From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Peter Ujfalusi <peter.ujfalusi@ti.com>
Cc: Vinod Koul <vinod.koul@intel.com>, Dan Williams <djbw@fb.com>,
Tony Lindgren <tony@atomide.com>,
Jarkko Nikula <jarkko.nikula@bitmer.com>,
Santosh Shilimkar <santosh.shilimkar@ti.com>,
Felipe Balbi <balbi@ti.com>,
linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Peter Meerwald <pmeerw@pmeerw.net>
Subject: Re: [RFC v2] dmaengine: omap-dma: Start DMA without delay for cyclic channels
Date: Mon, 8 Apr 2013 18:09:56 +0100 [thread overview]
Message-ID: <20130408170956.GX30923@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <51626D88.8020809@ti.com>
On Mon, Apr 08, 2013 at 09:11:04AM +0200, Peter Ujfalusi wrote:
> Russell,
>
> On 04/03/2013 01:17 PM, Peter Ujfalusi wrote:
> > cyclic DMA is only used by audio which needs DMA to be started without a
> > delay.
> > If the DMA for audio is started using the tasklet we experience random
> > channel switch (to be more precise: channel shift).
> >
> > Reported-by: Peter Meerwald <pmeerw@pmeerw.net>
> > Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
> > ---
> > Hi Russell,
> >
> > Instead of removing the tasklet we can identify the DMA channel used by audio
> > based on the cyclic flag of the channel.
> > I think this can be used as a short term solution to fix the audio channel shift
> > issue and later when we have the dynamic DMA channel allocation we can adjust
> > the code.
>
> Could you, please look at this patch?
Now that I'm back from a short 4 day break, then yes, and the answer is
that it's fine. Who's handling the patch?
next prev parent reply other threads:[~2013-04-08 17:10 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-03 11:17 Peter Ujfalusi
2013-04-03 11:24 ` Santosh Shilimkar
2013-04-03 11:52 ` Peter Ujfalusi
2013-04-03 12:00 ` Santosh Shilimkar
2013-04-08 7:11 ` Peter Ujfalusi
2013-04-08 17:09 ` Russell King - ARM Linux [this message]
2013-04-08 17:15 ` Tony Lindgren
2013-04-09 6:52 ` Santosh Shilimkar
2013-04-09 7:19 ` Peter Ujfalusi
2013-04-09 7:26 ` Vinod Koul
2013-04-09 10:20 ` Peter Ujfalusi
2013-04-09 7:19 ` Peter Ujfalusi
2013-04-09 7:21 ` Peter Ujfalusi
2013-04-09 13:54 ` Russell King - ARM Linux
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