On Fri, Jan 10, 2014 at 04:52:29PM +0000, Mark Brown wrote: > On Fri, Jan 10, 2014 at 11:48:25PM +0800, Nicolin Chen wrote: > > > I think I start to understand the point here: If a user only needs to > > playback > > the default case - 44.1KHz for example, the driver can just configure all > > the > > dividers once at the beginning, not every time, so that we can save further > > register overriding operation or even complicated clock selection and > > divisor > > calculation, which obviously makes the procedure clean and reduces the > > system > > loading even if it might be just in a slight level. > > > Is this the reason, or maybe one of the reasons, to the defaults providing? > > The main thing is that if the DAI driver does it then it's less code in > the machine drivers using it - what tends to happen otherwise is that > quite a few machine drivers end up replicating the same logic. Hardware > designers tend to do a lot of cut'n'paste with these things so even if > the CODEC is different the clocking is often very similar.
Point taken. And it also depends on how common the defaults would be. I think I should try to figure out a comparably generic template for the clock selection and its rate settings here and also check other redundant places. I learned another lesson today. Thank you indeed. Nicolin _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
