linux-kernel - Re: [PATCH V1 1/1] usb/host: Let usb phy shutdown later

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Message-ID: <610871b2-1707-dfba-868f-4ddecc4d554d@linux.intel.com>
Date:   Tue, 19 Apr 2022 17:45:49 +0300
From:   Mathias Nyman <mathias.nyman@...ux.intel.com>
To:     Surong Pang <surong.pang@...il.com>, mathias.nyman@...el.com,
        gregkh@...uxfoundation.org
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V1 1/1] usb/host: Let usb phy shutdown later

On 12.4.2022 15.25, Surong Pang wrote:
> From: Surong Pang <surong.pang@...soc.com>
> 
> Let usb phy shutdown later in xhci_plat_remove function.
> Some phy driver doesn't divide 3.0/2.0 very clear.
> If calls usb_phy_shutdown earlier than usb_remove_hcd(hcd),
> It will case 10s cmd timeout issue.
> 
> Call usb phy shutdown later has better compatibility.
> 
> Signed-off-by: Surong Pang <surong.pang@...soc.com>
> ---
>  drivers/usb/host/xhci-plat.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
> index 649ffd861b44..dc73a81cbe9b 100644
> --- a/drivers/usb/host/xhci-plat.c
> +++ b/drivers/usb/host/xhci-plat.c
> @@ -390,7 +390,6 @@ static int xhci_plat_remove(struct platform_device *dev)
>  
>  	usb_remove_hcd(shared_hcd);
>  	xhci->shared_hcd = NULL;
> -	usb_phy_shutdown(hcd->usb_phy);
>  
>  	usb_remove_hcd(hcd);
>  	usb_put_hcd(shared_hcd);
> @@ -398,6 +397,7 @@ static int xhci_plat_remove(struct platform_device *dev)
>  	clk_disable_unprepare(clk);
>  	clk_disable_unprepare(reg_clk);
>  	usb_put_hcd(hcd);
> +	usb_phy_shutdown(hcd->usb_phy);

hcd might be freed already here.
maybe call usb_phy_shutdown(hcd->usb_phy) before usb_put_hcd(hcd)

-Mathias