linux-kernel - [PATCH v2 5/9] usb: dwc3: qcom: fix runtime PM wakeup

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Date:   Thu,  4 Aug 2022 17:09:57 +0200
From:   Johan Hovold <johan+linaro@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <balbi@...nel.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Krishna Kurapati <quic_kriskura@...cinc.com>,
        Stephen Boyd <swboyd@...omium.org>,
        Doug Anderson <dianders@...omium.org>,
        "Matthias Kaehlcke" <mka@...omium.org>,
        Pavankumar Kondeti <quic_pkondeti@...cinc.com>,
        quic_ppratap@...cinc.com, quic_vpulyala@...cinc.com,
        linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Johan Hovold <johan+linaro@...nel.org>
Subject: [PATCH v2 5/9] usb: dwc3: qcom: fix runtime PM wakeup

A device must enable wakeups during runtime suspend regardless of
whether it is capable and allowed to wake the system up from system
suspend.

Fixes: 2664deb09306 ("usb: dwc3: qcom: Honor wakeup enabled/disabled state")
Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
---
 drivers/usb/dwc3/dwc3-qcom.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
index 6884026b9fad..05b4666fde14 100644
--- a/drivers/usb/dwc3/dwc3-qcom.c
+++ b/drivers/usb/dwc3/dwc3-qcom.c
@@ -397,7 +397,7 @@ static void dwc3_qcom_enable_interrupts(struct dwc3_qcom *qcom)
 	dwc3_qcom_enable_wakeup_irq(qcom->ss_phy_irq, 0);
 }
 
-static int dwc3_qcom_suspend(struct dwc3_qcom *qcom)
+static int dwc3_qcom_suspend(struct dwc3_qcom *qcom, bool wakeup)
 {
 	u32 val;
 	int i, ret;
@@ -416,7 +416,7 @@ static int dwc3_qcom_suspend(struct dwc3_qcom *qcom)
 	if (ret)
 		dev_warn(qcom->dev, "failed to disable interconnect: %d\n", ret);
 
-	if (device_may_wakeup(qcom->dev)) {
+	if (wakeup) {
 		qcom->usb2_speed = dwc3_qcom_read_usb2_speed(qcom);
 		dwc3_qcom_enable_interrupts(qcom);
 	}
@@ -426,7 +426,7 @@ static int dwc3_qcom_suspend(struct dwc3_qcom *qcom)
 	return 0;
 }
 
-static int dwc3_qcom_resume(struct dwc3_qcom *qcom)
+static int dwc3_qcom_resume(struct dwc3_qcom *qcom, bool wakeup)
 {
 	int ret;
 	int i;
@@ -434,7 +434,7 @@ static int dwc3_qcom_resume(struct dwc3_qcom *qcom)
 	if (!qcom->is_suspended)
 		return 0;
 
-	if (device_may_wakeup(qcom->dev))
+	if (wakeup)
 		dwc3_qcom_disable_interrupts(qcom);
 
 	for (i = 0; i < qcom->num_clocks; i++) {
@@ -945,9 +945,11 @@ static int dwc3_qcom_remove(struct platform_device *pdev)
 static int __maybe_unused dwc3_qcom_pm_suspend(struct device *dev)
 {
 	struct dwc3_qcom *qcom = dev_get_drvdata(dev);
+	bool wakeup = device_may_wakeup(dev);
 	int ret = 0;
 
-	ret = dwc3_qcom_suspend(qcom);
+
+	ret = dwc3_qcom_suspend(qcom, wakeup);
 	if (!ret)
 		qcom->pm_suspended = true;
 
@@ -957,9 +959,10 @@ static int __maybe_unused dwc3_qcom_pm_suspend(struct device *dev)
 static int __maybe_unused dwc3_qcom_pm_resume(struct device *dev)
 {
 	struct dwc3_qcom *qcom = dev_get_drvdata(dev);
+	bool wakeup = device_may_wakeup(dev);
 	int ret;
 
-	ret = dwc3_qcom_resume(qcom);
+	ret = dwc3_qcom_resume(qcom, wakeup);
 	if (!ret)
 		qcom->pm_suspended = false;
 
@@ -970,14 +973,14 @@ static int __maybe_unused dwc3_qcom_runtime_suspend(struct device *dev)
 {
 	struct dwc3_qcom *qcom = dev_get_drvdata(dev);
 
-	return dwc3_qcom_suspend(qcom);
+	return dwc3_qcom_suspend(qcom, true);
 }
 
 static int __maybe_unused dwc3_qcom_runtime_resume(struct device *dev)
 {
 	struct dwc3_qcom *qcom = dev_get_drvdata(dev);
 
-	return dwc3_qcom_resume(qcom);
+	return dwc3_qcom_resume(qcom, true);
 }
 
 static const struct dev_pm_ops dwc3_qcom_dev_pm_ops = {
-- 
2.35.1