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path: root/drivers/pci/pci-driver.c
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Diffstat (limited to 'drivers/pci/pci-driver.c')
-rw-r--r--drivers/pci/pci-driver.c118
1 files changed, 75 insertions, 43 deletions
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index b6a3a51801f0..a8124e47bf6e 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -526,7 +526,6 @@ static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
pci_power_up(pci_dev);
pci_restore_state(pci_dev);
pci_pme_restore(pci_dev);
- pci_fixup_device(pci_fixup_resume_early, pci_dev);
}
/*
@@ -681,6 +680,7 @@ static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
static int pci_pm_prepare(struct device *dev)
{
struct device_driver *drv = dev->driver;
+ struct pci_dev *pci_dev = to_pci_dev(dev);
if (drv && drv->pm && drv->pm->prepare) {
int error = drv->pm->prepare(dev);
@@ -690,7 +690,15 @@ static int pci_pm_prepare(struct device *dev)
if (!error && dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_PREPARE))
return 0;
}
- return pci_dev_keep_suspended(to_pci_dev(dev));
+ if (pci_dev_need_resume(pci_dev))
+ return 0;
+
+ /*
+ * The PME setting needs to be adjusted here in case the direct-complete
+ * optimization is used with respect to this device.
+ */
+ pci_dev_adjust_pme(pci_dev);
+ return 1;
}
static void pci_pm_complete(struct device *dev)
@@ -704,7 +712,14 @@ static void pci_pm_complete(struct device *dev)
if (pm_runtime_suspended(dev) && pm_resume_via_firmware()) {
pci_power_t pre_sleep_state = pci_dev->current_state;
- pci_update_current_state(pci_dev, pci_dev->current_state);
+ pci_refresh_power_state(pci_dev);
+ /*
+ * On platforms with ACPI this check may also trigger for
+ * devices sharing power resources if one of those power
+ * resources has been activated as a result of a change of the
+ * power state of another device sharing it. However, in that
+ * case it is also better to resume the device, in general.
+ */
if (pci_dev->current_state < pre_sleep_state)
pm_request_resume(dev);
}
@@ -736,6 +751,8 @@ static int pci_pm_suspend(struct device *dev)
struct pci_dev *pci_dev = to_pci_dev(dev);
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
+ pci_dev->skip_bus_pm = false;
+
if (pci_has_legacy_pm_support(pci_dev))
return pci_legacy_suspend(dev, PMSG_SUSPEND);
@@ -758,9 +775,11 @@ static int pci_pm_suspend(struct device *dev)
* better to resume the device from runtime suspend here.
*/
if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
- !pci_dev_keep_suspended(pci_dev)) {
+ pci_dev_need_resume(pci_dev)) {
pm_runtime_resume(dev);
pci_dev->state_saved = false;
+ } else {
+ pci_dev_adjust_pme(pci_dev);
}
if (pm->suspend) {
@@ -829,7 +848,18 @@ static int pci_pm_suspend_noirq(struct device *dev)
}
}
- if (!pci_dev->state_saved) {
+ if (pci_dev->skip_bus_pm) {
+ /*
+ * Either the device is a bridge with a child in D0 below it, or
+ * the function is running for the second time in a row without
+ * going through full resume, which is possible only during
+ * suspend-to-idle in a spurious wakeup case. The device should
+ * be in D0 at this point, but if it is a bridge, it may be
+ * necessary to save its state.
+ */
+ if (!pci_dev->state_saved)
+ pci_save_state(pci_dev);
+ } else if (!pci_dev->state_saved) {
pci_save_state(pci_dev);
if (pci_power_manageable(pci_dev))
pci_prepare_to_sleep(pci_dev);
@@ -838,6 +868,22 @@ static int pci_pm_suspend_noirq(struct device *dev)
dev_dbg(dev, "PCI PM: Suspend power state: %s\n",
pci_power_name(pci_dev->current_state));
+ if (pci_dev->current_state == PCI_D0) {
+ pci_dev->skip_bus_pm = true;
+ /*
+ * Per PCI PM r1.2, table 6-1, a bridge must be in D0 if any
+ * downstream device is in D0, so avoid changing the power state
+ * of the parent bridge by setting the skip_bus_pm flag for it.
+ */
+ if (pci_dev->bus->self)
+ pci_dev->bus->self->skip_bus_pm = true;
+ }
+
+ if (pci_dev->skip_bus_pm && pm_suspend_no_platform()) {
+ dev_dbg(dev, "PCI PM: Skipped\n");
+ goto Fixup;
+ }
+
pci_pm_set_unknown_state(pci_dev);
/*
@@ -885,7 +931,16 @@ static int pci_pm_resume_noirq(struct device *dev)
if (dev_pm_smart_suspend_and_suspended(dev))
pm_runtime_set_active(dev);
- pci_pm_default_resume_early(pci_dev);
+ /*
+ * In the suspend-to-idle case, devices left in D0 during suspend will
+ * stay in D0, so it is not necessary to restore or update their
+ * configuration here and attempting to put them into D0 again is
+ * pointless, so avoid doing that.
