Date:	Fri, 3 Jul 2015 17:13:42 +0800
From:	Zidan Wang <zidan.wang@...escale.com>
To:	<broonie@...nel.org>
CC:	<perex@...ex.cz>, <tiwai@...e.de>,
	<ckeepax@...nsource.wolfsonmicro.com>, <lars@...afoo.de>,
	<patches@...nsource.wolfsonmicro.com>,
	<alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>,
	Zidan Wang <zidan.wang@...escale.com>
Subject: [alsa-devel][PATCH v2] ASoC: wm8960: update pll and clock setting function

Add sysclk auto mode. When it's sysclk auto mode, if the MCLK is
available for clock configure, using MCLK to provide sysclk directly,
otherwise, search a available pll out frequcncy and set pll.

TX and RX share the same sysclk and bclk divider register, and have
different DAC/ADC divier register. When playback and capture
simultaneously, the second stream should not set pll, should not
change the sysclk and bclk, just need set DAC/ADC divider to support
different TX and RX sample rate.

Signed-off-by: Zidan Wang <zidan.wang@...escale.com>
---
 sound/soc/codecs/wm8960.c | 256 ++++++++++++++++++++++++++++++++++++++--------
 sound/soc/codecs/wm8960.h |   1 +
 2 files changed, 214 insertions(+), 43 deletions(-)

diff --git a/sound/soc/codecs/wm8960.c b/sound/soc/codecs/wm8960.c
index 94c5c46..e170bdf 100644
--- a/sound/soc/codecs/wm8960.c
+++ b/sound/soc/codecs/wm8960.c
@@ -48,6 +48,9 @@
 #define WM8960_DISOP     0x40
 #define WM8960_DRES_MASK 0x30
 
+static bool is_pll_freq_available(unsigned int source, unsigned int target);
+static int wm8960_set_pll(struct snd_soc_dai *codec_dai,
+		unsigned int freq_in, unsigned int freq_out);
 /*
  * wm8960 register cache
  * We can't read the WM8960 register space when we are
@@ -126,9 +129,12 @@ struct wm8960_priv {
 	struct snd_soc_dapm_widget *rout1;
 	struct snd_soc_dapm_widget *out3;
 	bool deemph;
-	int playback_fs;
-	int bclk;
 	int sysclk;
+	int clk_id;
+	int freq_in;
+	int fs[2];
+	int dac_div[2];
+	bool is_stream_in_use[2];
 	struct wm8960_data pdata;
 };
 
@@ -164,8 +170,8 @@ static int wm8960_set_deemph(struct snd_soc_codec *codec)
 	if (wm8960->deemph) {
 		best = 1;
 		for (i = 2; i < ARRAY_SIZE(deemph_settings); i++) {
-			if (abs(deemph_settings[i] - wm8960->playback_fs) <
-			    abs(deemph_settings[best] - wm8960->playback_fs))
+			if (abs(deemph_settings[i] - wm8960->fs[1]) <
+			    abs(deemph_settings[best] - wm8960->fs[1]))
 				best = i;
 		}
 
@@ -565,6 +571,9 @@ static struct {
 	{  8000, 5 },
 };
 
+/* -1 for reserved value */
+static const int sysclk_divs[] = { 1, -1, 2, -1 };
+
 /* Multiply 256 for internal 256 div */
 static const int dac_divs[] = { 256, 384, 512, 768, 1024, 1408, 1536 };
 
@@ -574,61 +583,166 @@ static const int bclk_divs[] = {
 	120, 160, 220, 240, 320, 320, 320
 };
 
-static void wm8960_configure_clocking(struct snd_soc_codec *codec,
-		bool tx, int lrclk)
+static int wm8960_configure_clocking(struct snd_pcm_substream *substream,
+		struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
 {
+	struct snd_soc_codec *codec = dai->codec;
 	struct wm8960_priv *wm8960 = snd_soc_codec_get_drvdata(codec);
+	unsigned int sample_rate = params_rate(params);
+	unsigned int channels = params_channels(params);
+	unsigned int sysclk, bclk, freq_out, freq_in;
+	bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
 	u16 iface1 = snd_soc_read(codec, WM8960_IFACE1);
 	u16 iface2 = snd_soc_read(codec, WM8960_IFACE2);
-	u32 sysclk;
-	int i, j;
+	int i, j, k;
 
