ALSA: virtuoso: handle DAC oversampling automatically

Remove the DAC Oversampling mixer control because this setting does not
make much sense.

For cards with the H6 daughterboard, 128x oversampling was disabled
anyway because these high MCLK frequency would not be compatible with
the connector cable.

For cards without the H6 daughterboard, 128x gives a slightly higher
output quality; there is no reason to reduce it to 64x except for saving
power, but then these cards have not been designed to be power efficient
anyway (the D2's blinkenlights cannot be disabled).

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/oxygen/xonar_pcm179x.c

@@ -223,7 +223,6 @@ struct xonar_pcm179x {
 	unsigned int dacs;
 	u8 pcm1796_regs[4][5];
 	unsigned int current_rate;
-	bool os_128;
 	bool h6;
 	bool hp_active;
 	s8 hp_gain_offset;
@@ -331,9 +330,14 @@ static void pcm1796_init(struct oxygen *chip)
 		PCM1796_DMF_DISABLED | PCM1796_FMT_24_I2S | PCM1796_ATLD;
 	data->pcm1796_regs[0][19 - PCM1796_REG_BASE] =
 		PCM1796_FLT_SHARP | PCM1796_ATS_1;
-	data->pcm1796_regs[0][20 - PCM1796_REG_BASE] = PCM1796_OS_64;
+	data->pcm1796_regs[0][20 - PCM1796_REG_BASE] =
+		data->h6 ? PCM1796_OS_64 : PCM1796_OS_128;
 	pcm1796_registers_init(chip);
 	data->current_rate = 48000;
+	if (!data->h6)
+		oxygen_write16_masked(chip, OXYGEN_I2S_MULTICH_FORMAT,
+				      OXYGEN_I2S_MCLK_512,
+				      OXYGEN_I2S_MCLK_MASK);
 }
 
 static void xonar_d2_init(struct oxygen *chip)
@@ -469,9 +473,12 @@ static void xonar_st_init(struct oxygen *chip)
 	data->broken_i2c = true;
 
 	oxygen_write16(chip, OXYGEN_I2S_A_FORMAT,
-		       OXYGEN_RATE_48000 | OXYGEN_I2S_FORMAT_I2S |
-		       OXYGEN_I2S_MCLK_256 | OXYGEN_I2S_BITS_16 |
-		       OXYGEN_I2S_MASTER | OXYGEN_I2S_BCLK_64);
+		       OXYGEN_RATE_48000 |
+		       OXYGEN_I2S_FORMAT_I2S |
+		       (data->h6 ? OXYGEN_I2S_MCLK_256 : OXYGEN_I2S_MCLK_512) |
+		       OXYGEN_I2S_BITS_16 |
+		       OXYGEN_I2S_MASTER |
+		       OXYGEN_I2S_BCLK_64);
 
 	xonar_st_init_i2c(chip);
 	cs2000_registers_init(chip);
@@ -556,11 +563,8 @@ static unsigned int mclk_from_rate(struct oxygen *chip, unsigned int rate)
 {
 	struct xonar_pcm179x *data = chip->model_data;
 
-	if (rate <= 32000)
+	if (rate <= 48000)
 		return data->h6 ? OXYGEN_I2S_MCLK_256 : OXYGEN_I2S_MCLK_512;
-	else if (rate <= 48000)
-		return data->os_128 && !data->h6
-			? OXYGEN_I2S_MCLK_512 : OXYGEN_I2S_MCLK_256;
 	else
 		return OXYGEN_I2S_MCLK_128;
 }
@@ -581,14 +585,10 @@ static void update_pcm1796_oversampling(struct oxygen *chip)
 	unsigned int i;
 	u8 reg;
 
