mei: txe: use runtime PG pm domain for non wakeable devices

For non wakeable devices we can't use pci runtime framework
as we are not able to wakeup from D3 states.
Instead we create new pg runtime domain that only drives TXE power
gating protocol to reduce the power consumption.

Signed-off-by: Alexander Usyskin <[e-mail]>
Signed-off-by: Tomas Winkler <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/misc/mei/pci-txe.c

···
 };
 MODULE_DEVICE_TABLE(pci, mei_txe_pci_tbl);
 
+#ifdef CONFIG_PM_RUNTIME
+static inline void mei_txe_set_pm_domain(struct mei_device *dev);
+static inline void mei_txe_unset_pm_domain(struct mei_device *dev);
+#else
+static inline void mei_txe_set_pm_domain(struct mei_device *dev) {}
+static inline void mei_txe_unset_pm_domain(struct mei_device *dev) {}
+#endif /* CONFIG_PM_RUNTIME */
 
 static void mei_txe_pci_iounmap(struct pci_dev *pdev, struct mei_txe_hw *hw)
 {
···
 
 	pci_set_drvdata(pdev, dev);
 
+	/*
+	* For not wake-able HW runtime pm framework
+	* can't be used on pci device level.
+	* Use domain runtime pm callbacks instead.
+	*/
+	if (!pci_dev_run_wake(pdev))
+		mei_txe_set_pm_domain(dev);
+
 	pm_runtime_put_noidle(&pdev->dev);
 
 	return 0;
···
 	hw = to_txe_hw(dev);
 
 	mei_stop(dev);
+
+	if (!pci_dev_run_wake(pdev))
+		mei_txe_unset_pm_domain(dev);
 
 	/* disable interrupts */
 	mei_disable_interrupts(dev);
···
 	dev_dbg(&pdev->dev, "rpm: txe: runtime resume ret = %d\n", ret);
 
 	return ret;
+}
+
+/**
+ * mei_txe_set_pm_domain - fill and set pm domian stucture for device
+ *
+ * @dev: mei_device
+ */
+static inline void mei_txe_set_pm_domain(struct mei_device *dev)
+{
+	struct pci_dev *pdev  = dev->pdev;
+
+	if (pdev->dev.bus && pdev->dev.bus->pm) {
+		dev->pg_domain.ops = *pdev->dev.bus->pm;
+
+		dev->pg_domain.ops.runtime_suspend = mei_txe_pm_runtime_suspend;
+		dev->pg_domain.ops.runtime_resume = mei_txe_pm_runtime_resume;
+		dev->pg_domain.ops.runtime_idle = mei_txe_pm_runtime_idle;
+
+		pdev->dev.pm_domain = &dev->pg_domain;
+	}
+}
+
+/**
+ * mei_txe_unset_pm_domain - clean pm domian stucture for device
+ *
+ * @dev: mei_device
+ */
+static inline void mei_txe_unset_pm_domain(struct mei_device *dev)
+{
+	/* stop using pm callbacks if any */
+	dev->pdev->dev.pm_domain = NULL;
 }
 #endif /* CONFIG_PM_RUNTIME */