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agp/intel: Use the correct mask to detect i830 aperture size.

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BugLink: https://bugs.launchpad.net/bugs/597075

commit f1befe71fa 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>
This commit is contained in:
Tim Gardner 2010-07-09 14:48:50 -06:00 • committed by Eric Anholt
commit e7b96f28c5
1 changed files with 8 additions and 5 deletions
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13
drivers/char/agp/intel-gtt.c
View file

@ -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 {