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Commit 7376d013 authored by Stephen Hemminger's avatar Stephen Hemminger Committed by Jaroslav Kysela
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[ALSA] intel_hda: MSI support 



Simple patch to enable Message Signalled Interrupts for the HDA Intel
audio controller.  Tested with:
 Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) High Definition Audio Controller (rev 03)
MSI is better because it means audio doesn't end up sharing IRQ with USB.

Signed-off-by: default avatarStephen Hemminger <shemminger@osdl.org>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
Signed-off-by: default avatarJaroslav Kysela <perex@suse.cz>
parent 93f09c4c

sound/pci/hda/hda_intel.c

+9 −1
Original line number Diff line number Diff line
@@ -55,6 +55,7 @@ static char *model; 
static int position_fix;

static int probe_mask = -1;

static int single_cmd;

static int disable_msi;



module_param(index, int, 0444);

MODULE_PARM_DESC(index, "Index value for Intel HD audio interface.");
@@ -68,6 +69,8 @@ module_param(probe_mask, int, 0444); 
MODULE_PARM_DESC(probe_mask, "Bitmask to probe codecs (default = -1).");

module_param(single_cmd, bool, 0444);

MODULE_PARM_DESC(single_cmd, "Use single command to communicate with codecs (for debugging only).");

module_param(disable_msi, int, 0);

MODULE_PARM_DESC(disable_msi, "Disable Message Signaled Interrupt (MSI)");





/* just for backward compatibility */
@@ -1418,8 +1421,10 @@ static int azx_free(struct azx *chip) 
		msleep(1);

	}



	if (chip->irq >= 0)

	if (chip->irq >= 0) {

		pci_disable_msi(chip->pci);

		free_irq(chip->irq, (void*)chip);

	}

	if (chip->remap_addr)

		iounmap(chip->remap_addr);
@@ -1502,6 +1507,9 @@ static int __devinit azx_create(struct snd_card *card, struct pci_dev *pci, 
		goto errout;

	}



	if (!disable_msi)

		pci_enable_msi(pci);



	if (request_irq(pci->irq, azx_interrupt, IRQF_DISABLED|IRQF_SHARED,

			"HDA Intel", (void*)chip)) {

		snd_printk(KERN_ERR SFX "unable to grab IRQ %d\n", pci->irq);