Can this patch to drivers/pci/quirks.c be incorporated into the kernel? It
fixes a bug in some BIOSes that hide the M7101 PMU and SMBUS device and is
needed for some boards to use the i2c-ali15x3 driver. lm_sensors includes a
module that makes that device visible. i got this patch from the kernel mailing
list and adapted it to the kernel coding style.
Maarten Deprez
--- linux-2.6.11-rc2-mm1/drivers/pci/quirks.c.orig 2005-01-28
10:55:20.524801664 +0100
+++ linux-2.6.11-rc2-mm1/drivers/pci/quirks.c 2005-01-28 11:24:34.626137728
+0100
@@ -281,6 +281,55 @@
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M7101,
quirk_ali7101_acpi );
/*
+ * ALi 1533 fixup to enable the M7101 SMBus Controller
+ * ported from prog/hotplug of the lm_sensors
+ * package
+ */
+static void __devinit quirk_ali1533_smbus(struct pci_dev *dev)
+{
+ u8 val = 0;
+ struct pci_dev *m7101;
+
+ m7101 = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M7101, NULL);
+
+ if (m7101)
+ return;
+
+ /* enable device */
+
+ pci_read_config_byte(dev, 0x5F, &val);
+
+ if (val & 0x04) {
+ pci_write_config_byte(dev, 0x5F, val & ~0x04);
+ pci_read_config_byte(dev, 0x5F, &val);
+
+ if (val & 0x4) {
+ printk(KERN_INFO "PCI: Failed to enable M7101 SMBus
Controller\n");
+ return;
+ }
+ }
+
+ m7101 = pci_scan_single_device(dev->bus, 0x18);
+
+ /* unlock registers */
+
+ if (pci_read_config_byte(m7101, 0x5B, &val)) {
+ printk(KERN_INFO "PCI: Failed to enable M7101 SMBus
Controller\n");
+ return;
+ }
+
+ if (val & 0x06) {
+ if (pci_write_config_byte(m7101, 0x5B, val & ~0x06)) {
+ printk(KERN_INFO "PCI: Failed to enable M7101 SMBus
Controller\n");
+ return;
+ }
+ }
+
+ printk(KERN_INFO "PCI: Enabled M7101 SMBus Controller\n");
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533,
quirk_ali1533_smbus );
+
+/*
* PIIX4 ACPI: Two IO regions pointed to by longwords at
* 0x40 (64 bytes of ACPI registers)
* 0x90 (32 bytes of SMB registers)
