linux-kernel - [PATCH] usb: dwc3: qcom: Honor wakeup enabled/disabled state

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Message-Id: <20200915123123.1.I44954d9e1169f2cf5c44e6454d357c75ddfa99a2@changeid>
Date:   Tue, 15 Sep 2020 12:31:27 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Douglas Anderson <dianders@...omium.org>,
        Manu Gautam <mgautam@...eaurora.org>,
        linux-usb@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        Lee Jones <lee.jones@...aro.org>, linux-kernel@...r.kernel.org,
        Matthias Kaehlcke <mka@...omium.org>
Subject: [PATCH] usb: dwc3: qcom: Honor wakeup enabled/disabled state

The dwc3-qcom currently enables wakeup interrupts unconditionally
when suspending, however this should not be done when wakeup is
disabled (e.g. through the sysfs attribute power/wakeup). Only
enable wakeup interrupts when device_may_wakeup() returns true.

Fixes: a4333c3a6ba9 ("usb: dwc3: Add Qualcomm DWC3 glue driver")
Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
---

 drivers/usb/dwc3/dwc3-qcom.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
index e1e78e9824b1..56d14c09506d 100644
--- a/drivers/usb/dwc3/dwc3-qcom.c
+++ b/drivers/usb/dwc3/dwc3-qcom.c
@@ -251,8 +251,10 @@ static int dwc3_qcom_suspend(struct dwc3_qcom *qcom)
 	for (i = qcom->num_clocks - 1; i >= 0; i--)
 		clk_disable_unprepare(qcom->clks[i]);
 
+	if (device_may_wakeup(qcom->dev))
+		dwc3_qcom_enable_interrupts(qcom);
+
 	qcom->is_suspended = true;
-	dwc3_qcom_enable_interrupts(qcom);
 
 	return 0;
 }
@@ -265,7 +267,8 @@ static int dwc3_qcom_resume(struct dwc3_qcom *qcom)
 	if (!qcom->is_suspended)
 		return 0;
 
-	dwc3_qcom_disable_interrupts(qcom);
+	if (device_may_wakeup(qcom->dev))
+		dwc3_qcom_disable_interrupts(qcom);
 
 	for (i = 0; i < qcom->num_clocks; i++) {
 		ret = clk_prepare_enable(qcom->clks[i]);
-- 
2.28.0.618.gf4bc123cb7-goog