From: Mark Brown <broonie@opensource.wolfsonmicro.com>
To: Peter Ujfalusi <peter.ujfalusi@nokia.com>
Cc: tiwai@suse.de, alsa-devel@alsa-project.org, lrg@slimlogic.co.uk
Subject: Re: [RFC 0/4] FIFO caused playback delay (latency) handling in soc
Date: Tue, 2 Mar 2010 13:53:01 +0000 [thread overview]
Message-ID: <20100302135301.GG10658@sirena.org.uk> (raw)
In-Reply-To: <1267537191-25254-1-git-send-email-peter.ujfalusi@nokia.com>
On Tue, Mar 02, 2010 at 03:39:47PM +0200, Peter Ujfalusi wrote:
> There has been discussion in alsa-devel in this subject several times,
> but no actual patches has been sent.
Well, it's never really been discussed in an ASoC context - most of the
interest has been on the PC audio side. This is the first interest in
it from the embedded side.
This is pretty much what I would have implemented, aside from the
playback/capture thing I mentioned the only other thing that I'd suggest
is also adding a callback for the platform driver. Many CPUs actually
introduce the latency in the DMA stream rather than in the interface,
for example by filling up a SRAM buffer as DaVinci currently does, and
it's more natural for them to keep track of the latency introduced in
the code that's managing the DMA. For devices where the buffer is on
the interface the DAI makes sense.
next prev parent reply other threads:[~2010-03-02 13:53 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-02 13:39 [RFC 0/4] FIFO caused playback delay (latency) handling in soc Peter Ujfalusi
2010-03-02 13:39 ` [RFC 1/4] ASoC: core: soc level wrapper for pcm_pointer callback Peter Ujfalusi
2010-03-02 13:39 ` [RFC 2/4] ASoC: core: Add delay operation to snd_soc_dai_ops Peter Ujfalusi
2010-03-02 13:45 ` Mark Brown
2010-03-02 13:49 ` Peter Ujfalusi
2010-03-02 13:54 ` Mark Brown
2010-03-02 13:39 ` [RFC 3/4] OMAP3: McBSP: Add interface for transmit FIFO state query Peter Ujfalusi
2010-03-02 13:45 ` Mark Brown
2010-03-02 13:52 ` Eero Nurkkala
2010-03-02 13:58 ` Liam Girdwood
2010-03-02 14:02 ` Peter Ujfalusi
2010-03-02 14:06 ` Jarkko Nikula
2010-03-03 6:07 ` Eero Nurkkala
2010-03-03 7:03 ` Jarkko Nikula
2010-03-03 10:02 ` Peter Ujfalusi
2010-03-03 10:07 ` Peter Ujfalusi
2010-03-03 14:18 ` Jarkko Nikula
2010-03-03 15:01 ` Peter Ujfalusi
2010-03-04 7:30 ` Peter Ujfalusi
2010-03-03 19:00 ` ext-Eero.Nurkkala
2010-03-03 19:07 ` ext-Eero.Nurkkala
2010-03-04 7:53 ` Peter Ujfalusi
2010-03-04 8:09 ` Peter Ujfalusi
2010-03-04 8:46 ` Eero Nurkkala
2010-03-02 13:39 ` [RFC 4/4] ASoC: OMAP3: Report delay on playback caused by the internal FIFO Peter Ujfalusi
2010-03-02 13:47 ` Mark Brown
2010-03-02 13:52 ` Peter Ujfalusi
2010-03-02 14:06 ` Mark Brown
2010-03-02 13:53 ` Mark Brown [this message]
2010-03-02 23:29 ` [RFC 0/4] FIFO caused playback delay (latency) handling in soc Raymond Yau
2010-03-03 10:03 ` Mark Brown
2010-03-05 1:19 Raymond Yau
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