usb: gadged: pch_udc: PCI core handles power state for us

There is no need to repeat the work that is already done in the PCI
driver core. The patch removes excerpts from suspend and resume
callbacks.

Note that there is no more calls performed to enable or disable a PCI
device during suspend-resume cycle. Nowadays they seems to be
superfluous. Someone can read more in [1].

While here, convert PM ops to use modern API.

[1] https://www.kernel.org/doc/ols/2009/ols2009-pages-319-330.pdf

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
[felipe.balbi@linux.intel.com: fixed build break and checkpatch error ]

Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

diff --git a/drivers/usb/gadget/udc/pch_udc.c b/drivers/usb/gadget/udc/pch_udc.c
index 9571ef54b86b53fcda4ba6517ed75e02f1751abb..58fc0adacd794a3dec248e7a4d83e7b927061fa4 100644 (file)
--- a/drivers/usb/gadget/udc/pch_udc.c
+++ b/drivers/usb/gadget/udc/pch_udc.c
@@ -3096,44 +3096,28 @@ static void pch_udc_remove(struct pci_dev *pdev)
        kfree(dev);
 }
 
-#ifdef CONFIG_PM
-static int pch_udc_suspend(struct pci_dev *pdev, pm_message_t state)
+#ifdef CONFIG_PM_SLEEP
+static int pch_udc_suspend(struct device *d)
 {
+       struct pci_dev *pdev = to_pci_dev(d);
        struct pch_udc_dev *dev = pci_get_drvdata(pdev);
 
        pch_udc_disable_interrupts(dev, UDC_DEVINT_MSK);
        pch_udc_disable_ep_interrupts(dev, UDC_EPINT_MSK_DISABLE_ALL);
 
-       pci_disable_device(pdev);
-       pci_enable_wake(pdev, PCI_D3hot, 0);
-
-       if (pci_save_state(pdev)) {
-               dev_err(&pdev->dev,
-                       "%s: could not save PCI config state\n", __func__);
-               return -ENOMEM;
-       }
-       pci_set_power_state(pdev, pci_choose_state(pdev, state));
        return 0;
 }
 
-static int pch_udc_resume(struct pci_dev *pdev)
+static int pch_udc_resume(struct device *d)
 {
-       int ret;
-
-       pci_set_power_state(pdev, PCI_D0);
-       pci_restore_state(pdev);
-       ret = pci_enable_device(pdev);
-       if (ret) {
-               dev_err(&pdev->dev, "%s: pci_enable_device failed\n", __func__);
-               return ret;
-       }
-       pci_enable_wake(pdev, PCI_D3hot, 0);
        return 0;
 }
+
+static SIMPLE_DEV_PM_OPS(pch_udc_pm, pch_udc_suspend, pch_udc_resume);
+#define PCH_UDC_PM_OPS         (&pch_udc_pm)
 #else
-#define pch_udc_suspend        NULL
-#define pch_udc_resume NULL
-#endif /* CONFIG_PM */
+#define PCH_UDC_PM_OPS         NULL
+#endif /* CONFIG_PM_SLEEP */
 
 static int pch_udc_probe(struct pci_dev *pdev,
                          const struct pci_device_id *id)
@@ -3262,9 +3246,10 @@ static struct pci_driver pch_udc_driver = {
        .id_table =     pch_udc_pcidev_id,
        .probe =        pch_udc_probe,
        .remove =       pch_udc_remove,
-       .suspend =      pch_udc_suspend,
-       .resume =       pch_udc_resume,
        .shutdown =     pch_udc_shutdown,
+       .driver = {
+               .pm = PCH_UDC_PM_OPS,
+       },
 };
 
 module_pci_driver(pch_udc_driver);