[PATCH] unhide ICH6 SMBus - take 2

This patch unhides hidden SMBus on ICH6 chipset installed in
Asus M6V notebook. I would like to thank Michal Mleczko for
testing and help.

Signed-Off-By: Rudolf Marek <r.marek@sh.cvut.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

 drivers/pci/quirks.c |   24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

1 files changed, 24 insertions, 0 deletions

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 0663428a0e64..e1bd169cf55c 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -934,6 +934,12 @@ static void __init asus_hides_smbus_hostbridge(struct pci_dev *dev)
                         case 0x186a: /* M6Ne notebook */
                                 asus_hides_smbus = 1;
                         }
+                if (dev->device == PCI_DEVICE_ID_INTEL_82915GM_HB) {
+                        switch (dev->subsystem_device) {
+                        case 0x1882: /* M6V notebook */
+                                asus_hides_smbus = 1;
+                        }
+                }
         } else if (unlikely(dev->subsystem_vendor == PCI_VENDOR_ID_HP)) {
                 if (dev->device ==  PCI_DEVICE_ID_INTEL_82855PM_HB)
                         switch(dev->subsystem_device) {
@@ -978,6 +984,7 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_82865_HB,	asus
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL,   PCI_DEVICE_ID_INTEL_7205_0,     asus_hides_smbus_hostbridge );
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL,   PCI_DEVICE_ID_INTEL_82855PM_HB, asus_hides_smbus_hostbridge );
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL,   PCI_DEVICE_ID_INTEL_82855GM_HB, asus_hides_smbus_hostbridge );
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL,   PCI_DEVICE_ID_INTEL_82915GM_HB, asus_hides_smbus_hostbridge );
 
 static void __init asus_hides_smbus_lpc(struct pci_dev *dev)
 {
@@ -1002,6 +1009,23 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_82801CA_12,	as
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL,   PCI_DEVICE_ID_INTEL_82801DB_12, asus_hides_smbus_lpc );
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL,   PCI_DEVICE_ID_INTEL_82801EB_0,  asus_hides_smbus_lpc );
 
+static void __init asus_hides_smbus_lpc_ich6(struct pci_dev *dev)
+{
+        u32 val, rcba;
+        void __iomem *base;
+
+        if (likely(!asus_hides_smbus))
+                return;
+        pci_read_config_dword(dev, 0xF0, &rcba);
+        base = ioremap_nocache(rcba & 0xFFFFC000, 0x4000); /* use bits 31:14, 16 kB aligned */
+        if (base == NULL) return;
+        val=readl(base + 0x3418); /* read the Function Disable register, dword mode only */
+        writel(val & 0xFFFFFFF7, base + 0x3418); /* enable the SMBus device */
+        iounmap(base);
+        printk(KERN_INFO "PCI: Enabled ICH6/i801 SMBus device\n");
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL,   PCI_DEVICE_ID_INTEL_ICH6_1,     asus_hides_smbus_lpc_ich6 );
+
 /*
  * SiS 96x south bridge: BIOS typically hides SMBus device...
  */