linux-kernel - Re: [alsa-devel] [PATCH 1/2] dma: Add a PAUSE

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Message-ID: <51A7A436.5040208@metafoo.de>
Date:	Thu, 30 May 2013 21:10:46 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Vinod Koul <vinod.koul@...ux.intel.com>
CC:	linux kernel <linux-kernel@...r.kernel.org>, vinod.koul@...el.com
Subject: Re: [alsa-devel] [PATCH 1/2] dma: Add a PAUSE_RESUME capability

On 05/30/2013 06:49 PM, Vinod Koul wrote:
> On Wed, 2013-05-29 at 13:42 +0200, Lars-Peter Clausen wrote:
>> Add a capability which allows dmaengine consumers to query whether a dmaengine
>> controller supports the DMA_PAUSE and DMA_RESUME commands. Sometimes a user of
>> the dmaengine API needs to know in advance if a channel will support
>> pause/resume. E.g. in ALSA the information whether it is possible to
>> pause/resume a audio stream or whether it is necessary to abort and restart the
>> stream is communicated to userspace so it can act accordingly.
> - This mail-list is not correct for this patch
> - use get_maintainer.pl, if you dont know but you already know!
> - always CC maintainers

Hm, I have no idea what happened with the Cc list. I might have hit the up key
one time to many after --dry-run, since this is the Cc list of a different
patch series.

> 
> the enum dma_transaction_type reports what kind of transactions DMA
> controller is capable of. This is not for capabilities of a given
> transaction type, so this approach is not right.

hm, ok.
> 
> Unfortunately, this is not supported by dmaengine atm. We had discussed
> this in last plumbers, and discussion with Matt was to add capability
> API (at least for slave usages). The work from Matt had reached a good
> point but unfortunately didn't reach its conclusion. [1]
> 
> Let me resurrect those patches and add the pause, resume query to it in
> more generic way

I've pinged Matt about these patches yesterday or so. He has been rather quite
lately, maybe he's been sucked into the Linaro blackhole.

- Lars

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