-	if (data->current_rate <= 32000 && !data->h6)
+	if (data->current_rate <= 48000 && !data->h6)
 		reg = PCM1796_OS_128;
-	else if (data->current_rate <= 48000 && data->os_128 && !data->h6)
-		reg = PCM1796_OS_128;
-	else if (data->current_rate <= 96000 || data->os_128)
-		reg = PCM1796_OS_64;
 	else
-		reg = PCM1796_OS_32;
+		reg = PCM1796_OS_64;
 	for (i = 0; i < data->dacs; ++i)
 		pcm1796_write_cached(chip, i, 20, reg);
 }
@@ -644,16 +644,16 @@ static void update_cs2000_rate(struct oxygen *chip, unsigned int rate)
 			rate_mclk = OXYGEN_RATE_32000 | OXYGEN_I2S_MCLK_512;
 		break;
 	case 44100:
-		if (data->os_128 && !data->h6)
-			rate_mclk = OXYGEN_RATE_44100 | OXYGEN_I2S_MCLK_512;
-		else
+		if (data->h6)
 			rate_mclk = OXYGEN_RATE_44100 | OXYGEN_I2S_MCLK_256;
+		else
+			rate_mclk = OXYGEN_RATE_44100 | OXYGEN_I2S_MCLK_512;
 		break;
 	default: /* 48000 */
-		if (data->os_128 && !data->h6)
-			rate_mclk = OXYGEN_RATE_48000 | OXYGEN_I2S_MCLK_512;
-		else
+		if (data->h6)
 			rate_mclk = OXYGEN_RATE_48000 | OXYGEN_I2S_MCLK_256;
+		else
+			rate_mclk = OXYGEN_RATE_48000 | OXYGEN_I2S_MCLK_512;
 		break;
 	case 64000:
 		rate_mclk = OXYGEN_RATE_32000 | OXYGEN_I2S_MCLK_256;
@@ -767,60 +767,6 @@ static const struct snd_kcontrol_new rolloff_control = {
 	.put = rolloff_put,
 };
 
-static int os_128_info(struct snd_kcontrol *ctl, struct snd_ctl_elem_info *info)
-{
-	static const char *const names[2] = { "64x", "128x" };
-
-	info->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
-	info->count = 1;
-	info->value.enumerated.items = 2;
-	if (info->value.enumerated.item >= 2)
-		info->value.enumerated.item = 1;
-	strcpy(info->value.enumerated.name, names[info->value.enumerated.item]);
-	return 0;
-}
-
-static int os_128_get(struct snd_kcontrol *ctl,
-		      struct snd_ctl_elem_value *value)
-{
-	struct oxygen *chip = ctl->private_data;
-	struct xonar_pcm179x *data = chip->model_data;
-
-	value->value.enumerated.item[0] = data->os_128;
-	return 0;
-}
-
-static int os_128_put(struct snd_kcontrol *ctl,
-		      struct snd_ctl_elem_value *value)
-{
-	struct oxygen *chip = ctl->private_data;
-	struct xonar_pcm179x *data = chip->model_data;
-	int changed;
-
-	mutex_lock(&chip->mutex);
-	changed = value->value.enumerated.item[0] != data->os_128;
-	if (changed) {
-		data->os_128 = value->value.enumerated.item[0];
-		if (data->has_cs2000)
-			update_cs2000_rate(chip, data->current_rate);
-		oxygen_write16_masked(chip, OXYGEN_I2S_MULTICH_FORMAT,
-				      mclk_from_rate(chip, data->current_rate),
-				      OXYGEN_I2S_MCLK_MASK);
-		msleep(1);
-		update_pcm1796_oversampling(chip);
-	}
-	mutex_unlock(&chip->mutex);
-	return changed;
-}
-
-static const struct snd_kcontrol_new os_128_control = {
-	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
-	.name = "DAC Oversampling Playback Enum",
-	.info = os_128_info,
-	.get = os_128_get,
-	.put = os_128_put,
-};
-
 static const struct snd_kcontrol_new hdav_hdmi_control = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name = "HDMI Playback Switch",
@@ -1004,10 +950,6 @@ static int add_pcm1796_controls(struct oxygen *chip)
 				  snd_ctl_new1(&rolloff_control, chip));
 		if (err < 0)
 			return err;
-		err = snd_ctl_add(chip->card,
-				  snd_ctl_new1(&os_128_control, chip));
-		if (err < 0)
-			return err;
 	}
 	return 0;
 }