linux-kernel - Re: Resetting USB HC .. During kernel boot

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Message-ID: <Pine.LNX.4.44L0.1009021022270.1513-100000@iolanthe.rowland.org>
Date:	Thu, 2 Sep 2010 10:26:44 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Prabhu Chawandi <prabhu.chavandi@...il.com>
cc:	linux-kernel@...r.kernel.org, <linux-usb@...r.kernel.org>,
	<listar@...linux.org>
Subject: Re: Resetting USB HC .. During kernel boot

On Thu, 2 Sep 2010, Prabhu Chawandi wrote:

> Hi All,
> 
>    I want to reset the USB HC  while the booting is happening. I have
> the register details and functionality with me, but not sure which
> part of the code to insert this segment.
> 
> please advice me ...

Why do you want to do this?

Anyway, it depends on what type of host controller you're talking 
about.  UHCI controllers are already reset during boot.  The same is 
true for PCI-based EHCI and OHCI controllers (except on certain PA-RISC 
systems).

I haven't checked the various non-PCI controllers.

Alan Stern

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