linux-kernel - RE: [PATCH] usb: dwc3: gadget: issue a stop command for ISOC endpoint

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Date:   Mon, 21 Jan 2019 08:51:26 +0000
From:   "Zengtao (B)" <prime.zeng@...ilicon.com>
To:     Felipe Balbi <felipe.balbi@...ux.intel.com>
CC:     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: issue a stop command for ISOC
 endpoint

Hi balbi:

>-----Original Message-----
>From: Felipe Balbi [mailto:felipe.balbi@...ux.intel.com]
>Sent: Monday, January 21, 2019 4:17 PM
>To: Zengtao (B) <prime.zeng@...ilicon.com>
>Cc: 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: issue a stop command for ISOC
>endpoint
>
>* PGP Signed by an unknown key
>
>
>Hi,
>
>Zeng Tao <prime.zeng@...ilicon.com> writes:
>> For ISOC transfers, if there is no available data for a period, we
>> need to stop the transfer by issue a stop command, otherwise, all the
>> upcoming transfers will started by update transfer command, and will
>> be dropped with MISS ISOC errors.
>
>We, actually, have code to handle missed isoc errors now. Have you tested
>with that applied? Which kernel are you using? Can you share tracepoints
>captured with v5.0-rc3?
>

Not v5.0-rc3, but I tested it based on 4.9 with backported dwc3 driver. And with
UVC application, it's very easy to reproduce it.

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