[Intel-gfx] [patch] [drm/i915] Fix up ring initialization to cover G45 oddities

[Eric Anholt]

On Tue, 2008-10-14 at 17:20 -0700, Keith Packard wrote:
> From a84c80858b22b538e3e049b99bd9e2768e32e2b3 Mon Sep 17 00:00:00 2001
> From: Keith Packard <keithp at keithp.com>
> Date: Tue, 14 Oct 2008 17:07:58 -0700
> Subject: [PATCH] [drm/i915] Fix up ring initialization to cover G45 oddities
> 
> G45 appears quite sensitive to ring initialization register writes,
> sometimes leaving the HEAD register with the START register contents. Check
> to make sure HEAD is reset correctly when START is written, and fix it up,
> screaming loudly.

I'm not entirely sold on this patch (why do we have to do this, are we
botching the ring setup somehow?), but it shouldn't hurt, so I pushed.

-- 
Eric Anholt
eric at anholt.net                         eric.anholt at intel.com


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