 	if (!(iface1 & (1<<6))) {
 		dev_dbg(codec->dev,
 			"Codec is slave mode, no need to configure clock\n");
-		return;
+		return 0;
+	}
+
+	/*
+	 * playback and capture using the same registers of bclk and sysclk
+	 * div, and different registers for dac/adc div. If playback and capture
+	 * simultaneously, the second should not set pll, should not change
+	 * the sysclk and bclk, only dac/adc div can be set to support different
+	 * frame clock.
+	 */
+	if (wm8960->is_stream_in_use[!tx]) {
+		/*
+		 * If ADCLRC configure as GPIO pin, DACLRC pin is used as a
+		 * frame clock for ADCs and DACs.
+		 */
+		if (iface2 & (1 << 6)) {
+			snd_soc_update_bits(codec, WM8960_CLOCK1,
+					0x7 << 3, wm8960->dac_div[!tx] << 3);
+			return 0;
+		}
+
+		/*
+		 * If the different TX and RX sample rate can be support,
+		 * setting corresponding DAC or ADC divider.
+		 */
+		for (i = 0; i < ARRAY_SIZE(dac_divs); ++i) {
+			if (wm8960->fs[!tx] * dac_divs[wm8960->dac_div[!tx]]
+					== wm8960->fs[tx] * dac_divs[i]) {
+				if (tx)
+					snd_soc_update_bits(codec,
+						WM8960_CLOCK1,
+						0x7 << 3, dac_divs[i] << 3);
+				else
+					snd_soc_update_bits(codec,
+						WM8960_CLOCK1,
+						0x7 << 6, dac_divs[i] << 6);
+				wm8960->dac_div[tx] = dac_divs[i];
+				return 0;
+			}
+		}
+		if (i == ARRAY_SIZE(dac_divs)) {
+			dev_err(codec->dev,
+				"can't support TX=%d RX=%d\n simultaneously",
+				wm8960->fs[1], wm8960->fs[0]);
+			return -EINVAL;
+		}
+	}
+
+	if (wm8960->clk_id != WM8960_SYSCLK_MCLK && !wm8960->freq_in) {
+		dev_err(codec->dev, "No MCLK configured\n");
+		return -EINVAL;
 	}
 
-	if (!wm8960->sysclk) {
-		dev_dbg(codec->dev, "No SYSCLK configured\n");
-		return;
+	freq_in = wm8960->freq_in;
+
+	bclk = snd_soc_params_to_bclk(params);
+	if (channels == 1)
+		bclk *= 2;
+
+	/*
+	 * If it's sysclk auto mode, check if the MCLK can provide sysclk or
+	 * not. If MCLK can provide sysclk, using MCLK to provide sysclk
+	 * directly. Otherwise, auto select a available pll out frequency
+	 * and set PLL.
+	 */
+	if (wm8960->clk_id == WM8960_SYSCLK_AUTO) {
+		/* disable the PLL and using MCLK to provide sysclk */
+		wm8960_set_pll(dai, 0, 0);
+		freq_out = freq_in;
+	} else if (wm8960->sysclk)
+		freq_out = wm8960->sysclk;
+	else {
+		dev_err(codec->dev, "No SYSCLK configured\n");
+		return -EINVAL;
 	}
 
-	if (!wm8960->bclk || !lrclk) {
-		dev_dbg(codec->dev, "No audio clocks configured\n");
-		return;
+	/* check if the sysclk frequency is available. */
+	for (i = 0; i < ARRAY_SIZE(sysclk_divs); ++i) {
+		if (sysclk_divs[i] == -1)
+			continue;
+		sysclk = freq_out / sysclk_divs[i];
+		for (j = 0; j < ARRAY_SIZE(dac_divs); ++j) {
+			if (sysclk == dac_divs[j] * sample_rate) {
+				for (k = 0; k < ARRAY_SIZE(bclk_divs); ++k)
+					if (sysclk == bclk * bclk_divs[k] / 10)
+						break;
+				if (k != ARRAY_SIZE(bclk_divs))
+					break;
+			}
+		}
+		if (j != ARRAY_SIZE(dac_divs))
+			break;
 	}
 
