drm/atmel-hlcdc: Replace the panel usage with drm_panel_bridge.

This cuts 135 lines of boilerplate, at the cost of losing the
filtering of get_modes() using atmel_hlcdc_dc_mode_valid().  The
atomic check will still check that we don't set an invalid mode,
though.
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20170511183128.25085-7-eric@anholt.net

drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c

@@ -23,191 +23,56 @@
 
 #include <drm/drmP.h>
 #include <drm/drm_of.h>
+#include <drm/drm_bridge.h>
 
 #include "atmel_hlcdc_dc.h"
 
-/**
- * Atmel HLCDC RGB connector structure
- *
- * This structure stores RGB slave device information.
- *
- * @connector: DRM connector
- * @encoder: DRM encoder
- * @dc: pointer to the atmel_hlcdc_dc structure
- * @panel: panel connected on the RGB output
- */
-struct atmel_hlcdc_rgb_output {
-	struct drm_connector connector;
-	struct drm_encoder encoder;
-	struct atmel_hlcdc_dc *dc;
-	struct drm_panel *panel;
-};
-
-static inline struct atmel_hlcdc_rgb_output *
-drm_connector_to_atmel_hlcdc_rgb_output(struct drm_connector *connector)
-{
-	return container_of(connector, struct atmel_hlcdc_rgb_output,
-			    connector);
-}
-
-static inline struct atmel_hlcdc_rgb_output *
-drm_encoder_to_atmel_hlcdc_rgb_output(struct drm_encoder *encoder)
-{
-	return container_of(encoder, struct atmel_hlcdc_rgb_output, encoder);
-}
-
-static void atmel_hlcdc_rgb_encoder_enable(struct drm_encoder *encoder)
-{
-	struct atmel_hlcdc_rgb_output *rgb =
-			drm_encoder_to_atmel_hlcdc_rgb_output(encoder);
-
-	if (rgb->panel) {
-		drm_panel_prepare(rgb->panel);
-		drm_panel_enable(rgb->panel);
-	}
-}
-
-static void atmel_hlcdc_rgb_encoder_disable(struct drm_encoder *encoder)
-{
-	struct atmel_hlcdc_rgb_output *rgb =
-			drm_encoder_to_atmel_hlcdc_rgb_output(encoder);
-
-	if (rgb->panel) {
-		drm_panel_disable(rgb->panel);
-		drm_panel_unprepare(rgb->panel);
-	}
-}
-
-static const struct drm_encoder_helper_funcs atmel_hlcdc_panel_encoder_helper_funcs = {
-	.disable = atmel_hlcdc_rgb_encoder_disable,
-	.enable = atmel_hlcdc_rgb_encoder_enable,
-};
-
 static const struct drm_encoder_funcs atmel_hlcdc_panel_encoder_funcs = {
 	.destroy = drm_encoder_cleanup,
 };
 
