usb: dwc3: pci: add basic suspend/resume support

this patch adds basic PM support for the
PCI glue layer.

Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/dwc3/dwc3-pci.c b/drivers/usb/dwc3/dwc3-pci.c
index e8d77689a322d941042643a980e423545f7bc365..227d4a7acad7595d4774e9fc335a790c742087be 100644 (file)
--- a/drivers/usb/dwc3/dwc3-pci.c
+++ b/drivers/usb/dwc3/dwc3-pci.c
@@ -212,11 +212,49 @@ static DEFINE_PCI_DEVICE_TABLE(dwc3_pci_id_table) = {
 };
 MODULE_DEVICE_TABLE(pci, dwc3_pci_id_table);
 
+#ifdef CONFIG_PM
+static int dwc3_pci_suspend(struct device *dev)
+{
+       struct pci_dev  *pci = to_pci_dev(dev);
+
+       pci_disable_device(pci);
+
+       return 0;
+}
+
+static int dwc3_pci_resume(struct device *dev)
+{
+       struct pci_dev  *pci = to_pci_dev(dev);
+       int             ret;
+
+       ret = pci_enable_device(pci);
+       if (ret) {
+               dev_err(dev, "can't re-enable device --> %d\n", ret);
+               return ret;
+       }
+
+       pci_set_master(pci);
+
+       return 0;
+}
+
+static const struct dev_pm_ops dwc3_pci_dev_pm_ops = {
+       SET_SYSTEM_SLEEP_PM_OPS(dwc3_pci_suspend, dwc3_pci_resume)
+};
+
+#define DEV_PM_OPS     (&dwc3_pci_dev_pm_ops)
+#else
+#define DEV_PM_OPS     NULL
+#endif /* CONFIG_PM */
+
 static struct pci_driver dwc3_pci_driver = {
        .name           = "dwc3-pci",
        .id_table       = dwc3_pci_id_table,
        .probe          = dwc3_pci_probe,
        .remove         = dwc3_pci_remove,
+       .driver         = {
+               .pm     = DEV_PM_OPS,
+       },
 };
 
 MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");