From: Clemens Ladisch <clemens@ladisch.de>
To: Joel Fernandes <joelf@ti.com>
Cc: Mike Looijmans <mike.looijmans@topic.nl>,
alsa-devel@alsa-project.org, lars@metafoo.de
Subject: Re: Query on Audio DMA using DMAEngine
Date: Thu, 04 Jul 2013 13:00:30 +0200 [thread overview]
Message-ID: <51D555CE.7040807@ladisch.de> (raw)
In-Reply-To: <51D22CAE.2020302@ti.com>
Joel Fernandes wrote:
> On 07/01/2013 01:10 AM, Mike Looijmans wrote:
>> The trouble with the current davinci driver is that the IRQ handler has a
>> real-time requirement, it must finish before the next DMA block completes. This
>> causes most of the buffer overruns on heavily loaded systems.
>
> But how do you get around not calling snd_pcm_period_elapsed in a time-sensitive
> fashion?
To ensure that other stuff is completed first, snd_pcm_period_elapsed()
could be called later from a tasklet. (snd_pcm_period_elapsed() calls
the .pointer callback, which could be another source of delays depending
on how much hardware accesses it does.)
Regards,
Clemens
next prev parent reply other threads:[~2013-07-04 11:00 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <083BC63EECB6FD41B8E81CF7FD87CC0F2E4F1488@DLEE08.ent.ti.com>
2013-06-30 12:06 ` Query on Audio DMA using DMAEngine Lars-Peter Clausen
2013-07-01 6:10 ` Mike Looijmans
2013-07-02 1:28 ` Joel Fernandes
2013-07-02 6:02 ` Mike Looijmans
2013-07-02 12:16 ` Mark Brown
2013-07-02 13:30 ` Mike Looijmans
2013-07-02 14:58 ` Mark Brown
2013-07-04 11:00 ` Clemens Ladisch [this message]
2013-07-02 3:33 ` Joel Fernandes
2013-07-02 5:50 ` Mike Looijmans
2013-07-02 12:13 ` Mark Brown
2013-07-02 13:40 ` Mike Looijmans
2013-07-03 9:09 ` Lars-Peter Clausen
2013-07-03 9:43 ` Mark Brown
2013-07-03 13:17 ` Mike Looijmans
[not found] ` <51D4245F.8070307-Oq418RWZeHk@public.gmane.org>
2013-07-03 19:56 ` Joel Fernandes
[not found] ` <20130703094307.GE27646-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2013-07-03 17:55 ` [alsa-devel] " Joel Fernandes
[not found] ` <51D46598.6070005-l0cyMroinI0@public.gmane.org>
2013-07-03 18:12 ` Mark Brown
2013-07-04 5:56 ` Mike Looijmans
2013-07-04 10:49 ` Mark Brown
2013-07-04 6:06 ` [alsa-devel] " Mike Looijmans
2013-07-04 10:53 ` Mark Brown
[not found] ` <51D510EA.1030809-Oq418RWZeHk@public.gmane.org>
2013-07-04 10:59 ` [alsa-devel] " Sekhar Nori
2013-08-14 4:30 ` Joel Fernandes
2013-08-14 4:53 ` Joel Fernandes
2013-08-14 14:10 ` Mike Looijmans
2013-08-14 12:06 ` Mark Brown
2013-07-02 1:04 ` Joel Fernandes
2013-07-03 9:07 ` Lars-Peter Clausen
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