linux-kernel - usb: dwc3: gadget: skip pullup and set

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Date:   Wed, 20 Jan 2021 12:39:28 +0900
From:   Daehwan Jung <dh10.jung@...sung.com>
To:     Felipe Balbi <balbi@...nel.org>
Cc:     Daehwan Jung <dh10.jung@...sung.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: usb: dwc3: gadget: skip pullup and set_speed after suspend

Sometimes dwc3_gadget_pullup and dwc3_gadget_set_speed are called after
entering suspend. That's why it needs to check whether suspend

1. dwc3 sends disconnect uevent and turn off. (suspend)
2. Platform side causes pullup or set_speed(e.g., adbd closes ffs node)
3. It causes unexpected behavior like ITMON error.

Signed-off-by: Daehwan Jung <dh10.jung@...sung.com>
---
 drivers/usb/dwc3/gadget.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index ee44321..d7d4202 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2093,6 +2093,9 @@ static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
 	unsigned long		flags;
 	int			ret;
 
+	if (pm_runtime_suspended(dwc->dev))
+		return 0;
+
 	is_on = !!is_on;
 
 	/*
@@ -2403,6 +2406,9 @@ static void dwc3_gadget_set_speed(struct usb_gadget *g,
 	unsigned long		flags;
 	u32			reg;
 
+	if (pm_runtime_suspended(dwc->dev))
+		return;
+
 	spin_lock_irqsave(&dwc->lock, flags);
 	reg = dwc3_readl(dwc->regs, DWC3_DCFG);
 	reg &= ~(DWC3_DCFG_SPEED_MASK);
-- 
2.7.4