linux-kernel - Re: [PATCH v14 9/9] usb: Adding SuperSpeed support to dummy

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Date:	Tue, 31 May 2011 10:18:09 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Tatyana Brokhman <tlinder@...eaurora.org>
cc:	greg@...ah.com, <linux-usb@...r.kernel.org>,
	<linux-arm-msm@...r.kernel.org>, <balbi@...com>,
	<ablay@...eaurora.org>, open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v14 9/9] usb: Adding SuperSpeed support to dummy_hcd

On Tue, 31 May 2011, Tatyana Brokhman wrote:

> This patch adds SS support to the dummy hcd module. It may be used to test
> SS device when no (SS) HW is available.
> USB 3.0 hub includes 2 hubs - HS and SS ones.
> This patch adds support for a SS hub in the dummy_hcd module. Thus, when
> dummy_hcd enabled it will register 2 root hubs (SS and HS).
> A new module parameter was added to simulate a SuperSpeed connection.
> When a new device is connected it will enumerate via the HS root hub by
> default. In order to simulate SuperSpeed connection set the is_super_speed module
> parameter to true.

If is_super_speed is false, shouldn't you avoid registering the
SuperSpeed hub?  Or would that add too many complications?

> Signed-off-by: Tatyana Brokhman <tlinder@...eaurora.org>
> 
> ---
>  drivers/usb/gadget/Kconfig     |    1 +
>  drivers/usb/gadget/dummy_hcd.c |  556 +++++++++++++++++++++++++++++++++-------
>  2 files changed, 469 insertions(+), 88 deletions(-)
> 
> diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
> index 5927541..d5f0af7 100644
> --- a/drivers/usb/gadget/Kconfig
> +++ b/drivers/usb/gadget/Kconfig
> @@ -626,6 +626,7 @@ config USB_DUMMY_HCD
>  	depends on USB_GADGET_DUMMY_HCD
>  	default USB_GADGET
>  	select USB_GADGET_SELECTED
> +	select USB_GADGET_SUPERSPEED

This belongs under USB_GADGET_DUMMY_HCD, next to the "select
USB_GADGET_DUALSPEED" line.

Alan Stern

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