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>

1 files changed, 38 insertions, 0 deletions

diff --git a/drivers/usb/dwc3/dwc3-pci.c b/drivers/usb/dwc3/dwc3-pci.c
index e8d77689a322..227d4a7acad7 100644
--- 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>");