linux-kernel - Re: [PATCH v12 7/8] usb: Adding SuperSpeed support to dummy

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Message-ID: <20110525094902.GM14556@legolas.emea.dhcp.ti.com>
Date:	Wed, 25 May 2011 12:49:03 +0300
From:	Felipe Balbi <balbi@...com>
To:	Tanya Brokhman <tlinder@...eaurora.org>
Cc:	balbi@...com, 'Alan Stern' <stern@...land.harvard.edu>,
	'Sarah Sharp' <sarah.a.sharp@...ux.intel.com>, greg@...ah.com,
	linux-usb@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	ablay@...eaurora.org, 'open list' <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v12 7/8] usb: Adding SuperSpeed support to dummy_hcd

Hi,

On Wed, May 25, 2011 at 12:43:10PM +0300, Tanya Brokhman wrote:
> > > But that's why we added the feature flag. Isn't leaving it FALSE the
> > > same as removing the part that updates gadget speed? It is protected
> > with #ifdef.
> > 
> > you mean the module parameter ? This will mean that users will have to
> > remember another module parameter otherwise it will not work in some
> > situations :-)
> > 
> > the module should work without that parameter :-)
> > 
> 
> No, I'm afraid we're talking about different things here. 
> As far as dummy_hcd is concerned:
> Dummy_hcd has a new module parameter that should be set to true if the
> developer wishes the gadget driver to be connected to a SS root hub. Since
> at the moment most of the gadget drivers woun't work at SS connection (lack
> of SS descriptors) the default of this parameter is true and thus the
> connected gadget driver will be enumerated over a HS root hub. Users don't
> have to remember t set anything in order to be able to work with dummy_hcd
> and the existing gadget drivers just as they did up until now.
> 
> We did add a new feature flag (CONFIG_USB_GADGET_SUPERSPEED) that is set
> during compilation. If that flag is defined, then (and only then!) will the
> driver->speed be set to SS by composite_bind. Please keep in mind the

and that's the only thing I'm asking you to remove :-)

we should be to compile dummy_hcd in SuperSpeed and still have
high-speed gadget drivers :-)

> following:
> 1. if CONFIG_USB_GADGET_SUPERSPEED=true, existing gadget drivers are still
> functional with dummy_hcd since as I already mentioned, they will be
> enumerated through HS root hub and thus the gadget.speed will be set to HS.
> This is true for all gadget drivers, including the once that don't define SS
> descriptors.

only due the module parameter, right ?

-- 
balbi

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