ASoC: sun4i-i2s: Check for slave select bit

The newer SoCs do not have this setting. Instead they set the pin
direction. Add a check to see if the bit is valid and if so set
it accordingly.
Signed-off-by: Marcus Cooper <codekipper@gmail.com>
Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sunxi/sun4i-i2s.c

@@ -96,6 +96,7 @@
  * struct sun4i_i2s_quirks - Differences between SoC variants.
  *
  * @has_reset: SoC needs reset deasserted.
+ * @has_slave_select_bit: SoC has a bit to enable slave mode.
  * @reg_offset_txdata: offset of the tx fifo.
  * @sun4i_i2s_regmap: regmap config to use.
  * @mclk_offset: Value by which mclkdiv needs to be adjusted.
@@ -114,6 +115,7 @@
  */
 struct sun4i_i2s_quirks {
 	bool				has_reset;
+	bool				has_slave_select_bit;
 	unsigned int			reg_offset_txdata;	/* TX FIFO */
 	const struct regmap_config	*sun4i_i2s_regmap;
 	unsigned int			mclk_offset;
@@ -394,24 +396,25 @@ static int sun4i_i2s_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 	regmap_field_write(i2s->field_fmt_bclk, bclk_polarity);
 	regmap_field_write(i2s->field_fmt_lrclk, lrclk_polarity);
 
-	/* DAI clock master masks */
-	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
-	case SND_SOC_DAIFMT_CBS_CFS:
-		/* BCLK and LRCLK master */
-		val = SUN4I_I2S_CTRL_MODE_MASTER;
-		break;
-	case SND_SOC_DAIFMT_CBM_CFM:
-		/* BCLK and LRCLK slave */
-		val = SUN4I_I2S_CTRL_MODE_SLAVE;
-		break;
-	default:
-		return -EINVAL;
+	if (i2s->variant->has_slave_select_bit) {
+		/* DAI clock master masks */
+		switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+		case SND_SOC_DAIFMT_CBS_CFS:
+			/* BCLK and LRCLK master */
+			val = SUN4I_I2S_CTRL_MODE_MASTER;
+			break;
+		case SND_SOC_DAIFMT_CBM_CFM:
+			/* BCLK and LRCLK slave */
+			val = SUN4I_I2S_CTRL_MODE_SLAVE;
+			break;
+		default:
+			return -EINVAL;
+		}
+		regmap_update_bits(i2s->regmap, SUN4I_I2S_CTRL_REG,
+				   SUN4I_I2S_CTRL_MODE_MASK,
+				   val);
 	}
 
-	regmap_update_bits(i2s->regmap, SUN4I_I2S_CTRL_REG,
-			   SUN4I_I2S_CTRL_MODE_MASK,
-			   val);
-
 	/* Set significant bits in our FIFOs */
 	regmap_update_bits(i2s->regmap, SUN4I_I2S_FIFO_CTRL_REG,
 			   SUN4I_I2S_FIFO_CTRL_TX_MODE_MASK |
@@ -723,6 +726,7 @@ static const struct sun4i_i2s_quirks sun4i_a10_i2s_quirks = {
 	.field_fmt_sr		= REG_FIELD(SUN4I_I2S_FMT0_REG, 4, 5),
 	.field_fmt_bclk		= REG_FIELD(SUN4I_I2S_FMT0_REG, 6, 6),
 	.field_fmt_lrclk	= REG_FIELD(SUN4I_I2S_FMT0_REG, 7, 7),
+	.has_slave_select_bit	= true,
 	.field_fmt_mode		= REG_FIELD(SUN4I_I2S_FMT0_REG, 0, 1),
 	.field_txchanmap	= REG_FIELD(SUN4I_I2S_TX_CHAN_MAP_REG, 0, 31),
 	.field_rxchanmap	= REG_FIELD(SUN4I_I2S_RX_CHAN_MAP_REG, 0, 31),
@@ -739,6 +743,7 @@ static const struct sun4i_i2s_quirks sun6i_a31_i2s_quirks = {
 	.field_fmt_sr		= REG_FIELD(SUN4I_I2S_FMT0_REG, 4, 5),
 	.field_fmt_bclk		= REG_FIELD(SUN4I_I2S_FMT0_REG, 6, 6),
 	.field_fmt_lrclk	= REG_FIELD(SUN4I_I2S_FMT0_REG, 7, 7),
+	.has_slave_select_bit	= true,
 	.field_fmt_mode		= REG_FIELD(SUN4I_I2S_FMT0_REG, 0, 1),
 	.field_txchanmap	= REG_FIELD(SUN4I_I2S_TX_CHAN_MAP_REG, 0, 31),
 	.field_rxchanmap	= REG_FIELD(SUN4I_I2S_RX_CHAN_MAP_REG, 0, 31),