mark Brown
2013-03-15 3:36 ` [PATCH 2/2] ASoC: dmaengine_pcm: add snd_dmaengine_generic_pcm_open() Shawn Guo
2013-03-15 3:36 ` Shawn Guo
2013-03-15 10:00 ` Sebastien Guiriec
2013-03-15 10:00 ` Sebastien Guiriec
2013-03-21 9:57 ` Vinod Koul
2013-03-21 9:57 ` Vinod Koul
2013-03-21 14:53 ` Shawn Guo
2013-03-21 14:53 ` Shawn Guo
2013-03-22 8:07 ` Sebastien Guiriec
2013-03-22 8:07 ` Sebastien Guiriec
2013-03-22 8:39 ` Shawn Guo
2013-03-22 8:39 ` Shawn Guo
2013-03-21 2:39 ` [PATCH 0/2] ASoC: dmaengine_pcm: support generic DMA binding users Shawn Guo
2013-03-21 2:39 ` Shawn Guo
2013-03-21 15:06 ` Lars-Peter Clausen
2013-03-21 15:06 ` [alsa-devel] " Lars-Peter Clausen
2013-03-21 15:22 ` Mark Brown
2013-03-21 15:22 ` [alsa-devel] " Mark Brown
2013-03-21 16:26 ` Lars-Peter Clausen
2013-03-21 16:26 ` [alsa-devel] " Lars-Peter Clausen
2013-03-21 16:47 ` Mark Brown
2013-03-21 16:47 ` [alsa-devel] " Mark Brown
2013-03-22 11:30 ` Russell King - ARM Linux
2013-03-22 11:30 ` [alsa-devel] " Russell King - ARM Linux
2013-03-22 11:39 ` Lars-Peter Clausen
2013-03-22 11:39 ` [alsa-devel] " Lars-Peter Clausen
2013-03-22 11:17 ` Russell King - ARM Linux
2013-03-22 11:17 ` [alsa-devel] " Russell King - ARM Linux
2013-03-22 11:28 ` Mark Brown
2013-03-22 11:28 ` [alsa-devel] " Mark Brown
2013-03-22 11:42 ` Lars-Peter Clausen
2013-03-22 11:42 ` [alsa-devel] " Lars-Peter Clausen
2013-03-22 11:48 ` Mark Brown [this message]
2013-03-22 11:48 ` Mark Brown
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