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| author | Linus Torvalds <torvalds@woody.osdl.org> | 2006-12-13 03:53:04 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-12-13 03:53:04 +0100 |
| commit | 3641b536ecc56f68fe182ac99f7ddc4827125118 (patch) | |
| tree | 8bb025f9e981588c09aeb13b1a7c117036c4e703 /drivers/char | |
| parent | Merge branch 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/rolan... (diff) | |
| parent | Merge ../linus (diff) | |
| download | linux-3641b536ecc56f68fe182ac99f7ddc4827125118.tar.xz linux-3641b536ecc56f68fe182ac99f7ddc4827125118.zip | |
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/Kconfig | 4 | ||||
| -rw-r--r-- | drivers/char/agp/generic.c | 25 |
2 files changed, 27 insertions, 2 deletions
diff --git a/drivers/char/agp/Kconfig b/drivers/char/agp/Kconfig index c603bf291580..a9f9c48c2424 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 5ff457b41efb..883a36a27833 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) { |