From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Fri, 21 Mar 2014 13:16:43 +0000 (+0000)
Subject: drm/i915: Include a note about the dangers of I915_READ64/I915_WRITE64
X-Git-Tag: v3.15-rc1~51^2~18^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=698b3135acb94e838a33a69f1a7a684fe0d90734;p=pandora-kernel.git

drm/i915: Include a note about the dangers of I915_READ64/I915_WRITE64

It is important that the user is fully aware that the seemingly atomic
read/write of a 64-bit value from MMIO space, may in fact be 2 separate
operations of 32-bits. This can lead to hilarity, such as

commit d18b9619034230b6f945e215276425636ca401fe
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Wed Jul 10 13:36:23 2013 +0100

    drm/i915: Fix incoherence with fence updates on Sandybridge+

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---

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