[PATCH] x86_64: Force broadcast timer on AMD systems with C3 too.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 15 insertions, 10 deletions

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index eb730a80952c..2be895895943 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -876,14 +876,11 @@ static int acpi_processor_power_verify(struct acpi_processor *pr)
 {
         unsigned int i;
         unsigned int working = 0;
-
-#ifdef ARCH_APICTIMER_STOPS_ON_C3
-        struct cpuinfo_x86 *c = cpu_data + pr->id;
+        int timer_broadcast = 0;
         cpumask_t mask = cpumask_of_cpu(pr->id);
 
-        if (c->x86_vendor == X86_VENDOR_INTEL) {
-                on_each_cpu(switch_ipi_to_APIC_timer, &mask, 1, 1);
-        }
+#ifdef ARCH_APICTIMER_STOPS_ON_C3
+        on_each_cpu(switch_ipi_to_APIC_timer, &mask, 1, 1);
 #endif
 
         for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
@@ -896,15 +893,20 @@ static int acpi_processor_power_verify(struct acpi_processor *pr)
 
                 case ACPI_STATE_C2:
                         acpi_processor_power_verify_c2(cx);
+#ifdef ARCH_APICTIMER_STOPS_ON_C3
+                        /* Some AMD systems fake C3 as C2, but still
+                           have timer troubles */
+                        if (cx->valid && 
+                                boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
+                                timer_broadcast++;
+#endif
                         break;
 
                 case ACPI_STATE_C3:
                         acpi_processor_power_verify_c3(pr, cx);
 #ifdef ARCH_APICTIMER_STOPS_ON_C3
-                        if (cx->valid && c->x86_vendor == X86_VENDOR_INTEL) {
-                                on_each_cpu(switch_APIC_timer_to_ipi,
-                                                &mask, 1, 1);
-                        }
+                        if (cx->valid)
+                                timer_broadcast++;
 #endif
                         break;
                 }
@@ -913,6 +915,9 @@ static int acpi_processor_power_verify(struct acpi_processor *pr)
                         working++;
         }
 
+        if (timer_broadcast)
+                on_each_cpu(switch_APIC_timer_to_ipi, &mask, 1, 1);
+
         return (working);
 }