Even after disabling interrupts on the module, it could be possible that irq handlers are still running. System hang is seen during suspend path. It was found that, there were pending writes on the HDA bus and clock was disabled by that time.
Above mentioned issue is fixed by clearing any pending irq handlers before disabling clocks and returning from hda suspend.
Suggested-by: Mohan Kumar mkumard@nvidia.com Suggested-by: Dara Ramesh dramesh@nvidia.com Signed-off-by: Sameer Pujar spujar@nvidia.com --- sound/pci/hda/hda_tegra.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/sound/pci/hda/hda_tegra.c b/sound/pci/hda/hda_tegra.c index 83befd8..97a176d 100644 --- a/sound/pci/hda/hda_tegra.c +++ b/sound/pci/hda/hda_tegra.c @@ -234,10 +234,12 @@ static int hda_tegra_suspend(struct device *dev) struct snd_card *card = dev_get_drvdata(dev); struct azx *chip = card->private_data; struct hda_tegra *hda = container_of(chip, struct hda_tegra, chip); + struct hdac_bus *bus = azx_bus(chip);
snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
azx_stop_chip(chip); + synchronize_irq(bus->irq); azx_enter_link_reset(chip); hda_tegra_disable_clocks(hda);