From: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx> Renesas Sound device *Hardware* L/R and Linux *Software* L/R are inverted. Because of this background, it needs to convert L/R. Then, DVC needs *Hardware* L/R, and Linux needs *Software* L/R. Because Playback/Capture needs different timing, and there is no explanation about it on source code / git log, this patch adds it. Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx> --- sound/soc/sh/rcar/core.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/sound/soc/sh/rcar/core.c b/sound/soc/sh/rcar/core.c index 7c68f9d..1bf261d 100644 --- a/sound/soc/sh/rcar/core.c +++ b/sound/soc/sh/rcar/core.c @@ -310,6 +310,24 @@ u32 rsnd_get_dalign(struct rsnd_mod *mod, struct rsnd_dai_stream *io) u32 val = 0x76543210; u32 mask = ~0; + /* + * *Hardware* L/R and *Software* L/R are inverted. + * We need to care about inversion timing to control + * Playback/Capture correctly. + * The point is [DVC] needs *Hardware* L/R, [MEM] needs *Software* L/R + * + * sL/R : software L/R + * hL/R : hardware L/R + * (*) : conversion timing + * + * Playback + * sL/R (*) hL/R hL/R hL/R hL/R hL/R + * [MEM] -> [SRC] -> [DVC] -> [CMD] -> [SSIU] -> [SSI] -> codec + * + * Capture + * hL/R hL/R hL/R hL/R hL/R (*) sL/R + * codec -> [SSI] -> [SSIU] -> [SRC] -> [DVC] -> [CMD] -> [MEM] + */ if (rsnd_io_is_play(io)) { struct rsnd_mod *src = rsnd_io_to_mod_src(io); -- 1.9.1 _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel