ALSA: usb-audio: avoid setting of sample rate multiple times on bus

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Some of userland applications call 'snd_pcm_hw_params()' and
'snd_pcm_hw_prepare()' sequentially, which means 'snd_pcm_hw_prepare()'
is called twice and the second 'snd_pcm_hw_prepare()' is called in
'SNDRV_PCM_STATE_PREPARED' state.

Some devices are not able to manage this and they will stop playback
if the sample rate will be configured several times over USB protocol.

V2: updated Changelog

Signed-off-by: Daniel Girnus <dgirnus@de.adit-jv.com>
Signed-off-by: Jens Lorenz <jlorenz@de.adit-jv.com>
Signed-off-by: Jiada Wang <jiada_wang@mentor.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

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Daniel Girnus 2016-12-06 14:46:15 +09:00 • committed by Takashi Iwai

parent 4763601a56

commit 1e2e3fe480

1 changed files with 11 additions and 10 deletions

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sound/usb/pcm.c

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