Re: [PATCH] drm/i915: By default, enable RC6 on IVB and SNB whenreasonable

[David Woodhouse]

On Wed, 2011-11-23 at 16:41 +0100, Daniel Vetter wrote:
> Hm, that comment confuses me a bit. I've always thought that igfx_off only
> instantiates a identity mapping and leaves the dmar unit on. Is that
> wrong? 

It's completely off. If a DMAR unit has *only* graphics devices behind
it (as the one for the built-in graphics does, because it's a whole
boatload of speshul case for integration with the GTT), we just don't
enable it at all. See the second for_each_drhd_unit() loop in
init_no_remapping_devices().

-- 
dwmw2

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