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authorChris Wilson2014-03-21 14:16:43 +0100
committerDaniel Vetter2014-03-21 16:13:14 +0100
commit698b3135acb94e838a33a69f1a7a684fe0d90734 (patch)
treedc610c8c34825f722ac354393586c6ded3e55c45 /include/drm
parentdrm/i915/sdvo: fix questionable return value check (diff)
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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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