From: Mark Brown <broonie@opensource.wolfsonmicro.com>
To: Grant Likely <grant.likely@secretlab.ca>
Cc: alsa-devel@alsa-project.org, linuxppc-dev@lists.ozlabs.org,
lrg@slimlogic.co.uk
Subject: Re: [PATCH 6/6] ASoC/mpc5200: Add fudge factor to value reported by .pointer()
Date: Sat, 7 Nov 2009 18:11:54 +0000 [thread overview]
Message-ID: <20091107181153.GA31789@sirena.org.uk> (raw)
In-Reply-To: <20091107083448.18908.80366.stgit@angua>
On Sat, Nov 07, 2009 at 01:34:55AM -0700, Grant Likely wrote:
> ALSA playback seems to be more reliable if the .pointer() hook reports
> a value slightly into the period, rather than right on the period
> boundary. This patch adds a fudge factor of 1/4 the period size
> to better estimate the actual position of the DMA engine in the
> audio buffer.
It occurs to me that in terms of dealing with what's going on here this
probably is achieving exactly the same effect as Jon's code in that it
tells ALSA that things are a bit ahead of where the buffer started.
next prev parent reply other threads:[~2009-11-07 18:12 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-07 8:33 [PATCH 0/6] Fixups to MPC5200 ASoC drivers Grant Likely
2009-11-07 8:33 ` [PATCH 1/6] ASoC/mpc5200: Track DMA position by period number instead of bytes Grant Likely
2009-11-07 10:35 ` Liam Girdwood
2009-11-07 16:50 ` Grant Likely
2009-11-07 8:34 ` [PATCH 2/6] ASoC/mpc5200: get rid of the appl_ptr tracking nonsense Grant Likely
2009-11-07 12:51 ` Jon Smirl
2009-11-07 13:04 ` Jon Smirl
2009-11-07 18:53 ` Grant Likely
2009-11-07 18:51 ` Grant Likely
2009-11-07 20:12 ` Mark Brown
2009-11-11 16:38 ` [alsa-devel] " Jon Smirl
2009-11-11 18:37 ` Mark Brown
2009-11-11 19:24 ` Grant Likely
2009-11-11 20:03 ` Mark Brown
2009-11-11 21:34 ` Jon Smirl
2009-11-11 21:57 ` [alsa-devel] " Grant Likely
2009-11-11 23:13 ` Jon Smirl
2009-11-12 12:10 ` Mark Brown
2009-11-11 21:26 ` Jon Smirl
2009-11-07 8:34 ` [PATCH 3/6] ASoC/mpc5200: Improve printk debug output for trigger Grant Likely
2009-11-07 8:34 ` [PATCH 4/6] ASoC/mpc5200: add to_psc_dma_stream() helper Grant Likely
2009-11-07 12:33 ` Mark Brown
2009-11-07 8:34 ` [PATCH 5/6] ASoC/mpc5200: fix enable/disable of AC97 slots Grant Likely
2009-11-07 8:34 ` [PATCH 6/6] ASoC/mpc5200: Add fudge factor to value reported by .pointer() Grant Likely
2009-11-07 18:11 ` Mark Brown [this message]
2009-11-07 18:19 ` Grant Likely
2009-11-07 19:33 ` Mark Brown
2009-11-07 19:46 ` Grant Likely
2009-11-07 12:57 ` [PATCH 0/6] Fixups to MPC5200 ASoC drivers Mark Brown
2009-11-07 16:52 ` Grant Likely
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