From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Thu, 12 May 2011 21:17:09 +0000 (+0100)
Subject: drm/i915: Cache GT fifo count for SandyBridge
X-Git-Tag: v3.1-rc1~230^2~18^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=95736720fc866eadb2ce1789631b907c0f38cb7c;p=pandora-kernel.git

drm/i915: Cache GT fifo count for SandyBridge

The read back of the available FIFO entries is vital for system
stability, but extremely costly. However, we only need a guide so as to
avoid eating into the reserved entries and since we are the only
consumer we can cache the read of the count from the last write.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Keith Packard <keithp@keithp.com>
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