[PATCH 1/2] usb: dwc3: support continuous runtime PM with dual role
From: Martin Kepplinger <hidden>
Date: 2020-03-18 08:35:24
Also in:
linux-usb, lkml
Subsystem:
designware usb3 drd ip driver, the rest, usb subsystem · Maintainers:
Thinh Nguyen, Linus Torvalds, Greg Kroah-Hartman
The DRD module calls dwc3_set_mode() on role switches, i.e. when a device is being pugged in. In order to support continuous runtime power management when plugging in / unplugging a cable, we need to call pm_runtime_get() in this path. Signed-off-by: Martin Kepplinger <redacted> --- drivers/usb/dwc3/core.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index edc17155cb2b..7743c4de82e9 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c@@ -196,11 +196,16 @@ void dwc3_set_mode(struct dwc3 *dwc, u32 mode) { unsigned long flags; + pm_runtime_get(dwc->dev); + spin_lock_irqsave(&dwc->lock, flags); dwc->desired_dr_role = mode; spin_unlock_irqrestore(&dwc->lock, flags); queue_work(system_freezable_wq, &dwc->drd_work); + + pm_runtime_mark_last_busy(dwc->dev); + pm_runtime_put_autosuspend(dwc->dev); } u32 dwc3_core_fifo_space(struct dwc3_ep *dep, u8 type)
--
2.20.1