linux-kernel - Re: [alsa-devel] [PATCH] ASoC: snd_dmaengine: add common api for pcm

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Message-ID: <4FEC4FA9.20004@nvidia.com>
Date:	Thu, 28 Jun 2012 18:05:53 +0530
From:	Laxman Dewangan <ldewangan@...dia.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
CC:	Lars-Peter Clausen <lars@...afoo.de>, Takashi Iwai <tiwai@...e.de>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	Stephen Warren <swarren@...dia.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"lrg@...com" <lrg@...com>,
	Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [alsa-devel] [PATCH] ASoC: snd_dmaengine: add common api for
 pcm_mmap

On Thursday 28 June 2012 05:58 PM, Mark Brown wrote:
> * PGP Signed by an unknown key
>
> On Thu, Jun 28, 2012 at 02:30:26PM +0200, Lars-Peter Clausen wrote:
>> On 06/28/2012 02:18 PM, Mark Brown wrote:
>>> 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.

So can we put the function snd_pcm_lib_writecombine_mmap() in the 
pcm_native.c and only export this api for ARM i.e.  under macro  #ifdef 
CONFIG_ARM so that ARM based SOCs like Tegra/epa3xx/mxs/spear can 
directly use that one?
Or, wait for this common API until all ARCH support it?
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