From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: Cyclic DMA - callback properties and tx_status residue
Date: Tue, 15 May 2012 08:37:12 +0100 [thread overview]
Message-ID: <20120515073712.GE10453@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <1337058446.16185.5382.camel@vkoul-udesk3>
On Tue, May 15, 2012 at 10:37:26AM +0530, Vinod Koul wrote:
> On Fri, 2012-05-11 at 15:07 +0100, Russell King - ARM Linux wrote:
> > On Thu, May 10, 2012 at 04:31:15PM +0530, Vinod Koul wrote:
> > > This should not be in ASoC library. The driver should be able to detect
> > > if a tasklet was called for many dma completions and notify the client
> > > (soc-lib) accordingly.
> >
> > No. Think about the cyclic case. How do you correctly record how many
> > 'periods' have completed so that when your tasklet eventually gets called,
> > you call its callback the correct number of times?
> In ISR you can find which descriptors the interupt is for and then use
> this info in tasklet.
What descriptors? With cyclic DMA you only have one descriptor. Your
DMA engine may only need to be programmed once to do this too.
next prev parent reply other threads:[~2012-05-15 7:37 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-02 14:45 Cyclic DMA - callback properties and tx_status residue Russell King - ARM Linux
2012-05-02 16:01 ` Vinod Koul
2012-05-02 16:27 ` Russell King - ARM Linux
2012-05-04 12:26 ` Russell King - ARM Linux
2012-05-04 12:45 ` Vinod Koul
2012-05-10 22:54 ` Russell King - ARM Linux
2012-05-11 3:00 ` Vinod Koul
2012-05-11 12:24 ` Linus Walleij
2012-05-11 13:03 ` Russell King - ARM Linux
2012-05-15 5:02 ` Vinod Koul
2012-05-09 9:27 ` Linus Walleij
2012-05-09 9:33 ` Russell King - ARM Linux
2012-05-09 11:16 ` Mark Brown
2012-05-09 12:19 ` Russell King - ARM Linux
2012-05-09 12:49 ` Lars-Peter Clausen
2012-05-09 14:03 ` Mark Brown
2012-05-10 3:44 ` Vinod Koul
2012-05-10 7:44 ` Russell King - ARM Linux
2012-05-10 10:58 ` Vinod Koul
2012-05-10 13:19 ` Huang Shijie
2012-05-10 14:54 ` Vinod Koul
2012-05-10 9:42 ` Mark Brown
2012-05-10 11:01 ` Vinod Koul
2012-05-11 14:02 ` Mark Brown
2012-05-11 14:07 ` Russell King - ARM Linux
2012-05-11 14:18 ` Mark Brown
2012-05-11 14:29 ` Russell King - ARM Linux
2012-05-11 15:07 ` Mark Brown
2012-05-15 5:07 ` Vinod Koul
2012-05-15 7:37 ` Russell King - ARM Linux [this message]
2012-05-15 8:58 ` Vinod Koul
2012-05-09 12:35 ` Lars-Peter Clausen
2012-05-07 10:40 ` Mark Brown
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