linux-kernel - [PATCH v10 2/6] usb: dwc3: core: Host wake up support from system suspend

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Date:   Mon, 17 Jan 2022 11:14:04 +0530
From:   Sandeep Maheswaram <quic_c_sanm@...cinc.com>
To:     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:     <linux-arm-msm@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <quic_pkondeti@...cinc.com>,
        <quic_ppratap@...cinc.com>,
        Sandeep Maheswaram <quic_c_sanm@...cinc.com>
Subject: [PATCH v10 2/6] usb: dwc3: core: Host wake up support from system suspend

Avoiding phy powerdown when wakeup capable devices are connected
by checking wakeup property of xhci plat device.
Phy should be on to wake up the device from suspend using wakeup capable
devices such as keyboard and mouse.

Signed-off-by: Sandeep Maheswaram <quic_c_sanm@...cinc.com>
Tested-by: Brian Norris <briannorris@...omium.org>
---
Remove redundant else part in dwc3_resume_common. This will not be
required if GDSC is always on during suspend/resume.


 drivers/usb/dwc3/core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index f4c0995..e7a5e3f 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -1789,7 +1789,7 @@ 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_may_wakeup(&dwc->xhci->dev)) {
 			dwc3_core_exit(dwc);
 			break;
 		}
@@ -1850,7 +1850,7 @@ 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_may_wakeup(&dwc->xhci->dev)) {
 			ret = dwc3_core_init_for_resume(dwc);
 			if (ret)
 				return ret;
-- 
2.7.4