From: maxime.ripard@free-electrons.com (Maxime Ripard)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] Documentation: dmaengine: Add a documentation for the dma controller API
Date: Sat, 2 Aug 2014 21:06:15 +0200 [thread overview]
Message-ID: <20140802190615.GO3952@lukather> (raw)
In-Reply-To: <20140802151714.GB30282@n2100.arm.linux.org.uk>
On Sat, Aug 02, 2014 at 04:17:14PM +0100, Russell King - ARM Linux wrote:
> On Sat, Aug 02, 2014 at 04:49:25PM +0200, Maxime Ripard wrote:
> > In the case of the call to device_control, especially in the
> > DMA_SLAVE_CONFIG case, but that also applies to pause/resume, are the
> > changes supposed to be immediates or can they happen later?
>
> pause/resume are expected to operate synchronously on the channel.
> When asking for the channel to pause, the channel must be stopped
> before the call returns.
>
> In the case of channel configuration, that should have no effect on
> any previously queued transfer - in other words, changing the channel
> configuration only has an effect when subsequent transactions are
> prepared.
Ok, thanks!
--
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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next prev parent reply other threads:[~2014-08-02 19:06 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-30 16:03 [PATCH] Documentation: dmaengine: Add a documentation for the dma controller API Maxime Ripard
2014-07-30 16:06 ` Vinod Koul
2014-07-31 7:44 ` Maxime Ripard
2014-07-31 11:56 ` Vinod Koul
2014-07-31 16:23 ` Maxime Ripard
2014-08-01 17:13 ` Vinod Koul
2014-08-02 14:49 ` Maxime Ripard
2014-08-02 15:17 ` Russell King - ARM Linux
2014-08-02 19:06 ` Maxime Ripard [this message]
2014-08-05 16:25 ` Vinod Koul
2014-07-31 12:44 ` Lars-Peter Clausen
2014-07-31 16:13 ` Maxime Ripard
2014-07-31 16:54 ` Lars-Peter Clausen
2014-07-31 17:37 ` Maxime Ripard
2014-08-01 8:00 ` Lars-Peter Clausen
2014-08-01 8:57 ` Maxime Ripard
2014-08-01 17:15 ` Vinod Koul
2014-08-01 18:09 ` Lars-Peter Clausen
2014-08-02 15:13 ` Maxime Ripard
2014-08-04 7:16 ` Lars-Peter Clausen
2014-07-31 13:22 ` Russell King - ARM Linux
2014-07-31 16:41 ` Maxime Ripard
2014-08-01 14:53 ` Russell King - ARM Linux
2014-08-02 15:11 ` Maxime Ripard
2014-08-02 15:29 ` Russell King - ARM Linux
2014-08-02 19:05 ` Maxime Ripard
2014-08-01 17:22 ` Vinod Koul
2014-08-05 8:16 ` Geert Uytterhoeven
2014-08-14 8:53 ` Ludovic Desroches
2014-08-14 8:57 ` Russell King - ARM Linux
2014-08-19 13:45 ` Vinod Koul
2014-08-19 14:44 ` Russell King - ARM Linux
2014-08-19 14:57 ` Vinod Koul
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