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ALSA: virtuoso: work around missing reset in the Xonar DS Windows driver

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For the WM8776 chip, this driver uses a different sample format and
more features than the Windows driver.  When rebooting from Linux into
Windows, the latter driver does not reset the chip but assumes all its
registers have their default settings, so we get garbled sound or, if
the output happened to be muted before rebooting, no sound.

To make that driver happy, hook our driver's cleanup function into the
shutdown notifier and ensure that the chip gets reset.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Reported-and-tested-by: Nathan Schagen
Cc: <stable@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Clemens Ladisch
2010-09-07 13:37:10 +02:00
committed by Takashi Iwai
parent a2acad8298
commit 4c25b93223
4 changed files with 21 additions and 3 deletions
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21
sound/pci/oxygen/oxygen_lib.c
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@@ -519,16 +519,21 @@ static void oxygen_init(struct oxygen *chip)
}
}
static void oxygen_card_free(struct snd_card *card)
static void oxygen_shutdown(struct oxygen *chip)
{
struct oxygen *chip = card->private_data;
spin_lock_irq(&chip->reg_lock);
chip->interrupt_mask = 0;
chip->pcm_running = 0;
oxygen_write16(chip, OXYGEN_DMA_STATUS, 0);
oxygen_write16(chip, OXYGEN_INTERRUPT_MASK, 0);
spin_unlock_irq(&chip->reg_lock);
}
static void oxygen_card_free(struct snd_card *card)
{
struct oxygen *chip = card->private_data;
oxygen_shutdown(chip);
if (chip->irq >= 0)
free_irq(chip->irq, chip);
flush_scheduled_work();
@@ -778,3 +783,13 @@ int oxygen_pci_resume(struct pci_dev *pci)
}
EXPORT_SYMBOL(oxygen_pci_resume);
#endif /* CONFIG_PM */
void oxygen_pci_shutdown(struct pci_dev *pci)
{
struct snd_card *card = pci_get_drvdata(pci);
struct oxygen *chip = card->private_data;
oxygen_shutdown(chip);
chip->model.cleanup(chip);
}
EXPORT_SYMBOL(oxygen_pci_shutdown);