PCI: dra7xx: Add PM support

Add PM support to pci-dra7xx so PCI clocks can be disabled during suspend
and enabled during resume without affecting PCI functionality.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Jingoo Han <jingoohan1@gmail.com>

diff --git a/drivers/pci/host/pci-dra7xx.c b/drivers/pci/host/pci-dra7xx.c
index d8b6d66b95b75013c803c1f2e1f38b9a46466a43..08b999a4c7f8d27fcf38e5808663a0ed0fa9a68b 100644 (file)
--- a/drivers/pci/host/pci-dra7xx.c
+++ b/drivers/pci/host/pci-dra7xx.c
@@ -433,6 +433,56 @@ static int __exit dra7xx_pcie_remove(struct platform_device *pdev)
        return 0;
 }
 
+#ifdef CONFIG_PM_SLEEP
+static int dra7xx_pcie_suspend_noirq(struct device *dev)
+{
+       struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
+       int count = dra7xx->phy_count;
+
+       while (count--) {
+               phy_power_off(dra7xx->phy[count]);
+               phy_exit(dra7xx->phy[count]);
+       }
+
+       return 0;
+}
+
+static int dra7xx_pcie_resume_noirq(struct device *dev)
+{
+       struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
+       int phy_count = dra7xx->phy_count;
+       int ret;
+       int i;
+
+       for (i = 0; i < phy_count; i++) {
+               ret = phy_init(dra7xx->phy[i]);
+               if (ret < 0)
+                       goto err_phy;
+
+               ret = phy_power_on(dra7xx->phy[i]);
+               if (ret < 0) {
+                       phy_exit(dra7xx->phy[i]);
+                       goto err_phy;
+               }
+       }
+
+       return 0;
+
+err_phy:
+       while (--i >= 0) {
+               phy_power_off(dra7xx->phy[i]);
+               phy_exit(dra7xx->phy[i]);
+       }
+
+       return ret;
+}
+#endif
+
+static const struct dev_pm_ops dra7xx_pcie_pm_ops = {
+       SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(dra7xx_pcie_suspend_noirq,
+                                     dra7xx_pcie_resume_noirq)
+};
+
 static const struct of_device_id of_dra7xx_pcie_match[] = {
        { .compatible = "ti,dra7-pcie", },
        {},
@@ -444,6 +494,7 @@ static struct platform_driver dra7xx_pcie_driver = {
        .driver = {
                .name   = "dra7-pcie",
                .of_match_table = of_dra7xx_pcie_match,
+               .pm     = &dra7xx_pcie_pm_ops,
        },
 };