From: Lars-Peter Clausen <lars@metafoo.de>
To: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: alsa-devel@alsa-project.org, swarren@nvidia.com,
Takashi Iwai <tiwai@suse.de>,
linux-kernel@vger.kernel.org,
Laxman Dewangan <ldewangan@nvidia.com>,
lrg@ti.com, Marek Szyprowski <m.szyprowski@samsung.com>
Subject: Re: [PATCH] ASoC: snd_dmaengine: add common api for pcm_mmap
Date: Thu, 28 Jun 2012 14:30:26 +0200 [thread overview]
Message-ID: <4FEC4E62.3020101@metafoo.de> (raw)
In-Reply-To: <20120628121816.GB21029@sirena.org.uk>
On 06/28/2012 02:18 PM, Mark Brown wrote:
> On Thu, Jun 28, 2012 at 02:15:38PM +0200, Takashi Iwai wrote:
>> Lars-Peter Clausen wrote:
>
>>> to the ALSA core. Now that there is a generic dma_mmap_writecombine it may
>>> make sense to integrate this with snd_pcm_lib_default_mmap.
>
>> Agreed.
>
>> Also, it must be portable. So far, only ARM has
>> dma_mmap_writecombine(), thus the build on other arch would fail as
>> is.
>
> Oh, dear - this means we don't actually have a generic API at all. Is
> there any effort being made to make this generally available?
Yes there is, and in fact in next/master there is generic
dma_mmap_writecombine. I'm not quite sure how it behaves on non ARM archs
though. But in theory it should fallback to a normal coherent mapping. Marek
did a lot of work on this, I've put him on Cc.
- Lars
WARNING: multiple messages have this Message-ID (diff)
From: Lars-Peter Clausen <lars@metafoo.de>
To: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Takashi Iwai <tiwai@suse.de>,
alsa-devel@alsa-project.org, swarren@nvidia.com,
linux-kernel@vger.kernel.org,
Laxman Dewangan <ldewangan@nvidia.com>,
lrg@ti.com, Marek Szyprowski <m.szyprowski@samsung.com>
Subject: Re: [alsa-devel] [PATCH] ASoC: snd_dmaengine: add common api for pcm_mmap
Date: Thu, 28 Jun 2012 14:30:26 +0200 [thread overview]
Message-ID: <4FEC4E62.3020101@metafoo.de> (raw)
In-Reply-To: <20120628121816.GB21029@sirena.org.uk>
On 06/28/2012 02:18 PM, Mark Brown wrote:
> On Thu, Jun 28, 2012 at 02:15:38PM +0200, Takashi Iwai wrote:
>> Lars-Peter Clausen wrote:
>
>>> to the ALSA core. Now that there is a generic dma_mmap_writecombine it may
>>> make sense to integrate this with snd_pcm_lib_default_mmap.
>
>> Agreed.
>
>> Also, it must be portable. So far, only ARM has
>> dma_mmap_writecombine(), thus the build on other arch would fail as
>> is.
>
> Oh, dear - this means we don't actually have a generic API at all. Is
> there any effort being made to make this generally available?
Yes there is, and in fact in next/master there is generic
dma_mmap_writecombine. I'm not quite sure how it behaves on non ARM archs
though. But in theory it should fallback to a normal coherent mapping. Marek
did a lot of work on this, I've put him on Cc.
- Lars
next prev parent reply other threads:[~2012-06-28 12:26 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-28 7:01 [PATCH] ASoC: snd_dmaengine: add common api for pcm_mmap Laxman Dewangan
2012-06-28 7:01 ` Laxman Dewangan
2012-06-28 10:51 ` Mark Brown
2012-06-28 10:51 ` Mark Brown
2012-06-28 11:56 ` Laxman Dewangan
2012-06-28 12:02 ` Mark Brown
2012-06-28 12:07 ` Laxman Dewangan
2012-06-28 12:44 ` Lars-Peter Clausen
2012-06-28 14:03 ` Takashi Iwai
2012-06-28 14:03 ` [alsa-devel] " Takashi Iwai
2012-06-28 11:09 ` Lars-Peter Clausen
2012-06-28 11:09 ` Lars-Peter Clausen
2012-06-28 12:15 ` Takashi Iwai
2012-06-28 12:18 ` Mark Brown
2012-06-28 12:18 ` [alsa-devel] " Mark Brown
2012-06-28 12:30 ` Lars-Peter Clausen [this message]
2012-06-28 12:30 ` Lars-Peter Clausen
2012-06-28 12:28 ` Mark Brown
2012-06-28 12:35 ` Laxman Dewangan
2012-06-28 12:57 ` Takashi Iwai
2012-06-28 12:57 ` [alsa-devel] " Takashi Iwai
2012-06-28 13:04 ` Laxman Dewangan
2012-06-28 13:28 ` Takashi Iwai
2012-06-28 13:28 ` [alsa-devel] " Takashi Iwai
2012-06-28 13:36 ` Laxman Dewangan
2012-06-28 13:51 ` Takashi Iwai
2012-06-28 14:00 ` Laxman Dewangan
2012-06-28 14:10 ` Takashi Iwai
2012-06-29 16:42 ` Lars-Peter Clausen
2012-06-29 16:42 ` [alsa-devel] " Lars-Peter Clausen
2012-07-02 12:50 ` Marek Szyprowski
2012-06-28 12:32 ` Clemens Ladisch
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