drm: rcar-du: Rework encoder enable/disable for atomic updates

When using atomic updates the encoder .enable() and .disable() helper
operations are preferred over the (then legacy) .prepare() and .commit()
operations. Implement .enable() and .disable() and rework .prepare(),
.commit() and .dpms() as wrappers around .enable() and .disable(),
easing their future removal.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

drivers/gpu/drm/rcar-du/rcar_du_encoder.c

@@ -42,13 +42,28 @@ rcar_du_connector_best_encoder(struct drm_connector *connector)
  * Encoder
  */
 
-static void rcar_du_encoder_dpms(struct drm_encoder *encoder, int mode)
+static void rcar_du_encoder_disable(struct drm_encoder *encoder)
 {
 	struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
 
 	if (renc->lvds)
-		rcar_du_lvdsenc_enable(renc->lvds, encoder->crtc,
-				       mode == DRM_MODE_DPMS_ON);
+		rcar_du_lvdsenc_enable(renc->lvds, encoder->crtc, false);
+}
+
+static void rcar_du_encoder_enable(struct drm_encoder *encoder)
+{
+	struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
+
+	if (renc->lvds)
+		rcar_du_lvdsenc_enable(renc->lvds, encoder->crtc, true);
+}
+
+static void rcar_du_encoder_dpms(struct drm_encoder *encoder, int mode)
+{
+	if (mode == DRM_MODE_DPMS_ON)
+		rcar_du_encoder_enable(encoder);
+	else
+		rcar_du_encoder_disable(encoder);
 }
 
 static bool rcar_du_encoder_mode_fixup(struct drm_encoder *encoder,
@@ -105,18 +120,12 @@ static bool rcar_du_encoder_mode_fixup(struct drm_encoder *encoder,
 
 static void rcar_du_encoder_mode_prepare(struct drm_encoder *encoder)
 {
-	struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
-
-	if (renc->lvds)
-		rcar_du_lvdsenc_enable(renc->lvds, encoder->crtc, false);
+	rcar_du_encoder_disable(encoder);
 }
 
 static void rcar_du_encoder_mode_commit(struct drm_encoder *encoder)
 {
-	struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
-
-	if (renc->lvds)
-		rcar_du_lvdsenc_enable(renc->lvds, encoder->crtc, true);
+	rcar_du_encoder_enable(encoder);
 }
 
 static void rcar_du_encoder_mode_set(struct drm_encoder *encoder,
@@ -134,6 +143,8 @@ static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
 	.prepare = rcar_du_encoder_mode_prepare,
 	.commit = rcar_du_encoder_mode_commit,
 	.mode_set = rcar_du_encoder_mode_set,
+	.disable = rcar_du_encoder_disable,
+	.enable = rcar_du_encoder_enable,
 };
 
 static const struct drm_encoder_funcs encoder_funcs = {