summaryrefslogtreecommitdiff
path: root/sound/soc/sh
diff options
context:
space:
mode:
Diffstat (limited to 'sound/soc/sh')
-rw-r--r--sound/soc/sh/rcar/core.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/sound/soc/sh/rcar/core.c b/sound/soc/sh/rcar/core.c
index 7c68f9d4a0ed..1bf261d677b7 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);