linux-kernel - Re: usb: dwc3: gadget: Change runtime pm function for DWC3 runtime suspend

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Message-ID: <b7d4174f-e441-58a6-25ee-fb89dd78844f@gmail.com>
Date:   Mon, 15 Feb 2021 10:54:48 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...il.com>
To:     Daehwan Jung <dh10.jung@...sung.com>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: usb: dwc3: gadget: Change runtime pm function for DWC3 runtime
 suspend

Hello!

On 15.02.2021 5:38, Daehwan Jung wrote:

> It seems pm_runtime_put calls runtime_idle callback not runtime_suspend callback.
> It's better to use pm_runtime_put_sync_suspend to allow DWC3 runtime suspend.
> 
> Signed-off-by: Daehwan Jung <dh10.jung@...sung.com>
> ---
>   drivers/usb/dwc3/gadget.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
> index aebcf8e..4a4b93b 100644
> --- a/drivers/usb/dwc3/gadget.c
> +++ b/drivers/usb/dwc3/gadget.c
> @@ -2229,7 +2229,7 @@ static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
>   	 */
>   	ret = pm_runtime_get_sync(dwc->dev);
>   	if (!ret || ret < 0) {

    BTW, this can be shortened to (ret <= 0)...

> -		pm_runtime_put(dwc->dev);
> +		pm_runtime_put_sync_suspend(dwc->dev);
>   		return 0;
>   	}
>   

MBR, Sergei