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authorHeiko Stübner <heiko.stuebner@collabora.com>2015-12-18 21:30:59 +0300
committerFelipe Balbi <balbi@ti.com>2015-12-22 21:12:51 +0300
commita40a00318c7fcdd23e73cfffac0e33430a43a3e3 (patch)
tree4d371b3295e3cc4e1a53bf670c86f4c864d6f26d /drivers/usb/dwc2
parentea4a8cb1c2b47570e77f4489659e2c653ca66f9e (diff)
downloadlinux-a40a00318c7fcdd23e73cfffac0e33430a43a3e3.tar.xz
usb: dwc2: add shutdown callback to platform variant
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 in a shutdown callbacks prevents reboots/poweroffs from getting stuck in such cases. The hsotg struct already contains an unused irq element, so we can just use it to store the irq number for the shutdown callback. Reviewed-by: Douglas Anderson <dianders@chromium.org> Acked-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Heiko Stuebner <heiko.stuebner@collabora.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
Diffstat (limited to 'drivers/usb/dwc2')
-rw-r--r--drivers/usb/dwc2/platform.c35
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 = &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);