linux-kernel - RE: [PATCH] usb: dwc3: gadget: fix miss isoc issue introduced by IRQ latency

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Message-ID: <678F3D1BB717D949B966B68EAEB446ED24E20BE5@dggemm526-mbx.china.huawei.com>
Date:   Fri, 14 Dec 2018 09:11:52 +0000
From:   "Zengtao (B)" <prime.zeng@...ilicon.com>
To:     Felipe Balbi <balbi@...nel.org>
CC:     liangshengjun <liangshengjun@...ilicon.com>,
        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: [PATCH] usb: dwc3: gadget: fix miss isoc issue introduced by
 IRQ latency

>-----Original Message-----
>From: Felipe Balbi [mailto:balbi@...nel.org]
>Sent: Friday, December 14, 2018 4:52 PM
>To: Zengtao (B) <prime.zeng@...ilicon.com>
>Cc: liangshengjun <liangshengjun@...ilicon.com>; Zengtao (B)
><prime.zeng@...ilicon.com>; Greg Kroah-Hartman
><gregkh@...uxfoundation.org>; linux-usb@...r.kernel.org;
>linux-kernel@...r.kernel.org
>Subject: Re: [PATCH] usb: dwc3: gadget: fix miss isoc issue introduced by
>IRQ latency
>
>* PGP Signed by an unknown key
>
>Zeng Tao <prime.zeng@...ilicon.com> writes:
>
>> If it's a busy system, some times when we start an isoc transfer, the
>> framenumber get from the event buffer may be already elasped, in this
>> case, we will get all the packets dropped due to miss isoc. And we
>> turn into transfer nothing, to fix this issue, we need to fix the
>> framenumber to make sure that it's not out of date.
>>
>> Signed-off-by: Liang Shengjun <liangshengjun@...ilicon.com>
>> Signed-off-by: Zeng Tao <prime.zeng@...ilicon.com>
>
>There's a patch going upstream already doing this:
>
>https://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb.git/commit/?h
>=next&id=d53701067f048b8b11635e964b6d3bd9a248c622
>

Sorry, I think I missed to update to the latest version. But I think my 
patch is more efficient. Because I just sync the frame from the HW, it
 won't fail and there is no need to extra tries.

What do you think about it?

Regards
Zengtao
>--
>balbi
>
>* Unknown Key
>* 0xE11A9906