]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commit
drm/sun4i: backend: Make sure we don't have a commit pending
authorMaxime Ripard <maxime.ripard@free-electrons.com>
Mon, 22 Jan 2018 09:25:26 +0000 (10:25 +0100)
committerMaxime Ripard <maxime.ripard@free-electrons.com>
Mon, 22 Jan 2018 14:22:29 +0000 (15:22 +0100)
commitdd63250c55bf26a814c957f6772e8f8683b70077
treecff2ad1ac3587bba2344cd218a59d1a717976929
parent5d68be9185c8870669f050e37bc3ec8bee753ea4
drm/sun4i: backend: Make sure we don't have a commit pending

If we try to read the backend registers while it fetches the new values, we
end up with the value of some random register instead of the one we asked
for.

In order to prevent that, let's make sure that the very first thing we do
during our atomic modesetting is to let the commit bit come to a rest.

We don't have to worry about anything else since the only time we will
trigger a new transaction is during the atomic_commit which comes much
later.

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/35604307e5bde2b85c674de79fa7c4d55700f085.1516613040.git-series.maxime.ripard@free-electrons.com
drivers/gpu/drm/sun4i/sun4i_backend.c