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ALSA: pcm: Add card sync_irq field

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Many PCI and other drivers performs snd_pcm_period_elapsed() simply in
its interrupt handler, so the sync_stop operation is just to call
synchronize_irq().  Instead of putting this call multiple times,
introduce the common card->sync_irq field.  When this field is set,
PCM core performs synchronize_irq() for sync-stop operation.  Each
driver just needs to copy its local IRQ number to card->sync_irq, and
that's all we need.

Link: https://lore.kernel.org/r/20191117085308.23915-8-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai
2019-11-17 09:53:07 +01:00
parent 1e850beea2
commit fabb26dcd1
3 changed files with 4 additions and 0 deletions
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1
include/sound/core.h
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@@ -117,6 +117,7 @@ struct snd_card {
struct device card_dev; /* cardX object for sysfs */ struct device card_dev; /* cardX object for sysfs */
const struct attribute_group *dev_groups[4]; /* assigned sysfs attr */ const struct attribute_group *dev_groups[4]; /* assigned sysfs attr */
bool registered; /* card_dev is registered? */ bool registered; /* card_dev is registered? */
int sync_irq; /* assigned irq, used for PCM sync */
wait_queue_head_t remove_sleep; wait_queue_head_t remove_sleep;
#ifdef CONFIG_PM #ifdef CONFIG_PM

1
sound/core/init.c
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@@ -215,6 +215,7 @@ int snd_card_new(struct device *parent, int idx, const char *xid,
init_waitqueue_head(&card->power_sleep); init_waitqueue_head(&card->power_sleep);
#endif #endif
init_waitqueue_head(&card->remove_sleep); init_waitqueue_head(&card->remove_sleep);
card->sync_irq = -1;
device_initialize(&card->card_dev); device_initialize(&card->card_dev);
card->card_dev.parent = parent; card->card_dev.parent = parent;

2
sound/core/pcm_native.c
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@@ -574,6 +574,8 @@ static void snd_pcm_sync_stop(struct snd_pcm_substream *substream)
substream->runtime->stop_operating = false; substream->runtime->stop_operating = false;
if (substream->ops->sync_stop) if (substream->ops->sync_stop)
substream->ops->sync_stop(substream); substream->ops->sync_stop(substream);
else if (substream->pcm->card->sync_irq > 0)
synchronize_irq(substream->pcm->card->sync_irq);
} }
} }