[alsa-devel] [PATCH 3/3] ASoC: omap-mcbsp: Add period size protection mode
tpiepho at gmail.com
Tue Mar 20 20:47:31 CET 2012
On Tue, Mar 20, 2012 at 3:20 PM, Jarkko Nikula <jarkko.nikula at bitmer.com> wrote:
> On 03/20/2012 06:42 PM, Grazvydas Ignotas wrote:
>> This is what we have in pandora tree now:
>> Seems to work well for everything here.
> To me this looks more like a correct fix. At quick test I got single
> xrun when starting up but not endless loop of them. Maybe need to tune a
> bit with CONFIG_SND_PCM_XRUN_DEBUG=y.
Does the ALSA API allow the driver to change start_threshold in the
prepare function? It seems what is needed is a minimum
start_threshold constraint, but there aren't constaints for sw_params.
With that fix, you could have an app set start_threshold to 50 ms,
write 51 ms of audio, and expect the stream to start. But it won't,
because the driver has increased start_threshold. The app could have
read back start_threshold from the driver, but I doubt any apps do
this, since there is nothing in the documentation about that being
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