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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2012-10-24 02:08:38 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2012-10-24 02:08:38 +0200
commit8b713a88cc8b746f975958183fa641e9f1c8086d (patch)
tree0ba531d81f66c5f79a045d4843664324a8bead12 /drivers
parent34b1f76275a2cb8c1ce8e00095d200552b235122 (diff)
PM / ACPI: Take device PM QoS flags into account
Make ACPI power management routines and PCI power management routines depending on ACPI take device PM QoS flags into account when deciding what power state to put the device into. In particular, after this change acpi_pm_device_sleep_state() will not return ACPI_STATE_D3_COLD as the deepest available low-power state if PM_QOS_FLAG_NO_POWER_OFF is requested for the device and it will not require remote wakeup to work for the device in the returned low-power state if there is at least one PM QoS flags request for the device, but PM_QOS_FLAG_REMOTE_WAKEUP is not requested for it. Accordingly, acpi_pci_set_power_state() will refuse to put the device into D3cold if PM_QOS_FLAG_NO_POWER_OFF is requested for it. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Jean Pihet <j-pihet@ti.com> Reviewed-by: Huang Ying <ying.huang@intel.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/acpi/sleep.c21
-rw-r--r--drivers/pci/pci-acpi.c8
2 files changed, 24 insertions, 5 deletions
diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index fdcdbb65291..69134653909 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -19,6 +19,7 @@
#include <linux/acpi.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
+#include <linux/pm_qos.h>
#include <asm/io.h>
@@ -711,6 +712,7 @@ int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in)
struct acpi_device *adev;
char acpi_method[] = "_SxD";
unsigned long long d_min, d_max;
+ bool wakeup = false;
if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3)
return -EINVAL;
@@ -718,6 +720,13 @@ int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in)
printk(KERN_DEBUG "ACPI handle has no context!\n");
return -ENODEV;
}
+ if (d_max_in > ACPI_STATE_D3_HOT) {
+ enum pm_qos_flags_status stat;
+
+ stat = dev_pm_qos_flags(dev, PM_QOS_FLAG_NO_POWER_OFF);
+ if (stat == PM_QOS_FLAGS_ALL)
+ d_max_in = ACPI_STATE_D3_HOT;
+ }
acpi_method[2] = '0' + acpi_target_sleep_state;
/*
@@ -737,8 +746,14 @@ int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in)
* NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
* provided -- that's our fault recovery, we ignore retval.
*/
- if (acpi_target_sleep_state > ACPI_STATE_S0)
+ if (acpi_target_sleep_state > ACPI_STATE_S0) {
acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
+ wakeup = device_may_wakeup(dev) && adev->wakeup.flags.valid
+ && adev->wakeup.sleep_state >= acpi_target_sleep_state;
+ } else if (dev_pm_qos_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP) !=
+ PM_QOS_FLAGS_NONE) {
+ wakeup = adev->wakeup.flags.valid;
+ }
/*
* If _PRW says we can wake up the system from the target sleep state,
@@ -747,9 +762,7 @@ int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in)
* (ACPI 3.x), it should return the maximum (lowest power) D-state that
* can wake the system. _S0W may be valid, too.
*/
- if (acpi_target_sleep_state == ACPI_STATE_S0 ||
- (device_may_wakeup(dev) && adev->wakeup.flags.valid &&
- adev->wakeup.sleep_state >= acpi_target_sleep_state)) {
+ if (wakeup) {
acpi_status status;
acpi_method[3] = 'W';
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index c5792d622dc..63d6618a480 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -17,6 +17,7 @@
#include <linux/pci-acpi.h>
#include <linux/pm_runtime.h>
+#include <linux/pm_qos.h>
#include "pci.h"
static DEFINE_MUTEX(pci_acpi_pm_notify_mtx);
@@ -257,11 +258,16 @@ static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
return -ENODEV;
switch (state) {
+ case PCI_D3cold:
+ if (dev_pm_qos_flags(&dev->dev, PM_QOS_FLAG_NO_POWER_OFF) ==
+ PM_QOS_FLAGS_ALL) {
+ error = -EBUSY;
+ break;
+ }
case PCI_D0:
case PCI_D1:
case PCI_D2:
case PCI_D3hot:
- case PCI_D3cold:
error = acpi_bus_set_power(handle, state_conv[state]);
}