[PATCH 4/6 v3] ASoC: rsnd: CTU kctrl sets once

[Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>]

From: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>

Same CTU might be used few times if system/platform is using MIX.
For example below case.

	DAI0 playback = <&src0 &ctu02 &mix0 &dvc0 &ssi0>;
	DAI1 playback = <&src2 &ctu03 &mix0 &dvc0 &ssi0>;

This case, ALSA will have CTU,0 and CTU,1 kcontrol interfaces,
but these are same CTU. This is confusing.
This patch adds new flags and avoid such case.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Tested-by: Hiroyuki Yokoyama <hiroyuki.yokoyama.vx@renesas.com>
---
v2 -> v3

 - INITIALIZEED -> INITIALIZED
 - confusable -> confusing

 sound/soc/sh/rcar/ctu.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/sound/soc/sh/rcar/ctu.c b/sound/soc/sh/rcar/ctu.c
index e7f53f4..ad07ba8 100644
--- a/sound/soc/sh/rcar/ctu.c
+++ b/sound/soc/sh/rcar/ctu.c
@@ -81,8 +81,11 @@ struct rsnd_ctu {
 	struct rsnd_kctrl_cfg_m sv3;
 	struct rsnd_kctrl_cfg_s reset;
 	int channels;
+	u32 flags;
 };
 
+#define KCTRL_INITIALIZED	(1 << 0)
+
 #define rsnd_ctu_nr(priv) ((priv)->ctu_nr)
 #define for_each_rsnd_ctu(pos, priv, i)					\
 	for ((i) = 0;							\
@@ -277,6 +280,9 @@ static int rsnd_ctu_pcm_new(struct rsnd_mod *mod,
 	struct rsnd_ctu *ctu = rsnd_mod_to_ctu(mod);
 	int ret;
 
+	if (rsnd_flags_has(ctu, KCTRL_INITIALIZED))
+		return 0;
+
 	/* CTU Pass */
 	ret = rsnd_kctrl_new_m(mod, io, rtd, "CTU Pass",
 			       rsnd_kctrl_accept_anytime,
@@ -326,6 +332,8 @@ static int rsnd_ctu_pcm_new(struct rsnd_mod *mod,
 			       rsnd_ctu_value_reset,
 			       &ctu->reset, 1);
 
+	rsnd_flags_set(ctu, KCTRL_INITIALIZED);
+
 	return ret;
 }
 
-- 
1.9.1