On Tue, Jan 3, 2017 at 4:22 PM, Caleb Crome <ccrome@xxxxxxxxx> wrote: > From: Caleb Crome <caleb@xxxxxxxxx> > > The fsl_ssi fifo watermark is by default set to 2 free spaces (i.e. > activate DMA on FIFO when only 2 spaces are left.) This means the > DMA must service the fifo within 2 audio samples, which is just not > enough time for many use cases with high data rate. In many > configurations the audio channel slips (causing l/r swap in stereo > configurations, or channel slipping in multi-channel configurations). > > This patch gives more breathing room and allows the SSI to operate > reliably by changing the fifio refill watermark to 8. > > There is no change in behavior for older chips (with an 8-deep fifo). > Only the newer chips with a 15-deep fifo get the new behavior. I > suspect a new fifo depth setting could be optimized on the older > chips too, but I have not tested. > > Signed-off-by: Caleb Crome <caleb@xxxxxxxxx> Reviewed-by: Fabio Estevam <fabio.estevam@xxxxxxx> _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
