ALSA: hda: 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/20191210063454.31603-22-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/hda_intel.c

@@ -790,6 +790,7 @@ static int azx_acquire_irq(struct azx *chip, int do_disconnect)
 		return -1;
 	}
 	bus->irq = chip->pci->irq;
+	chip->card->sync_irq = bus->irq;
 	pci_intx(chip->pci, !chip->msi);
 	return 0;
 }
@@ -1028,6 +1029,7 @@ static int azx_suspend(struct device *dev)
 	if (bus->irq >= 0) {
 		free_irq(bus->irq, chip);
 		bus->irq = -1;
+		chip->card->sync_irq = -1;
 	}
 
 	if (chip->msi)
@@ -1883,7 +1885,6 @@ static int azx_first_init(struct azx *chip)
 	}
 
 	pci_set_master(pci);
-	synchronize_irq(bus->irq);
 
 	gcap = azx_readw(chip, GCAP);
 	dev_dbg(card->dev, "chipset global capabilities = 0x%x\n", gcap);
@@ -2042,6 +2043,7 @@ static int disable_msi_reset_irq(struct azx *chip)
 
 	free_irq(bus->irq, chip);
 	bus->irq = -1;
+	chip->card->sync_irq = -1;
 	pci_disable_msi(chip->pci);
 	chip->msi = 0;
 	err = azx_acquire_irq(chip, 1);

sound/pci/hda/hda_tegra.c

@@ -170,7 +170,6 @@ static int __maybe_unused hda_tegra_runtime_suspend(struct device *dev)
 
 	if (chip && chip->running) {
 		azx_stop_chip(chip);
-		synchronize_irq(bus->irq);
 		azx_enter_link_reset(chip);
 	}
 	hda_tegra_disable_clocks(hda);
@@ -298,8 +297,7 @@ static int hda_tegra_first_init(struct azx *chip, struct platform_device *pdev)
 		return err;
 	}
 	bus->irq = irq_id;
-
-	synchronize_irq(bus->irq);
+	card->sync_irq = bus->irq;
 
 	gcap = azx_readw(chip, GCAP);
 	dev_dbg(card->dev, "chipset global capabilities = 0x%x\n", gcap);