linux-kernel - Re: [PATCH v3 3/4] usb: chipidea: ci_hdrc_imx: Set out of band wakeup for i.MX95

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Message-ID: <xpso3qwem7d4rsksjazujvfqqvufdmq4vmfp2y7wcqlvk4f5nr@2akfm57mf6jd>
Date: Tue, 2 Sep 2025 16:55:13 +0800
From: Xu Yang <xu.yang_2@....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>, 
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org, 
	imx@...ts.linux.dev, arm-scmi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 3/4] usb: chipidea: ci_hdrc_imx: Set out of band
 wakeup for i.MX95

On Tue, Sep 02, 2025 at 11:33:02AM +0800, Peng Fan wrote:
> i.MX95 USB2 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 usb2 could
> wakeup system even if HSIOMIX power domain is in off state.
> 
> Signed-off-by: Peng Fan <peng.fan@....com>

Tested-by: Xu Yang <xu.yang_2@....com>
Reviewed-by: Xu Yang <xu.yang_2@....com>

> ---
>  drivers/usb/chipidea/ci_hdrc_imx.c | 8 ++++++++
>  include/linux/usb/chipidea.h       | 1 +
>  2 files changed, 9 insertions(+)
> 
> diff --git a/drivers/usb/chipidea/ci_hdrc_imx.c b/drivers/usb/chipidea/ci_hdrc_imx.c
> index d7c2a1a3c2715967203b98c819fa864e06a00a32..a2b3f673dfc1183a02783bf6ef92f8570c6042cf 100644
> --- a/drivers/usb/chipidea/ci_hdrc_imx.c
> +++ b/drivers/usb/chipidea/ci_hdrc_imx.c
> @@ -79,6 +79,10 @@ static const struct ci_hdrc_imx_platform_flag imx8ulp_usb_data = {
>  		CI_HDRC_HAS_PORTSC_PEC_MISSED,
>  };
>  
> +static const struct ci_hdrc_imx_platform_flag imx95_usb_data = {
> +	.flags = CI_HDRC_SUPPORTS_RUNTIME_PM | CI_HDRC_OUT_BAND_WAKEUP,
> +};
> +
>  static const struct ci_hdrc_imx_platform_flag s32g_usb_data = {
>  	.flags = CI_HDRC_DISABLE_HOST_STREAMING,
>  };
> @@ -94,6 +98,7 @@ static const struct of_device_id ci_hdrc_imx_dt_ids[] = {
>  	{ .compatible = "fsl,imx7d-usb", .data = &imx7d_usb_data},
>  	{ .compatible = "fsl,imx7ulp-usb", .data = &imx7ulp_usb_data},
>  	{ .compatible = "fsl,imx8ulp-usb", .data = &imx8ulp_usb_data},
> +	{ .compatible = "fsl,imx95-usb", .data = &imx95_usb_data},
>  	{ .compatible = "nxp,s32g2-usb", .data = &s32g_usb_data},
>  	{ /* sentinel */ }
>  };
> @@ -570,6 +575,9 @@ static int ci_hdrc_imx_probe(struct platform_device *pdev)
>  
>  	device_set_wakeup_capable(dev, true);
>  
> +	if (pdata.flags & CI_HDRC_OUT_BAND_WAKEUP)
> +		device_set_out_band_wakeup(dev, true);
> +
>  	return 0;
>  
>  disable_device:
> diff --git a/include/linux/usb/chipidea.h b/include/linux/usb/chipidea.h
> index e17ebeee24e3ecc4b1c2d153d9ea9b656b5a3d35..c6451191d2de68607a9380482701d11f949d0ff7 100644
> --- a/include/linux/usb/chipidea.h
> +++ b/include/linux/usb/chipidea.h
> @@ -66,6 +66,7 @@ struct ci_hdrc_platform_data {
>  #define CI_HDRC_HAS_PORTSC_PEC_MISSED	BIT(17)
>  #define CI_HDRC_FORCE_VBUS_ACTIVE_ALWAYS	BIT(18)
>  #define	CI_HDRC_HAS_SHORT_PKT_LIMIT	BIT(19)
> +#define	CI_HDRC_OUT_BAND_WAKEUP		BIT(20)
>  	enum usb_dr_mode	dr_mode;
>  #define CI_HDRC_CONTROLLER_RESET_EVENT		0
>  #define CI_HDRC_CONTROLLER_STOPPED_EVENT	1
> 
> -- 
> 2.37.1
>