[alsa-devel] HDAudio period/buffer sizes

[Takashi Iwai]

At Tue, 26 Jul 2011 14:23:40 -0500,
Pierre-Louis Bossart wrote:
> 
> that the buffer itself was already aligned to 128 bytes from the
> > very beginning as it's allocated via dma_alloc_coherent().
> > The fact that the commit fixes the real problem means that the buffer
> > size must be aligned, too, at least for some hardware.
> 
> I checked internally and the reply was "There is no requirement the buffer 
> must be 128 byte multiples.  As long as it is integer number of samples, we
> are good."
> 
> What's the best way to deal with it? Add a driver option? A compilation
> option?

I'd say a driver option since this must be dynamically adjustable.
Care to make a patch?

For 3.2 (after 3.1 merge window), we can disable 128-bytes limit as
default again for testing.  If someone hits the problem, he can switch
easily and we can investigate more at this time.


thanks,

Takashi