PCI/portdrv: Add runtime PM hooks for port service drivers

When PCIe port is runtime suspended/resumed some extra steps might be
needed to be executed from the port service driver side. For instance we
may need to disable PCIe hotplug interrupt to prevent it from triggering
immediately when PCIe link to the downstream component goes down.

To make the above possible add optional ->runtime_suspend() and
->runtime_resume() callbacks to struct pcie_port_service_driver and call
them for each port service in runtime suspend/resume callbacks of portdrv.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
[bhelgaas: adjust "slot->state" for 5790a9c78e78 ("PCI: pciehp: Unify
controller and slot structs")]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c
index 7c37d815229e..6542c48c7f59 100644
--- a/drivers/pci/pcie/portdrv_core.c
+++ b/drivers/pci/pcie/portdrv_core.c
@@ -395,6 +395,26 @@ int pcie_port_device_resume(struct device *dev)
 	size_t off = offsetof(struct pcie_port_service_driver, resume);
 	return device_for_each_child(dev, &off, pm_iter);
 }
+
+/**
+ * pcie_port_device_runtime_suspend - runtime suspend port services
+ * @dev: PCI Express port to handle
+ */
+int pcie_port_device_runtime_suspend(struct device *dev)
+{
+	size_t off = offsetof(struct pcie_port_service_driver, runtime_suspend);
+	return device_for_each_child(dev, &off, pm_iter);
+}
+
+/**
+ * pcie_port_device_runtime_resume - runtime resume port services
+ * @dev: PCI Express port to handle
+ */
+int pcie_port_device_runtime_resume(struct device *dev)
+{
+	size_t off = offsetof(struct pcie_port_service_driver, runtime_resume);
+	return device_for_each_child(dev, &off, pm_iter);
+}
 #endif /* PM */
 
 static int remove_iter(struct device *dev, void *data)