[PATCH v7 5/5] usb: dwc3: qcom: Keep power domain on to support wakeup

From: Sandeep Maheswaram
Date: Wed Apr 28 2021 - 01:12:47 EST


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@xxxxxxxxxxxxxx>
---
drivers/usb/dwc3/dwc3-qcom.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)

diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
index 82125bc..1e220af 100644
--- a/drivers/usb/dwc3/dwc3-qcom.c
+++ b/drivers/usb/dwc3/dwc3-qcom.c
@@ -17,9 +17,11 @@
#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>
+#include <linux/usb/hcd.h>

#include "core.h"

@@ -354,10 +356,19 @@ static int dwc3_qcom_suspend(struct dwc3_qcom *qcom)
{
u32 val;
int i, ret;
+ struct dwc3 *dwc = platform_get_drvdata(qcom->dwc3);
+ struct usb_hcd *hcd;
+ struct generic_pm_domain *genpd = pd_to_genpd(qcom->dev->pm_domain);

if (qcom->is_suspended)
return 0;

+ if (dwc->xhci) {
+ hcd = platform_get_drvdata(dwc->xhci);
+ if (usb_wakeup_enabled_descendants(hcd->self.root_hub))
+ 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 +393,15 @@ 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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