PM: Allow PCI devices to suspend/resume asynchronously

Set power.async_suspend for all PCI devices and PCIe port services,
so that they can be suspended and resumed in parallel with other
devices they don't depend on in a known way (i.e. devices which are
not their parents or children).

This only affects the "regular" suspend and resume stages, which
means in particular that the restoration of the PCI devices' standard
configuration registers during resume will still be carried out
synchronously (at the "early" resume stage).

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

3 files changed, 3 insertions, 0 deletions

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index f4a2738bf0bf..2b9ac9e594af 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1540,6 +1540,7 @@ void pci_pm_init(struct pci_dev *dev)
         int pm;
         u16 pmc;
 
+        device_enable_async_suspend(&dev->dev);
         dev->wakeup_prepared = false;
         dev->pm_cap = 0;
 
diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c
index 0d34ff415399..e73effbe402c 100644
--- a/drivers/pci/pcie/portdrv_core.c
+++ b/drivers/pci/pcie/portdrv_core.c
@@ -285,6 +285,7 @@ static int pcie_device_init(struct pci_dev *pdev, int service, int irq)
                      pci_name(pdev),
                      get_descriptor_id(pdev->pcie_type, service));
         device->parent = &pdev->dev;
+        device_enable_async_suspend(device);
 
         retval = device_register(device);
         if (retval)
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 270d069819f7..2a943090a3b7 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1436,6 +1436,7 @@ struct pci_bus * pci_create_bus(struct device *parent,
         if (error)
                 goto dev_reg_err;
         b->bridge = get_device(dev);
+        device_enable_async_suspend(b->bridge);
 
         if (!parent)
                 set_dev_node(b->bridge, pcibus_to_node(b));