usb: dwc2: add shutdown callback to platform variant

[cascardo/linux.git] / drivers / usb / dwc2 / platform.c

diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c
index 1e7cb99..510f787 100644 (file)
--- a/drivers/usb/dwc2/platform.c
+++ b/drivers/usb/dwc2/platform.c
@@ -405,6 +405,25 @@ static int dwc2_driver_remove(struct platform_device *dev)
        return 0;
 }
 
+/**
+ * dwc2_driver_shutdown() - Called on device shutdown
+ *
+ * @dev: Platform device
+ *
+ * In specific conditions (involving usb hubs) dwc2 devices can create a
+ * lot of interrupts, even to the point of overwhelming devices running
+ * at low frequencies. Some devices need to do special clock handling
+ * at shutdown-time which may bring the system clock below the threshold
+ * of being able to handle the dwc2 interrupts. Disabling dwc2-irqs
+ * prevents reboots/poweroffs from getting stuck in such cases.
+ */
+static void dwc2_driver_shutdown(struct platform_device *dev)
+{
+       struct dwc2_hsotg *hsotg = platform_get_drvdata(dev);
+
+       disable_irq(hsotg->irq);
+}
+
 static const struct of_device_id dwc2_of_match_table[] = {
        { .compatible = "brcm,bcm2835-usb", .data = &params_bcm2835 },
        { .compatible = "hisilicon,hi6220-usb", .data = &params_hi6220 },
@@ -435,7 +454,6 @@ static int dwc2_driver_probe(struct platform_device *dev)
        struct dwc2_hsotg *hsotg;
        struct resource *res;
        int retval;
-       int irq;
 
        match = of_match_device(dwc2_of_match_table, &dev->dev);
        if (match && match->data) {
@@ -490,15 +508,15 @@ static int dwc2_driver_probe(struct platform_device *dev)
 
        dwc2_set_all_params(hsotg->core_params, -1);
 
-       irq = platform_get_irq(dev, 0);
-       if (irq < 0) {
+       hsotg->irq = platform_get_irq(dev, 0);
+       if (hsotg->irq < 0) {
                dev_err(&dev->dev, "missing IRQ resource\n");
-               return irq;
+               return hsotg->irq;
        }
 
        dev_dbg(hsotg->dev, "registering common handler for irq%d\n",
-               irq);
-       retval = devm_request_irq(hsotg->dev, irq,
+               hsotg->irq);
+       retval = devm_request_irq(hsotg->dev, hsotg->irq,
                                  dwc2_handle_common_intr, IRQF_SHARED,
                                  dev_name(hsotg->dev), hsotg);
        if (retval)
@@ -523,14 +541,14 @@ static int dwc2_driver_probe(struct platform_device *dev)
        dwc2_force_dr_mode(hsotg);
 
        if (hsotg->dr_mode != USB_DR_MODE_HOST) {
-               retval = dwc2_gadget_init(hsotg, irq);
+               retval = dwc2_gadget_init(hsotg, hsotg->irq);
                if (retval)
                        goto error;
                hsotg->gadget_enabled = 1;
        }
 
        if (hsotg->dr_mode != USB_DR_MODE_PERIPHERAL) {
-               retval = dwc2_hcd_init(hsotg, irq);
+               retval = dwc2_hcd_init(hsotg, hsotg->irq);
                if (retval) {
                        if (hsotg->gadget_enabled)
                                dwc2_hsotg_remove(hsotg);
@@ -597,6 +615,7 @@ static struct platform_driver dwc2_platform_driver = {
        },
        .probe = dwc2_driver_probe,
        .remove = dwc2_driver_remove,
+       .shutdown = dwc2_driver_shutdown,
 };
 
 module_platform_driver(dwc2_platform_driver);