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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.c50
1 files changed, 40 insertions, 10 deletions
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index f7ca8c55956b..10a2d913635a 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -148,6 +148,9 @@ static void acpi_timer_check_state(int state, struct acpi_processor *pr,
if (cpu_has(&cpu_data(pr->id), X86_FEATURE_ARAT))
return;
+ if (boot_cpu_has(X86_FEATURE_AMDC1E))
+ type = ACPI_STATE_C1;
+
/*
* Check, if one of the previous states already marked the lapic
* unstable
@@ -202,21 +205,44 @@ static void acpi_state_timer_broadcast(struct acpi_processor *pr,
* Suspend / resume control
*/
static int acpi_idle_suspend;
+static u32 saved_bm_rld;
+
+static void acpi_idle_bm_rld_save(void)
+{
+ acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld);
+}
+static void acpi_idle_bm_rld_restore(void)
+{
+ u32 resumed_bm_rld;
+
+ acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld);
+
+ if (resumed_bm_rld != saved_bm_rld)
+ acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld);
+}
int acpi_processor_suspend(struct acpi_device * device, pm_message_t state)
{
+ if (acpi_idle_suspend == 1)
+ return 0;
+
+ acpi_idle_bm_rld_save();
acpi_idle_suspend = 1;
return 0;
}
int acpi_processor_resume(struct acpi_device * device)
{
+ if (acpi_idle_suspend == 0)
+ return 0;
+
+ acpi_idle_bm_rld_restore();
acpi_idle_suspend = 0;
return 0;
}
#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86)
-static int tsc_halts_in_c(int state)
+static void tsc_check_state(int state)
{
switch (boot_cpu_data.x86_vendor) {
case X86_VENDOR_AMD:
@@ -226,13 +252,17 @@ static int tsc_halts_in_c(int state)
* C/P/S0/S1 states when this bit is set.
*/
if (boot_cpu_has(X86_FEATURE_NONSTOP_TSC))
- return 0;
+ return;
/*FALL THROUGH*/
default:
- return state > ACPI_STATE_C1;
+ /* TSC could halt in idle, so notify users */
+ if (state > ACPI_STATE_C1)
+ mark_tsc_unstable("TSC halts in idle");
}
}
+#else
+static void tsc_check_state(int state) { return; }
#endif
static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr)
@@ -578,17 +608,13 @@ static int acpi_processor_power_verify(struct acpi_processor *pr)
pr->power.timer_broadcast_on_state = INT_MAX;
- for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
+ for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) {
struct acpi_processor_cx *cx = &pr->power.states[i];
-#if defined (CONFIG_GENERIC_TIME) && defined (CONFIG_X86)
- /* TSC could halt in idle, so notify users */
- if (tsc_halts_in_c(cx->type))
- mark_tsc_unstable("TSC halts in idle");;
-#endif
switch (cx->type) {
case ACPI_STATE_C1:
cx->valid = 1;
+ acpi_timer_check_state(i, pr, cx);
break;
case ACPI_STATE_C2:
@@ -603,6 +629,8 @@ static int acpi_processor_power_verify(struct acpi_processor *pr)
acpi_timer_check_state(i, pr, cx);
break;
}
+ if (cx->valid)
+ tsc_check_state(cx->type);
if (cx->valid)
working++;
@@ -806,11 +834,12 @@ static int acpi_idle_enter_c1(struct cpuidle_device *dev,
/* Do not access any ACPI IO ports in suspend path */
if (acpi_idle_suspend) {
- acpi_safe_halt();
local_irq_enable();
+ cpu_relax();
return 0;
}
+ acpi_state_timer_broadcast(pr, cx, 1);
kt1 = ktime_get_real();
acpi_idle_do_entry(cx);
kt2 = ktime_get_real();
@@ -818,6 +847,7 @@ static int acpi_idle_enter_c1(struct cpuidle_device *dev,
local_irq_enable();
cx->usage++;
+ acpi_state_timer_broadcast(pr, cx, 0);
return idle_time;
}
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