tree 9157bb21d79e5a8297a3964f84d41c8b5a9bc82e
parent 7921e1477a5327ff22cc38a0ec74ace5d26dbba9
author Icenowy Zheng <icenowy@aosc.io> 1495032437 +0800
committer Maxime Ripard <maxime.ripard@free-electrons.com> 1496303243 +0200

drm/sun4i: abstract a engine type

As we are going to add support for the Allwinner DE2 engine in sun4i-drm
driver, we will finally have two types of display engines -- the DE1
backend and the DE2 mixer. They both do some display blending and feed
graphics data to TCON, and is part of the "Display Engine" called by
Allwinner, so I choose to call them both "engine" here.

Abstract the engine type to a new struct with an ops struct, which contains
functions that should be called outside the engine-specified code (in
TCON, CRTC or TV Encoder code).

In order to preserve bisectability, we also switch the backend and layer
code in its own module.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>