[PATCH 1/5] drm/i915/ttm: Add I915_BO_PREALLOC

[Andi Shyti]

> Add a mechanism to preserve existing data when creating a TTM
> object with the I915_BO_ALLOC_USER flag. This will be used in the subsequent
> patch where the I915_BO_ALLOC_USER flag will be applied to the framebuffer
> object. For a pre-allocated framebuffer without the I915_BO_PREALLOC flag,
> TTM would clear the content, which is not desirable.

ack!

Andi