-	for (i = 0; i < ARRAY_SIZE(dac_divs); ++i) {
-		if (wm8960->sysclk == lrclk * dac_divs[i]) {
-			for (j = 0; j < ARRAY_SIZE(bclk_divs); ++j) {
-				sysclk = wm8960->bclk * bclk_divs[j] / 10;
-				if (wm8960->sysclk == sysclk)
+	if (i != ARRAY_SIZE(sysclk_divs))
+		goto configure_clock;
+	else if (wm8960->clk_id != WM8960_SYSCLK_AUTO) {
+		dev_err(codec->dev, "failed to configure clock\n");
+		return -EINVAL;
+	}
+	/* get a available pll out frequency and set pll */
+	for (i = 0; i < ARRAY_SIZE(sysclk_divs); ++i) {
+		if (sysclk_divs[i] == -1)
+			continue;
+		for (j = 0; j < ARRAY_SIZE(dac_divs); ++j) {
+			sysclk = sample_rate * dac_divs[j];
+			freq_out = sysclk * sysclk_divs[i];
+
+			for (k = 0; k < ARRAY_SIZE(bclk_divs); ++k) {
+				if (sysclk == bclk * bclk_divs[k] / 10 &&
+				    is_pll_freq_available(freq_in, freq_out)) {
+					wm8960_set_pll(dai, freq_in, freq_out);
 					break;
+				} else
+					continue;
 			}
-			if(j != ARRAY_SIZE(bclk_divs))
+			if (k != ARRAY_SIZE(bclk_divs))
 				break;
 		}
+		if (j != ARRAY_SIZE(dac_divs))
+			break;
 	}
 
-	if (i == ARRAY_SIZE(dac_divs)) {
-		dev_err(codec->dev, "Unsupported sysclk %d\n", wm8960->sysclk);
-		return;
+	if (i == ARRAY_SIZE(sysclk_divs)) {
+		dev_err(codec->dev, "failed to configure clock\n");
+		return -EINVAL;
 	}
 
-	/*
-	 * configure frame clock. If ADCLRC configure as GPIO pin, DACLRC
-	 * pin is used as a frame clock for ADCs and DACs.
-	 */
-	if (iface2 & (1<<6))
-		snd_soc_update_bits(codec, WM8960_CLOCK1, 0x7 << 3, i << 3);
+configure_clock:
+	snd_soc_update_bits(codec, WM8960_CLOCK1, 3 << 1, i << 1);
+
+	if (iface2 & (1 << 6))
+		snd_soc_update_bits(codec, WM8960_CLOCK1, 0x7 << 3, j << 3);
 	else if (tx)
-		snd_soc_update_bits(codec, WM8960_CLOCK1, 0x7 << 3, i << 3);
+		snd_soc_update_bits(codec, WM8960_CLOCK1, 0x7 << 3, j << 3);
 	else if (!tx)
-		snd_soc_update_bits(codec, WM8960_CLOCK1, 0x7 << 6, i << 6);
+		snd_soc_update_bits(codec, WM8960_CLOCK1, 0x7 << 6, j << 6);
 
 	/* configure bit clock */
-	snd_soc_update_bits(codec, WM8960_CLOCK2, 0xf, j);
+	snd_soc_update_bits(codec, WM8960_CLOCK2, 0xf, k);
+
+	wm8960->dac_div[tx] = j;
+
+	return 0;
 }
 
 static int wm8960_hw_params(struct snd_pcm_substream *substream,
@@ -641,10 +755,6 @@ static int wm8960_hw_params(struct snd_pcm_substream *substream,
 	bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
 	int i;
 
-	wm8960->bclk = snd_soc_params_to_bclk(params);
-	if (params_channels(params) == 1)
-		wm8960->bclk *= 2;
-
 	/* bit size */
 	switch (params_width(params)) {
 	case 16:
@@ -667,11 +777,11 @@ static int wm8960_hw_params(struct snd_pcm_substream *substream,
 		return -EINVAL;
 	}
 
+	wm8960->fs[tx] = params_rate(params);
 	/* Update filters for the new rate */
-	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
-		wm8960->playback_fs = params_rate(params);
+	if (tx)
 		wm8960_set_deemph(codec);
-	} else {
+	else {
 		for (i = 0; i < ARRAY_SIZE(alc_rates); i++)
 			if (alc_rates[i].rate == params_rate(params))
 				snd_soc_update_bits(codec,
@@ -682,7 +792,27 @@ static int wm8960_hw_params(struct snd_pcm_substream *substream,
 	/* set iface */
 	snd_soc_write(codec, WM8960_IFACE1, iface);
 
