Commit 26c56dc0 authored by Michal Miroslaw's avatar Michal Miroslaw Committed by Jesse Barnes

PCI quirk: unhide 'Overflow' device on i828{6,7}5P/PE chipsets

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.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: default avatarMichal Miroslaw <mirq-linux@rere.qmqm.pl>
Acked-by: default avatarDoug Thompson <norsk5@yahoo.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
parent 4096ed0f
......@@ -2017,6 +2017,28 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_BROADCOM,
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, &reg) == 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
......
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