linux-kernel - Re: usb: dwc3: gadget: skip pullup and set

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Date:   Thu, 21 Jan 2021 01:00:32 +0000
From:   Thinh Nguyen <Thinh.Nguyen@...opsys.com>
To:     Daehwan Jung <dh10.jung@...sung.com>,
        Felipe Balbi <balbi@...nel.org>
CC:     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>
Subject: Re: usb: dwc3: gadget: skip pullup and set_speed after suspend

Hi,

Daehwan Jung wrote:
> Sometimes dwc3_gadget_pullup and dwc3_gadget_set_speed are called after
> entering suspend. That's why it needs to check whether suspend
>
> 1. dwc3 sends disconnect uevent and turn off. (suspend)
> 2. Platform side causes pullup or set_speed(e.g., adbd closes ffs node)
> 3. It causes unexpected behavior like ITMON error.
>
> Signed-off-by: Daehwan Jung <dh10.jung@...sung.com>
> ---
>  drivers/usb/dwc3/gadget.c | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
> index ee44321..d7d4202 100644
> --- a/drivers/usb/dwc3/gadget.c
> +++ b/drivers/usb/dwc3/gadget.c
> @@ -2093,6 +2093,9 @@ static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
>  	unsigned long		flags;
>  	int			ret;
>  
> +	if (pm_runtime_suspended(dwc->dev))
> +		return 0;
> +
>  	is_on = !!is_on;
>  
>  	/*
> @@ -2403,6 +2406,9 @@ static void dwc3_gadget_set_speed(struct usb_gadget *g,
>  	unsigned long		flags;
>  	u32			reg;
>  
> +	if (pm_runtime_suspended(dwc->dev))
> +		return;
> +
>  	spin_lock_irqsave(&dwc->lock, flags);
>  	reg = dwc3_readl(dwc->regs, DWC3_DCFG);
>  	reg &= ~(DWC3_DCFG_SPEED_MASK);

This is already addressed in Wesley Cheng's patches. Can you try the
latest changes of DWC3 in Greg's usb-next branch?

Thanks,
Thinh