linux-kernel - Re: [PATCH v4 7/9] usb: dwc3: Increase DWC3 controller halt timeout

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Date:   Tue, 23 Aug 2022 01:04:00 +0000
From:   Thinh Nguyen <Thinh.Nguyen@...opsys.com>
To:     Wesley Cheng <quic_wcheng@...cinc.com>
CC:     "balbi@...nel.org" <balbi@...nel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "quic_jackp@...cinc.com" <quic_jackp@...cinc.com>
Subject: Re: [PATCH v4 7/9] usb: dwc3: Increase DWC3 controller halt timeout

On Wed, Aug 17, 2022 at 11:23:57AM -0700, Wesley Cheng wrote:
> Since EP0 transactions need to be completed before the controller halt
> sequence is finished, this may take some time depending on the host and the
> enabled functions.  Increase the controller halt timeout, so that we give
> the controller sufficient time to handle EP0 transfers.
> 
> Signed-off-by: Wesley Cheng <quic_wcheng@...cinc.com>
> ---
>  drivers/usb/dwc3/gadget.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
> index 57d83b3b4967..5f250df7066f 100644
> --- a/drivers/usb/dwc3/gadget.c
> +++ b/drivers/usb/dwc3/gadget.c
> @@ -2444,7 +2444,7 @@ static void __dwc3_gadget_set_speed(struct dwc3 *dwc)
>  static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on, int suspend)
>  {
>  	u32			reg;
> -	u32			timeout = 500;
> +	u32			timeout = 2000;
>  
>  	if (pm_runtime_suspended(dwc->dev))
>  		return 0;
> @@ -2477,6 +2477,7 @@ static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on, int suspend)
>  	dwc3_gadget_dctl_write_safe(dwc, reg);
>  
>  	do {
> +		usleep_range(1000, 2000);
>  		reg = dwc3_readl(dwc->regs, DWC3_DSTS);
>  		reg &= DWC3_DSTS_DEVCTRLHLT;
>  	} while (--timeout && !(!is_on ^ !reg));

Reviewed-by: Thinh Nguyen <Thinh.Nguyen@...opsys.com>

Thanks,
Thinh