linux-kernel - Re: [PATCH 0/3] Tegra USB probe order issue fix

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Message-ID: <Pine.LNX.4.44L0.1407021001290.874-100000@iolanthe.rowland.org>
Date:	Wed, 2 Jul 2014 10:02:32 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Tuomas Tynkkynen <ttynkkynen@...dia.com>
cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Felipe Balbi <balbi@...com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	<linux-usb@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <tuomas.tynkkynen@....fi>
Subject: Re: [PATCH 0/3] Tegra USB probe order issue fix

On Wed, 2 Jul 2014, Tuomas Tynkkynen wrote:

> Hi all,
> 
> This series fixes a probe order issue with the Tegra EHCI driver.
> Basically, the register area of the 1st USB controller contains some
> registers that are global to all of the controllers, but that are also
> cleared when reset is asserted to the 1st controller. So if (say) the
> 3rd controller would be the first one to finish probing successfully,
> then the reset that happens during the 1st controller's probe would
> result in broken USB. So the before doing anything with the USB HW,
> we should reset the 1st controller once, and then never ever reset
> it again.

This sounds very much like the sort of thing that ought to be described 
in DT.  It is a hardware dependence, and DT exists for the purpose of 
describing the hardware.

Alan Stern

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