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Stephen Kitt a70b95c017 agp: ensure GART has an address before enabling it 
Some BIOSs (eg.  the AMI BIOS on the Asus P4P800 motherboard) don't
initialise the GART address, and pcibios_assign_resources() can ignore it
because it can be marked as a host bridge (see
https://bugzilla.kernel.org/show_bug.cgi?id=24392#c5 for details).  This
was handled correctly up to 2.6.35, but the pci_enable_device() cleanup in
2.6.36 96576a9e1a ("agp: intel-agp: do not use PCI resources before
pci_enable_device()") means that the kernel tries to enable the GART
before assigning it an address; in such cases the GART overlaps with other
device assignments and ends up being disabled.

This patch fixes https://bugzilla.kernel.org/show_bug.cgi?id=24392

Note that I imagine efficeon-agp.c probably has the same problem, but
I can't test that and I'd like to make sure this patch is suitable for
-stable (since 2.6.36 and 2.6.37 are affected).

Signed-off-by: Stephen Kitt <steve@sk2.org>
Cc: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: Maciej Rutecki <maciej.rutecki@gmail.com>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Kulikov Vasiliy <segooon@gmail.com>
Cc: Florian Mickler <florian@mickler.org>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2011-02-04 09:43:57 +10:00
..
agp.h agp: kill agp_flush_chipset and corresponding ioctl 2010-11-23 20:14:45 +00:00
ali-agp.c
alpha-agp.c
amd-k7-agp.c amd-k7-agp: remove non-x86 code 2011-02-04 09:42:24 +10:00
amd64-agp.c x86, amd-nb: Cleanup AMD northbridge caching code 2010-11-18 15:53:05 +01:00
ati-agp.c
backend.c agp: kill agp_(map|unmap)_page 2010-09-21 11:36:11 +01:00
compat_ioctl.c agp: kill agp_flush_chipset and corresponding ioctl 2010-11-23 20:14:45 +00:00
compat_ioctl.h agp: kill agp_flush_chipset and corresponding ioctl 2010-11-23 20:14:45 +00:00
efficeon-agp.c agp: efficeon-agp: do not use PCI resources before pci_enable_device() 2010-08-05 12:28:21 +10:00
frontend.c agp: kill agp_flush_chipset and corresponding ioctl 2010-11-23 20:14:45 +00:00
generic.c agp: kill agp_rebind_memory 2010-11-23 20:14:46 +00:00
hp-agp.c
i460-agp.c Update broken web addresses in the kernel. 2010-10-18 11:03:14 +02:00
intel-agp.c agp: ensure GART has an address before enabling it 2011-02-04 09:43:57 +10:00
intel-agp.h agp/intel: Flush the chipset write buffers when changing GTT base 2011-01-11 20:35:41 +00:00
intel-gtt.c drm/i915,agp/intel: Do not clear stolen entries 2011-01-24 18:26:25 +00:00
isoch.c
Kconfig Revert "agp: AMD AGP is used on UP1100 & UP1500 alpha boxen" 2011-02-04 09:42:25 +10:00
Makefile agp/intel: make intel-gtt.c into a real source file 2010-09-08 21:20:06 +01:00
nvidia-agp.c
parisc-agp.c parisc-agp: fix missing slab.h include 2010-10-29 13:26:48 -04:00
sgi-agp.c
sis-agp.c
sworks-agp.c
uninorth-agp.c
via-agp.c