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: Stephen Hemminger <shemminger@xxxxxxxx>
--- linux-2.6.orig/sound/pci/hda/hda_intel.c 2006-07-13 12:53:49.000000000 -0700
+++ linux-2.6/sound/pci/hda/hda_intel.c 2006-08-15 15:24:12.000000000 -0700
@@ -55,6 +55,7 @@
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_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 */
@@ -1402,8 +1405,10 @@
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);
@@ -1486,6 +1491,9 @@
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);
-------------------------------------------------------------------------
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