linux-kernel - Re: [PATCH 2/2] drm/i915: By default, enable RC6 on IVB and SNB when reasonable

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Message-ID: <20111213034558.GA26750@srcf.ucam.org>
Date:	Tue, 13 Dec 2011 03:45:58 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Keith Packard <keithp@...thp.com>
Cc:	intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org, Ted Phelps <phelps@...sto.com>,
	Peter <pab1612@...il.com>, Lukas Hejtmanek <xhejtman@...muni.cz>,
	Andrew Lutomirski <luto@....edu>
Subject: Re: [PATCH 2/2] drm/i915: By default, enable RC6 on IVB and SNB
 when reasonable

On Fri, Dec 09, 2011 at 03:53:49PM -0800, Keith Packard wrote:
> RC6 should always work on IVB, and should work on SNB whenever IO
> remapping is disabled. RC6 never works on Ironlake. Make the default
> value for the parameter follow these guidelines. Setting the value
> to either 0 or 1 will force the specified behavior.

I still don't like this. We're in a situation where we clearly have to 
disable one feature or the other on SNB - but we're disabling the one 
that's going to be useful to a large number of people, and leaving the 
niche feature enabled. If we're going to merge this then let's turn off 
iommu on SNB by default.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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