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usb: gadget: f_uac1_legacy: set period size and buffer size

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The default period size is only 64 frames, this
will cause usb audio playback with noise via
internal audio codec. This patch sets the period
size to (snd->rate / 10), and also sets the buffer
size to snd->rate.

Change-Id: I4a4eb1b4dd79aec65f5c44eacd8a2fa101dfbd1b
Signed-off-by: William Wu <william.wu@rock-chips.com>
Signed-off-by: Frank Wang <frank.wang@rock-chips.com>
This commit is contained in:
William Wu
2019-11-13 12:56:20 +08:00
committed by Tao Huang
parent 3ecb9e48f7
commit 89f2299475
1 changed files with 4 additions and 0 deletions
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4
drivers/usb/gadget/function/u_uac1_legacy.c
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@@ -119,6 +119,10 @@ static int playback_default_hw_params(struct gaudio_snd_dev *snd)
snd->channels, 0);
_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_RATE,
snd->rate, 0);
_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
snd->rate / 10, 0);
_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
snd->rate, 0);
snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_HW_PARAMS, params);