ASoC: rsnd: add detail explanation of L/R conversion timing (8cce431a) · Commits · 戴 / test

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@renesas.com> Signed-off-by:

Mark Brown <broonie@kernel.org>

sound/soc/sh/rcar/core.c

+18 −0

Original line number	Diff line number	Diff line
		@@ -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);

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