From: Lars-Peter Clausen <lars@metafoo.de>
To: Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
Kuninori Morimoto <kuninori.morimoto.gx@gmail.com>
Cc: Linux-ALSA <alsa-devel@alsa-project.org>,
linux-sh@vger.kernel.org, Vinod Koul <vinod.koul@intel.com>,
Magnus Damm <magnus.damm@gmail.com>,
dmaengine@vger.kernel.org,
Maxime Ripard <maxime.ripard@free-electrons.com>,
linux-arm-kernel@lists.infradead.org
Subject: Re: 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
WARNING: multiple messages have this Message-ID (diff)
From: Lars-Peter Clausen <lars@metafoo.de>
To: Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
Kuninori Morimoto <kuninori.morimoto.gx@gmail.com>
Cc: Linux-ALSA <alsa-devel@alsa-project.org>,
linux-sh@vger.kernel.org, Vinod Koul <vinod.koul@intel.com>,
Magnus Damm <magnus.damm@gmail.com>,
dmaengine@vger.kernel.org,
Maxime Ripard <maxime.ripard@free-electrons.com>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [alsa-devel] DMA engine API issue
Date: Thu, 24 Jul 2014 12:29:09 +0000 [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
WARNING: multiple messages have this Message-ID (diff)
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: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-22 12:33 [PATCH/RFC 0/5] R-Car Gen2 DMAC hardware descriptor list support Laurent Pinchart
2014-07-23 2:17 ` Kuninori Morimoto
2014-07-23 10:28 ` Laurent Pinchart
2014-07-23 10:28 ` Laurent Pinchart
2014-07-23 11:07 ` DMA engine API issue (was: [PATCH/RFC 0/5] R-Car Gen2 DMAC hardware descriptor list support) Laurent Pinchart
2014-07-23 11:07 ` Laurent Pinchart
2014-07-23 11:07 ` Laurent Pinchart
2014-07-24 0:46 ` Kuninori Morimoto
2014-07-24 0:46 ` Kuninori Morimoto
2014-07-24 0:46 ` Kuninori Morimoto
2014-07-24 1:35 ` Kuninori Morimoto
2014-07-24 1:35 ` Kuninori Morimoto
2014-07-24 1:35 ` Kuninori Morimoto
2014-07-24 4:53 ` Vinod Koul
2014-07-24 4:59 ` Vinod Koul
2014-07-24 4:53 ` Vinod Koul
2014-07-24 4:52 ` Vinod Koul
2014-07-24 4:58 ` Vinod Koul
2014-07-24 4:52 ` Vinod Koul
2014-08-01 8:51 ` Laurent Pinchart
2014-08-01 8:51 ` Laurent Pinchart
2014-08-01 8:51 ` Laurent Pinchart
2014-08-01 14:30 ` Russell King - ARM Linux
2014-08-01 14:30 ` Russell King - ARM Linux
2014-08-01 14:30 ` Russell King - ARM Linux
2014-08-01 17:09 ` Vinod Koul
2014-08-01 17:21 ` Vinod Koul
2014-08-01 17:09 ` Vinod Koul
2014-08-04 13:47 ` Geert Uytterhoeven
2014-08-04 13:47 ` Geert Uytterhoeven
2014-08-04 13:47 ` Geert Uytterhoeven
2014-08-04 17:00 ` Laurent Pinchart
2014-08-04 17:00 ` Laurent Pinchart
2014-08-04 17:00 ` Laurent Pinchart
2014-08-04 17:54 ` Russell King - ARM Linux
2014-08-04 17:54 ` Russell King - ARM Linux
2014-08-04 17:54 ` Russell King - ARM Linux
2014-08-05 23:19 ` Laurent Pinchart
2014-08-05 23:19 ` Laurent Pinchart
2014-08-05 23:19 ` Laurent Pinchart
2014-08-06 7:17 ` Geert Uytterhoeven
2014-08-06 7:17 ` Geert Uytterhoeven
2014-08-06 7:17 ` Geert Uytterhoeven
2014-08-06 11:04 ` Arnd Bergmann
2014-08-06 11:04 ` Arnd Bergmann
2014-08-06 11:04 ` Arnd Bergmann
2014-08-01 17:07 ` Vinod Koul
2014-08-01 17:19 ` Vinod Koul
2014-08-01 17:07 ` Vinod Koul
2014-08-04 16:50 ` Laurent Pinchart
2014-08-04 16:50 ` Laurent Pinchart
2014-08-04 16:50 ` Laurent Pinchart
2014-08-04 18:03 ` DMA engine API issue Lars-Peter Clausen
2014-08-04 18:03 ` Lars-Peter Clausen
2014-08-04 18:03 ` Lars-Peter Clausen
2014-08-04 18:32 ` Russell King - ARM Linux
2014-08-04 18:32 ` Russell King - ARM Linux
2014-08-04 18:32 ` Russell King - ARM Linux
2014-08-04 23:12 ` Laurent Pinchart
2014-08-04 23:12 ` Laurent Pinchart
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
2014-08-05 17:08 ` Vinod Koul
2014-08-05 16:56 ` Vinod Koul
2014-07-24 12:29 ` Lars-Peter Clausen [this message]
2014-07-24 12:29 ` [alsa-devel] DMA engine API issue Lars-Peter Clausen
2014-07-24 12:29 ` Lars-Peter Clausen
2014-07-24 12:51 ` DMA engine API issue (was: [PATCH/RFC 0/5] R-Car Gen2 DMAC hardware descriptor list support) Russell King - ARM Linux
2014-07-24 12:51 ` Russell King - ARM Linux
2014-07-24 12:51 ` Russell King - ARM Linux
2014-08-01 9:24 ` Laurent Pinchart
2014-08-01 9:24 ` Laurent Pinchart
2014-08-01 9:24 ` Laurent Pinchart
2014-07-23 9:48 ` [PATCH/RFC 0/5] R-Car Gen2 DMAC hardware descriptor list support Laurent Pinchart
2014-07-23 23:56 ` Kuninori Morimoto
2014-07-24 8:51 ` [PATCH] ASoC: rsnd: fixup dai remove callback operation Kuninori Morimoto
2014-07-25 17:50 ` Mark Brown
2014-07-24 0:12 ` [PATCH/RFC 0/5] R-Car Gen2 DMAC hardware descriptor list support Laurent Pinchart
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