ALSA: virtuoso: fix silent analog output on Xonar Essence ST Deluxe

Commit dd203fa97b (ALSA: virtuoso: remove non-working controls on
Essence ST Deluxe) made it impossible to adjust the volume after the
driver initialized it to muted.

Ensure that those DACs that can be accessed with I2C are initialized
to the same volume that is the reset default of the DAC without I2C.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Cc: 2.6.38+ <stable@kernel.org>

sound/pci/oxygen/xonar_pcm179x.c

@@ -327,8 +327,10 @@ static void pcm1796_init(struct oxygen *chip)
 {
 	struct xonar_pcm179x *data = chip->model_data;
 
-	data->pcm1796_regs[0][18 - PCM1796_REG_BASE] = PCM1796_MUTE |
+	data->pcm1796_regs[0][18 - PCM1796_REG_BASE] =
 		PCM1796_DMF_DISABLED | PCM1796_FMT_24_I2S | PCM1796_ATLD;
+	if (!data->broken_i2c)
+		data->pcm1796_regs[0][18 - PCM1796_REG_BASE] |= PCM1796_MUTE;
 	data->pcm1796_regs[0][19 - PCM1796_REG_BASE] =
 		PCM1796_FLT_SHARP | PCM1796_ATS_1;
 	data->pcm1796_regs[0][20 - PCM1796_REG_BASE] =
@@ -1123,6 +1125,7 @@ int __devinit get_xonar_pcm179x_model(struct oxygen *chip,
 			chip->model.control_filter = xonar_st_h6_control_filter;
 			chip->model.dac_channels_pcm = 8;
 			chip->model.dac_channels_mixer = 8;
+			chip->model.dac_volume_min = 255;
 			chip->model.dac_mclks = OXYGEN_MCLKS(256, 128, 128);
 			break;
 		}