[PATCH] x86-64: i386/x86-64: Fix time going twice as fast problem on ATI Xpress chipsets
Original patch from Bertro Simul
This is probably still not quite correct, but seems to be
the best solution so far.
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/arch/x86_64/kernel/io_apic.c b/arch/x86_64/kernel/io_apic.c
index 961b519..522944a 100644
--- a/arch/x86_64/kernel/io_apic.c
+++ b/arch/x86_64/kernel/io_apic.c
@@ -44,6 +44,8 @@
static int no_timer_check;
+int disable_timer_pin_1 __initdata;
+
static DEFINE_SPINLOCK(ioapic_lock);
/*
@@ -297,6 +299,15 @@
#endif
/* RED-PEN skip them on mptables too? */
return;
+ case PCI_VENDOR_ID_ATI:
+ /* All timer interrupts on atiixp
+ are doubled. Disable one. */
+ if (disable_timer_pin_1 == 0) {
+ disable_timer_pin_1 = 1;
+ printk(KERN_INFO
+ "ATI board detected. Disabling timer pin 1.\n");
+ }
+ return;
}
/* No multi-function device? */
@@ -1658,6 +1669,8 @@
setup_nmi();
enable_8259A_irq(0);
}
+ if (disable_timer_pin_1 > 0)
+ clear_IO_APIC_pin(0, pin1);
return;
}
clear_IO_APIC_pin(0, pin1);
diff --git a/arch/x86_64/kernel/setup.c b/arch/x86_64/kernel/setup.c
index 869770d..351d8d6 100644
--- a/arch/x86_64/kernel/setup.c
+++ b/arch/x86_64/kernel/setup.c
@@ -336,6 +336,11 @@
#endif
#endif
+ if (!memcmp(from, "disable_timer_pin_1", 19))
+ disable_timer_pin_1 = 1;
+ if (!memcmp(from, "enable_timer_pin_1", 18))
+ disable_timer_pin_1 = -1;
+
if (!memcmp(from, "nolapic", 7) ||
!memcmp(from, "disableapic", 11))
disable_apic = 1;
