ASoC: rsnd: add TDM Split mode support

This patch adds TDM Split mode support. rsnd driver is assuming
audio-graph-scu-card is used for Sound Card.

This is very simple sample DT settings to use it.

	sound_card: sound {
		compatible = "audio-graph-scu-card";
		...
		convert-channels = <8>; /* TDM Split */

		dais = <&rsnd_port0     /* playback ch1/ch2 */
			&rsnd_port1     /* playback ch3/ch4 */
			&rsnd_port2     /* playback ch5/ch6 */
			&rsnd_port3     /* playback ch7/ch8 */
			>;
	};

	audio-codec {
		...
		port {
			codec_0: endpoint@1 {
				remote-endpoint = <&rsnd_ep0>;
			};
			codec_1: endpoint@2 {
				remote-endpoint = <&rsnd_ep1>;
			};
			codec_2: endpoint@3 {
				remote-endpoint = <&rsnd_ep2>;
			};
			codec_3: endpoint@4 {
				remote-endpoint = <&rsnd_ep3>;
			};
		};
	};

	&rcar_sound {
		...
		ports {
			rsnd_port0: port@0 {
				rsnd_ep0: endpoint {
					remote-endpoint = <&codec_0>;
					...
					playback = <&ssiu30 &ssi3>;
				};
			};
			rsnd_port1: port@1 {
				rsnd_ep1: endpoint {
					remote-endpoint = <&codec_1>;
					...
					playback = <&ssiu31 &ssi3>;
				};
			};
			rsnd_port2: port@2 {
				rsnd_ep2: endpoint {
					remote-endpoint = <&codec_2>;
					...
					playback = <&ssiu32 &ssi3>;
				};
			};
			rsnd_port3: port@3 {
				rsnd_ep3: endpoint {
					remote-endpoint = <&codec_3>;
					...
					playback = <&ssiu33 &ssi3>;
				};
			};
		};
	};

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 23 insertions, 4 deletions

diff --git a/sound/soc/sh/rcar/ssi.c b/sound/soc/sh/rcar/ssi.c
index 940a7ac69af1..26fc4a5da0e8 100644
--- a/sound/soc/sh/rcar/ssi.c
+++ b/sound/soc/sh/rcar/ssi.c
@@ -298,6 +298,9 @@ static int rsnd_ssi_master_clk_start(struct rsnd_mod *mod,
 		return 0;
 	}
 
+	if (rsnd_runtime_is_tdm_split(io))
+		chan = rsnd_io_converted_chan(io);
+
 	main_rate = rsnd_ssi_clk_query(rdai, rate, chan, &idx);
 	if (!main_rate) {
 		dev_err(dev, "unsupported clock rate\n");
@@ -360,9 +363,11 @@ static void rsnd_ssi_config_init(struct rsnd_mod *mod,
 	u32 cr_own	= ssi->cr_own;
 	u32 cr_mode	= ssi->cr_mode;
 	u32 wsr		= ssi->wsr;
-	int is_tdm;
+	int width;
+	int is_tdm, is_tdm_split;
 
-	is_tdm = rsnd_runtime_is_tdm(io);
+	is_tdm		= rsnd_runtime_is_tdm(io);
+	is_tdm_split	= rsnd_runtime_is_tdm_split(io);
 
 	cr_own |= FORCE | rsnd_rdai_width_to_swl(rdai);
 
@@ -381,7 +386,7 @@ static void rsnd_ssi_config_init(struct rsnd_mod *mod,
 	 *	rsnd_ssiu_init_gen2()
 	 */
 	wsr = ssi->wsr;
-	if (is_tdm) {
+	if (is_tdm || is_tdm_split) {
 		wsr	|= WS_MODE;
 		cr_own	|= CHNL_8;
 	}
@@ -397,7 +402,18 @@ static void rsnd_ssi_config_init(struct rsnd_mod *mod,
 		cr_own |= TRMD;
 
 	cr_own &= ~DWL_MASK;
-	switch (snd_pcm_format_width(runtime->format)) {
+	width = snd_pcm_format_width(runtime->format);
+	if (is_tdm_split) {
+		/*
+		 * The SWL and DWL bits in SSICR should be fixed at 32-bit
+		 * setting when TDM split mode.
+		 * see datasheet
+		 *	Operation :: TDM Format Split Function (TDM Split Mode)
+		 */
+		width = 32;
+	}
+
+	switch (width) {
 	case 8:
 		cr_own |= DWL_8;
 		break;
@@ -407,6 +423,9 @@ static void rsnd_ssi_config_init(struct rsnd_mod *mod,
 	case 24:
 		cr_own |= DWL_24;
 		break;
+	case 32:
+		cr_own |= DWL_32;
+		break;
 	}
 
 	if (rsnd_ssi_is_dma_mode(mod)) {