Merge pull request #340 from epicfrequency/patch-1

ALSA: usb-audio: Eliminate noise at the start of DSD playback.

Author: mdrjr

sound/usb/endpoint.c

@@ -592,7 +592,21 @@ static int data_ep_set_params(struct snd_usb_endpoint *ep,
 
 	ep->datainterval = fmt->datainterval;
 	ep->stride = frame_bits >> 3;
-	ep->silence_value = pcm_format == SNDRV_PCM_FORMAT_U8 ? 0x80 : 0;
+	
+	switch (pcm_format) {
+	case SNDRV_PCM_FORMAT_U8:
+		ep->silence_value = 0x80;
+		break;
+	case SNDRV_PCM_FORMAT_DSD_U8:
+	case SNDRV_PCM_FORMAT_DSD_U16_LE:
+	case SNDRV_PCM_FORMAT_DSD_U32_LE:
+	case SNDRV_PCM_FORMAT_DSD_U16_BE:
+	case SNDRV_PCM_FORMAT_DSD_U32_BE:
+		ep->silence_value = 0x69;
+		break;
+	default:
+		ep->silence_value = 0;
+	}
 
 	/* assume max. frequency is 25% higher than nominal */
 	ep->freqmax = ep->freqn + (ep->freqn >> 2);