UPSTREAM: drm/i915: Disable planes more atomically during modesets

Follow in the footsteps of commit c610e841 ("drm/i915:
Do plane/etc. updates more atomically across pipes") and
do the plane disables back to back for all pipes also when
we are disabling pipes.

This should provide for a potentially more atomic user
experience, which might be especially nice when using
joiner or tiled displays.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240305084730.19182-3-ville.syrjala@linux.intel.com


Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
(cherry picked from commit 4bc6745d)

BUG=b:308455498
TEST=Verify Asus PG32UQXR 4K160 mode on Rex using Big Joiner

Change-Id: Ib8b154825e749f91e6f7e5a01d7403d62aa895c3
Signed-off-by: Rakshith M O <rakshith.m.o@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/5802850


Reviewed-by: Sean Paul <sean@poorly.run>
Reviewed-by: Manasi Navare <navaremanasi@chromium.org>
Signed-off-by: Hubert Mazur <hmazur@google.com>