[alsa-devel] [PATCH v2 3/4] ASoC: davinci-mcasp: Constraint on the period and buffer size based on FIFO usage

Mark Brown broonie at kernel.org
Tue Mar 18 13:42:43 CET 2014

On Tue, Mar 18, 2014 at 02:35:48PM +0200, Peter Ujfalusi wrote:
> On 03/17/2014 06:52 PM, Mark Brown wrote:

> > It's sounding like if we should be doing it this is a general
> > thing which we should be constraining presumably it'd apply to all
> > drivers, not just this one, and so shouldn't be being fixed in the
> > driver but it's not obvious to me why the period constraint isn't
> > sufficient.

> It can only be done if we have fixed FIFO for the dai. Right now this is kind
> of true for McASP. In HW we actually have 64 32bit word FIFO and currently you
> can set the desired FIFO depth via DT/pdata. I'm not really happy about this

Sorry, what I meant was more the bit where you were setting the
constraint on both the buffer and the period than the constraint itself
- that seemed somehow redundant.
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