From: lars@metafoo.de (Lars-Peter Clausen)
To: linux-arm-kernel@lists.infradead.org
Subject: [alsa-devel] DMA engine API issue
Date: Thu, 24 Jul 2014 14:29:09 +0200 [thread overview]
Message-ID: <53D0FC15.6050601@metafoo.de> (raw)
In-Reply-To: <28702317.aD0C1Ga3DS@avalon>
On 07/23/2014 01:07 PM, Laurent Pinchart wrote:
[...]
> Let's start by answering the background question and updating the DMA engine
> API documentation once and for good : in which context are drivers allowed to
> call the prep, tx_submit and issue_pending functions ?
>
I think the expectation is that these functions can be called in any
context. Maybe what's missing is a way to tell the DMA engine driver to get
ready and that it is going to be used very soon. This could be done from the
sound devices open() callback.
- Lars
next prev parent reply other threads:[~2014-07-24 12:29 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1406032431-3807-1-git-send-email-laurent.pinchart+renesas@ideasonboard.com>
[not found] ` <87d2cwvmxa.wl%kuninori.morimoto.gx@gmail.com>
[not found] ` <3361994.F0HgAeJkR9@avalon>
2014-07-23 11:07 ` DMA engine API issue (was: [PATCH/RFC 0/5] R-Car Gen2 DMAC hardware descriptor list support) Laurent Pinchart
2014-07-24 0:46 ` Kuninori Morimoto
2014-07-24 1:35 ` Kuninori Morimoto
2014-07-24 4:53 ` Vinod Koul
2014-07-24 4:52 ` Vinod Koul
2014-08-01 8:51 ` Laurent Pinchart
2014-08-01 14:30 ` Russell King - ARM Linux
2014-08-01 17:09 ` Vinod Koul
2014-08-04 13:47 ` Geert Uytterhoeven
2014-08-04 17:00 ` Laurent Pinchart
2014-08-04 17:54 ` Russell King - ARM Linux
2014-08-05 23:19 ` Laurent Pinchart
2014-08-06 7:17 ` Geert Uytterhoeven
2014-08-06 11:04 ` Arnd Bergmann
2014-08-01 17:07 ` Vinod Koul
2014-08-04 16:50 ` Laurent Pinchart
2014-08-04 18:03 ` DMA engine API issue Lars-Peter Clausen
2014-08-04 18:32 ` Russell King - ARM Linux
2014-08-04 23:12 ` Laurent Pinchart
2014-08-05 16:56 ` DMA engine API issue (was: [PATCH/RFC 0/5] R-Car Gen2 DMAC hardware descriptor list support) Vinod Koul
2014-07-24 12:29 ` Lars-Peter Clausen [this message]
2014-07-24 12:51 ` Russell King - ARM Linux
2014-08-01 9:24 ` Laurent Pinchart
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