On Tue, Aug 11, 2020 at 11:54:38AM -0500, Pierre-Louis Bossart wrote:
constraint logic needs to know about this DSP limitation - it seems like none of this is going to change without something new going into the mix? We at least need a new question to ask about the DSP firmware I think.
I just tested aplay -Dhw: on a Cyan Chromebook with the Ubuntu kernel 5.4, and I see no issues with the 240 sample period. Same with 432, 960, 9600, etc.
I also tried just for fun what happens with 256 samples, and I don't see any underflows thrown either, so I am wondering what exactly the problem is? Something's not adding up. I would definitively favor multiple of 1ms periods, since it's the only case that was productized, but there's got to me something a side effect of how CRAS programs the hw_params.
Is it something that goes wrong with longer playbacks possibly (eg, someone watching a feature film or something)?