linux-kernel - Re: [alsa-devel] [PATCH v3 00/15] ASoC: OMAP: Convert to use dmaengine

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Date:	Mon, 24 Sep 2012 18:36:01 -0500
From:	Ricardo Neri <ricardo.neri@...com>
To:	Peter Ujfalusi <peter.ujfalusi@...com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
CC:	Liam Girdwood <lrg@...com>, Tony Lindgren <tony@...mide.com>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Vinod Koul <vinod.koul@...el.com>, Dan Williams <djbw@...com>,
	Jarkko Nikula <jarkko.nikula@...mer.com>,
	<alsa-devel@...a-project.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Janusz Krzysztofik <jkrzyszt@....icnet.pl>,
	<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [alsa-devel] [PATCH v3 00/15] ASoC: OMAP: Convert to use dmaengine

Hi Peter, Mark,

On 09/14/2012 07:05 AM, Peter Ujfalusi wrote:
> Hello,
>
> Changes since v2:
> - As it has been discussed the no_wakeup parameter has been replaced with flags
>    for the dmaengine APIs
>
> Changes since v1:
> - Support for pause/resume for OMAP audio via dmaengine
> - dmaengine: support for NO_PERIOD_WAKEUP in cyclic mode
>   - OMAP to keep supporting NO_PERIOD_WAKEUP for audio
>   - Other plaforms can also try to enable this mode since we have now generic
>     interface to do so.
>
> This series will switch the OMAP audio to use dmaengine.
> The final patch which does the switch was based on Russell King's earlier patch.
>
> The first 10 patch is to prepare the OMAP audio drivers for a smooth change to
> dmaengine:
> - sDMA FRAME sync mode is removed and replaced with PACKET mode
> - dai drivers no longer need to configure sDMA sync mode
> - dai drivers does not need to specify the DMA word length - with the exception
>    of the omap-hdmi driver which requires 32bit word length regardless of the
>    audio format in use
> - the McPDM driver used (to my surprise) hackish way of getting the DMA channel
>    and address - via defines from some header files
>
> After the conversion OMAP audio support should have the same features as before,
> no regressions expected.
>
> I have tested the series on:
> - BeagleBoard (audio via McBSP):
>   - aplay/arecord. In element mode and in threshold mode with different period
>     sizes
>   - mplayer -ao alsa: for direct ALSA access
>   - mplayer -ao pulse: via PulseAudio to test NO_PERIOD_WAKEUP feature
> - OMAP4 Blaze (audio via McPDM and DMIC)
>   - aplay/arecord
>   - mplayer -ao alsa: for direct ALSA access
>   - mplayer -ao pulse: via PulseAudio to test NO_PERIOD_WAKEUP feature
>
> The patches has been generated against:
> git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-3.7
>
> Janusz: Can you retest this series on OMAP1 to be sure I have not broken it?
> Ricardo: Can you test the omap-hmdi if it is still working?

I tested these changes from Mark's for-3.7 branch. HDMI audio is working 
fine after applying patch 03. Such patch is missing in Mark's branch and 
this causes a build break with omap2plus_defconfig. Not sure if this is 
expected, Most likely not.

Tested-by: Ricardo Neri <ricardo.neri@...com>

Ricardo
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