On Mon, Aug 31, 2015 at 12:05:51PM -0700, Anatol Pomozov wrote:
Thus "normal" FSYNC for this driver means that the frame (L channel) starts at rising edge of FSYNC (wm8731 datasheet calls it DACLRC). "inverted" means frame starts at the falling edge. It differs both from TegraX1 and rt5677 above.
It looks like each driver uses its own definition of FSYNC polarity. To avoid compatibility problems between different codecs/socs there should be a clean definition of what is FSYNC polarity is. I would propose something simple like: **** "normal" FSYNC means frame starts at rising edge of FSYNC, and "inverted" frame starts at falling FSYNC edge **** i.e. the same as for 8731.
Right, the Tegra and Realtek drivers are buggy here - the wm8731 definition is the one that essentially everything is using.