linux-kernel - Re: [PATCH 0/2] dma: edma: Allow to disable eDMA IRQ during cyclic transfer

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Date:	Mon, 28 Jul 2014 09:13:12 +0300
From:	Peter Ujfalusi <peter.ujfalusi@...com>
To:	<nsekhar@...com>, <joelf@...com>, <vinod.koul@...el.com>
CC:	<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<davinci-linux-open-source@...ux.davincidsp.com>,
	<dmaengine@...r.kernel.org>, <tglx@...utronix.de>
Subject: Re: [PATCH 0/2] dma: edma: Allow to disable eDMA IRQ during cyclic
 transfer

On 07/16/2014 03:29 PM, Peter Ujfalusi wrote:
> Hi,
> 
> After this series clients can ask to not receive notifications after each period.
> In this case we can disable the completion interrupt since the position reporting
> does not rely on it for cyclic mode.
> Patchset for ASoC part has been sent which allows users space to take adventage
> of SNDRV_PCM_INFO_NO_PERIOD_WAKEUP:
> [1] http://mailman.alsa-project.org/pipermail/alsa-devel/2014-July/078993.html

ping.

> When both series applied on top of linux-next:
> 
> # cache the audio file in memory
> cat some_music.mp3 > /dev/null
> # start PA
> pulseaudio -v
> # in another terminal, play the music via PA
> mplayer -ao pulse some_music.mp3
> # yet another terminal to monitor the interrupts
> watch cat /proc/interrupts
> # note the non increasing number of edma interrupts ;)
> 
> Regards,
> Peter
> ---
> Peter Ujfalusi (2):
>   dma: edma: Update caps->residue_granularity to match with reality
>   dma: edma: Support to suppress the period interrupts in cyclic mode
> 
>  drivers/dma/edma.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 


-- 
Péter
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