Re: [PATCH v2 11/15] usb: dwc2: Add hibernation entering flow by system suspend

[Minas Harutyunyan]

On 4/16/2021 4:48 PM, Artur Petrosyan wrote:
> Adds a new flow of entering hibernation when PC is
> hibernated or suspended.
> 
> Signed-off-by: Artur Petrosyan <Arthur.Petrosyan@xxxxxxxxxxxx>

Acked-by: Minas Harutyunyan <Minas.Harutyunyan@xxxxxxxxxxxx>

> ---
>   Changes in v2:
>   - None
> 
>   drivers/usb/dwc2/hcd.c | 10 ++++++++++
>   1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
> index 093b1717df01..92848629cc61 100644
> --- a/drivers/usb/dwc2/hcd.c
> +++ b/drivers/usb/dwc2/hcd.c
> @@ -4387,6 +4387,16 @@ static int _dwc2_hcd_suspend(struct usb_hcd *hcd)
>   		clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
>   		break;
>   	case DWC2_POWER_DOWN_PARAM_HIBERNATION:
> +		/* Enter hibernation */
> +		spin_unlock_irqrestore(&hsotg->lock, flags);
> +		ret = dwc2_enter_hibernation(hsotg, 1);
> +		if (ret)
> +			dev_err(hsotg->dev, "enter hibernation failed\n");
> +		spin_lock_irqsave(&hsotg->lock, flags);
> +
> +		/* After entering suspend, hardware is not accessible */
> +		clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
> +		break;
>   	case DWC2_POWER_DOWN_PARAM_NONE:
>   		/*
>   		 * If not hibernation nor partial power down are supported,
>