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Merge "BACKPORT: ALSA: usb-audio: Eliminate noise at the start of DSD playback." into odroidn2-4.9.y

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Dongjin Kim
2019-03-18 15:31:53 +09:00
committed by Gerrit Code Review
parent 50f67111e2 e265143c2d
commit 06e6a318b5
1 changed files with 15 additions and 1 deletions
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16
sound/usb/endpoint.c
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@@ -638,7 +638,21 @@ 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);