drm/atomic: Unconditionally call prepare_fb.

Atomic drivers may set properties like rotation on the same fb, which
may require a call to prepare_fb even when framebuffer stays identical.

Instead of handling all the special cases in the core, let the driver
decide when prepare_fb and cleanup_fb are noops.

This is a revert of:

commit fcc60b413d14dd06ddbd79ec50e83c4fb2a097ba
Author: Keith Packard <keithp@keithp.com>
Date:   Sat Jun 4 01:16:22 2016 -0700

    drm: Don't prepare or cleanup unchanging frame buffers [v3]

The original commit mentions that this prevents waiting in i915 on all
previous rendering during cursor updates, but there are better ways to
fix this.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/6d82f9b6-9d16-91d1-d176-4a37b09afc44@linux.intel.com
(cherry picked from commit 0532be078a207d7dd6ad26ebd0834e258acc4ee7)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1485854491-27389-2-git-send-email-maarten.lankhorst@linux.intel.com

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 34f757bcabae8d88382f18392467e67f4e0f6100..4594477dee00bc0ffb7847da556985848df717e7 100644 (file)
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -1666,9 +1666,6 @@ int drm_atomic_helper_prepare_planes(struct drm_device *dev,
 
                funcs = plane->helper_private;
 
-               if (!drm_atomic_helper_framebuffer_changed(dev, state, plane_state->crtc))
-                       continue;
-
                if (funcs->prepare_fb) {
                        ret = funcs->prepare_fb(plane, plane_state);
                        if (ret)
@@ -1685,9 +1682,6 @@ fail:
                if (j >= i)
                        continue;
 
-               if (!drm_atomic_helper_framebuffer_changed(dev, state, plane_state->crtc))
-                       continue;
-
                funcs = plane->helper_private;
 
                if (funcs->cleanup_fb)
@@ -1954,9 +1948,6 @@ void drm_atomic_helper_cleanup_planes(struct drm_device *dev,
        for_each_plane_in_state(old_state, plane, plane_state, i) {
                const struct drm_plane_helper_funcs *funcs;
 
-               if (!drm_atomic_helper_framebuffer_changed(dev, old_state, plane_state->crtc))
-                       continue;
-
                funcs = plane->helper_private;
 
                if (funcs->cleanup_fb)