ALSA: pcm core - Avoid jiffies check for devices with BATCH flag
The hardware devices with SNDRV_PCM_INFO_BATCH flag can't give the precise current position. And such hardwares have often big FIFO in addition to the ring buffer, and it screws up the jiffies check in pcm_lib.c. This patch adds a simple check of info flag so that the driver skips the jiffies check in snd_pcm_period_elapsed() when BATCH flag is set. Signed-off-by: Takashi Iwai <tiwai@suse.de>
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@ -249,6 +249,12 @@ static int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream *substream)
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new_hw_ptr = hw_base + pos;
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}
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}
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/* Skip the jiffies check for hardwares with BATCH flag.
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* Such hardware usually just increases the position at each IRQ,
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* thus it can't give any strange position.
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*/
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if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
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goto no_jiffies_check;
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hdelta = new_hw_ptr - old_hw_ptr;
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jdelta = jiffies - runtime->hw_ptr_jiffies;
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if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
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@ -272,6 +278,7 @@ static int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream *substream)
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hw_base -= hw_base % runtime->buffer_size;
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delta = 0;
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}
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no_jiffies_check:
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if (delta > runtime->period_size + runtime->period_size / 2) {
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hw_ptr_error(substream,
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"Lost interrupts? "
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