-static int atmel_hlcdc_panel_get_modes(struct drm_connector *connector)
-{
-	struct atmel_hlcdc_rgb_output *rgb =
-			drm_connector_to_atmel_hlcdc_rgb_output(connector);
-
-	if (rgb->panel)
-		return rgb->panel->funcs->get_modes(rgb->panel);
-
-	return 0;
-}
-
-static int atmel_hlcdc_rgb_mode_valid(struct drm_connector *connector,
-				      struct drm_display_mode *mode)
-{
-	struct atmel_hlcdc_rgb_output *rgb =
-			drm_connector_to_atmel_hlcdc_rgb_output(connector);
-
-	return atmel_hlcdc_dc_mode_valid(rgb->dc, mode);
-}
-
-static const struct drm_connector_helper_funcs atmel_hlcdc_panel_connector_helper_funcs = {
-	.get_modes = atmel_hlcdc_panel_get_modes,
-	.mode_valid = atmel_hlcdc_rgb_mode_valid,
-};
-
-static enum drm_connector_status
-atmel_hlcdc_panel_connector_detect(struct drm_connector *connector, bool force)
-{
-	struct atmel_hlcdc_rgb_output *rgb =
-			drm_connector_to_atmel_hlcdc_rgb_output(connector);
-
-	if (rgb->panel)
-		return connector_status_connected;
-
-	return connector_status_disconnected;
-}
-
-static void
-atmel_hlcdc_panel_connector_destroy(struct drm_connector *connector)
-{
-	struct atmel_hlcdc_rgb_output *rgb =
-			drm_connector_to_atmel_hlcdc_rgb_output(connector);
-
-	if (rgb->panel)
-		drm_panel_detach(rgb->panel);
-
-	drm_connector_cleanup(connector);
-}
-
-static const struct drm_connector_funcs atmel_hlcdc_panel_connector_funcs = {
-	.dpms = drm_atomic_helper_connector_dpms,
-	.detect = atmel_hlcdc_panel_connector_detect,
-	.fill_modes = drm_helper_probe_single_connector_modes,
-	.destroy = atmel_hlcdc_panel_connector_destroy,
-	.reset = drm_atomic_helper_connector_reset,
-	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
-	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
-};
-
 static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,
 				       const struct device_node *np)
 {
-	struct atmel_hlcdc_dc *dc = dev->dev_private;
-	struct atmel_hlcdc_rgb_output *output;
+	struct drm_encoder *encoder;
 	struct drm_panel *panel;
 	struct drm_bridge *bridge;
 	int ret;
 
-	output = devm_kzalloc(dev->dev, sizeof(*output), GFP_KERNEL);
-	if (!output)
+	encoder = devm_kzalloc(dev->dev, sizeof(*encoder), GFP_KERNEL);
+	if (!encoder)
 		return -EINVAL;
 
-	output->dc = dc;
-
-	drm_encoder_helper_add(&output->encoder,
-			       &atmel_hlcdc_panel_encoder_helper_funcs);
-	ret = drm_encoder_init(dev, &output->encoder,
+	ret = drm_encoder_init(dev, encoder,
 			       &atmel_hlcdc_panel_encoder_funcs,
 			       DRM_MODE_ENCODER_NONE, NULL);
 	if (ret)
 		return ret;
 
-	output->encoder.possible_crtcs = 0x1;
+	encoder->possible_crtcs = 0x1;
 
 	ret = drm_of_find_panel_or_bridge(np, 0, 0, &panel, &bridge);
 	if (ret)
 		return ret;
 
 	if (panel) {
-		output->connector.dpms = DRM_MODE_DPMS_OFF;
-		output->connector.polled = DRM_CONNECTOR_POLL_CONNECT;
-		drm_connector_helper_add(&output->connector,
-				&atmel_hlcdc_panel_connector_helper_funcs);
-		ret = drm_connector_init(dev, &output->connector,
-					 &atmel_hlcdc_panel_connector_funcs,
-					 DRM_MODE_CONNECTOR_Unknown);
-		if (ret)
-			goto err_encoder_cleanup;
-
-		drm_mode_connector_attach_encoder(&output->connector,
-						  &output->encoder);
-
-		ret = drm_panel_attach(panel, &output->connector);
-		if (ret) {
-			drm_connector_cleanup(&output->connector);
-			goto err_encoder_cleanup;
-		}
-
-		output->panel = panel;
+		bridge = drm_panel_bridge_add(panel, DRM_MODE_CONNECTOR_Unknown);
+		if (IS_ERR(bridge))
+			return PTR_ERR(bridge);
 
 		return 0;
 	}
 
 	if (bridge) {
-		ret = drm_bridge_attach(&output->encoder, bridge, NULL);
+		ret = drm_bridge_attach(encoder, bridge, NULL);
 		if (!ret)
 			return 0;
+
+		if (panel)
+			drm_panel_bridge_remove(bridge);
 	}
 
-err_encoder_cleanup:
-	drm_encoder_cleanup(&output->encoder);
+	drm_encoder_cleanup(encoder);
 
 	return ret;
 }