diff options
| author | Tim Gardner <tim.gardner@canonical.com> | 2010-07-09 14:48:50 -0600 |
|---|---|---|
| committer | Eric Anholt <eric@anholt.net> | 2010-07-26 11:27:07 -0700 |
| commit | e7b96f28c58ca09f15f6c2e8ccbb889a30fab4f7 (patch) | |
| tree | c18a4935e21c4d4f567489fed10899e2447a985c /drivers | |
| parent | 9c928d168d4030a230a7a5ee1764721d173f1153 (diff) | |
agp/intel: Use the correct mask to detect i830 aperture size.
BugLink: https://bugs.launchpad.net/bugs/597075
commit f1befe71fa7a79ab733011b045639d8d809924ad introduced a
regression when detecting aperture size of some i915 adapters, e.g.,
those on the Intel Q35 chipset.
The original report: https://bugzilla.kernel.org/show_bug.cgi?id=15733
The regression report: https://bugzilla.kernel.org/show_bug.cgi?id=16294
According to the specification found at
http://intellinuxgraphics.org/VOL_1_graphics_core.pdf, the PCI config
space register I830_GMCH_CTRL is a mirror of GMCH Graphics
Control. The correct macro for isolating the aperture size bits is
therefore I830_GMCH_GMS_MASK along with the attendant changes to the
case statement.
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Tested-by: Kees Cook <kees.cook@canonical.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Eric Anholt <eric@anholt.net>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/char/agp/intel-gtt.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/char/agp/intel-gtt.c b/drivers/char/agp/intel-gtt.c index 9344216183a..a7547150a70 100644 --- a/drivers/char/agp/intel-gtt.c +++ b/drivers/char/agp/intel-gtt.c @@ -1216,17 +1216,20 @@ static int intel_i915_get_gtt_size(void) /* G33's GTT size defined in gmch_ctrl */ pci_read_config_word(agp_bridge->dev, I830_GMCH_CTRL, &gmch_ctrl); - switch (gmch_ctrl & G33_PGETBL_SIZE_MASK) { - case G33_PGETBL_SIZE_1M: + switch (gmch_ctrl & I830_GMCH_GMS_MASK) { + case I830_GMCH_GMS_STOLEN_512: + size = 512; + break; + case I830_GMCH_GMS_STOLEN_1024: size = 1024; break; - case G33_PGETBL_SIZE_2M: - size = 2048; + case I830_GMCH_GMS_STOLEN_8192: + size = 8*1024; break; default: dev_info(&agp_bridge->dev->dev, "unknown page table size 0x%x, assuming 512KB\n", - (gmch_ctrl & G33_PGETBL_SIZE_MASK)); + (gmch_ctrl & I830_GMCH_GMS_MASK)); size = 512; } } else { |