The patch titled
pci-quirks: unhide 'Overflow' device on i828{6,7}5P/PE chipsets
has been added to the -mm tree. Its filename is
pci-quirks-unhide-overflow-device-on-i828675p-pe-chipsets-v2.patch
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------------------------------------------------------
Subject: pci-quirks: unhide 'Overflow' device on i828{6,7}5P/PE chipsets
Michal Miroslaw <mirq-linux@xxxxxxxxxxxx>
Some BIOSes hide 'overflow' device (dev #6) for i82875P/PE chipsets.
The same happens for i82865P/PE. Add a quirk to enable this device.
This allows i82875 EDAC driver to bind to chipset's dev #6 and not
dev #0 as the latter is used by AGP driver.
On my laptop (i82865P based) ACPI code is disabling this device
again in \_SB.PCI0._CRS method (called at least at PNP init time).
This can be easily worked around by patching DSDT.
Signed-off-by: Michal Miroslaw <mirq-linux@xxxxxxxxxxxx>
Cc: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>
Cc: Doug Thompson <norsk5@xxxxxxxxx>
On Fri, 9 Jan 2009 13:40:02 -0800
Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx> wrote:
>
> This one already got a NAK until Michal can figure out a way to prevent the
> SMM code on his machine from hiding this device periodically.
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/pci/quirks.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff -puN drivers/pci/quirks.c~pci-quirks-unhide-overflow-device-on-i828675p-pe-chipsets-v2 drivers/pci/quirks.c
--- a/drivers/pci/quirks.c~pci-quirks-unhide-overflow-device-on-i828675p-pe-chipsets-v2
+++ a/drivers/pci/quirks.c
@@ -1920,6 +1920,28 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_BR
PCI_DEVICE_ID_NX2_5709S,
quirk_brcm_570x_limit_vpd);
+/* Originally in EDAC sources for i82875P:
+ * Intel tells BIOS developers to hide device 6 which
+ * configures the overflow device access containing
+ * the DRBs - this is where we expose device 6.
+ * http://www.x86-secret.com/articles/tweak/pat/patsecrets-2.htm
+ */
+static void __devinit quirk_unhide_mch_dev6(struct pci_dev *dev)
+{
+ u8 reg;
+
+ if (pci_read_config_byte(dev, 0xF4, ®) == 0 && !(reg & 0x02)) {
+ dev_info(&dev->dev, "Enabling MCH 'Overflow' Device\n");
+ pci_write_config_byte(dev, 0xF4, reg | 0x02);
+ }
+}
+
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82865_HB,
+ quirk_unhide_mch_dev6);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82875_HB,
+ quirk_unhide_mch_dev6);
+
+
#ifdef CONFIG_PCI_MSI
/* Some chipsets do not support MSI. We cannot easily rely on setting
* PCI_BUS_FLAGS_NO_MSI in its bus flags because there are actually
_
Patches currently in -mm which might be from mirq-linux@xxxxxxxxxxxx are
pci-quirks-hp-hides-smbus-controller-in-compaq-nx9500-laptops.patch
pci-quirks-unhide-overflow-device-on-i828675p-pe-chipsets-v2.patch
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