linux-kernel - Re: [PATCH v10 1/6] usb: host: xhci: plat: Add suspend quirk for dwc3 controller

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Date:   Wed, 26 Jan 2022 13:47:38 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Sandeep Maheswaram <quic_c_sanm@...cinc.com>
Cc:     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>,
        linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, quic_pkondeti@...cinc.com,
        quic_ppratap@...cinc.com
Subject: Re: [PATCH v10 1/6] usb: host: xhci: plat: Add suspend quirk for
 dwc3 controller

On Mon, Jan 17, 2022 at 11:14:03AM +0530, Sandeep Maheswaram wrote:
> During suspend check if any wakeup capable devices are connected to the
> controller (directly or through hubs), and set the wakeup enable property
> for xhci plat device.
> 
> Signed-off-by: Sandeep Maheswaram <quic_c_sanm@...cinc.com>
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---
> Change device_set_wakeup_capable to device_set_wakeup_enable as 
> wakeup capable false was deleting the sysfs property.
> 
>  drivers/usb/host/xhci-plat.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
> index c1edcc9..1c8fadb 100644
> --- a/drivers/usb/host/xhci-plat.c
> +++ b/drivers/usb/host/xhci-plat.c
> @@ -431,6 +431,14 @@ static int xhci_plat_remove(struct platform_device *dev)
>  	return 0;
>  }
>  
> +static void xhci_dwc3_suspend_quirk(struct usb_hcd *hcd, struct device *dev)
> +{
> +	if (usb_wakeup_enabled_descendants(hcd->self.root_hub))
> +		device_set_wakeup_enable(dev, true);
> +	else
> +		device_set_wakeup_enable(dev, false);
> +}
> +
>  static int __maybe_unused xhci_plat_suspend(struct device *dev)
>  {
>  	struct usb_hcd	*hcd = dev_get_drvdata(dev);
> @@ -440,6 +448,10 @@ static int __maybe_unused xhci_plat_suspend(struct device *dev)
>  	ret = xhci_priv_suspend_quirk(hcd);
>  	if (ret)
>  		return ret;
> +
> +	if (of_device_is_compatible(dev->parent->of_node, "snps,dwc3"))
> +		xhci_dwc3_suspend_quirk(hcd, dev);

I still think that checking for this type of thing needs to be in the
platform specific driver, not in the generic one.

thanks,

greg k-h