diff options
| -rw-r--r-- | drivers/usb/dwc2/platform.c | 35 |
1 files changed, 27 insertions, 8 deletions
diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c index 1e7cb99d2100..510f787434b3 100644 --- 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 = ¶ms_bcm2835 }, { .compatible = "hisilicon,hi6220-usb", .data = ¶ms_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); |