Hi Caleb, Fabio pointed to that thread because I'm trying to use the i.mx7d SAI in TDM mode with 8 channels (but I'm using only 4). On 02/05/2016 at 10:52:39 -0700, Caleb Crome wrote : > Hi all, > Now that the MX6 fsl_ssi seems to be getting stable for TDM with > channels > 2 (thanks all!), the MX6 UL and MX7 have only the SAI port. > > Does anybody have experience with running the SAI with more than 2 channels? > I have a really small patch to make the SAI driver configure CR4 and CR5 properly for more than 2 channels. Data on the TDM bus seems fine. However, I have an issue with the sample ordering. Discussing that with Lars, it seems the SDMA is getting confused when switching periods. To test, I'm playing a 441Hz sine that is fading out. I can definitively see block of 1024 samples (it is period_size) that are ok but not properly ordered. You can have a look at: http://free-electrons.com/~alexandre/playback.png Did you have the same issue? -- Alexandre Belloni, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
