[PATCH v14 6/7] usb: dwc3: qcom: Keep power domain on to retain controller status

[Sandeep Maheswaram <quic_c_sanm@xxxxxxxxxxx>]

Keep the power domain always on during runtime suspend or if the
controller supports wakeup in order to retain controller status
and to support wakeup from devices.

Signed-off-by: Sandeep Maheswaram <quic_c_sanm@xxxxxxxxxxx>
---
v14:
Removed the unwanted spaces between the type
and the variable name in dwc3_qcom_probe.
Avoiding device_may_wakeup condition check multiple times.

v13:
Added GENPD_FLAG_RPM_ALWAYS_ON irrespective of wakeup capability.
Enable GENPD_FLAG_ALWAYS_ON only if device_may_wakeup is true.

 drivers/usb/dwc3/dwc3-qcom.c | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
index 9804a19..1f9589a 100644
--- a/drivers/usb/dwc3/dwc3-qcom.c
+++ b/drivers/usb/dwc3/dwc3-qcom.c
@@ -17,6 +17,7 @@
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/phy/phy.h>
+#include <linux/pm_domain.h>
 #include <linux/usb/of.h>
 #include <linux/reset.h>
 #include <linux/iopoll.h>
@@ -718,12 +719,13 @@ dwc3_qcom_create_urs_usb_platdev(struct device *dev)
 
 static int dwc3_qcom_probe(struct platform_device *pdev)
 {
-	struct device_node	*np = pdev->dev.of_node;
-	struct device		*dev = &pdev->dev;
-	struct dwc3_qcom	*qcom;
-	struct resource		*res, *parent_res = NULL;
-	int			ret, i;
-	bool			ignore_pipe_clk;
+	struct device_node *np = pdev->dev.of_node;
+	struct device *dev = &pdev->dev;
+	struct dwc3_qcom *qcom;
+	struct resource	*res, *parent_res = NULL;
+	int ret, i;
+	bool ignore_pipe_clk;
+	struct generic_pm_domain *genpd;
 
 	qcom = devm_kzalloc(&pdev->dev, sizeof(*qcom), GFP_KERNEL);
 	if (!qcom)
@@ -732,6 +734,8 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, qcom);
 	qcom->dev = &pdev->dev;
 
+	genpd = pd_to_genpd(qcom->dev->pm_domain);
+
 	if (has_acpi_companion(dev)) {
 		qcom->acpi_pdata = acpi_device_get_match_data(dev);
 		if (!qcom->acpi_pdata) {
@@ -839,7 +843,12 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
 	if (ret)
 		goto interconnect_exit;
 
-	device_init_wakeup(&pdev->dev, 1);
+	genpd->flags |= GENPD_FLAG_RPM_ALWAYS_ON;
+
+	if (device_may_wakeup(&qcom->dwc3->dev)) {
+		genpd->flags |= GENPD_FLAG_ALWAYS_ON;
+		device_init_wakeup(&pdev->dev, true);
+	}
 	qcom->is_suspended = false;
 	pm_runtime_set_active(dev);
 	pm_runtime_enable(dev);
-- 
2.7.4