ALSA: virtuoso: configure correct master clock frequency on the CS2000

The clock output of the CS2000, which is used as master clock for the
DACs, was using half the actual master clock frequency for some reason.
Using the theoretically correct frequency seems also to work in practice.
Signed-off-by: NClemens Ladisch <clemens@ladisch.de>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

sound/pci/oxygen/xonar_pcm179x.c

@@ -467,7 +467,7 @@ static void xonar_st_init(struct oxygen *chip)
 
 	oxygen_write16(chip, OXYGEN_I2S_A_FORMAT,
 		       OXYGEN_RATE_48000 | OXYGEN_I2S_FORMAT_I2S |
-		       OXYGEN_I2S_MCLK_128 | OXYGEN_I2S_BITS_16 |
+		       OXYGEN_I2S_MCLK_256 | OXYGEN_I2S_BITS_16 |
 		       OXYGEN_I2S_MASTER | OXYGEN_I2S_BCLK_64);
 
 	xonar_st_init_i2c(chip);
@@ -635,41 +635,40 @@ static void update_cs2000_rate(struct oxygen *chip, unsigned int rate)
 	u8 rate_mclk, reg;
 
 	switch (rate) {
-		/* XXX Why is the I2S A MCLK half the actual I2S MCLK? */
 	case 32000:
-		rate_mclk = OXYGEN_RATE_32000 | OXYGEN_I2S_MCLK_256;
+		rate_mclk = OXYGEN_RATE_32000 | OXYGEN_I2S_MCLK_512;
 		break;
 	case 44100:
 		if (data->os_128)
-			rate_mclk = OXYGEN_RATE_44100 | OXYGEN_I2S_MCLK_256;
+			rate_mclk = OXYGEN_RATE_44100 | OXYGEN_I2S_MCLK_512;
 		else
-			rate_mclk = OXYGEN_RATE_44100 | OXYGEN_I2S_MCLK_128;
+			rate_mclk = OXYGEN_RATE_44100 | OXYGEN_I2S_MCLK_256;
 		break;
 	default: /* 48000 */
 		if (data->os_128)
-			rate_mclk = OXYGEN_RATE_48000 | OXYGEN_I2S_MCLK_256;
+			rate_mclk = OXYGEN_RATE_48000 | OXYGEN_I2S_MCLK_512;
 		else
-			rate_mclk = OXYGEN_RATE_48000 | OXYGEN_I2S_MCLK_128;
+			rate_mclk = OXYGEN_RATE_48000 | OXYGEN_I2S_MCLK_256;
 		break;
 	case 64000:
-		rate_mclk = OXYGEN_RATE_32000 | OXYGEN_I2S_MCLK_256;
+		rate_mclk = OXYGEN_RATE_32000 | OXYGEN_I2S_MCLK_512;
 		break;
 	case 88200:
-		rate_mclk = OXYGEN_RATE_44100 | OXYGEN_I2S_MCLK_256;
+		rate_mclk = OXYGEN_RATE_44100 | OXYGEN_I2S_MCLK_512;
 		break;
 	case 96000:
-		rate_mclk = OXYGEN_RATE_48000 | OXYGEN_I2S_MCLK_256;
+		rate_mclk = OXYGEN_RATE_48000 | OXYGEN_I2S_MCLK_512;
 		break;
 	case 176400:
-		rate_mclk = OXYGEN_RATE_44100 | OXYGEN_I2S_MCLK_256;
+		rate_mclk = OXYGEN_RATE_44100 | OXYGEN_I2S_MCLK_512;
 		break;
 	case 192000:
-		rate_mclk = OXYGEN_RATE_48000 | OXYGEN_I2S_MCLK_256;
+		rate_mclk = OXYGEN_RATE_48000 | OXYGEN_I2S_MCLK_512;
 		break;
 	}
 	oxygen_write16_masked(chip, OXYGEN_I2S_A_FORMAT, rate_mclk,
 			      OXYGEN_I2S_RATE_MASK | OXYGEN_I2S_MCLK_MASK);
-	if ((rate_mclk & OXYGEN_I2S_MCLK_MASK) <= OXYGEN_I2S_MCLK_128)
+	if ((rate_mclk & OXYGEN_I2S_MCLK_MASK) <= OXYGEN_I2S_MCLK_256)
 		reg = CS2000_REF_CLK_DIV_1;
 	else
 		reg = CS2000_REF_CLK_DIV_2;