-	wm8960_configure_clocking(codec, tx, params_rate(params));
+	wm8960->is_stream_in_use[tx] = true;
+
+	return wm8960_configure_clocking(substream, params, dai);
+}
+
+static int wm8960_hw_free(struct snd_pcm_substream *substream,
+		struct snd_soc_dai *dai)
+{
+	struct snd_soc_codec *codec = dai->codec;
+	struct wm8960_priv *wm8960 = snd_soc_codec_get_drvdata(codec);
+	u16 clock1 = snd_soc_read(codec, WM8960_CLOCK1);
+	bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
+
+	wm8960->is_stream_in_use[tx] = false;
+	/*
+	 * If it's sysclk auto mode, no stream in use, and the pll is enabled,
+	 * disable the pll
+	 */
+	if (wm8960->clk_id == WM8960_SYSCLK_AUTO && (clock1 & 0x1) &&
+	    !wm8960->is_stream_in_use[!tx])
+		wm8960_set_pll(dai, 0, 0);
 
 	return 0;
 }
@@ -892,6 +1022,28 @@ struct _pll_div {
 	u32 k:24;
 };
 
+static bool is_pll_freq_available(unsigned int source, unsigned int target)
+{
+	unsigned int Ndiv;
+
+	if (source == 0 || target == 0)
+		return false;
+
+	/* Scale up target to PLL operating frequency */
+	target *= 4;
+	Ndiv = target / source;
+
+	if (Ndiv < 6) {
+		source >>= 1;
+		Ndiv = target / source;
+	}
+
+	if ((Ndiv < 6) || (Ndiv > 12))
+		return false;
+
+	return true;
+}
+
 /* The size in bits of the pll divide multiplied by 10
  * to allow rounding later */
 #define FIXED_PLL_SIZE ((1 << 24) * 10)
@@ -943,8 +1095,8 @@ static int pll_factors(unsigned int source, unsigned int target,
 	return 0;
 }
 
-static int wm8960_set_dai_pll(struct snd_soc_dai *codec_dai, int pll_id,
-		int source, unsigned int freq_in, unsigned int freq_out)
+static int wm8960_set_pll(struct snd_soc_dai *codec_dai,
+		unsigned int freq_in, unsigned int freq_out)
 {
 	struct snd_soc_codec *codec = codec_dai->codec;
 	u16 reg;
@@ -986,6 +1138,20 @@ static int wm8960_set_dai_pll(struct snd_soc_dai *codec_dai, int pll_id,
 	return 0;
 }
 
+static int wm8960_set_dai_pll(struct snd_soc_dai *codec_dai, int pll_id,
+		int source, unsigned int freq_in, unsigned int freq_out)
+{
+	struct snd_soc_codec *codec = codec_dai->codec;
+	struct wm8960_priv *wm8960 = snd_soc_codec_get_drvdata(codec);
+
+	wm8960->freq_in = freq_in;
+
+	if (wm8960->clk_id == WM8960_SYSCLK_AUTO)
+		return 0;
+
+	return wm8960_set_pll(codec_dai, freq_in, freq_out);
+}
+
 static int wm8960_set_dai_clkdiv(struct snd_soc_dai *codec_dai,
 		int div_id, int div)
 {
@@ -1043,11 +1209,14 @@ static int wm8960_set_dai_sysclk(struct snd_soc_dai *dai, int clk_id,
 		snd_soc_update_bits(codec, WM8960_CLOCK1,
 					0x1, WM8960_SYSCLK_PLL);
 		break;
+	case WM8960_SYSCLK_AUTO:
+		break;
 	default:
 		return -EINVAL;
 	}
 
 	wm8960->sysclk = freq;
+	wm8960->clk_id = clk_id;
 
 	return 0;
 }
@@ -1060,6 +1229,7 @@ static int wm8960_set_dai_sysclk(struct snd_soc_dai *dai, int clk_id,
 
 static const struct snd_soc_dai_ops wm8960_dai_ops = {
 	.hw_params = wm8960_hw_params,
+	.hw_free = wm8960_hw_free,
 	.digital_mute = wm8960_mute,
 	.set_fmt = wm8960_set_dai_fmt,
 	.set_clkdiv = wm8960_set_dai_clkdiv,
diff --git a/sound/soc/codecs/wm8960.h b/sound/soc/codecs/wm8960.h
index 2d8163d..ab3220d 100644
--- a/sound/soc/codecs/wm8960.h
+++ b/sound/soc/codecs/wm8960.h
@@ -82,6 +82,7 @@
 
 #define WM8960_SYSCLK_MCLK		(0 << 0)
 #define WM8960_SYSCLK_PLL		(1 << 0)
+#define WM8960_SYSCLK_AUTO		(2 << 0)
 
 #define WM8960_DAC_DIV_1		(0 << 3)
 #define WM8960_DAC_DIV_1_5		(1 << 3)
-- 
1.9.1

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