[PATCH v2 3/6] drm: rcar-du: Add pre/post commit CRTC helpers

[Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>]

Provide helpers to allow CRTC configuration to be separated from the power
state handling. rcar_du_crtc_atomic_post_commit() is a no-op, but maintained
for API symmetry.

---
 drivers/gpu/drm/rcar-du/rcar_du_crtc.c | 25 +++++++++++++++++++++++--
 drivers/gpu/drm/rcar-du/rcar_du_crtc.h |  5 +++++
 drivers/gpu/drm/rcar-du/rcar_du_kms.c  |  2 ++
 3 files changed, 30 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
index 6109a97b0bb9..2606de788688 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
@@ -515,8 +515,6 @@ static int rcar_du_crtc_enable(struct rcar_du_crtc *rcrtc)
 	if (ret < 0)
 		goto error_group;
 
-	rcar_du_crtc_setup(rcrtc);
-
 	return 0;
 
 error_group:
@@ -683,6 +681,29 @@ int rcar_du_crtc_atomic_enter_standby(struct drm_device *dev,
 	return 0;
 }
 
+int rcar_du_crtc_atomic_pre_commit(struct drm_device *dev,
+				   struct drm_atomic_state *state)
+{
+	struct drm_crtc *crtc;
+	struct drm_crtc_state *crtc_state;
+	unsigned int i;
+
+	for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
+		struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
+
+		if (crtc_state->active_changed && crtc_state->active)
+			rcar_du_crtc_setup(rcrtc);
+	}
+
+	return 0;
+}
+
+int rcar_du_crtc_atomic_post_commit(struct drm_device *dev,
+				    struct drm_atomic_state *state)
+{
+	return 0;
+}
+
 static void rcar_du_crtc_atomic_enable(struct drm_crtc *crtc,
 				       struct drm_crtc_state *old_state)
 {
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.h b/drivers/gpu/drm/rcar-du/rcar_du_crtc.h
index d12d4a788e9f..0b60a6e0b753 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.h
+++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.h
@@ -105,6 +105,11 @@ int rcar_du_crtc_atomic_exit_standby(struct drm_device *dev,
 int rcar_du_crtc_atomic_enter_standby(struct drm_device *dev,
 				      struct drm_atomic_state *state);
 
+int rcar_du_crtc_atomic_pre_commit(struct drm_device *dev,
+				   struct drm_atomic_state *state);
+int rcar_du_crtc_atomic_post_commit(struct drm_device *dev,
+				    struct drm_atomic_state *state);
+
 void rcar_du_crtc_dsysr_clr_set(struct rcar_du_crtc *rcrtc, u32 clr, u32 set);
 
 #endif /* __RCAR_DU_CRTC_H__ */
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_kms.c b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
index b8da4dfc79d2..e4befb1937f8 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_kms.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
@@ -304,12 +304,14 @@ static void rcar_du_atomic_commit_tail(struct drm_atomic_state *old_state)
 
 	/* Apply the atomic update. */
 	rcar_du_crtc_atomic_exit_standby(dev, old_state);
+	rcar_du_crtc_atomic_pre_commit(dev, old_state);
 
 	drm_atomic_helper_commit_modeset_disables(dev, old_state);
 	drm_atomic_helper_commit_planes(dev, old_state,
 					DRM_PLANE_COMMIT_ACTIVE_ONLY);
 	drm_atomic_helper_commit_modeset_enables(dev, old_state);
 
+	rcar_du_crtc_atomic_post_commit(dev, old_state);
 	rcar_du_crtc_atomic_enter_standby(dev, old_state);
 
 	drm_atomic_helper_commit_hw_done(old_state);
-- 
2.19.1