[PATCH v2 2/7] usb: dwc3: qcom: Distinguish PM and runtime suspend/resume paths

[Faisal Hassan <faisal.hassan@oss.qualcomm.com>]

The dwc3_qcom_suspend() and dwc3_qcom_resume() functions
handle both system PM and runtime PM paths but cannot
differentiate between them, preventing distinct power
management strategies.

Refactor suspend/resume functions to accept pm_message_t
instead of boolean wakeup flags. Use PMSG_IS_AUTO()
to identify runtime PM (PMSG_AUTO_SUSPEND/RESUME) versus
system PM (PMSG_SUSPEND/RESUME) paths.

Preserve existing wakeup behavior: always enable wakeup
for runtime suspend, check device_may_wakeup() for system
suspend.

Follow dwc3/core.c pattern to enable future per-path
strategies like differentiated power states.

Co-developed-by: Sriram Dash <sriram.dash@oss.qualcomm.com>
Signed-off-by: Sriram Dash <sriram.dash@oss.qualcomm.com>
Signed-off-by: Faisal Hassan <faisal.hassan@oss.qualcomm.com>
---
 drivers/usb/dwc3/dwc3-qcom.c | 34 ++++++++++++++++++++++++++--------
 1 file changed, 26 insertions(+), 8 deletions(-)

diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
index 49698a31b2f4..6d25f81800a7 100644
--- a/drivers/usb/dwc3/dwc3-qcom.c
+++ b/drivers/usb/dwc3/dwc3-qcom.c
@@ -335,14 +335,24 @@ static void dwc3_qcom_enable_interrupts(struct dwc3_qcom *qcom)
 		dwc3_qcom_enable_port_interrupts(&qcom->ports[i]);
 }
 
-static int dwc3_qcom_suspend(struct dwc3_qcom *qcom, bool wakeup)
+static int dwc3_qcom_suspend(struct dwc3_qcom *qcom, pm_message_t msg)
 {
 	u32 val;
 	int i, ret;
+	bool wakeup;
 
 	if (qcom->is_suspended)
 		return 0;
 
+	/*
+	 * For runtime suspend, always enable wakeup.
+	 * For system suspend, check device wakeup capability.
+	 */
+	if (PMSG_IS_AUTO(msg))
+		wakeup = true;
+	else
+		wakeup = device_may_wakeup(qcom->dev);
+
 	for (i = 0; i < qcom->num_ports; i++) {
 		val = readl(qcom->qscratch_base + pwr_evnt_irq_stat_reg[i]);
 		if (!(val & PWR_EVNT_LPM_IN_L2_MASK))
@@ -369,14 +379,24 @@ static int dwc3_qcom_suspend(struct dwc3_qcom *qcom, bool wakeup)
 	return 0;
 }
 
-static int dwc3_qcom_resume(struct dwc3_qcom *qcom, bool wakeup)
+static int dwc3_qcom_resume(struct dwc3_qcom *qcom, pm_message_t msg)
 {
 	int ret;
 	int i;
+	bool wakeup;
 
 	if (!qcom->is_suspended)
 		return 0;
 
+	/*
+	 * For runtime resume, always assume wakeup was enabled.
+	 * For system resume, check device wakeup capability.
+	 */
+	if (PMSG_IS_AUTO(msg))
+		wakeup = true;
+	else
+		wakeup = device_may_wakeup(qcom->dev);
+
 	if (dwc3_qcom_is_host(qcom) && wakeup)
 		dwc3_qcom_disable_interrupts(qcom);
 
@@ -759,14 +779,13 @@ static int dwc3_qcom_pm_suspend(struct device *dev)
 {
 	struct dwc3 *dwc = dev_get_drvdata(dev);
 	struct dwc3_qcom *qcom = to_dwc3_qcom(dwc);
-	bool wakeup = device_may_wakeup(dev);
 	int ret;
 
 	ret = dwc3_pm_suspend(&qcom->dwc);
 	if (ret)
 		return ret;
 
-	ret = dwc3_qcom_suspend(qcom, wakeup);
+	ret = dwc3_qcom_suspend(qcom, PMSG_SUSPEND);
 	if (ret)
 		return ret;
 
@@ -779,10 +798,9 @@ static int dwc3_qcom_pm_resume(struct device *dev)
 {
 	struct dwc3 *dwc = dev_get_drvdata(dev);
 	struct dwc3_qcom *qcom = to_dwc3_qcom(dwc);
-	bool wakeup = device_may_wakeup(dev);
 	int ret;
 
-	ret = dwc3_qcom_resume(qcom, wakeup);
+	ret = dwc3_qcom_resume(qcom, PMSG_RESUME);
 	if (ret)
 		return ret;
 
@@ -819,7 +837,7 @@ static int dwc3_qcom_runtime_suspend(struct device *dev)
 	if (ret)
 		return ret;
 
-	return dwc3_qcom_suspend(qcom, true);
+	return dwc3_qcom_suspend(qcom, PMSG_AUTO_SUSPEND);
 }
 
 static int dwc3_qcom_runtime_resume(struct device *dev)
@@ -828,7 +846,7 @@ static int dwc3_qcom_runtime_resume(struct device *dev)
 	struct dwc3_qcom *qcom = to_dwc3_qcom(dwc);
 	int ret;
 
-	ret = dwc3_qcom_resume(qcom, true);
+	ret = dwc3_qcom_resume(qcom, PMSG_AUTO_RESUME);
 	if (ret)
 		return ret;
 
-- 
2.34.1