From: Ben Widawsky <ben@bwidawsk.net>
Date: Sun, 20 Mar 2011 01:14:28 +0000 (-0700)
Subject: drm/i915: fix rc6 initialization on Ironlake
X-Git-Tag: v3.0-rc1~312^2~4^2~34
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4a246cfc3c337ecb800d508ee5ed906534edb25c;p=pandora-kernel.git

drm/i915: fix rc6 initialization on Ironlake

There is a race condition between setting PWRCTXA and executing
MI_SET_CONTEXT. PWRCTXA must not be set until a valid context has been
written (or else the GPU could possible go into rc6, and return to an
invalid context).

Reported-and-Tested-by: Gu Rui <chaos.proton@gmail.com>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=28582
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Keith Packard <keithp@keithp.com>
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