From 0cbf00980f0fc4cc064a15ab3dfce19b5fae9130 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Wed, 29 Oct 2008 16:18:25 +0100 Subject: ALSA: hda - Add reboot notifier The current snd-hda-intel driver seems blocking the power-off on some devices like eeepc. Although this is likely a BIOS problem, we can add a workaround by disabling IRQ lines before power-off operation. This patch adds the reboot notifier to achieve it. The detailed problem description is found in bug#11889: http://bugme.linux-foundation.org/show_bug.cgi?id=11889 Tested-by: Luiz Fernando N. Capitulino Cc: stable@kernel.org Signed-off-by: Takashi Iwai --- sound/pci/hda/hda_intel.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) (limited to 'sound/pci') diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c index 9f316c1b279..c04ac38e2b2 100644 --- a/sound/pci/hda/hda_intel.c +++ b/sound/pci/hda/hda_intel.c @@ -45,6 +45,7 @@ #include #include #include +#include #include #include #include "hda_codec.h" @@ -397,6 +398,9 @@ struct azx { /* for pending irqs */ struct work_struct irq_pending_work; + + /* reboot notifier (for mysterious hangup problem at power-down) */ + struct notifier_block reboot_notifier; }; /* driver types */ @@ -1978,6 +1982,28 @@ static int azx_resume(struct pci_dev *pci) #endif /* CONFIG_PM */ +/* + * reboot notifier for hang-up problem at power-down + */ +static int azx_halt(struct notifier_block *nb, unsigned long event, void *buf) +{ + struct azx *chip = container_of(nb, struct azx, reboot_notifier); + azx_stop_chip(chip); + return NOTIFY_OK; +} + +static void azx_notifier_register(struct azx *chip) +{ + chip->reboot_notifier.notifier_call = azx_halt; + register_reboot_notifier(&chip->reboot_notifier); +} + +static void azx_notifier_unregister(struct azx *chip) +{ + if (chip->reboot_notifier.notifier_call) + unregister_reboot_notifier(&chip->reboot_notifier); +} + /* * destructor */ @@ -1985,6 +2011,8 @@ static int azx_free(struct azx *chip) { int i; + azx_notifier_unregister(chip); + if (chip->initialized) { azx_clear_irq_pending(chip); for (i = 0; i < chip->num_streams; i++) @@ -2348,6 +2376,7 @@ static int __devinit azx_probe(struct pci_dev *pci, pci_set_drvdata(pci, card); chip->running = 1; power_down_all_codecs(chip); + azx_notifier_register(chip); dev++; return err; -- cgit v1.2.3