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

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Message-ID: <87efaklcd1.fsf@linux.intel.com>
Date:   Fri, 14 Dec 2018 10:51:54 +0200
From:   Felipe Balbi <balbi@...nel.org>
To:     Zeng Tao <prime.zeng@...ilicon.com>
Cc:     liangshengjun@...ilicon.com, Zeng Tao <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

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 to make sure that it's not out of date.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

-- 
balbi

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