drm: Update plane->fb also for page_flip

The legacy page_flip driver entry point is the only one left which
requires drivers to update plane->fb themselves. All the other entry
hooks will patch things up for the driver as needed since no one seems
to reliable get this right, see e.g. drm_mode_set_config_internal or
the plane->fb/old_fb handling in drm_mode_atomic_ioctl.

Therefore unify things, which allows us to ditch a TODO from
drm_atomic_helper_page_flip.

This should also help the atomic transition in i915 since we keep a
bit of legacy cruft only around because of this special behaviour in
->page_flip.

Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 5b59d5a..0898afb 100644 (file)
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -1915,10 +1915,6 @@ retry:
        if (ret != 0)
                goto fail;
 
-       /* TODO: ->page_flip is the only driver callback where the core
-        * doesn't update plane->fb. For now patch it up here. */
-       plane->fb = plane->state->fb;
-
        /* Driver takes ownership of state on successful async commit. */
        return 0;
 fail:

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 0bf46d5..2bbb232 100644 (file)
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -5345,13 +5345,7 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
                /* Keep the old fb, don't unref it. */
                crtc->primary->old_fb = NULL;
        } else {
-               /*
-                * Warn if the driver hasn't properly updated the crtc->fb
-                * field to reflect that the new framebuffer is now used.
-                * Failing to do so will screw with the reference counting
-                * on framebuffers.
-                */
-               WARN_ON(crtc->primary->fb != fb);
+               crtc->primary->fb = fb;
                /* Unref only the old framebuffer. */
                fb = NULL;
        }