linux-kernel - Re: [PATCH] usb: dwc2: fix transfer stop programming for out endpoint

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Date:	Wed, 16 Dec 2015 10:57:59 -0600
From:	Felipe Balbi <balbi@...com>
To:	<changbin.du@...el.com>, <johnyoun@...opsys.com>
CC:	<gregkh@...uxfoundation.org>, <linux-usb@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	"Du, Changbin" <changbin.du@...el.com>
Subject: Re: [PATCH] usb: dwc2: fix transfer stop programming for out endpoint


Hi,

changbin.du@...el.com writes:
> From: "Du, Changbin" <changbin.du@...el.com>
>
> To stop an out endpoint, software should set sets the Global OUT NAK,
> but not the Global Non-periodic IN NAK. This driver bug leads the out-ep
> failed be in disabled state with below error.
>
> dwc2_hsotg_ep_stop_xfr: timeout DOEPCTL.EPDisable
>
> Signed-off-by: Du, Changbin <changbin.du@...el.com>

John, is this patch okay to apply ?

> ---
>  drivers/usb/dwc2/gadget.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
> index 0abf73c..92a182f 100644
> --- a/drivers/usb/dwc2/gadget.c
> +++ b/drivers/usb/dwc2/gadget.c
> @@ -2911,15 +2911,15 @@ static void dwc2_hsotg_ep_stop_xfr(struct dwc2_hsotg *hsotg,
>  				"%s: timeout DIEPINT.NAKEFF\n", __func__);
>  	} else {
>  		/* Clear any pending nak effect interrupt */
> -		dwc2_writel(GINTSTS_GINNAKEFF, hsotg->regs + GINTSTS);
> +		dwc2_writel(GINTSTS_GOUTNAKEFF, hsotg->regs + GINTSTS);
>  
> -		__orr32(hsotg->regs + DCTL, DCTL_SGNPINNAK);
> +		__orr32(hsotg->regs + DCTL, DCTL_SGOUTNAK);
>  
>  		/* Wait for global nak to take effect */
>  		if (dwc2_hsotg_wait_bit_set(hsotg, GINTSTS,
> -						GINTSTS_GINNAKEFF, 100))
> +						GINTSTS_GOUTNAKEFF, 100))
>  			dev_warn(hsotg->dev,
> -				"%s: timeout GINTSTS.GINNAKEFF\n", __func__);
> +				"%s: timeout GINTSTS.GOUTNAKEFF\n", __func__);
>  	}
>  
>  	/* Disable ep */
> @@ -2944,7 +2944,7 @@ static void dwc2_hsotg_ep_stop_xfr(struct dwc2_hsotg *hsotg,
>  		/* TODO: Flush shared tx fifo */
>  	} else {
>  		/* Remove global NAKs */
> -		__bic32(hsotg->regs + DCTL, DCTL_SGNPINNAK);
> +		__bic32(hsotg->regs + DCTL, DCTL_SGOUTNAK);
>  	}
>  }
>  
> -- 
> 2.5.0
>

-- 
balbi

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