+ */
+ if (!(pci_dev->skip_bus_pm && pm_suspend_no_platform()))
+ pci_pm_default_resume_early(pci_dev);
+
+ pci_fixup_device(pci_fixup_resume_early, pci_dev);
if (pci_has_legacy_pm_support(pci_dev))
return pci_legacy_resume_early(dev);
@@ -959,15 +1014,15 @@ static int pci_pm_freeze(struct device *dev)
}
/*
- * This used to be done in pci_pm_prepare() for all devices and some
- * drivers may depend on it, so do it here. Ideally, runtime-suspended
- * devices should not be touched during freeze/thaw transitions,
- * however.
+ * Resume all runtime-suspended devices before creating a snapshot
+ * image of system memory, because the restore kernel generally cannot
+ * be expected to always handle them consistently and they need to be
+ * put into the runtime-active metastate during system resume anyway,
+ * so it is better to ensure that the state saved in the image will be
+ * always consistent with that.
*/
- if (!dev_pm_smart_suspend_and_suspended(dev)) {
- pm_runtime_resume(dev);
- pci_dev->state_saved = false;
- }
+ pm_runtime_resume(dev);
+ pci_dev->state_saved = false;
if (pm->freeze) {
int error;
@@ -981,22 +1036,11 @@ static int pci_pm_freeze(struct device *dev)
return 0;
}
-static int pci_pm_freeze_late(struct device *dev)
-{
- if (dev_pm_smart_suspend_and_suspended(dev))
- return 0;
-
- return pm_generic_freeze_late(dev);
-}
-
static int pci_pm_freeze_noirq(struct device *dev)
{
struct pci_dev *pci_dev = to_pci_dev(dev);
struct device_driver *drv = dev->driver;
- if (dev_pm_smart_suspend_and_suspended(dev))
- return 0;
-
if (pci_has_legacy_pm_support(pci_dev))
return pci_legacy_suspend_late(dev, PMSG_FREEZE);
@@ -1026,16 +1070,6 @@ static int pci_pm_thaw_noirq(struct device *dev)
struct device_driver *drv = dev->driver;
int error = 0;
- /*
- * If the device is in runtime suspend, the code below may not work
- * correctly with it, so skip that code and make the PM core skip all of
- * the subsequent "thaw" callbacks for the device.
- */
- if (dev_pm_smart_suspend_and_suspended(dev)) {
- dev_pm_skip_next_resume_phases(dev);
- return 0;
- }
-
if (pcibios_pm_ops.thaw_noirq) {
error = pcibios_pm_ops.thaw_noirq(dev);
if (error)
@@ -1095,10 +1129,13 @@ static int pci_pm_poweroff(struct device *dev)
/* The reason to do that is the same as in pci_pm_suspend(). */
if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
- !pci_dev_keep_suspended(pci_dev))
+ pci_dev_need_resume(pci_dev)) {
pm_runtime_resume(dev);
+ pci_dev->state_saved = false;
+ } else {
+ pci_dev_adjust_pme(pci_dev);
+ }
- pci_dev->state_saved = false;
if (pm->poweroff) {
int error;
@@ -1170,10 +1207,6 @@ static int pci_pm_restore_noirq(struct device *dev)
struct device_driver *drv = dev->driver;
int error = 0;
- /* This is analogous to the pci_pm_resume_noirq() case. */
- if (dev_pm_smart_suspend_and_suspended(dev))
- pm_runtime_set_active(dev);
-
if (pcibios_pm_ops.restore_noirq) {
error = pcibios_pm_ops.restore_noirq(dev);
if (error)
@@ -1181,6 +1214,7 @@ static int pci_pm_restore_noirq(struct device *dev)
}
pci_pm_default_resume_early(pci_dev);
+ pci_fixup_device(pci_fixup_resume_early, pci_dev);
if (pci_has_legacy_pm_support(pci_dev))
return pci_legacy_resume_early(dev);
@@ -1222,7 +1256,6 @@ static int pci_pm_restore(struct device *dev)
#else /* !CONFIG_HIBERNATE_CALLBACKS */
#define pci_pm_freeze NULL
-#define pci_pm_freeze_late NULL
#define pci_pm_freeze_noirq NULL
#define pci_pm_thaw NULL
#define pci_pm_thaw_noirq NULL
@@ -1348,7 +1381,6 @@ static const struct dev_pm_ops pci_dev_pm_ops = {
.suspend_late = pci_pm_suspend_late,
.resume = pci_pm_resume,
.freeze = pci_pm_freeze,
- .freeze_late = pci_pm_freeze_late,
.thaw = pci_pm_thaw,
.poweroff = pci_pm_poweroff,
.poweroff_late = pci_pm_poweroff_late,