linux-kernel - Re: [PATCH] usb: dwc3: gadget:Core consumes a trb software to fill a trb, in ISO

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Date:   Fri, 22 Dec 2017 09:54:02 +0200
From:   Felipe Balbi <balbi@...nel.org>
To:     Lipengcheng <lpc.li@...ilicon.com>
Cc:     "linux-usb\@vger.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
        Lipengcheng <lpc.li@...ilicon.com>
Subject: Re: [PATCH] usb: dwc3: gadget:Core consumes a trb software to fill a trb, in ISO


Hi,

Lipengcheng <lpc.li@...ilicon.com> writes:

> Iso transmission, the current process is that all trb(HWO=1) is handled.
> Then core generate DWC3_DEPEVT_XFERNOTREADY event, Software begin  refill
> trb, this will produce 0 length package, the patch is to achieve the core
> consumes a trb, and then the software fill a trb. Normally, there will never
> be DWC3_DEPEVT_XFERNOTREADY event and 0-length packet.
>
> Signed-off-by: l00229106 <lpc.li@...ilicon.com>

who is 100229106??

> ---
>  drivers/usb/dwc3/gadget.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
> index 981fd98..1e6c42e 100644
> --- a/drivers/usb/dwc3/gadget.c
> +++ b/drivers/usb/dwc3/gadget.c
> @@ -2420,7 +2420,7 @@ static void dwc3_endpoint_transfer_complete(struct dwc3 *dwc,
>     if (!dep->endpoint.desc)
>         return;
>
> -   if (!usb_endpoint_xfer_isoc(dep->endpoint.desc))
> +   if (!usb_endpoint_xfer_isoc(dep->endpoint.desc) || (dep->flags & DWC3_EP_TRANSFER_STARTED))

this is wrong. isoc endpoints should NEVER be prestarted.

-- 
balbi