drm/sun4i: backend: Fetch backend ID from device tree

Browse source

Some Allwinner SoCs have 2 display pipelines, as in 2 of each
components, including the frontend, backend, TCON, and any other
extras.

As the backend and TCON are always paired together and form the CRTC,
we need to know which backend or TCON we are currently probing, so we
can pair them when initializing the CRTC.

This patch figures out the backend's ID from the device tree and stores
it in the backend's data structure. It does this by looking at the "reg"
property of any remote endpoints connected to the backend's input port.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

...

This commit is contained in:

Chen-Yu Tsai 2017-04-21 16:38:52 +08:00 • committed by Maxime Ripard

parent fdde6e7bcd

commit da3a1c30dc

2 changed files with 46 additions and 0 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

44

drivers/gpu/drm/sun4i/sun4i_backend.c

View file

2

drivers/gpu/drm/sun4i/sun4i_backend.h

View file