Acked-by: Doug Thompson <dougthompson@xxxxxxxxxxxx>
--- On Tue, 5/12/09, akpm@xxxxxxxxxxxxxxxxxxxx <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
> From: akpm@xxxxxxxxxxxxxxxxxxxx <akpm@xxxxxxxxxxxxxxxxxxxx>
> Subject: [patch 2/2] pci-quirks: unhide 'Overflow' device on i828{6,7}5P/PE chipsets
> To: jbarnes@xxxxxxxxxxxxxxxx
> Cc: linux-pci@xxxxxxxxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, mirq-linux@xxxxxxxxxxxx, norsk5@xxxxxxxxx
> Date: Tuesday, May 12, 2009, 2:49 PM
> 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.
>
> [akpm@xxxxxxxxxxxxxxxxxxxx:
> coding-style fixes]
> Signed-off-by: Michal Miroslaw <mirq-linux@xxxxxxxxxxxx>
> Cc: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>
> Cc: Doug Thompson <norsk5@xxxxxxxxx>
> 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
> @@ -2017,6 +2017,28 @@
> 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
> _
>
--
To unsubscribe from this list: send the line "unsubscribe linux-pci" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
