linux-kernel - Re: [PATCH 1/5 v8] usb: Adding SuperSpeed support to dummy

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Message-ID: <20110328084157.GH2251@legolas.emea.dhcp.ti.com>
Date:	Mon, 28 Mar 2011 11:41:59 +0300
From:	Felipe Balbi <balbi@...com>
To:	Tanya Brokhman <tlinder@...eaurora.org>
Cc:	balbi@...com, gregkh@...e.de, linux-arm-msm@...r.kernel.org,
	ablay@...eaurora.org,
	"'open list:USB GADGET/PERIPH...'" <linux-usb@...r.kernel.org>,
	'open list' <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/5 v8] usb: Adding SuperSpeed support to dummy_hcd

On Sun, Mar 27, 2011 at 02:19:25PM +0200, Tanya Brokhman wrote:
> Hi
> 
> > >
> > >  MODULE_DESCRIPTION (DRIVER_DESC);
> > >  MODULE_AUTHOR ("David Brownell");
> > > @@ -220,6 +223,7 @@ static inline struct dummy *gadget_dev_to_dummy
> > (struct device *dev)
> > >  }
> > >
> > >  static struct dummy			*the_controller;
> > > +static struct dummy			*the_ss_controller;
> > 
> > the only thing I don't like, is why you splitted the ss controller to a
> > separate controller. Why don't you use the same ? From SW perspective,
> > we can treat SS and HS/FS/LS controllers as one unit.
> > 
> 
> Actually I'm not sure about that... Because SS controller handles things a
> bit differently than HS/FS/LS. For example look at set_ss_link_state(), the
> port status is reported differently than for HS/FS/LS devices.
> It could be done, I mean spare the the_ss_controller variable and use
> the_controller, and we did that at first, but later on we decided to go back
> to this implementation since the code got too complex. Since dummy_hcd.c is
> used for debugging purposes we decided that simplicity is the better
> approach here.

you can have two different functions and decide which one to call by
checking gadget->speed.

-- 
balbi
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