linux-kernel - Re: [PATCH 1/5] ARM: tegra: config: enable dmaengine based APB DMA driver

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Date:	Fri, 17 Aug 2012 09:17:55 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Laxman Dewangan <ldewangan@...dia.com>
CC:	"olof@...om.net" <olof@...om.net>,
	"grant.likely@...retlab.ca" <grant.likely@...retlab.ca>,
	"lrg@...com" <lrg@...com>,
	"broonie@...nsource.wolfsonmicro.com" 
	<broonie@...nsource.wolfsonmicro.com>,
	"vinod.koul@...ux.intel.com" <vinod.koul@...ux.intel.com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"spi-devel-general@...ts.sourceforge.net" 
	<spi-devel-general@...ts.sourceforge.net>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>
Subject: Re: [PATCH 1/5] ARM: tegra: config: enable dmaengine based APB DMA
 driver

On 08/17/2012 12:38 AM, Laxman Dewangan wrote:
> On Thursday 16 August 2012 11:23 PM, Stephen Warren wrote:
>> On 08/16/2012 08:13 AM, Laxman Dewangan wrote:
>>> Enable config for dmaengine based Tegra APB DMA driver and
>>> disable the legacy APB DMA driver (SYSTEM_DMA).
>> Laxman, if I apply this series to next-20120816 (plus a few patches in
>> my local work branch plus the CPU hotplug patches from Joseph, although
>> I suspect none of that matters), then audio playback on Tegra20 is
>> broken; the pitch is far too high. Audio playback on Tegra30 works as
>> expected.
>
> I run the test again on ventana and did not see any issue.
> I play one song and saw similar behavior with/without this series.

OK, I'll test some other boards. I tested Whistler, although all the
clocking logic is identical between all Tegra20 boards.

> With this series:
> --------------------
> 
> ubuntu@...ra-ubuntu:/home$ aplay "1-04 Hungry Like The Wolf.wav"
> Playing WAVE '1-04 Hungry Like The Wolf.wav' : Signed 16 bit Little
> Endian, Rate
>  44100 Hz, Stereo
> underrun!!! (at least 5039.388 ms long)

Why are you getting all these underruns? I almost never see this, except
when something else is hammering the SD card containing the .wav file.
If I saw those, I'd count it as a test failure.
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