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authorLinus Torvalds <torvalds@woody.osdl.org>2006-12-12 18:53:04 -0800
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-12 18:53:04 -0800
commit3641b536ecc56f68fe182ac99f7ddc4827125118 (patch)
tree8bb025f9e981588c09aeb13b1a7c117036c4e703 /drivers/char
parentb1ef951e8199d1c59f14dbe0fa22974ed57a3b48 (diff)
parentf0eef25339f92f7cd4aeea23d9ae97987a5a1e82 (diff)
Merge master.kernel.org:/pub/scm/linux/kernel/git/davej/agpgart
* master.kernel.org:/pub/scm/linux/kernel/git/davej/agpgart: [AGPGART] VIA and SiS AGP chipsets are x86-only [AGPGART] agp-amd64: section mismatches with HOTPLUG=n [AGPGART] Fix up misprogrammed bridges with incorrect AGPv2 rates.
Diffstat (limited to 'drivers/char')
-rw-r--r--drivers/char/agp/Kconfig4
-rw-r--r--drivers/char/agp/generic.c25
2 files changed, 27 insertions, 2 deletions
diff --git a/drivers/char/agp/Kconfig b/drivers/char/agp/Kconfig
index c603bf29158..a9f9c48c242 100644
--- a/drivers/char/agp/Kconfig
+++ b/drivers/char/agp/Kconfig
@@ -86,7 +86,7 @@ config AGP_NVIDIA
config AGP_SIS
tristate "SiS chipset support"
- depends on AGP
+ depends on AGP && X86
help
This option gives you AGP support for the GLX component of
X on Silicon Integrated Systems [SiS] chipsets.
@@ -103,7 +103,7 @@ config AGP_SWORKS
config AGP_VIA
tristate "VIA chipset support"
- depends on AGP
+ depends on AGP && X86
help
This option gives you AGP support for the GLX component of
X on VIA MVP3/Apollo Pro chipsets.
diff --git a/drivers/char/agp/generic.c b/drivers/char/agp/generic.c
index 5ff457b41ef..883a36a2783 100644
--- a/drivers/char/agp/generic.c
+++ b/drivers/char/agp/generic.c
@@ -419,6 +419,31 @@ static void agp_v2_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_
*requested_mode &= ~AGP2_RESERVED_MASK;
}
+ /*
+ * Some dumb bridges are programmed to disobey the AGP2 spec.
+ * This is likely a BIOS misprogramming rather than poweron default, or
+ * it would be a lot more common.
+ * https://bugs.freedesktop.org/show_bug.cgi?id=8816
+ * AGPv2 spec 6.1.9 states:
+ * The RATE field indicates the data transfer rates supported by this
+ * device. A.G.P. devices must report all that apply.
+ * Fix them up as best we can.
+ */
+ switch (*bridge_agpstat & 7) {
+ case 4:
+ *bridge_agpstat |= (AGPSTAT2_2X | AGPSTAT2_1X);
+ printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x4 rate"
+ "Fixing up support for x2 & x1\n");
+ break;
+ case 2:
+ *bridge_agpstat |= AGPSTAT2_1X;
+ printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x2 rate"
+ "Fixing up support for x1\n");
+ break;
+ default:
+ break;
+ }
+
/* Check the speed bits make sense. Only one should be set. */
tmp = *requested_mode & 7;
switch (tmp) {