drm/i915: clarify gen2 pageflip cmd
I've reviewed gen2 pageflip code to hunt down multiple prepare pageflip issues. The only thing I've found is a slight but functionally meaningless confusion about the length of the mi cmd. Fix it up and add a comment about what this dword should be (according to docs at least). Reviewed-by: Eric Anholt <eric@anholt.net> Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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@ -7288,7 +7288,7 @@ static int intel_gen2_queue_flip(struct drm_device *dev,
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MI_DISPLAY_FLIP_PLANE(intel_crtc->plane));
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OUT_RING(fb->pitches[0]);
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OUT_RING(obj->gtt_offset + offset);
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OUT_RING(MI_NOOP);
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OUT_RING(0); /* aux display base address, unused */
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ADVANCE_LP_RING();
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out:
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return ret;
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