linux-kernel - [PATCH v4 5/5] usb: dwc3: imx8mp: Set out of band wakeup for i.MX95

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Message-Id: <20250922-pm-v4-v4-5-ef48428e8fe0@nxp.com>
Date: Mon, 22 Sep 2025 10:21:10 +0800
From: Peng Fan <peng.fan@....com>
To: "Rafael J. Wysocki" <rafael@...nel.org>, 
 Pavel Machek <pavel@...nel.org>, Len Brown <lenb@...nel.org>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Danilo Krummrich <dakr@...nel.org>, Ulf Hansson <ulf.hansson@...aro.org>, 
 Peter Chen <peter.chen@...nel.org>, Shawn Guo <shawnguo@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>, 
 Thinh Nguyen <Thinh.Nguyen@...opsys.com>
Cc: linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-usb@...r.kernel.org, imx@...ts.linux.dev, 
 linux-arm-kernel@...ts.infradead.org, Peng Fan <peng.fan@....com>, 
 Xu Yang <xu.yang_2@....com>
Subject: [PATCH v4 5/5] usb: dwc3: imx8mp: Set out of band wakeup for
 i.MX95

i.MX95 DWC3 inside HSIOMIX could still wakeup Linux, even if HSIOMIX
power domain(Digital logic) is off. There is still always on logic
have the wakeup capability which is out band wakeup capbility.

So use device_set_out_band_wakeup for i.MX95 to make sure DWC3 could
wakeup system even if HSIOMIX power domain is in off state.

Acked-by: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
Tested-by: Xu Yang <xu.yang_2@....com>
Reviewed-by: Xu Yang <xu.yang_2@....com>
Signed-off-by: Peng Fan <peng.fan@....com>
---
 drivers/usb/dwc3/dwc3-imx8mp.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/dwc3/dwc3-imx8mp.c b/drivers/usb/dwc3/dwc3-imx8mp.c
index bce6af82f54c24423c1e1fcc46913c8456b6f035..225d59e9c1901c36be1fc18311dace6cdd45de75 100644
--- a/drivers/usb/dwc3/dwc3-imx8mp.c
+++ b/drivers/usb/dwc3/dwc3-imx8mp.c
@@ -334,10 +334,15 @@ static int dwc3_imx8mp_pm_suspend(struct device *dev)

 	ret = dwc3_imx8mp_suspend(dwc3_imx, PMSG_SUSPEND);

-	if (device_may_wakeup(dwc3_imx->dev))
+	if (device_may_wakeup(dwc3_imx->dev)) {
 		enable_irq_wake(dwc3_imx->irq);
-	else
+
+		if (device_is_compatible(dev, "fsl,imx95-dwc3"))
+			device_set_out_band_wakeup(dev);
+
+	} else {
 		clk_disable_unprepare(dwc3_imx->suspend_clk);
+	}

 	clk_disable_unprepare(dwc3_imx->hsio_clk);
 	dev_dbg(dev, "dwc3 imx8mp pm suspend.\n");

-- 
2.37.1