2 files changed, 98 insertions, 0 deletions

diff --git a/sound/soc/codecs/rt5670.c b/sound/soc/codecs/rt5670.c
index 0a027bc94399..0632b7458a53 100644
--- a/sound/soc/codecs/rt5670.c
+++ b/sound/soc/codecs/rt5670.c
@@ -590,6 +590,89 @@ static int can_use_asrc(struct snd_soc_dapm_widget *source,
         return 0;
 }
 
+
+/**
+ * rt5670_sel_asrc_clk_src - select ASRC clock source for a set of filters
+ * @codec: SoC audio codec device.
+ * @filter_mask: mask of filters.
+ * @clk_src: clock source
+ *
+ * The ASRC function is for asynchronous MCLK and LRCK. Also, since RT5670 can
+ * only support standard 32fs or 64fs i2s format, ASRC should be enabled to
+ * support special i2s clock format such as Intel's 100fs(100 * sampling rate).
+ * ASRC function will track i2s clock and generate a corresponding system clock
+ * for codec. This function provides an API to select the clock source for a
+ * set of filters specified by the mask. And the codec driver will turn on ASRC
+ * for these filters if ASRC is selected as their clock source.
+ */
+int rt5670_sel_asrc_clk_src(struct snd_soc_codec *codec,
+                            unsigned int filter_mask, unsigned int clk_src)
+{
+        unsigned int asrc2_mask = 0, asrc2_value = 0;
+        unsigned int asrc3_mask = 0, asrc3_value = 0;
+
+        if (clk_src > RT5670_CLK_SEL_SYS3)
+                return -EINVAL;
+
+        if (filter_mask & RT5670_DA_STEREO_FILTER) {
+                asrc2_mask |= RT5670_DA_STO_CLK_SEL_MASK;
+                asrc2_value = (asrc2_value & ~RT5670_DA_STO_CLK_SEL_MASK)
+                                | (clk_src <<  RT5670_DA_STO_CLK_SEL_SFT);
+        }
+
+        if (filter_mask & RT5670_DA_MONO_L_FILTER) {
+                asrc2_mask |= RT5670_DA_MONOL_CLK_SEL_MASK;
+                asrc2_value = (asrc2_value & ~RT5670_DA_MONOL_CLK_SEL_MASK)
+                                | (clk_src <<  RT5670_DA_MONOL_CLK_SEL_SFT);
+        }
+
+        if (filter_mask & RT5670_DA_MONO_R_FILTER) {
+                asrc2_mask |= RT5670_DA_MONOR_CLK_SEL_MASK;
+                asrc2_value = (asrc2_value & ~RT5670_DA_MONOR_CLK_SEL_MASK)
+                                | (clk_src <<  RT5670_DA_MONOR_CLK_SEL_SFT);
+        }
+
+        if (filter_mask & RT5670_AD_STEREO_FILTER) {
+                asrc2_mask |= RT5670_AD_STO1_CLK_SEL_MASK;
+                asrc2_value = (asrc2_value & ~RT5670_AD_STO1_CLK_SEL_MASK)
+                                | (clk_src <<  RT5670_AD_STO1_CLK_SEL_SFT);
+        }
+
+        if (filter_mask & RT5670_AD_MONO_L_FILTER) {
+                asrc3_mask |= RT5670_AD_MONOL_CLK_SEL_MASK;
+                asrc3_value = (asrc3_value & ~RT5670_AD_MONOL_CLK_SEL_MASK)
+                                | (clk_src <<  RT5670_AD_MONOL_CLK_SEL_SFT);
+        }
+
+        if (filter_mask & RT5670_AD_MONO_R_FILTER)  {
+                asrc3_mask |= RT5670_AD_MONOR_CLK_SEL_MASK;
+                asrc3_value = (asrc3_value & ~RT5670_AD_MONOR_CLK_SEL_MASK)
+                                | (clk_src <<  RT5670_AD_MONOR_CLK_SEL_SFT);
+        }
+
+        if (filter_mask & RT5670_UP_RATE_FILTER) {
+                asrc3_mask |= RT5670_UP_CLK_SEL_MASK;
+                asrc3_value = (asrc3_value & ~RT5670_UP_CLK_SEL_MASK)
+                                | (clk_src <<  RT5670_UP_CLK_SEL_SFT);
+        }
+
+        if (filter_mask & RT5670_DOWN_RATE_FILTER) {
+                asrc3_mask |= RT5670_DOWN_CLK_SEL_MASK;
+                asrc3_value = (asrc3_value & ~RT5670_DOWN_CLK_SEL_MASK)
+                                | (clk_src <<  RT5670_DOWN_CLK_SEL_SFT);
+        }
+
+        if (asrc2_mask)
+                snd_soc_update_bits(codec, RT5670_ASRC_2,
+                                    asrc2_mask, asrc2_value);
+
+        if (asrc3_mask)
+                snd_soc_update_bits(codec, RT5670_ASRC_3,
+                                    asrc3_mask, asrc3_value);
+        return 0;
+}
+EXPORT_SYMBOL_GPL(rt5670_sel_asrc_clk_src);
+
 /* Digital Mixer */
 static const struct snd_kcontrol_new rt5670_sto1_adc_l_mix[] = {
         SOC_DAPM_SINGLE("ADC1 Switch", RT5670_STO1_ADC_MIXER,
diff --git a/sound/soc/codecs/rt5670.h b/sound/soc/codecs/rt5670.h
index 82553b1726cd..0a67adbcfbc3 100644
--- a/sound/soc/codecs/rt5670.h
+++ b/sound/soc/codecs/rt5670.h
@@ -1969,6 +1969,21 @@ enum {
         RT5670_DMIC_DATA_GPIO5,
 };
 
+/* filter mask */
+enum {
+        RT5670_DA_STEREO_FILTER = 0x1,
+        RT5670_DA_MONO_L_FILTER = (0x1 << 1),
+        RT5670_DA_MONO_R_FILTER = (0x1 << 2),
+        RT5670_AD_STEREO_FILTER = (0x1 << 3),
+        RT5670_AD_MONO_L_FILTER = (0x1 << 4),
+        RT5670_AD_MONO_R_FILTER = (0x1 << 5),
+        RT5670_UP_RATE_FILTER   = (0x1 << 6),
+        RT5670_DOWN_RATE_FILTER = (0x1 << 7),
+};
+
+int rt5670_sel_asrc_clk_src(struct snd_soc_codec *codec,
+                            unsigned int filter_mask, unsigned int clk_src);
+
 struct rt5670_priv {
         struct snd_soc_codec *codec;
         struct rt5670_platform_data pdata;