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x86: Fix boot on Twinhead H12Y

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commit 80b3e55737 upstream.

Despite lots of investigation into why this is needed we don't
know or have an elegant cure. The only answer found on this
laptop is to mark a problem region as used so that Linux doesn't
put anything there.

Currently all the users add reserve= command lines and anyone
not knowing this needs to find the magic page that documents it.
Automate it instead.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Tested-and-bugfixed-by: Arne Fitzenreiter <arne@fitzenreiter.de>
Resolves-bug: https://bugzilla.kernel.org/show_bug.cgi?id=10231
Link: http://lkml.kernel.org/r/20120515174347.5109.94551.stgit@bluebook
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alan Cox 2012-05-15 18:44:15 +01:00 • committed by Greg Kroah-Hartman
commit b69eba70b9
1 changed files with 17 additions and 0 deletions
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17
arch/x86/pci/fixup.c
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@ -521,3 +521,20 @@ static void sb600_disable_hpet_bar(struct pci_dev *dev)
}
}
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_ATI, 0x4385, sb600_disable_hpet_bar);
/*
* Twinhead H12Y needs us to block out a region otherwise we map devices
* there and any access kills the box.
*
* See: https://bugzilla.kernel.org/show_bug.cgi?id=10231
*
* Match off the LPC and svid/sdid (older kernels lose the bridge subvendor)
*/
static void __devinit twinhead_reserve_killing_zone(struct pci_dev *dev)
{
if (dev->subsystem_vendor == 0x14FF && dev->subsystem_device == 0xA003) {
pr_info("Reserving memory on Twinhead H12Y\n");
request_mem_region(0xFFB00000, 0x100000, "twinhead");
}
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x27B9, twinhead_reserve_killing_zone);