linux-kernel - [v15 2/6] usb: host: xhci-plat: Enable wakeup based on children wakeup status

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Date:   Thu, 5 May 2022 14:26:09 +0530
From:   Krishna Kurapati <quic_kriskura@...cinc.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <balbi@...nel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Doug Anderson <dianders@...omium.org>,
        "Matthias Kaehlcke" <mka@...omium.org>,
        Mathias Nyman <mathias.nyman@...el.com>
CC:     <devicetree@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-pm@...r.kernel.org>, <quic_pkondeti@...cinc.com>,
        <quic_ppratap@...cinc.com>, <quic_vpulyala@...cinc.com>,
        Krishna Kurapati <quic_kriskura@...cinc.com>
Subject: [v15 2/6] usb: host: xhci-plat: Enable wakeup based on children wakeup status

device_wakeup_path() tells if any of the children devices needs
wakeup. Use this hint to enable/disable wakeup of our device. This
helps the parent device of xhci-plat (like sysdev) to retrieve
the wakeup setting via device_wakeup_path().

Signed-off-by: Krishna Kurapati <quic_kriskura@...cinc.com>
---
 drivers/usb/host/xhci-plat.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index 649ffd8..ad585fa 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -415,6 +415,14 @@ static int __maybe_unused xhci_plat_suspend(struct device *dev)
 	if (pm_runtime_suspended(dev))
 		pm_runtime_resume(dev);
 
+	if (device_wakeup_path(dev)) {
+		if (!device_may_wakeup(dev))
+			device_wakeup_enable(dev);
+	} else {
+		if (device_may_wakeup(dev))
+			device_wakeup_disable(dev);
+	}
+
 	ret = xhci_priv_suspend_quirk(hcd);
 	if (ret)
 		return ret;
-- 
2.7.4