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path: root/drivers/acpi/processor_idle.c
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Diffstat (limited to 'drivers/acpi/processor_idle.c')
-rw-r--r--drivers/acpi/processor_idle.c75
1 files changed, 34 insertions, 41 deletions
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index bbd066e7f85..7c0441f63b3 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -164,7 +164,7 @@ static void lapic_timer_check_state(int state, struct acpi_processor *pr,
pr->power.timer_broadcast_on_state = state;
}
-static void lapic_timer_propagate_broadcast(void *arg)
+static void __lapic_timer_propagate_broadcast(void *arg)
{
struct acpi_processor *pr = (struct acpi_processor *) arg;
unsigned long reason;
@@ -175,6 +175,12 @@ static void lapic_timer_propagate_broadcast(void *arg)
clockevents_notify(reason, &pr->id);
}
+static void lapic_timer_propagate_broadcast(struct acpi_processor *pr)
+{
+ smp_call_function_single(pr->id, __lapic_timer_propagate_broadcast,
+ (void *)pr, 1);
+}
+
/* Power(C) State timer broadcast control */
static void lapic_timer_state_broadcast(struct acpi_processor *pr,
struct acpi_processor_cx *cx,
@@ -299,6 +305,28 @@ static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr)
pr->power.states[ACPI_STATE_C2].latency = acpi_gbl_FADT.C2latency;
pr->power.states[ACPI_STATE_C3].latency = acpi_gbl_FADT.C3latency;
+ /*
+ * FADT specified C2 latency must be less than or equal to
+ * 100 microseconds.
+ */
+ if (acpi_gbl_FADT.C2latency > ACPI_PROCESSOR_MAX_C2_LATENCY) {
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "C2 latency too large [%d]\n", acpi_gbl_FADT.C2latency));
+ /* invalidate C2 */
+ pr->power.states[ACPI_STATE_C2].address = 0;
+ }
+
+ /*
+ * FADT supplied C3 latency must be less than or equal to
+ * 1000 microseconds.
+ */
+ if (acpi_gbl_FADT.C3latency > ACPI_PROCESSOR_MAX_C3_LATENCY) {
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "C3 latency too large [%d]\n", acpi_gbl_FADT.C3latency));
+ /* invalidate C3 */
+ pr->power.states[ACPI_STATE_C3].address = 0;
+ }
+
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"lvl2[0x%08x] lvl3[0x%08x]\n",
pr->power.states[ACPI_STATE_C2].address,
@@ -488,33 +516,6 @@ static int acpi_processor_get_power_info_cst(struct acpi_processor *pr)
return status;
}
-static void acpi_processor_power_verify_c2(struct acpi_processor_cx *cx)
-{
-
- if (!cx->address)
- return;
-
- /*
- * C2 latency must be less than or equal to 100
- * microseconds.
- */
- else if (cx->latency > ACPI_PROCESSOR_MAX_C2_LATENCY) {
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "latency too large [%d]\n", cx->latency));
- return;
- }
-
- /*
- * Otherwise we've met all of our C2 requirements.
- * Normalize the C2 latency to expidite policy
- */
- cx->valid = 1;
-
- cx->latency_ticks = cx->latency;
-
- return;
-}
-
static void acpi_processor_power_verify_c3(struct acpi_processor *pr,
struct acpi_processor_cx *cx)
{
@@ -526,16 +527,6 @@ static void acpi_processor_power_verify_c3(struct acpi_processor *pr,
return;
/*
- * C3 latency must be less than or equal to 1000
- * microseconds.
- */
- else if (cx->latency > ACPI_PROCESSOR_MAX_C3_LATENCY) {
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "latency too large [%d]\n", cx->latency));
- return;
- }
-
- /*
* PIIX4 Erratum #18: We don't support C3 when Type-F (fast)
* DMA transfers are used by any ISA device to avoid livelock.
* Note that we could disable Type-F DMA (as recommended by
@@ -623,7 +614,10 @@ static int acpi_processor_power_verify(struct acpi_processor *pr)
break;
case ACPI_STATE_C2:
- acpi_processor_power_verify_c2(cx);
+ if (!cx->address)
+ break;
+ cx->valid = 1;
+ cx->latency_ticks = cx->latency; /* Normalize latency */
break;
case ACPI_STATE_C3:
@@ -638,8 +632,7 @@ static int acpi_processor_power_verify(struct acpi_processor *pr)
working++;
}
- smp_call_function_single(pr->id, lapic_timer_propagate_broadcast,
- pr, 1);
+ lapic_timer_propagate_broadcast(pr);
return (working);
}