1 files changed, 31 insertions, 0 deletions

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index af4bc8e2cf83..d71c31df7fdf 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -1074,6 +1074,37 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI,	PCI_DEVICE_ID_SI_651,		quirk_sis_96x_
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI,      PCI_DEVICE_ID_SI_735,           quirk_sis_96x_compatible );
 
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI,      PCI_DEVICE_ID_SI_503,           quirk_sis_503 );
+/*
+ * On ASUS A8V and A8V Deluxe boards, the onboard AC97 audio controller
+ * and MC97 modem controller are disabled when a second PCI soundcard is
+ * present. This patch, tweaking the VT8237 ISA bridge, enables them.
+ * -- bjd
+ */
+static void __init asus_hides_ac97_lpc(struct pci_dev *dev)
+{
+        u8 val;
+        int asus_hides_ac97 = 0;
+
+        if (likely(dev->subsystem_vendor == PCI_VENDOR_ID_ASUSTEK)) {
+                if (dev->device == PCI_DEVICE_ID_VIA_8237)
+                        asus_hides_ac97 = 1;
+        }
+
+        if (!asus_hides_ac97)
+                return;
+
+        pci_read_config_byte(dev, 0x50, &val);
+        if (val & 0xc0) {
+                pci_write_config_byte(dev, 0x50, val & (~0xc0));
+                pci_read_config_byte(dev, 0x50, &val);
+                if (val & 0xc0)
+                        printk(KERN_INFO "PCI: onboard AC97/MC97 devices continue to play 'hide and seek'! 0x%x\n", val);
+                else
+                        printk(KERN_INFO "PCI: enabled onboard AC97/MC97 devices\n");
+        }
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA,     PCI_DEVICE_ID_VIA_8237, asus_hides_ac97_lpc );
+
 
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI,      PCI_DEVICE_ID_SI_961,           quirk_sis_96x_smbus );
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI,      PCI_DEVICE_ID_SI_962,           quirk_sis_96x_smbus );