ASoC: da7213: add support for DSP modes

DSP modes are documented in the data sheet but not enabled in the driver.
The work-around already implemented for DA7218/9 is also required to
make sure the bit clock handling in DSP modes follows ASoC conventions.

Tested with ARD-AUDIO-DA7212 and Minnowmax Turbot boards
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Acked-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/da7213.c

@@ -1220,6 +1220,7 @@ static int da7213_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
 	struct snd_soc_codec *codec = codec_dai->codec;
 	struct da7213_priv *da7213 = snd_soc_codec_get_drvdata(codec);
 	u8 dai_clk_mode = 0, dai_ctrl = 0;
+	u8 dai_offset = 0;
 
 	/* Set master/slave mode */
 	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
@@ -1234,17 +1235,46 @@ static int da7213_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
 	}
 
 	/* Set clock normal/inverted */
-	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
-	case SND_SOC_DAIFMT_NB_NF:
-		break;
-	case SND_SOC_DAIFMT_NB_IF:
-		dai_clk_mode |= DA7213_DAI_WCLK_POL_INV;
-		break;
-	case SND_SOC_DAIFMT_IB_NF:
-		dai_clk_mode |= DA7213_DAI_CLK_POL_INV;
+	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+	case SND_SOC_DAIFMT_I2S:
+	case SND_SOC_DAIFMT_LEFT_J:
+	case SND_SOC_DAIFMT_RIGHT_J:
+		switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+		case SND_SOC_DAIFMT_NB_NF:
+			break;
+		case SND_SOC_DAIFMT_NB_IF:
+			dai_clk_mode |= DA7213_DAI_WCLK_POL_INV;
+			break;
+		case SND_SOC_DAIFMT_IB_NF:
+			dai_clk_mode |= DA7213_DAI_CLK_POL_INV;
+			break;
+		case SND_SOC_DAIFMT_IB_IF:
+			dai_clk_mode |= DA7213_DAI_WCLK_POL_INV |
+					DA7213_DAI_CLK_POL_INV;
+			break;
+		default:
+			return -EINVAL;
+		}
 		break;
-	case SND_SOC_DAIFMT_IB_IF:
-		dai_clk_mode |= DA7213_DAI_WCLK_POL_INV | DA7213_DAI_CLK_POL_INV;
+	case SND_SOC_DAI_FORMAT_DSP_A:
+	case SND_SOC_DAI_FORMAT_DSP_B:
+		/* The bclk is inverted wrt ASoC conventions */
+		switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+		case SND_SOC_DAIFMT_NB_NF:
+			dai_clk_mode |= DA7213_DAI_CLK_POL_INV;
+			break;
+		case SND_SOC_DAIFMT_NB_IF:
+			dai_clk_mode |= DA7213_DAI_WCLK_POL_INV |
+					DA7213_DAI_CLK_POL_INV;
+			break;
+		case SND_SOC_DAIFMT_IB_NF:
+			break;
+		case SND_SOC_DAIFMT_IB_IF:
+			dai_clk_mode |= DA7213_DAI_WCLK_POL_INV;
+			break;
+		default:
+			return -EINVAL;
+		}
 		break;
 	default:
 		return -EINVAL;
@@ -1261,6 +1291,13 @@ static int da7213_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
 	case SND_SOC_DAIFMT_RIGHT_J:
 		dai_ctrl |= DA7213_DAI_FORMAT_RIGHT_J;
 		break;
+	case SND_SOC_DAI_FORMAT_DSP_A: /* L data MSB after FRM LRC */
+		dai_ctrl |= DA7213_DAI_FORMAT_DSP;
+		dai_offset = 1;
+		break;
+	case SND_SOC_DAI_FORMAT_DSP_B: /* L data MSB during FRM LRC */
+		dai_ctrl |= DA7213_DAI_FORMAT_DSP;
+		break;
 	default:
 		return -EINVAL;
 	}
@@ -1271,6 +1308,7 @@ static int da7213_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
 	snd_soc_write(codec, DA7213_DAI_CLK_MODE, dai_clk_mode);
 	snd_soc_update_bits(codec, DA7213_DAI_CTRL, DA7213_DAI_FORMAT_MASK,
 			    dai_ctrl);
+	snd_soc_write(codec, DA7213_DAI_OFFSET, dai_offset);
 
 	return 0;
 }

sound/soc/codecs/da7213.h

@@ -188,6 +188,7 @@
 #define DA7213_DAI_FORMAT_I2S_MODE				(0x0 << 0)
 #define DA7213_DAI_FORMAT_LEFT_J				(0x1 << 0)
 #define DA7213_DAI_FORMAT_RIGHT_J				(0x2 << 0)
+#define DA7213_DAI_FORMAT_DSP					(0x3 << 0)
 #define DA7213_DAI_FORMAT_MASK					(0x3 << 0)
 #define DA7213_DAI_WORD_LENGTH_S16_LE				(0x0 << 2)
 #define DA7213_DAI_WORD_LENGTH_S20_LE				(0x1 << 2)