ALSA: hda - Add a white-list for MSI option

Created a white-list to enable MSI since some devices require MSI
explicitly due to BIOS/ACPI problems.  Simply using a quirk list.
As the first case, take HP Compaq CQ40.

Reference: Novell bnc#529971
	https://bugzilla.novell.com/show_bug.cgi?id=529971

Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 25 insertions, 1 deletions

diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 754de4f8201..20a66f85f0a 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -2299,6 +2299,30 @@ static void __devinit check_probe_mask(struct azx *chip, int dev)
         }
 }
 
+/*
+ * white-list for enable_msi
+ */
+static struct snd_pci_quirk msi_white_list[] __devinitdata = {
+        SND_PCI_QUIRK(0x103c, 0x3607, "HP Compa CQ40", 1),
+        {}
+};
+
+static void __devinit check_msi(struct azx *chip)
+{
+        const struct snd_pci_quirk *q;
+
+        chip->msi = enable_msi;
+        if (chip->msi)
+                return;
+        q = snd_pci_quirk_lookup(chip->pci, msi_white_list);
+        if (q) {
+                printk(KERN_INFO
+                       "hda_intel: msi for device %04x:%04x set to %d\n",
+                       q->subvendor, q->subdevice, q->value);
+                chip->msi = q->value;
+        }
+}
+
 
 /*
  * constructor
@@ -2333,7 +2357,7 @@ static int __devinit azx_create(struct snd_card *card, struct pci_dev *pci,
         chip->pci = pci;
         chip->irq = -1;
         chip->driver_type = driver_type;
-        chip->msi = enable_msi;
+        check_msi(chip);
         chip->dev_index = dev;
         INIT_WORK(&chip->irq_pending_work, azx_irq_pending_work);