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Commit 0cbf0098 authored by Takashi Iwai's avatar Takashi Iwai
Browse files

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: default avatarLuiz Fernando N. Capitulino <lcapitulino@mandriva.com.br>
Cc: stable@kernel.org
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent c1e99bd9

sound/pci/hda/hda_intel.c

+29 −0
Original line number Diff line number Diff line
@@ -45,6 +45,7 @@ 
#include <linux/slab.h>

#include <linux/pci.h>

#include <linux/mutex.h>

#include <linux/reboot.h>

#include <sound/core.h>

#include <sound/initval.h>

#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;