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ALSA: fireface: reserve/release isochronous resources in pcm.hw_params/hw_free callbacks

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Once allocated, isochronous resources are available for packet
streaming, even if the streaming is cancelled. For this reason,
current implementation handles allocation of the resources and
starting packet streaming at the same time. However, this brings
complicated procedure to start packet streaming.

This commit separates the allocation and starting. The allocation is
done in pcm.hw_params callback and available till pcm.hw_free callback.
Even if any XRUN occurs, pcm.prepare callback is done to restart
packet streaming for allocated the resources.

There are two points to stop packet streaming; in pcm.hw_params and
pcm.prepare callbacks.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto
2019-06-02 16:12:56 +09:00
committed by Takashi Iwai
parent 60aec494b3
commit 55162d2bb0
3 changed files with 57 additions and 30 deletions
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2
sound/firewire/fireface/ff.h
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@@ -138,6 +138,8 @@ int snd_ff_stream_get_multiplier_mode(enum cip_sfc sfc,
enum snd_ff_stream_mode *mode);
int snd_ff_stream_init_duplex(struct snd_ff *ff);
void snd_ff_stream_destroy_duplex(struct snd_ff *ff);
int snd_ff_stream_reserve_duplex(struct snd_ff *ff, unsigned int rate);
void snd_ff_stream_release_duplex(struct snd_ff *ff);
int snd_ff_stream_start_duplex(struct snd_ff *ff, unsigned int rate);
void snd_ff_stream_stop_duplex(struct snd_ff *ff);
void snd_ff_stream_update_duplex(struct snd_ff *ff);