On Tue, Oct 13, 2009 at 03:15:45PM -0500, Lopez Cruz, Misael wrote:
From TWL6030 CODEC driver pespective, the DAI link supported rate should be 48kHz or 96kHz? If the final goal is to explicitly represent all links in the system (ABE, Phoenix, McBSP, etc), then ABE link should expose somehow that it delives upsampled data. If that assumption is true, then TWL6030 DAI should support 96kHz.
Yes, that sounds like the way to go.
A second concern is that runtime constraints will prevent rates supported by the system, when the constraints are only valid for the link. For example, if the TWL6030 CODEC adds a contraint for 96kHz, then it prevents the whole system to play 48kHz, which is supported when ABE is enabled since ABE upsamples it.
Initially I'd say that we should only represent the requirements on each end of a given link and make the devices responsible for imposing constraints that come from routing between two interfaces. We'd need to see how all this works in practice, though.