ASoC: Add function "rl6231_get_pre_div" to correct the dmic clock calculation

Signed-off-by: Bard Liao <bardliao@realtek.com>
Signed-off-by: Oder Chiou <oder_chiou@realtek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/rl6231.c

@@ -11,9 +11,56 @@
  */
 
 #include <linux/module.h>
+#include <linux/regmap.h>
 
 #include "rl6231.h"
 
+/**
+ * rl6231_get_pre_div - Return the value of pre divider.
+ *
+ * @map: map for setting.
+ * @reg: register.
+ * @sft: shift.
+ *
+ * Return the value of pre divider from given register value.
+ * Return negative error code for unexpected register value.
+ */
+int rl6231_get_pre_div(struct regmap *map, unsigned int reg, int sft)
+{
+	int pd, val;
+
+	regmap_read(map, reg, &val);
+
+	val = (val >> sft) & 0x7;
+
+	switch (val) {
+	case 0:
+	case 1:
+	case 2:
+	case 3:
+		pd = val + 1;
+		break;
+	case 4:
+		pd = 6;
+		break;
+	case 5:
+		pd = 8;
+		break;
+	case 6:
+		pd = 12;
+		break;
+	case 7:
+		pd = 16;
+		break;
+	default:
+		pd = -EINVAL;
+		break;
+	}
+
+	return pd;
+}
+EXPORT_SYMBOL_GPL(rl6231_get_pre_div);
+
 /**
  * rl6231_calc_dmic_clk - Calculate the parameter of dmic.
  *

sound/soc/codecs/rl6231.h

@@ -30,5 +30,6 @@ int rl6231_calc_dmic_clk(int rate);
 int rl6231_pll_calc(const unsigned int freq_in,
 	const unsigned int freq_out, struct rl6231_pll_code *pll_code);
 int rl6231_get_clk_info(int sclk, int rate);
+int rl6231_get_pre_div(struct regmap *map, unsigned int reg, int sft);
 
 #endif /* __RL6231_H__ */

sound/soc/codecs/rt5640.c

@@ -459,10 +459,11 @@ static int set_dmic_clk(struct snd_soc_dapm_widget *w,
 {
 	struct snd_soc_codec *codec = snd_soc_dapm_to_codec(w->dapm);
 	struct rt5640_priv *rt5640 = snd_soc_codec_get_drvdata(codec);
-	int idx = -EINVAL;
+	int idx, rate;
-
-	idx = rl6231_calc_dmic_clk(rt5640->sysclk);
 
+	rate = rt5640->sysclk / rl6231_get_pre_div(rt5640->regmap,
+		RT5640_ADDA_CLK1, RT5640_I2S_PD1_SFT);
+	idx = rl6231_calc_dmic_clk(rate);
 	if (idx < 0)
 		dev_err(codec->dev, "Failed to set DMIC clock\n");
 	else

sound/soc/codecs/rt5645.c

@@ -510,10 +510,11 @@ static int set_dmic_clk(struct snd_soc_dapm_widget *w,
 {
 	struct snd_soc_codec *codec = snd_soc_dapm_to_codec(w->dapm);
 	struct rt5645_priv *rt5645 = snd_soc_codec_get_drvdata(codec);
-	int idx = -EINVAL;
+	int idx, rate;
-
-	idx = rl6231_calc_dmic_clk(rt5645->sysclk);
 
+	rate = rt5645->sysclk / rl6231_get_pre_div(rt5645->regmap,
+		RT5645_ADDA_CLK1, RT5645_I2S_PD1_SFT);
+	idx = rl6231_calc_dmic_clk(rate);
 	if (idx < 0)
 		dev_err(codec->dev, "Failed to set DMIC clock\n");
 	else

sound/soc/codecs/rt5651.c

@@ -378,10 +378,11 @@ static int set_dmic_clk(struct snd_soc_dapm_widget *w,
 {
 	struct snd_soc_codec *codec = snd_soc_dapm_to_codec(w->dapm);
 	struct rt5651_priv *rt5651 = snd_soc_codec_get_drvdata(codec);
-	int idx = -EINVAL;
+	int idx, rate;
-
-	idx = rl6231_calc_dmic_clk(rt5651->sysclk);
 
+	rate = rt5651->sysclk / rl6231_get_pre_div(rt5651->regmap,
+		RT5651_ADDA_CLK1, RT5651_I2S_PD1_SFT);
+	idx = rl6231_calc_dmic_clk(rate);
 	if (idx < 0)
 		dev_err(codec->dev, "Failed to set DMIC clock\n");
 	else

sound/soc/codecs/rt5670.c

@@ -683,10 +683,11 @@ static int set_dmic_clk(struct snd_soc_dapm_widget *w,
 {
 	struct snd_soc_codec *codec = snd_soc_dapm_to_codec(w->dapm);
 	struct rt5670_priv *rt5670 = snd_soc_codec_get_drvdata(codec);
-	int idx = -EINVAL;
+	int idx, rate;
-
-	idx = rl6231_calc_dmic_clk(rt5670->sysclk);
 
+	rate = rt5670->sysclk / rl6231_get_pre_div(rt5670->regmap,
+		RT5670_ADDA_CLK1, RT5670_I2S_PD1_SFT);
+	idx = rl6231_calc_dmic_clk(rate);
 	if (idx < 0)
 		dev_err(codec->dev, "Failed to set DMIC clock\n");
 	else

sound/soc/codecs/rt5677.c

@@ -917,8 +917,11 @@ static int set_dmic_clk(struct snd_soc_dapm_widget *w,
 {
 	struct snd_soc_codec *codec = snd_soc_dapm_to_codec(w->dapm);
 	struct rt5677_priv *rt5677 = snd_soc_codec_get_drvdata(codec);
-	int idx = rl6231_calc_dmic_clk(rt5677->lrck[RT5677_AIF1] << 8);
+	int idx, rate;
 
+	rate = rt5677->sysclk / rl6231_get_pre_div(rt5677->regmap,
+		RT5677_CLK_TREE_CTRL1, RT5677_I2S_PD1_SFT);
+	idx = rl6231_calc_dmic_clk(rate);
 	if (idx < 0)
 		dev_err(codec->dev, "Failed to set DMIC clock\n");
 	else