drm/sun4i: backend: Document the engine operations

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Our operations were missing some documentation to explain what was expected
from them.

Let's make that clearer.

Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Link: https://patchwork.freedesktop.org/patch/msgid/fdcd8ec3ae9ecd73ef089ede5218d3a41b49be05.1516613040.git-series.maxime.ripard@free-electrons.com

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Maxime Ripard 2018-01-22 10:25:16 +01:00

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commit c4c7c72e5c

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drivers/gpu/drm/sun4i/sunxi_engine.h

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