[PATCH v8 6/6] usb: dwc3: qcom: Keep power domain on to support wakeup

[Sandeep Maheswaram <sanm@codeaurora.org>]

If wakeup capable devices are connected to the controller (directly
or through hubs) at suspend time keep the power domain on in order
to support wakeup from these devices.

Signed-off-by: Sandeep Maheswaram <sanm@codeaurora.org>
---
Checking phy_power_off flag instead of usb_wakeup_enabled_descendants 
to keep gdsc active.

 drivers/usb/dwc3/dwc3-qcom.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
index 82125bc..ba31aa3 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>
@@ -355,9 +356,15 @@ static int dwc3_qcom_suspend(struct dwc3_qcom *qcom)
 	u32 val;
 	int i, ret;
 
+	struct dwc3 *dwc = platform_get_drvdata(qcom->dwc3);
+	struct generic_pm_domain *genpd = pd_to_genpd(qcom->dev->pm_domain);
+
 	if (qcom->is_suspended)
 		return 0;
 
+	if (!dwc->phy_power_off && dwc->xhci)
+		genpd->flags |= GENPD_FLAG_ACTIVE_WAKEUP;
+
 	val = readl(qcom->qscratch_base + PWR_EVNT_IRQ_STAT_REG);
 	if (!(val & PWR_EVNT_LPM_IN_L2_MASK))
 		dev_err(qcom->dev, "HS-PHY not in L2\n");
@@ -382,9 +389,15 @@ static int dwc3_qcom_resume(struct dwc3_qcom *qcom)
 	int ret;
 	int i;
 
+	struct dwc3 *dwc = platform_get_drvdata(qcom->dwc3);
+	struct generic_pm_domain *genpd = pd_to_genpd(qcom->dev->pm_domain);
+
 	if (!qcom->is_suspended)
 		return 0;
 
+	if (dwc->xhci)
+		genpd->flags &= ~GENPD_FLAG_ACTIVE_WAKEUP;
+
 	if (device_may_wakeup(qcom->dev))
 		dwc3_qcom_disable_interrupts(qcom);
 
-- 
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