PCI: rcar: Add runtime PM support

If runtime PM is enabled in the kernel config, the PCI clocks are not
forced on at start-up, and thus, are never enabled.  Use
pm_runtime_get_sync() to enable the clocks.

While at it, use dev_info() instead of pr_info() since now we have the
device pointer available in the PCI setup callback.
Signed-off-by: Valentine Barshak <valentine.barshak@cogentembedded.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/pci/host/pci-rcar-gen2.c

@@ -17,6 +17,7 @@
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
 #include <linux/slab.h>
 
 /* AHB-PCI Bridge PCI communication registers */
@@ -77,6 +78,7 @@
 #define RCAR_PCI_NR_CONTROLLERS		3
 
 struct rcar_pci_priv {
+	struct device *dev;
 	void __iomem *reg;
 	struct resource io_res;
 	struct resource mem_res;
@@ -169,8 +171,11 @@ static int __init rcar_pci_setup(int nr, struct pci_sys_data *sys)
 	void __iomem *reg = priv->reg;
 	u32 val;
 
+	pm_runtime_enable(priv->dev);
+	pm_runtime_get_sync(priv->dev);
+
 	val = ioread32(reg + RCAR_PCI_UNIT_REV_REG);
-	pr_info("PCI: bus%u revision %x\n", sys->busnr, val);
+	dev_info(priv->dev, "PCI: bus%u revision %x\n", sys->busnr, val);
 
 	/* Disable Direct Power Down State and assert reset */
 	val = ioread32(reg + RCAR_USBCTR_REG) & ~RCAR_USBCTR_DIRPD;
@@ -301,6 +306,7 @@ static int __init rcar_pci_probe(struct platform_device *pdev)
 
 	priv->irq = platform_get_irq(pdev, 0);
 	priv->reg = reg;
+	priv->dev = &pdev->dev;
 
 	return rcar_pci_add_controller(priv);
 }