linux-kernel - Re: [PATCH] usb: musb: core: Disable the Interrupts till BABBLE is fully handled

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Message-ID: <20141114210232.GC16388@saruman>
Date:	Fri, 14 Nov 2014 15:02:32 -0600
From:	Felipe Balbi <balbi@...com>
To:	George Cherian <george.cherian@...com>
CC:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>, <balbi@...com>,
	<gregkh@...uxfoundation.org>, <linux-usb@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb: musb: core: Disable the Interrupts till BABBLE is
 fully handled

On Fri, Nov 14, 2014 at 02:41:57PM +0530, George Cherian wrote:
> 
> On 11/14/2014 02:12 PM, Sebastian Andrzej Siewior wrote:
> >On 11/14/2014 09:24 AM, George Cherian wrote:
> >>Disable the MUSB interrupts till MUSB is recovered fully from BABBLE
> >>condition. There are chances that we could get multiple interrupts
> >>till the time the babble recover work gets scheduled. Sometimes
> >>this could even end up in an endless loop making MUSB itself unusable.
> >How do you trigger the babble error? Is this something that happens
> >during suspend resume, plugging / unplugging a device or randomly while
> >the device is used?
> I have never seen this error while device is successfully enumerated and
> while working fine.
> Mostly u get it when we connect/disconnect devices to HOST port.
> Normally I use the following for testing BABBLE
>  - Especially when a fully loaded USB HUB getting connected to HOST port.
>  - Or repeatedly load and unload musb_hdrc.ko with some device connected.
> 
> If nothing of the above work you might be the lucky one to have a good
> board!!!!

if you have a BBB, connect host port to device port, load g_zero and run
any of testusb test cases.

-- 
balbi

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