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>

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/pci/host/pci-rcar-gen2.c b/drivers/pci/host/pci-rcar-gen2.c
index 96d118242ae2..ceec147baec3 100644
--- a/drivers/pci/host/pci-rcar-gen2.c
+++ b/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);
 }