linux-kernel - Re: [PATCHv3 2/4] usb: gadget: replace "is_dualspeed" with "max

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Message-ID: <20110823172111.GD10996@legolas.emea.dhcp.ti.com>
Date:	Tue, 23 Aug 2011 20:21:12 +0300
From:	Felipe Balbi <balbi@...com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Felipe Balbi <balbi@...com>,
	Michal Nazarewicz <mnazarewicz@...gle.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Yang Rui Rui <ruirui.r.yang@...to.com>,
	Dave Young <hidave.darkstar@...il.com>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv3 2/4] usb: gadget: replace "is_dualspeed" with
 "max_speed"

Hi,

On Tue, Aug 23, 2011 at 11:43:44AM -0400, Alan Stern wrote:
> > if they are both part of the of the same configuration, full speed.
> > Otherwise Audio won't work. If they are part of different
> > configurations, then maximum_speed will be defined by the chosen config,
> > no ?
> 
> No.  The speed has to be chosen first, when the gadget connects to the 
> host.  The config isn't chosen until later, after the host retrieves 
> the various descriptors and decides among them.

true

> > I stand with the fact that if they are part of the same configuration,
> > there's no way around it, storage will have to come down to full speed.
> > Unless I'm missing something.
> 
> What if they are in different configurations?

then you use the fastest speed between both configurations?

-- 
balbi

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