ASoC: rsnd: adjust convert rate in 1%

Merge series from Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>:

Renesas Synchronous SRC Mode has HW limitation to be used in 1% rate
difference, but driver didn't care it. This patch-set adjust to it.

Link: https://lore.kernel.org/r/87o6zi32ry.wl-kuninori.morimoto.gx@renesas.com

sound/soc/renesas/rcar/core.c

@@ -1770,20 +1770,6 @@ int rsnd_kctrl_accept_anytime(struct rsnd_dai_stream *io)
 	return 1;
 }
 
-int rsnd_kctrl_accept_runtime(struct rsnd_dai_stream *io)
-{
-	struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
-	struct rsnd_priv *priv = rsnd_io_to_priv(io);
-	struct device *dev = rsnd_priv_to_dev(priv);
-
-	if (!runtime) {
-		dev_warn(dev, "Can't update kctrl when idle\n");
-		return 0;
-	}
-
-	return 1;
-}
-
 struct rsnd_kctrl_cfg *rsnd_kctrl_init_m(struct rsnd_kctrl_cfg_m *cfg)
 {
 	cfg->cfg.val = cfg->val;

sound/soc/renesas/rcar/rsnd.h

@@ -742,7 +742,6 @@ struct rsnd_kctrl_cfg_s {
 #define rsnd_kctrl_vals(x)	((x).val)	/* = (x).cfg.val[0] */
 
 int rsnd_kctrl_accept_anytime(struct rsnd_dai_stream *io);
-int rsnd_kctrl_accept_runtime(struct rsnd_dai_stream *io);
 struct rsnd_kctrl_cfg *rsnd_kctrl_init_m(struct rsnd_kctrl_cfg_m *cfg);
 struct rsnd_kctrl_cfg *rsnd_kctrl_init_s(struct rsnd_kctrl_cfg_s *cfg);
 int rsnd_kctrl_new(struct rsnd_mod *mod,

sound/soc/renesas/rcar/src.c

@@ -35,6 +35,7 @@ struct rsnd_src {
 	struct rsnd_mod *dma;
 	struct rsnd_kctrl_cfg_s sen;  /* sync convert enable */
 	struct rsnd_kctrl_cfg_s sync; /* sync convert */
+	u32 current_sync_rate;
 	int irq;
 };
 
@@ -100,7 +101,7 @@ static u32 rsnd_src_convert_rate(struct rsnd_dai_stream *io,
 	if (!rsnd_src_sync_is_enabled(mod))
 		return rsnd_io_converted_rate(io);
 
-	convert_rate = src->sync.val;
+	convert_rate = src->current_sync_rate;
 
 	if (!convert_rate)
 		convert_rate = rsnd_io_converted_rate(io);
@@ -201,13 +202,73 @@ static const u32 chan222222[] = {
 static void rsnd_src_set_convert_rate(struct rsnd_dai_stream *io,
 				      struct rsnd_mod *mod)
 {
+	struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
+	struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
+	struct rsnd_src *src = rsnd_mod_to_src(mod);
+	u32 fin, fout, new_rate;
+	int inc, cnt, rate;
+	u64 base, val;
+
+	if (!runtime)
+		return;
+
+	if (!rsnd_src_sync_is_enabled(mod))
+		return;
+
+	fin	= rsnd_src_get_in_rate(priv, io);
+	fout	= rsnd_src_get_out_rate(priv, io);
+
+	new_rate = src->sync.val;
+
+	if (!new_rate)
+		new_rate = fout;
+
+	/* Do nothing if no diff */
+	if (new_rate == src->current_sync_rate)
+		return;
+
+	/*
+	 * SRCm_IFSVR::INTIFS can change within 1%
+	 * see
+	 *	SRCm_IFSVR::INTIFS Note
+	 */
+	inc = fout / 100;
+	cnt = abs(new_rate - fout) / inc;
+	if (fout > new_rate)
+		inc *= -1;
+
+	/*
+	 * After start running SRC, we can update only SRC_IFSVR
+	 * for Synchronous Mode
+	 */
+	base = (u64)0x0400000 * fin;
+	rate  = fout;
+	for (int i = 0; i < cnt; i++) {
+		val   = base;
+		rate += inc;
+		do_div(val, rate);
+
+		rsnd_mod_write(mod, SRC_IFSVR, val);
+	}
+	val   = base;
+	do_div(val, new_rate);
+
+	rsnd_mod_write(mod, SRC_IFSVR, val);
+
+	/* update current_sync_rate */
+	src->current_sync_rate = new_rate;
+}
+
+static void rsnd_src_init_convert_rate(struct rsnd_dai_stream *io,
+				       struct rsnd_mod *mod)
+{
+	struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
 	struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
 	struct device *dev = rsnd_priv_to_dev(priv);
-	struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
 	int is_play = rsnd_io_is_play(io);
 	int use_src = 0;
 	u32 fin, fout;
-	u32 ifscr, fsrate, adinr;
+	u32 ifscr, adinr;
 	u32 cr, route;
 	u32 i_busif, o_busif, tmp;
 	const u32 *bsdsr_table;
@@ -245,26 +306,15 @@ static void rsnd_src_set_convert_rate(struct rsnd_dai_stream *io,
 	adinr = rsnd_get_adinr_bit(mod, io) | chan;
 
