Add support for basic power management on
the dwc3 driver. While there is still lots
to improve for full PM support, this minimal
patch will already make sure that we survive
suspend-to-ram and suspend-to-disk without
major issues.
Cc: Vikas C Sajjan <vikas.sajjan@xxxxxxxxxx>
Signed-off-by: Felipe Balbi <balbi@xxxxxx>
---
drivers/usb/dwc3/core.c | 108 ++++++++++++++++++++++++++++++++++++++++++++++
drivers/usb/dwc3/core.h | 6 +++
drivers/usb/dwc3/gadget.c | 57 ++++++++++++++++++++++++
3 files changed, 171 insertions(+)
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index fb93918..466b894 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -583,11 +583,119 @@ static int dwc3_remove(struct platform_device *pdev)
return 0;
}
+#ifdef CONFIG_PM
+static int dwc3_prepare(struct device *dev)
+{
+ struct dwc3 *dwc = dev_get_drvdata(dev);
+ unsigned long flags;
+
+ spin_lock_irqsave(&dwc->lock, flags);
+
+ switch (dwc->mode) {
+ case DWC3_MODE_DEVICE:
+ case DWC3_MODE_DRD:
+ dwc3_gadget_prepare(dwc);
+ /* FALLTHROUGH */
+ case DWC3_MODE_HOST:
+ default:
+ dwc3_event_buffers_cleanup(dwc);
+ break;
+ }
+
+ spin_unlock_irqrestore(&dwc->lock, flags);
+
+ return 0;
+}
+
+static void dwc3_complete(struct device *dev)
+{
+ struct dwc3 *dwc = dev_get_drvdata(dev);
+ unsigned long flags;
+
+ spin_lock_irqsave(&dwc->lock, flags);
+
+ switch (dwc->mode) {
+ case DWC3_MODE_DEVICE:
+ case DWC3_MODE_DRD:
+ dwc3_gadget_complete(dwc);
+ /* FALLTHROUGH */
+ case DWC3_MODE_HOST:
+ default:
+ dwc3_event_buffers_setup(dwc);
+ break;
+ }
+
+ spin_unlock_irqrestore(&dwc->lock, flags);
+}
+
+static int dwc3_suspend(struct device *dev)
+{
+ struct dwc3 *dwc = dev_get_drvdata(dev);
+ unsigned long flags;
+
+ spin_lock_irqsave(&dwc->lock, flags);
+
+ switch (dwc->mode) {
+ case DWC3_MODE_DEVICE:
+ case DWC3_MODE_DRD:
+ dwc3_gadget_suspend(dwc);
+ /* FALLTHROUGH */
+ case DWC3_MODE_HOST:
+ default:
+ /* do nothing */
+ break;
+ }
+
+ spin_unlock_irqrestore(&dwc->lock, flags);
+
+ return 0;
+}
+
+static int dwc3_resume(struct device *dev)
+{
+ struct dwc3 *dwc = dev_get_drvdata(dev);
+ unsigned long flags;
+
+ spin_lock_irqsave(&dwc->lock, flags);
+
+ switch (dwc->mode) {
+ case DWC3_MODE_DEVICE:
+ case DWC3_MODE_DRD:
+ dwc3_gadget_resume(dwc);
+ /* FALLTHROUGH */
+ case DWC3_MODE_HOST:
+ default:
+ /* do nothing */
+ break;
+ }
+
+ spin_unlock_irqrestore(&dwc->lock, flags);
+
+ pm_runtime_disable(dev);
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
+
+ return 0;
+}
+
+static const struct dev_pm_ops dwc3_dev_pm_ops = {
+ .prepare = dwc3_prepare,
+ .complete = dwc3_complete,
+
+ SET_SYSTEM_SLEEP_PM_OPS(dwc3_suspend, dwc3_resume)
+};
+
+#define DWC3_PM_OPS &(dwc3_dev_pm_ops)
+#else
+#define DWC3_PM_OPS NULL
+#endif
+
static struct platform_driver dwc3_driver = {
.probe = dwc3_probe,
.remove = dwc3_remove,
.driver = {
.name = "dwc3",
+ .pm = DWC3_PM_OPS,
},
};
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index e8d74a7..6f4e8ba 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -862,4 +862,10 @@ void dwc3_host_exit(struct dwc3 *dwc);
int dwc3_gadget_init(struct dwc3 *dwc);
void dwc3_gadget_exit(struct dwc3 *dwc);
+/* power management interface */
+int dwc3_gadget_prepare(struct dwc3 *dwc);
+void dwc3_gadget_complete(struct dwc3 *dwc);
+int dwc3_gadget_suspend(struct dwc3 *dwc);
+int dwc3_gadget_resume(struct dwc3 *dwc);
+
#endif /* __DRIVERS_USB_DWC3_CORE_H */
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 2656cca..b225723 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2530,6 +2530,8 @@ err0:
return ret;
}
+/* -------------------------------------------------------------------------- */
+
void dwc3_gadget_exit(struct dwc3 *dwc)
{
usb_del_gadget_udc(&dwc->gadget);
@@ -2547,3 +2549,58 @@ void dwc3_gadget_exit(struct dwc3 *dwc)
dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
dwc->ctrl_req, dwc->ctrl_req_addr);
}
+
+int dwc3_gadget_prepare(struct dwc3 *dwc)
+{
+ if (dwc->pullups_connected)
+ dwc3_gadget_disable_irq(dwc);
+
+ return 0;
+}
+
+void dwc3_gadget_complete(struct dwc3 *dwc)
+{
+ if (dwc->pullups_connected) {
+ dwc3_gadget_enable_irq(dwc);
+ dwc3_gadget_run_stop(dwc, true);
+ }
+}
+
+int dwc3_gadget_suspend(struct dwc3 *dwc)
+{
+ __dwc3_gadget_ep_disable(dwc->eps[0]);
+ __dwc3_gadget_ep_disable(dwc->eps[1]);
+
+ return 0;
+}
+
+int dwc3_gadget_resume(struct dwc3 *dwc)
+{
+ struct dwc3_ep *dep;
+ int ret;
+
+ /* Start with SuperSpeed Default */
+ dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
+
+ dep = dwc->eps[0];
+ ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false);
+ if (ret)
+ goto err0;
+
+ dep = dwc->eps[1];
+ ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false);
+ if (ret)
+ goto err1;
+
+ /* begin to receive SETUP packets */
+ dwc->ep0state = EP0_SETUP_PHASE;
+ dwc3_ep0_out_start(dwc);
+
+ return 0;
+
+err1:
+ __dwc3_gadget_ep_disable(dwc->eps[0]);
+
+err0:
+ return ret;
+}
--
1.8.1.rc1.5.g7e0651a
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