ALSA: intel8x0: Support PCM sync_stop

The driver invokes snd_pcm_period_elapsed() simply from the interrupt
handler.  Set card->sync_irq for enabling the missing sync_stop PCM
operation.  It's cleared and reset dynamically at IRQ re-acquiring for
the PM resume, too.

Link: https://lore.kernel.org/r/20191210063454.31603-25-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/intel8x0.c

@@ -2592,6 +2592,7 @@ static int intel8x0_suspend(struct device *dev)
 	if (chip->irq >= 0) {
 		free_irq(chip->irq, chip);
 		chip->irq = -1;
+		card->sync_irq = -1;
 	}
 	return 0;
 }
@@ -2612,7 +2613,7 @@ static int intel8x0_resume(struct device *dev)
 		return -EIO;
 	}
 	chip->irq = pci->irq;
-	synchronize_irq(chip->irq);
+	card->sync_irq = chip->irq;
 
 	/* re-initialize mixer stuff */
 	if (chip->device_type == DEVICE_INTEL_ICH4 && !spdif_aclink) {
@@ -3092,6 +3093,7 @@ static int snd_intel8x0_create(struct snd_card *card,
 		return -EBUSY;
 	}
 	chip->irq = pci->irq;
+	card->sync_irq = chip->irq;
 
 	if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
 		snd_intel8x0_free(chip);

sound/pci/intel8x0m.c

@@ -999,6 +999,7 @@ static int intel8x0m_suspend(struct device *dev)
 	if (chip->irq >= 0) {
 		free_irq(chip->irq, chip);
 		chip->irq = -1;
+		card->sync_irq = -1;
 	}
 	return 0;
 }
@@ -1017,6 +1018,7 @@ static int intel8x0m_resume(struct device *dev)
 		return -EIO;
 	}
 	chip->irq = pci->irq;
+	card->sync_irq = chip->irq;
 	snd_intel8x0m_chip_init(chip, 0);
 	snd_ac97_resume(chip->ac97);
 
@@ -1191,6 +1193,7 @@ static int snd_intel8x0m_create(struct snd_card *card,
 		return -EBUSY;
 	}
 	chip->irq = pci->irq;
+	card->sync_irq = chip->irq;
 
 	if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
 		snd_intel8x0m_free(chip);