From: Lars-Peter Clausen <lars@metafoo.de>
To: Raymond Yau <superquad.vortex2@gmail.com>
Cc: ALSA Development Mailing List <alsa-devel@alsa-project.org>,
Takashi Iwai <tiwai@suse.de>,
clemens@ladisch.de, Tanu Kaskinen <tanu.kaskinen@linux.intel.com>,
Arun Raghavan <arun@accosted.net>,
David Henningsson <david.henningsson@canonical.com>
Subject: Re: PulseAudio and SNDRV_PCM_INFO_BATCH
Date: Mon, 22 Jun 2015 08:43:03 +0200 [thread overview]
Message-ID: <5587AE77.1020709@metafoo.de> (raw)
In-Reply-To: <CAN8ccibPTkiayx_9ETOwjw1dSF+UPsxjgcqWJR+mm149c69WBg@mail.gmail.com>
On 06/22/2015 04:35 AM, Raymond Yau wrote:
>
> >
> > DMA_RESIDUE_GRANULARITY_BURST means it can report the position with a
> granularity of a few samples. Typically half the audio FIFO size.
> >
> >
>
> How many soc driver/platform dma engine support DMA_RESIDUE_GRANULARITY_BURST ?
Not sure, maybe half of them. But most of the time it is a software
restriction rather than a hardware restriction and more and more drivers are
supporting it.
>
> Are all soc audio driver use cyclic dma ?
I'm not sure I understand the question. All audio drivers use some kind of
cyclic DMA. ASoC platforms which do not have a dedicated audio DMA typically
use dmaengine for this, while others which have dedicated audio DMA do the
DMA as part of the audio driver.
next prev parent reply other threads:[~2015-06-22 6:43 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-12 12:29 PulseAudio and SNDRV_PCM_INFO_BATCH Arun Raghavan
2015-06-12 12:32 ` Arun Raghavan
2015-06-12 13:43 ` Alexander E. Patrakov
2015-06-12 13:57 ` Alexander E. Patrakov
2015-06-17 3:04 ` Raymond Yau
2015-06-17 3:38 ` Alexander E. Patrakov
2015-06-15 3:42 ` Raymond Yau
2015-06-15 8:03 ` Lars-Peter Clausen
2015-06-15 11:39 ` Raymond Yau
2015-06-15 12:01 ` Lars-Peter Clausen
2015-06-15 13:34 ` Raymond Yau
2015-06-15 14:16 ` Lars-Peter Clausen
2015-06-16 2:33 ` Raymond Yau
2015-06-17 8:27 ` Lars-Peter Clausen
2015-06-17 9:19 ` Takashi Iwai
2015-06-17 15:09 ` David Henningsson
2015-06-17 16:48 ` Alexander E. Patrakov
2015-06-18 3:15 ` Raymond Yau
2015-06-19 11:19 ` Alexander E. Patrakov
2015-06-19 1:17 ` Raymond Yau
2015-06-19 11:32 ` Takashi Iwai
2015-06-20 3:24 ` Raymond Yau
2015-06-20 6:17 ` Raymond Yau
2015-06-22 2:35 ` Raymond Yau
2015-06-22 6:43 ` Lars-Peter Clausen [this message]
2015-06-22 7:49 ` Raymond Yau
2015-06-22 9:41 ` Clemens Ladisch
2015-06-22 11:54 ` Raymond Yau
2015-06-22 12:10 ` Alexander E. Patrakov
2015-06-22 12:34 ` Raymond Yau
2015-06-22 12:49 ` Alexander E. Patrakov
2015-06-22 15:50 ` Raymond Yau
2015-06-22 16:28 ` Alexander E. Patrakov
2015-06-24 5:51 ` Raymond Yau
2015-06-22 22:52 ` Takashi Sakamoto
2015-06-27 15:28 ` Alexander E. Patrakov
2015-06-27 17:15 ` Clemens Ladisch
2015-06-27 17:58 ` Alexander E. Patrakov
2015-06-28 2:09 ` Raymond Yau
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