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From: Lars-Peter Clausen <lars@metafoo.de>
To: Stephen Warren <swarren@wwwdotorg.org>,
	Laxman Dewangan <ldewangan@nvidia.com>
Cc: Linux-ALSA <alsa-devel@alsa-project.org>
Subject: ASoC: tegra: Does the PCM_TRIGGER_{PAUSE, RESUME} emulation really work?
Date: Fri, 22 Mar 2013 17:26:00 +0100	[thread overview]
Message-ID: <514C8618.9070307@metafoo.de> (raw)

Hi,

The tegra pcm driver tries to emulate SNDRV_PCM_TRIGGER_PAUSE and
SNDRV_PCM_TRIGGER_RESUME. By passing SNDRV_PCM_TRIGGER_START and
SNDRV_PCM_TRIGGER_STOP to snd_dmaengine_pcm_trigger. But does this really
work? The old non-dmaengine based driver implemented this properly. I'd
reset the dma position pointer for SNDRV_PCM_TRIGGER_START, but keep it
where it was for SNDRV_PCM_TRIGGER_RESUME. But as far as I can see with the
dmaengine based driver the pointer always gets reset to 0 for both
SNDRV_PCM_TRIGGER_START and SNDRV_PCM_TRIGGER_RESUME.

- Lars

             reply	other threads:[~2013-03-22 16:23 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-03-22 16:26 Lars-Peter Clausen [this message]
2013-03-22 23:35 ` ASoC: tegra: Does the PCM_TRIGGER_{PAUSE, RESUME} emulation really work? Stephen Warren
2013-03-23 10:00   ` Lars-Peter Clausen
     [not found]   ` <514DAB42.6090601@nvidia.com>
2013-03-23 13:29     ` Lars-Peter Clausen
     [not found]       ` <514DADE9.50402@nvidia.com>
2013-03-23 13:36         ` Lars-Peter Clausen

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