linux-kernel - RE: [PATCH v4 6/6] usb:cdns3 Fix for stuck packets in on-chip OUT buffer.

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Date:   Thu, 21 Feb 2019 09:14:30 +0200
From:   Felipe Balbi <felipe.balbi@...ux.intel.com>
To:     Pawel Laszczak <pawell@...ence.com>, Roger Quadros <rogerq@...com>,
        "devicetree\@vger.kernel.org" <devicetree@...r.kernel.org>
Cc:     "gregkh\@linuxfoundation.org" <gregkh@...uxfoundation.org>,
        "mark.rutland\@arm.com" <mark.rutland@....com>,
        "linux-usb\@vger.kernel.org" <linux-usb@...r.kernel.org>,
        "hdegoede\@redhat.com" <hdegoede@...hat.com>,
        "heikki.krogerus\@linux.intel.com" <heikki.krogerus@...ux.intel.com>,
        "andy.shevchenko\@gmail.com" <andy.shevchenko@...il.com>,
        "robh+dt\@kernel.org" <robh+dt@...nel.org>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
        "jbergsagel\@ti.com" <jbergsagel@...com>,
        "nsekhar\@ti.com" <nsekhar@...com>, "nm\@ti.com" <nm@...com>,
        Suresh Punnoose <sureshp@...ence.com>,
        "peter.chen\@nxp.com" <peter.chen@....com>,
        Rahul Kumar <kurahul@...ence.com>
Subject: RE: [PATCH v4 6/6] usb:cdns3 Fix for stuck packets in on-chip OUT buffer.


Hi,

(please break your emails at 80-columns)

Pawel Laszczak <pawell@...ence.com> writes:
>>> One more thing. Workaround has implemented algorithm that decide for which
>>> endpoint it should be enabled.  e.g for composite device MSC+NCM+ACM it
>>> should work only for ACM OUT endpoint.
>>>
>>
>>If ACM driver didn't queue the request for ACM OUT endpoint, why does the
>>controller accept the data at all?
>>
>>I didn't understand why we need a workaround for this. It should be standard
>>behaviour to NAK data if function driver didn't request for all endpoints.
>
> Yes, I agree with you. Controller shouldn’t accept such packet. As I know this
> behavior will be fixed in RTL.
>
> But I assume that some older version of this controller are one the market,
> and driver should work correct with them.
>
> In the feature this workaround can be limited only to selected controllers.
>
> Even now I assume that it can be enabled/disabled by module parameter.

no module parameters, please. Use revision detection in runtime.

-- 
balbi

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