[Intel-gfx] [PATCH] Correct alignment for framebuffer

[Chris Wilson]

Hello all,

intel_pipe_set_base() sets an invalid alignment for I915_TILING_X on an
i915, triggering the warning "i915_write_fence_reg: object 0x00a00000
not 1M or size (0x400000) aligned".

The attached patch uses i915_gem_get_gtt_alignment() to compute the
correct alignment for a fenced object.

Thanks.
-ickle
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