linux-kernel - Re: [PATCH v2] usb: xhci-plat: fix usb disconnect issue after s4

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Date:   Thu, 21 Sep 2023 09:58:42 +0800
From:   Yinbo Zhu <zhuyinbo@...ngson.cn>
To:     Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Jianmin Lv <lvjianmin@...ngson.cn>, wanghongliang@...ngson.cn,
        loongson-kernel@...ts.loongnix.cn, zhuyinbo@...ngson.cn
Subject: Re: [PATCH v2] usb: xhci-plat: fix usb disconnect issue after s4



Friendly ping ?


在 2023/8/9 下午5:58, Yinbo Zhu 写道:
> The xhci retaining bogus hardware states cause usb disconnect devices
> connected before hibernation(s4) and refer to the commit 'f3d478858be
> ("usb: ohci-platform: fix usb disconnect issue after s4")' which set
> flag "hibernated" as true when resume-from-hibernation and that the
> drivers will reset the hardware to get rid of any existing state and
> make sure resume from hibernation re-enumerates everything for xhci.
> 
> Signed-off-by: Yinbo Zhu <zhuyinbo@...ngson.cn>
> ---
> Change in v2:
> 		1. Add CONFIG_PM_SLEEP in xhci_plat_pm_ops that for fix
> 		   compile issue when CONFIG_PM not enable.
> 
>   drivers/usb/host/xhci-plat.c | 24 ++++++++++++++++++++----
>   1 file changed, 20 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
> index 28218c8f1837..112468fdcca2 100644
> --- a/drivers/usb/host/xhci-plat.c
> +++ b/drivers/usb/host/xhci-plat.c
> @@ -451,7 +451,7 @@ static int __maybe_unused xhci_plat_suspend(struct device *dev)
>   	return 0;
>   }
>   
> -static int __maybe_unused xhci_plat_resume(struct device *dev)
> +static int __maybe_unused xhci_plat_resume_common(struct device *dev, struct pm_message pmsg)
>   {
>   	struct usb_hcd	*hcd = dev_get_drvdata(dev);
>   	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
> @@ -466,7 +466,7 @@ static int __maybe_unused xhci_plat_resume(struct device *dev)
>   	if (ret)
>   		return ret;
>   
> -	ret = xhci_resume(xhci, PMSG_RESUME);
> +	ret = xhci_resume(xhci, pmsg);
>   	if (ret)
>   		return ret;
>   
> @@ -477,6 +477,16 @@ static int __maybe_unused xhci_plat_resume(struct device *dev)
>   	return 0;
>   }
>   
> +static int __maybe_unused xhci_plat_resume(struct device *dev)
> +{
> +	return xhci_plat_resume_common(dev, PMSG_RESUME);
> +}
> +
> +static int __maybe_unused xhci_plat_restore(struct device *dev)
> +{
> +	return xhci_plat_resume_common(dev, PMSG_RESTORE);
> +}
> +
>   static int __maybe_unused xhci_plat_runtime_suspend(struct device *dev)
>   {
>   	struct usb_hcd  *hcd = dev_get_drvdata(dev);
> @@ -499,8 +509,14 @@ static int __maybe_unused xhci_plat_runtime_resume(struct device *dev)
>   }
>   
>   const struct dev_pm_ops xhci_plat_pm_ops = {
> -	SET_SYSTEM_SLEEP_PM_OPS(xhci_plat_suspend, xhci_plat_resume)
> -
> +#ifdef CONFIG_PM_SLEEP
> +	.suspend = xhci_plat_suspend,
> +	.resume = xhci_plat_resume,
> +	.freeze = xhci_plat_suspend,
> +	.thaw = xhci_plat_resume,
> +	.poweroff = xhci_plat_suspend,
> +	.restore = xhci_plat_restore,
> +#endif
>   	SET_RUNTIME_PM_OPS(xhci_plat_runtime_suspend,
>   			   xhci_plat_runtime_resume,
>   			   NULL)
>