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Commit 64b6acf6 authored by Ricardo Biehl Pasquali's avatar Ricardo Biehl Pasquali Committed by Takashi Iwai
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ALSA: pcm: Update hardware pointer before start capture 



This ensures the transfer loop won't waste a run to read
the few frames (if any) between start and hw_ptr update.
It will wait for the next interrupt with wait_for_avail().

Signed-off-by: default avatarRicardo Biehl Pasquali <pasqualirb@gmail.com>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 70f7922c

sound/core/pcm_lib.c

+5 −3
Original line number Diff line number Diff line
@@ -2172,6 +2172,10 @@ snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream, 
	if (err < 0)

		goto _end_unlock;



	runtime->twake = runtime->control->avail_min ? : 1;

	if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)

		snd_pcm_update_hw_ptr(substream);



	if (!is_playback &&

	    runtime->status->state == SNDRV_PCM_STATE_PREPARED) {

		if (size >= runtime->start_threshold) {
@@ -2185,10 +2189,8 @@ snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream, 
		}

	}



	runtime->twake = runtime->control->avail_min ? : 1;

	if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)

		snd_pcm_update_hw_ptr(substream);

	avail = snd_pcm_avail(substream);



	while (size > 0) {

		snd_pcm_uframes_t frames, appl_ptr, appl_ofs;

		snd_pcm_uframes_t cont;