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.
diff --git a/drivers/char/agp/Kconfig b/drivers/char/agp/Kconfig
index c603bf2..a9f9c48 100644
--- a/drivers/char/agp/Kconfig
+++ b/drivers/char/agp/Kconfig
@@ -86,7 +86,7 @@
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_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 5ff457b..883a36a 100644
--- a/drivers/char/agp/generic.c
+++ b/drivers/char/agp/generic.c
@@ -419,6 +419,31 @@
*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) {