From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Fri, 29 Oct 2010 20:44:37 +0000 (+0100)
Subject: drm/i915/ringbuffer: Use the HEAD auto-reporting mechanism
X-Git-Tag: v2.6.38-rc1~419^2~23^2~141
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6aa56062eaba67adfb247cded244fd877329588d;p=pandora-kernel.git

drm/i915/ringbuffer: Use the HEAD auto-reporting mechanism

My Sandybridge only reports 0 for the ring buffer registers, causing it
to hang as soon as we exhaust the available ring. As a workaround, take
advantage of our huge ring buffers and use the auto-reporting mechanism
to update the status page with the HEAD location every 64 KiB.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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