[PATCH] MSI-K8T-Neo2-Fir OnboardSound and additional Soundcard

On the MSI-K8T-NEO2 FIR ( Athlon-64, Socket 939 with VIA-K8T800- Chipset
and onboard Sound,... ) the BIOS lets you choose "DISABLED" or "AUTO" for
the On-Board Sound Device.

If you add another PCI-Sound-Card the BIOS disables the on-board device.

So far I have a Quirk, that does set the correspondent BIT in the
PCI-registers to enable the soundcard.

But how to ensure that the code is executed ONLY on excactly this kind of
boards (not any other with similar Chipset)?

Cc: Jaroslav Kysela <[e-mail]>
Acked-by: Takashi Iwai <[e-mail]>
Cc: Lee Revell <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/pci/quirks.c

···
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_82375,	quirk_eisa_bridge );
 
 /*
+ * On the MSI-K8T-Neo2Fir Board, the internal Soundcard is disabled
+ * when a PCI-Soundcard is added. The BIOS only gives Options
+ * "Disabled" and "AUTO". This Quirk Sets the corresponding
+ * Register-Value to enable the Soundcard.
+ */
+static void __init k8t_sound_hostbridge(struct pci_dev *dev)
+{
+	unsigned char val;
+
+	printk(KERN_INFO "PCI: Quirk-MSI-K8T Soundcard On\n");
+	pci_read_config_byte(dev, 0x50, &val);
+	if (val == 0x88 || val == 0xc8) {
+		pci_write_config_byte(dev, 0x50, val & (~0x40));
+
+		/* Verify the Change for Status output */
+		pci_read_config_byte(dev, 0x50, &val);
+		if (val & 0x40)
+			printk(KERN_INFO "PCI: MSI-K8T soundcard still off\n");
+		else
+			printk(KERN_INFO "PCI: MSI-K8T soundcard on\n");
+	} else {
+		printk(KERN_INFO "PCI: Unexpected Value in PCI-Register: "
+					"no Change!\n");
+	}
+
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8237, k8t_sound_hostbridge);
+
+/*
  * On ASUS P4B boards, the SMBus PCI Device within the ICH2/4 southbridge
  * is not activated. The myth is that Asus said that they do not want the
  * users to be irritated by just another PCI Device in the Win98 device