[PATCH] VIA VT8235 PCI quirk

Like many other southbridges from different manufacturers, VIA VT8235
chip has two non-standard BARs for power management and SMBus registers
(see the datasheet at http://www.via.com.tw).

This new quirk routine fixes boot problem with 2.6.13-rc2/rc6 kernels on
Targa Visionary 811 Athlon64 laptop, as reported by Mikael Pettersson
<mikpe@csd.uu.se>.

Signed-off-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 19 insertions, 0 deletions

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 8d0968bd527e..a9160ad16581 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -373,6 +373,25 @@ static void __devinit quirk_vt82c686_acpi(struct pci_dev *dev)
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA,     PCI_DEVICE_ID_VIA_82C686_4,     quirk_vt82c686_acpi );
 
+/*
+ * VIA VT8235 ISA Bridge: Two IO regions pointed to by words at
+ *      0x88 (128 bytes of power management registers)
+ *      0xd0 (16 bytes of SMB registers)
+ */
+static void __devinit quirk_vt8235_acpi(struct pci_dev *dev)
+{
+        u16 pm, smb;
+
+        pci_read_config_word(dev, 0x88, &pm);
+        pm &= PCI_BASE_ADDRESS_IO_MASK;
+        quirk_io_region(dev, pm, 128, PCI_BRIDGE_RESOURCES);
+
+        pci_read_config_word(dev, 0xd0, &smb);
+        smb &= PCI_BASE_ADDRESS_IO_MASK;
+        quirk_io_region(dev, smb, 16, PCI_BRIDGE_RESOURCES + 1);
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA,     PCI_DEVICE_ID_VIA_8235, quirk_vt8235_acpi);
+
 
 #ifdef CONFIG_X86_IO_APIC