linux-kernel - Re: radeon: RFC speed cap detection on ppc64

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Message-ID: <20121022164444.2b0775ce@pyramind.ukuu.org.uk>
Date:	Mon, 22 Oct 2012 16:44:44 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Adam Jackson <ajax@...hat.com>
Cc:	Lucas Kannebley Tavares <lucaskt@...ux.vnet.ibm.com>,
	dri-devel@...ts.freedesktop.org,
	Benjamin Herrenschmidt <benh@....ibm.com>,
	linux-pci@...r.kernel.org,
	Nishanth Aravamudan <nacc@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org,
	Brian King <brking@...ux.vnet.ibm.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: radeon: RFC speed cap detection on ppc64

> That (walking all parent nodes) is probably the safest thing to do.  I'm 
> not sure whether it's optimal.  It would likely depend on whether you 
> can meaningfully have a bridge that's faster on the downstream side than 
> on the upstream.

This is architecture goo at heart - would this be better as a helper in
the PCI and arch PCI code ?

Alan
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