[alsa-devel] [PATCH 1/5] ARM: tegra: config: enable dmaengine based APB DMA driver

Stephen Warren swarren at wwwdotorg.org
Fri Aug 17 17:17:55 CEST 2012

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 at tegra-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.

More information about the Alsa-devel mailing list