ASoC: TWL4030: Enable/disable voice digital filters

Enable TWL4030 VTXL/VTXR and VRX digital filters for uplink
and downlink paths, respectively.

This patch also corrects voice 8/16kHz mode selection bit
(SEL_16K) of CODEC_MODE register.

Signed-off-by: Misael Lopez Cruz <x0052729@ti.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@nokia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/twl4030.c

@@ -1629,6 +1629,28 @@ static int twl4030_set_dai_fmt(struct snd_soc_dai *codec_dai,
 	return 0;
 }
 
+/* In case of voice mode, the RX1 L(VRX) for downlink and the TX2 L/R
+ * (VTXL, VTXR) for uplink has to be enabled/disabled. */
+static void twl4030_voice_enable(struct snd_soc_codec *codec, int direction,
+				int enable)
+{
+	u8 reg, mask;
+
+	reg = twl4030_read_reg_cache(codec, TWL4030_REG_OPTION);
+
+	if (direction == SNDRV_PCM_STREAM_PLAYBACK)
+		mask = TWL4030_ARXL1_VRX_EN;
+	else
+		mask = TWL4030_ATXL2_VTXL_EN | TWL4030_ATXR2_VTXR_EN;
+
+	if (enable)
+		reg |= mask;
+	else
+		reg &= ~mask;
+
+	twl4030_write(codec, TWL4030_REG_OPTION, reg);
+}
+
 static int twl4030_voice_startup(struct snd_pcm_substream *substream,
 		struct snd_soc_dai *dai)
 {
@@ -1665,6 +1687,17 @@ static int twl4030_voice_startup(struct snd_pcm_substream *substream,
 	return 0;
 }
 
+static void twl4030_voice_shutdown(struct snd_pcm_substream *substream,
+				struct snd_soc_dai *dai)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_device *socdev = rtd->socdev;
+	struct snd_soc_codec *codec = socdev->card->codec;
+
+	/* Enable voice digital filters */
+	twl4030_voice_enable(codec, substream->stream, 0);
+}
+
 static int twl4030_voice_hw_params(struct snd_pcm_substream *substream,
 		struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
 {
@@ -1673,6 +1706,9 @@ static int twl4030_voice_hw_params(struct snd_pcm_substream *substream,
 	struct snd_soc_codec *codec = socdev->card->codec;
 	u8 old_mode, mode;
 
+	/* Enable voice digital filters */
+	twl4030_voice_enable(codec, substream->stream, 1);
+
 	/* bit rate */
 	old_mode = twl4030_read_reg_cache(codec, TWL4030_REG_CODEC_MODE)
 		& ~(TWL4030_CODECPDZ);
@@ -1780,6 +1816,7 @@ static struct snd_soc_dai_ops twl4030_dai_ops = {
 
 static struct snd_soc_dai_ops twl4030_dai_voice_ops = {
 	.startup	= twl4030_voice_startup,
+	.shutdown	= twl4030_voice_shutdown,
 	.hw_params	= twl4030_voice_hw_params,
 	.set_sysclk	= twl4030_voice_set_dai_sysclk,
 	.set_fmt	= twl4030_voice_set_dai_fmt,

sound/soc/codecs/twl4030.h

@@ -110,7 +110,7 @@
 #define TWL4030_APLL_RATE_44100		0x90
 #define TWL4030_APLL_RATE_48000		0xA0
 #define TWL4030_APLL_RATE_96000		0xE0
-#define TWL4030_SEL_16K			0x04
+#define TWL4030_SEL_16K			0x08
 #define TWL4030_CODECPDZ		0x02
 #define TWL4030_OPT_MODE		0x01
 #define TWL4030_OPTION_1		(1 << 0)