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Subject[PATCH v20 2/5] usb: dwc3: core: Host wake up support from system suspend
Date
From: Sandeep Maheswaram <quic_c_sanm@quicinc.com>

Check wakeup-source property for dwc3 core node to set the
wakeup capability. Drop the device_init_wakeup call from
runtime suspend and resume.

If the dwc3 is wakeup capable, don't power down the USB PHY(s).
The glue drivers are expected to take care of configuring the
additional wakeup settings if needed based on the dwc3 wakeup
capability status. In some SOC designs, powering off the PHY is
resulting in higher leakage, so this patch save power on such boards.

Signed-off-by: Sandeep Maheswaram <quic_c_sanm@quicinc.com>
Signed-off-by: Krishna Kurapati <quic_kriskura@quicinc.com>
Reviewed-by: Pavankumar Kondeti <quic_pkondeti@quicinc.com>
---
drivers/usb/dwc3/core.c | 9 +++------
1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index e027c04..b99d3c2 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -1787,6 +1787,7 @@ static int dwc3_probe(struct platform_device *pdev)

platform_set_drvdata(pdev, dwc);
dwc3_cache_hwparams(dwc);
+ device_init_wakeup(&pdev->dev, of_property_read_bool(dev->of_node, "wakeup-source"));

spin_lock_init(&dwc->lock);
mutex_init(&dwc->mutex);
@@ -1948,7 +1949,7 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg)
dwc3_core_exit(dwc);
break;
case DWC3_GCTL_PRTCAP_HOST:
- if (!PMSG_IS_AUTO(msg)) {
+ if (!PMSG_IS_AUTO(msg) && !device_can_wakeup(dwc->dev)) {
dwc3_core_exit(dwc);
break;
}
@@ -2009,7 +2010,7 @@ static int dwc3_resume_common(struct dwc3 *dwc, pm_message_t msg)
spin_unlock_irqrestore(&dwc->lock, flags);
break;
case DWC3_GCTL_PRTCAP_HOST:
- if (!PMSG_IS_AUTO(msg)) {
+ if (!PMSG_IS_AUTO(msg) && !device_can_wakeup(dwc->dev)) {
ret = dwc3_core_init_for_resume(dwc);
if (ret)
return ret;
@@ -2086,8 +2087,6 @@ static int dwc3_runtime_suspend(struct device *dev)
if (ret)
return ret;

- device_init_wakeup(dev, true);
-
return 0;
}

@@ -2096,8 +2095,6 @@ static int dwc3_runtime_resume(struct device *dev)
struct dwc3 *dwc = dev_get_drvdata(dev);
int ret;

- device_init_wakeup(dev, false);
-
ret = dwc3_resume_common(dwc, PMSG_AUTO_RESUME);
if (ret)
return ret;
--
2.7.4
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