linux-kernel - [PATCH 1/2] usb: dwc3: support continuous runtime PM with dual role

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Message-Id: <20200318083508.20781-1-martin.kepplinger@puri.sm>
Date:   Wed, 18 Mar 2020 09:35:07 +0100
From:   Martin Kepplinger <martin.kepplinger@...i.sm>
To:     balbi@...nel.org, robh@...nel.org
Cc:     gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Martin Kepplinger <martin.kepplinger@...i.sm>
Subject: [PATCH 1/2] usb: dwc3: support continuous runtime PM with dual role

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 <martin.kepplinger@...i.sm>
---
 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