From: Jarkko Nikula <jhnikula@gmail.com>
To: Liam Girdwood <lrg@slimlogic.co.uk>
Cc: Tony Lindgren <tony@atomide.com>,
alsa-devel@alsa-project.org, linux-omap@vger.kernel.org,
Peter Ujfalusi <peter.ujfalusi@nokia.com>,
Mark Brown <broonie@opensource.wolfsonmicro.com>
Subject: Re: [PATCH 0/4] McBSP smart idle and DMA op mode updates for ASoC
Date: Wed, 19 May 2010 08:13:25 +0300 [thread overview]
Message-ID: <20100519081325.6e341075.jhnikula@gmail.com> (raw)
In-Reply-To: <1274213594-26554-1-git-send-email-lrg@slimlogic.co.uk>
On Tue, 18 May 2010 21:13:10 +0100
Liam Girdwood <lrg@slimlogic.co.uk> wrote:
> I've also added a patch to remove the mcbsp DMA op mode sysfs set functionality.
> I think DMA op mode is very specific to the mcbsp client driver _only_ and
> shouldn't really be changed by userspace. Please let me know if you use this
> feature and I'll drop this patch.
>
I've used to say that the DMA op mode is more like use-case not machine
specific but I'm not sure is my point valid onemore. I've used to think
that low-latency processing would need accurate DMA pointer (op
mode == element) while mp3 playback would need low power consumption
(op mode == threshold).
Peter: what's the status today how well can we do low-latency
processing with threshold mode? IRCC, with your FIFO delay query
patches, can we estimate the DMA pointer position with enough accuracy?
--
Jarkko
next prev parent reply other threads:[~2010-05-19 5:13 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-18 20:13 [PATCH 0/4] McBSP smart idle and DMA op mode updates for ASoC Liam Girdwood
2010-05-18 20:13 ` [PATCH 1/4] OMAP: mcbsp - add omap_mcbsp_set_dma_op_mode() Liam Girdwood
2010-05-19 6:13 ` Jarkko Nikula
2010-05-19 10:50 ` Eduardo Valentin
2010-05-19 11:30 ` Liam Girdwood
2010-05-18 20:13 ` [PATCH 2/4] OMAP: mcbsp - add smart idle configuration API Liam Girdwood
2010-05-18 20:42 ` Nishanth Menon
2010-05-18 23:01 ` [alsa-devel] " Kevin Hilman
2010-05-19 10:43 ` Liam Girdwood
2010-05-19 12:15 ` Peter Ujfalusi
2010-05-19 15:33 ` Kevin Hilman
2010-05-19 5:22 ` Jarkko Nikula
2010-05-19 10:46 ` Eduardo Valentin
2010-05-19 11:21 ` [alsa-devel] " Liam Girdwood
2010-05-19 11:31 ` Eduardo Valentin
2010-05-18 20:13 ` [PATCH 3/4] ASoC: mcbsp - add machine threshold callback Liam Girdwood
2010-05-18 20:38 ` Mark Brown
2010-05-18 20:56 ` Candelaria Villarreal, Jorge
2010-05-19 5:45 ` Jarkko Nikula
2010-05-19 9:37 ` [alsa-devel] " Liam Girdwood
2010-05-18 20:13 ` [PATCH 4/4] OMAP: mcbsp - remove sysfs set for DMA op mode Liam Girdwood
2010-05-19 5:13 ` Jarkko Nikula [this message]
2010-05-19 8:31 ` [PATCH 0/4] McBSP smart idle and DMA op mode updates for ASoC Peter Ujfalusi
2010-05-19 8:37 ` Peter Ujfalusi
2010-05-19 10:52 ` Eduardo Valentin
2010-05-19 11:36 ` Peter Ujfalusi
2010-05-19 11:46 ` Eduardo Valentin
2010-05-19 12:09 ` Peter Ujfalusi
2010-05-19 10:42 ` Eduardo Valentin
2010-05-19 11:07 ` Liam Girdwood
2010-05-19 11:28 ` Eduardo Valentin
2010-05-19 12:27 ` Peter Ujfalusi
2010-05-19 14:50 ` Jarkko Nikula
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