 	/*
-	 * SRC_IFSCR / SRC_IFSVR
+	 * SRC_IFSCR
-	 */
-	ifscr = 0;
-	fsrate = 0;
-	if (use_src) {
-		u64 n;
-
-		ifscr = 1;
-		n = (u64)0x0400000 * fin;
-		do_div(n, fout);
-		fsrate = n;
-	}
-
-	/*
 	 * SRC_SRCCR / SRC_ROUTE_MODE0
 	 */
+	ifscr	= 0;
 	cr	= 0x00011110;
 	route	= 0x0;
 	if (use_src) {
 		route	= 0x1;
+		ifscr	= 0x1;
 
 		if (rsnd_src_sync_is_enabled(mod)) {
 			cr |= 0x1;
@@ -335,7 +385,6 @@ static void rsnd_src_set_convert_rate(struct rsnd_dai_stream *io,
 	rsnd_mod_write(mod, SRC_SRCIR, 1);	/* initialize */
 	rsnd_mod_write(mod, SRC_ADINR, adinr);
 	rsnd_mod_write(mod, SRC_IFSCR, ifscr);
-	rsnd_mod_write(mod, SRC_IFSVR, fsrate);
 	rsnd_mod_write(mod, SRC_SRCCR, cr);
 	rsnd_mod_write(mod, SRC_BSDSR, bsdsr_table[idx]);
 	rsnd_mod_write(mod, SRC_BSISR, bsisr_table[idx]);
@@ -348,6 +397,9 @@ static void rsnd_src_set_convert_rate(struct rsnd_dai_stream *io,
 
 	rsnd_adg_set_src_timesel_gen2(mod, io, fin, fout);
 
+	/* update SRC_IFSVR */
+	rsnd_src_set_convert_rate(io, mod);
+
 	return;
 
 convert_rate_err:
@@ -467,7 +519,8 @@ static int rsnd_src_init(struct rsnd_mod *mod,
 	int ret;
 
 	/* reset sync convert_rate */
-	src->sync.val = 0;
+	src->sync.val		=
+	src->current_sync_rate	= 0;
 
 	ret = rsnd_mod_power_on(mod);
 	if (ret < 0)
@@ -475,7 +528,7 @@ static int rsnd_src_init(struct rsnd_mod *mod,
 
 	rsnd_src_activation(mod);
 
-	rsnd_src_set_convert_rate(io, mod);
+	rsnd_src_init_convert_rate(io, mod);
 
 	rsnd_src_status_clear(mod);
 
@@ -493,7 +546,8 @@ static int rsnd_src_quit(struct rsnd_mod *mod,
 	rsnd_mod_power_off(mod);
 
 	/* reset sync convert_rate */
-	src->sync.val = 0;
+	src->sync.val		=
+	src->current_sync_rate	= 0;
 
 	return 0;
 }
@@ -531,6 +585,22 @@ static irqreturn_t rsnd_src_interrupt(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
+static int rsnd_src_kctrl_accept_runtime(struct rsnd_dai_stream *io)
+{
+	struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
+
+	if (!runtime) {
+		struct rsnd_priv *priv = rsnd_io_to_priv(io);
+		struct device *dev = rsnd_priv_to_dev(priv);
+
+		dev_warn(dev, "\"SRC Out Rate\" can use during running\n");
+
+		return 0;
+	}
+
+	return 1;
+}
+
 static int rsnd_src_probe_(struct rsnd_mod *mod,
 			   struct rsnd_dai_stream *io,
 			   struct rsnd_priv *priv)
@@ -585,7 +655,7 @@ static int rsnd_src_pcm_new(struct rsnd_mod *mod,
 			       "SRC Out Rate Switch" :
 			       "SRC In Rate Switch",
 			       rsnd_kctrl_accept_anytime,
-			       rsnd_src_set_convert_rate,
+			       rsnd_src_init_convert_rate,
 			       &src->sen, 1);
 	if (ret < 0)
 		return ret;
@@ -594,7 +664,7 @@ static int rsnd_src_pcm_new(struct rsnd_mod *mod,
 			       rsnd_io_is_play(io) ?
 			       "SRC Out Rate" :
 			       "SRC In Rate",
-			       rsnd_kctrl_accept_runtime,
+			       rsnd_src_kctrl_accept_runtime,
 			       rsnd_src_set_convert_rate,
 			       &src->sync, 192000);
 

sound/soc/renesas/rcar/ssi.c

@@ -336,7 +336,8 @@ static int rsnd_ssi_master_clk_start(struct rsnd_mod *mod,
 	return 0;
 
 rate_err:
-	dev_err(dev, "unsupported clock rate\n");
+	dev_err(dev, "unsupported clock rate (%d)\n", rate);
+
 	return ret;
 }