[alsa-devel] [PATCH 3/3] imx-ssi: Use a hrtimer in FIQ mode

Mark Brown broonie at opensource.wolfsonmicro.com
Thu Apr 8 17:45:15 CEST 2010

On Thu, Apr 08, 2010 at 04:14:29PM +0100, Liam Girdwood wrote:

> I agree this will drift but I _think_ we are probably workable here for
> most latency sensitive apps as long as the worst case notification delay
> is 1 period, pointer() is accurate to a few frames and there is a least
> > 3 or 4 period buffers available for use in our driver buffer (for each
> direction). 

Yes, if they're running more than one period ahead everything should be

> Currently the min periods for this driver is 2, so I would probably
> change to 4 to reduce drift related glitches.

Good idea.

More information about the Alsa-devel mailing list