On Thu, 3 Jul 2014 11:44:32 +0100 Mark Brown broonie@kernel.org wrote:
I'd expect this to return an error for the busy DAI rather than just silently ignore it failing to start or (better) implement some control to let the user select which of the DAIs is active.
This is not an error. If the audio subsystem (DPCM, not the user) chooses to activate both I2S and S/PDIF, this means the HDMI audio may be taken either from I2S or from S/PDIF: both inputs have the right format and rate.
Your board happens to only be able to present the same input on both I2S and S/PDIF but that might not apply to other boards, they may be able to route different signals to each which would present a practical problem.
If there are two different streamss on I2S and S/PDIF, and if the audio subsystem wants to route these streams to the same connector (widget 'hdmi-out'), then, somewhere, there should be a software or a design bug. No?
Anyway, the tda998x cannot know if the double route is wanted or not.