linux-kernel - Re: [PATCH v2 09/15] usb: dwc2: Move exit hibernation to dwc2_port

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Date:   Mon, 19 Apr 2021 07:31:16 +0000
From:   Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>
To:     Artur Petrosyan <Arthur.Petrosyan@...opsys.com>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     John Youn <John.Youn@...opsys.com>
Subject: Re: [PATCH v2 09/15] usb: dwc2: Move exit hibernation to
 dwc2_port_resume() function

On 4/16/2021 4:47 PM, Artur Petrosyan wrote:
> This move is done to call hibernation exit handler in
> "dwc2_port_resume()" function when core receives port resume.
> Otherwise it could be confusing to exit hibernation in
> "dwc2_hcd_hub_control()" function but other power saving modes
> in "dwc2_port_resume()" function.
> 
> Signed-off-by: Artur Petrosyan <Arthur.Petrosyan@...opsys.com>

Acked-by: Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>

> ---
>   Changes in v2:
>   - None
> 
>   drivers/usb/dwc2/hcd.c | 13 +++++++------
>   1 file changed, 7 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
> index 43a2298b7d42..cc9ad6cf02d9 100644
> --- a/drivers/usb/dwc2/hcd.c
> +++ b/drivers/usb/dwc2/hcd.c
> @@ -3383,6 +3383,11 @@ int dwc2_port_resume(struct dwc2_hsotg *hsotg)
>   				"exit partial_power_down failed.\n");
>   		break;
>   	case DWC2_POWER_DOWN_PARAM_HIBERNATION:
> +		/* Exit host hibernation. */
> +		ret = dwc2_exit_hibernation(hsotg, 0, 0, 1);
> +		if (ret)
> +			dev_err(hsotg->dev, "exit hibernation failed.\n");
> +		break;
>   	case DWC2_POWER_DOWN_PARAM_NONE:
>   		/*
>   		 * If not hibernation nor partial power down are supported,
> @@ -3446,12 +3451,8 @@ static int dwc2_hcd_hub_control(struct dwc2_hsotg *hsotg, u16 typereq,
>   			dev_dbg(hsotg->dev,
>   				"ClearPortFeature USB_PORT_FEAT_SUSPEND\n");
>   
> -			if (hsotg->bus_suspended) {
> -				if (hsotg->hibernated)
> -					dwc2_exit_hibernation(hsotg, 0, 0, 1);
> -				else
> -					dwc2_port_resume(hsotg);
> -			}
> +			if (hsotg->bus_suspended)
> +				retval = dwc2_port_resume(hsotg);
>   			break;
>   
>   		case USB_PORT_FEAT_POWER:
>