Merge tag 'drm/tegra/for-3.20-rc1' of git://anongit.freedesktop.org/tegra/linux into drm-next

drm/tegra: Changes for v3.20-rc1

The biggest part of these changes is the conversion to atomic mode-
setting. A lot of cleanup and demidlayering was required before the
conversion, with the result being a whole lot of changes.

Besides the atomic mode-setting support, the host1x bus now has the
proper infrastructure to support suspend/resume for child devices.

Finally, a couple of smaller cleanup patches round things off.

* tag 'drm/tegra/for-3.20-rc1' of git://anongit.freedesktop.org/tegra/linux: (54 commits)
  drm/tegra: Use correct relocation target offsets
  drm/tegra: Add minimal power management
  drm/tegra: dc: Unify enabling the display controller
  drm/tegra: Track tiling and format in plane state
  drm/tegra: Track active planes in CRTC state
  drm/tegra: Remove unused ->mode_fixup() callbacks
  drm/tegra: Atomic conversion, phase 3, step 3
  drm/tegra: Atomic conversion, phase 3, step 2
  drm/tegra: dc: Use atomic clock state in modeset
  drm/tegra: sor: Implement ->atomic_check()
  drm/tegra: hdmi: Implement ->atomic_check()
  drm/tegra: dsi: Implement ->atomic_check()
  drm/tegra: rgb: Implement ->atomic_check()
  drm/tegra: dc: Store clock setup in atomic state
  drm/tegra: Atomic conversion, phase 3, step 1
  drm/tegra: Atomic conversion, phase 2
  drm/tegra: Atomic conversion, phase 1
  drm/tegra: dc: Do not needlessly deassert reset
  drm/tegra: Output cleanup functions cannot fail
  drm/tegra: Remove remnants of the output midlayer
  ...

1 files changed, 37 insertions, 0 deletions

diff --git a/include/drm/drm_atomic_helper.h b/include/drm/drm_atomic_helper.h
index 2095917ff8c7..a0ea4ded3cb5 100644
--- a/include/drm/drm_atomic_helper.h
+++ b/include/drm/drm_atomic_helper.h
@@ -127,4 +127,41 @@ void drm_atomic_helper_connector_destroy_state(struct drm_connector *connector,
 #define drm_atomic_crtc_state_for_each_plane(plane, crtc_state) \
 	drm_for_each_plane_mask(plane, (crtc_state)->state->dev, (crtc_state)->plane_mask)
 
+/*
+ * drm_atomic_plane_disabling - check whether a plane is being disabled
+ * @plane: plane object
+ * @old_state: previous atomic 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
+ * need to either both be NULL or both be non-NULL).
+ *
+ * RETURNS:
+ * 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)
+{
+	/*
+	 * 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));
+
+	/*
+	 * 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;
+}
+
 #endif /* DRM_ATOMIC_HELPER_H_ */