linux-kernel - Re: [PATCH v2 10/15] usb: dwc2: Allow exit hibernation in urb enqueue

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Message-ID: <2ea0b9a6-1abc-6e91-1741-42ae7eacd305@synopsys.com>
Date:   Mon, 19 Apr 2021 07:31:28 +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 10/15] usb: dwc2: Allow exit hibernation in urb enqueue

On 4/16/2021 4:48 PM, Artur Petrosyan wrote:
> When core is in hibernation state and an external
> hub is connected, upper layer sends URB enqueue request,
> which results in port reset issue.
> 
> - Added exit from hibernation state to avoid port
> reset issue and process upper layer request properly.
> 
> Signed-off-by: Artur Petrosyan <Arthur.Petrosyan@...opsys.com>

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

> ---
>   Changes in v2:
>   - Moved duplicated error checking *if* conditions from innermost to outside if.
> 
>   drivers/usb/dwc2/hcd.c | 14 ++++++++++++++
>   1 file changed, 14 insertions(+)
> 
> diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
> index cc9ad6cf02d9..093b1717df01 100644
> --- a/drivers/usb/dwc2/hcd.c
> +++ b/drivers/usb/dwc2/hcd.c
> @@ -4631,12 +4631,26 @@ static int _dwc2_hcd_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
>   	struct dwc2_qh *qh;
>   	bool qh_allocated = false;
>   	struct dwc2_qtd *qtd;
> +	struct dwc2_gregs_backup *gr;
> +
> +	gr = &hsotg->gr_backup;
>   
>   	if (dbg_urb(urb)) {
>   		dev_vdbg(hsotg->dev, "DWC OTG HCD URB Enqueue\n");
>   		dwc2_dump_urb_info(hcd, urb, "urb_enqueue");
>   	}
>   
> +	if (hsotg->hibernated) {
> +		if (gr->gotgctl & GOTGCTL_CURMODE_HOST)
> +			retval = dwc2_exit_hibernation(hsotg, 0, 0, 1);
> +		else
> +			retval = dwc2_exit_hibernation(hsotg, 0, 0, 0);
> +
> +		if (retval)
> +			dev_err(hsotg->dev,
> +				"exit hibernation failed.\n");
> +	}
> +
>   	if (hsotg->in_ppd) {
>   		retval = dwc2_exit_partial_power_down(hsotg, 0, true);
>   		if (retval)
>