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    Subject[PATCH 001/001] PCI: PCI quirk for Asus A8V and A8V Deluxe motherboards
    From: Bauke Jan Douma <bjdouma@xs4all.nl>

    On ASUS A8V and A8V Deluxe boards, the onboard AC97 audio controller
    and MC97 modem controller are deactivated when a second PCI soundcard
    is present. This patch enables them.

    Signed-off-by: Bauke Jan Douma <bjdouma@xs4all.nl>

    ---

    When a PCI soundcard is present in an Asus A8V or A8V Deluxe system, the
    BIOS will disable the onboard AC97 and MC97 devices. This patch enables
    them. The soundcard now works on my A8V Deluxe, shows up in lspci output,
    in /proc/asound/cards, has mixer controls, plays audio, on both 32 bits
    and 64 bits systems.
    Patch is against 2.6.16-rc3.


    --- ./linux-2.6.16-rc3/drivers/pci/quirks.c.orig 2006-02-28 00:54:47.000000000 +0100
    +++ ./linux-2.6.16-rc3/drivers/pci/quirks.c 2006-02-28 21:34:46.000000000 +0100
    @@ -1074,6 +1074,37 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_S
    DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_963, quirk_sis_96x_smbus );
    DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_LPC, quirk_sis_96x_smbus );

    +/*
    + * 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 );
    +
    #ifdef CONFIG_X86_IO_APIC
    static void __init quirk_alder_ioapic(struct pci_dev *pdev)
    {
    -
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