linux-kernel - Re: [PATCH v2 3/3] usb: dwc3: imx8mp: Set out of band wakeup for i.MX95

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Message-ID: <20250805234044.j75p6bqfbjidxm3b@synopsys.com>
Date: Tue, 5 Aug 2025 23:40:45 +0000
From: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
To: Peng Fan <peng.fan@....com>
CC: Ulf Hansson <ulf.hansson@...aro.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>, Len Brown <lenb@...nel.org>,
        Pavel Machek <pavel@...nel.org>, Peter Chen <peter.chen@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.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>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Xu Yang <xu.yang_2@....com>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "imx@...ts.linux.dev" <imx@...ts.linux.dev>,
        "arm-scmi@...r.kernel.org" <arm-scmi@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 3/3] usb: dwc3: imx8mp: Set out of band wakeup for
 i.MX95

On Fri, Aug 01, 2025, Peng Fan wrote:
> 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.
> 
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  drivers/usb/dwc3/dwc3-imx8mp.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/usb/dwc3/dwc3-imx8mp.c b/drivers/usb/dwc3/dwc3-imx8mp.c
> index bce6af82f54c24423c1e1fcc46913c8456b6f035..fde158d1f6e3d89d261ed3689a17d703878c7e37 100644
> --- a/drivers/usb/dwc3/dwc3-imx8mp.c
> +++ b/drivers/usb/dwc3/dwc3-imx8mp.c
> @@ -248,6 +248,10 @@ static int dwc3_imx8mp_probe(struct platform_device *pdev)
>  	}
>  
>  	device_set_wakeup_capable(dev, true);
> +
> +	if (device_is_compatible(dev, "fsl,imx95-dwc3"))
> +		device_set_out_band_wakeup(dev, true);
> +
>  	pm_runtime_put(dev);
>  
>  	return 0;
> 
> -- 
> 2.37.1
> 

Acked-by: Thinh Nguyen <Thinh.Nguyen@...opsys.com>

BR,
Thinh