drm/atomic: Make drm_atomic_plane_disabling easier to understand.
This function becomes a lot simpler when having passed both the old and
new state to it. Looking at all callers, it seems that old_plane_state
is never NULL so the check can be dropped.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1487256430-7625-3-git-send-email-maarten.lankhorst@linux.intel.com
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
diff --git a/include/drm/drm_atomic_helper.h b/include/drm/drm_atomic_helper.h
index 9ceda37..dc16274 100644
--- a/include/drm/drm_atomic_helper.h
+++ b/include/drm/drm_atomic_helper.h
@@ -220,10 +220,10 @@ int drm_atomic_helper_legacy_gamma_set(struct drm_crtc *crtc,
__drm_atomic_get_current_plane_state((crtc_state)->state, \
plane)))
-/*
+/**
* drm_atomic_plane_disabling - check whether a plane is being disabled
- * @plane: plane object
- * @old_state: previous atomic state
+ * @old_plane_state: old atomic plane state
+ * @new_plane_state: new atomic plane state
*
* Checks the atomic state of a plane to determine whether it's being disabled
* or not. This also WARNs if it detects an invalid state (both CRTC and FB
@@ -233,28 +233,18 @@ int drm_atomic_helper_legacy_gamma_set(struct drm_crtc *crtc,
* True if the plane is being disabled, false otherwise.
*/
static inline bool
-drm_atomic_plane_disabling(struct drm_plane *plane,
- struct drm_plane_state *old_state)
+drm_atomic_plane_disabling(struct drm_plane_state *old_plane_state,
+ struct drm_plane_state *new_plane_state)
{
/*
* When disabling a plane, CRTC and FB should always be NULL together.
* Anything else should be considered a bug in the atomic core, so we
* gently warn about it.
*/
- WARN_ON((plane->state->crtc == NULL && plane->state->fb != NULL) ||
- (plane->state->crtc != NULL && plane->state->fb == NULL));
+ WARN_ON((new_plane_state->crtc == NULL && new_plane_state->fb != NULL) ||
+ (new_plane_state->crtc != NULL && new_plane_state->fb == NULL));
- /*
- * When using the transitional helpers, old_state may be NULL. If so,
- * we know nothing about the current state and have to assume that it
- * might be enabled.
- *
- * When using the atomic helpers, old_state won't be NULL. Therefore
- * this check assumes that either the driver will have reconstructed
- * the correct state in ->reset() or that the driver will have taken
- * appropriate measures to disable all planes.
- */
- return (!old_state || old_state->crtc) && !plane->state->crtc;
+ return old_plane_state->crtc && !new_plane_state->crtc;
}
#endif /* DRM_ATOMIC_HELPER_H_ */