linux-kernel - Re: [PATCH 4/4] usb: dwc3: imx8mp: disable SS

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Message-ID: <20240807012038.vgf6thnjofvvxbyj@synopsys.com>
Date: Wed, 7 Aug 2024 01:20:43 +0000
From: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
To: Frank Li <Frank.Li@....com>
CC: Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "imx@...ts.linux.dev" <imx@...ts.linux.dev>,
        "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>,
        "jun.li@....com" <jun.li@....com>, Xu Yang <xu.yang_2@....com>
Subject: Re: [PATCH 4/4] usb: dwc3: imx8mp: disable SS_CON and U3 wakeup for
 system sleep

On Fri, Jul 12, 2024, Frank Li wrote:
> From: Li Jun <jun.li@....com>
> 
> SS_CON and U3 wakeup need 'ref_clk' on. iMX8MP turn off it while system
> sleep, So disable these wakeup source and only enable DP/DM wakeup source
> for host mode.
> 
> Reviewed-by: Xu Yang <xu.yang_2@....com>
> Signed-off-by: Li Jun <jun.li@....com>
> Signed-off-by: Frank Li <Frank.Li@....com>
> ---
>  drivers/usb/dwc3/dwc3-imx8mp.c | 15 +++++++++------
>  1 file changed, 9 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/usb/dwc3/dwc3-imx8mp.c b/drivers/usb/dwc3/dwc3-imx8mp.c
> index 5794bb75f7604..9f8c34d09a8e9 100644
> --- a/drivers/usb/dwc3/dwc3-imx8mp.c
> +++ b/drivers/usb/dwc3/dwc3-imx8mp.c
> @@ -96,7 +96,8 @@ static void imx8mp_configure_glue(struct dwc3_imx8mp *dwc3_imx)
>  	writel(value, dwc3_imx->glue_base + USB_CTRL1);
>  }
>  
> -static void dwc3_imx8mp_wakeup_enable(struct dwc3_imx8mp *dwc3_imx)
> +static void dwc3_imx8mp_wakeup_enable(struct dwc3_imx8mp *dwc3_imx,
> +				      pm_message_t msg)
>  {
>  	struct dwc3	*dwc3 = platform_get_drvdata(dwc3_imx->dwc3);
>  	u32		val;
> @@ -106,12 +107,14 @@ static void dwc3_imx8mp_wakeup_enable(struct dwc3_imx8mp *dwc3_imx)
>  
>  	val = readl(dwc3_imx->hsio_blk_base + USB_WAKEUP_CTRL);
>  
> -	if ((dwc3->current_dr_role == DWC3_GCTL_PRTCAP_HOST) && dwc3->xhci)
> -		val |= USB_WAKEUP_EN | USB_WAKEUP_SS_CONN |
> -		       USB_WAKEUP_U3_EN | USB_WAKEUP_DPDM_EN;
> -	else if (dwc3->current_dr_role == DWC3_GCTL_PRTCAP_DEVICE)
> +	if ((dwc3->current_dr_role == DWC3_GCTL_PRTCAP_HOST) && dwc3->xhci) {
> +		val |= USB_WAKEUP_EN | USB_WAKEUP_DPDM_EN;
> +		if (PMSG_IS_AUTO(msg))
> +			val |= USB_WAKEUP_SS_CONN | USB_WAKEUP_U3_EN;
> +	} else {
>  		val |= USB_WAKEUP_EN | USB_WAKEUP_VBUS_EN |
>  		       USB_WAKEUP_VBUS_SRC_SESS_VAL;
> +	}
>  
>  	writel(val, dwc3_imx->hsio_blk_base + USB_WAKEUP_CTRL);
>  }
> @@ -308,7 +311,7 @@ static int __maybe_unused dwc3_imx8mp_suspend(struct dwc3_imx8mp *dwc3_imx,
>  
>  	/* Wakeup enable */
>  	if (PMSG_IS_AUTO(msg) || device_may_wakeup(dwc3_imx->dev))
> -		dwc3_imx8mp_wakeup_enable(dwc3_imx);
> +		dwc3_imx8mp_wakeup_enable(dwc3_imx, msg);
>  
>  	dwc3_imx->pm_suspended = true;
>  
> 
> -- 
> 2.34.1
> 

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

Thanks,
Thinh