Use GDP capabilities to support DRM_FORMAT_XBGR8888 (XB24)
Signed-off-by: NFabien Dessenne <fabien.dessenne@st.com>

Use GDP capabilities to support DRM_FORMAT_ABGR8888 (AB24)
Signed-off-by: NBenjamin Gaignard <benjamin.gaignard@linaro.org>

For stih407 SoC enable the second mixer to get two CRTC.
Allow GPD planes and encoders to be connected to this new CRTC.
Cursor plane can only be set on first CRTC.
GPD clocks needed change the parent clock depending on which
CRTC GPD are used.
Signed-off-by: NBenjamin Gaignard <benjamin.gaignard@linaro.org>

Store the physical address at node creation time
to avoid use of virt_to_dma and dma_to_virt everywhere
Signed-off-by: NBenjamin Gaignard <benjamin.gaignard@linaro.org>

Compositor control all the input sub-device (VID, GDP)
and the mixer(s).
It is the main entry point for composition.
Layer interface is used to control the abstracted layers.

Add debug in mixer and GDP.
Signed-off-by: NBenjamin Gaignard <benjamin.gaignard@linaro.org>
Reviewed-by: NRob Clark <robdclark@gmail.com>

Generic Display Pipeline are one of the compositor input sub-devices.
GDP are dedicated to graphic input like RGB plans.
GDP is part of Compositor hardware block which will be introduce later.

A sti_layer structure is used to abstract GDP calls from Compositor.
Signed-off-by: NBenjamin Gaignard <benjamin.gaignard@linaro.org>
Reviewed-by: NRob Clark <robdclark@gmail.com>