[PATCH v7 15/17] drm: rcar-du: Move rcar_du_encoders_init()

[Biju Das]

RZ/G2L supports only DSI and DPI. Add rcar_du_encoders_init() to handle
the pointer to du_output_name(), so that we can share du_encoders_init()
between RCar and RZ/G2L kms drivers.

Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
---
v6->v7:
 * Rebased to drm-tip.
v1->v6:
 * Rebased on drm-misc-next and DU-next.
v1:
 * Created the lib suggested by Laurent.
Ref:
 https://patchwork.kernel.org/project/linux-renesas-soc/patch/20220316131100.30685-6-biju.das.jz@xxxxxxxxxxxxxx/
---
 drivers/gpu/drm/rcar-du/rcar_du_kms.c     |  92 +------------------
 drivers/gpu/drm/rcar-du/rcar_du_kms_lib.c | 102 ++++++++++++++++++++++
 drivers/gpu/drm/rcar-du/rcar_du_kms_lib.h |   6 ++
 3 files changed, 110 insertions(+), 90 deletions(-)

diff --git a/drivers/gpu/drm/rcar-du/rcar_du_kms.c b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
index b0b40b1cc37d..94f1602ea707 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_kms.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
@@ -69,95 +69,6 @@ static const struct drm_mode_config_funcs rcar_du_mode_config_funcs = {
 	.atomic_commit = drm_atomic_helper_commit,
 };
 
-static int rcar_du_encoders_init_one(struct rcar_du_device *rcdu,
-				     enum rcar_du_output output,
-				     struct of_endpoint *ep)
-{
-	struct device_node *entity;
-	int ret;
-
-	/* Locate the connected entity and initialize the encoder. */
-	entity = of_graph_get_remote_port_parent(ep->local_node);
-	if (!entity) {
-		dev_dbg(rcdu->dev, "unconnected endpoint %pOF, skipping\n",
-			ep->local_node);
-		return -ENODEV;
-	}
-
-	if (!of_device_is_available(entity)) {
-		dev_dbg(rcdu->dev,
-			"connected entity %pOF is disabled, skipping\n",
-			entity);
-		of_node_put(entity);
-		return -ENODEV;
-	}
-
-	ret = rcar_du_encoder_init(rcdu, output, entity);
-	if (ret && ret != -EPROBE_DEFER && ret != -ENOLINK)
-		dev_warn(rcdu->dev,
-			 "failed to initialize encoder %pOF on output %s (%d), skipping\n",
-			 entity, rcar_du_output_name(output), ret);
-
-	of_node_put(entity);
-
-	return ret;
-}
-
-static int rcar_du_encoders_init(struct rcar_du_device *rcdu)
-{
-	struct device_node *np = rcdu->dev->of_node;
-	struct device_node *ep_node;
-	unsigned int num_encoders = 0;
-
-	/*
-	 * Iterate over the endpoints and create one encoder for each output
-	 * pipeline.
-	 */
-	for_each_endpoint_of_node(np, ep_node) {
-		enum rcar_du_output output;
-		struct of_endpoint ep;
-		unsigned int i;
-		int ret;
-
-		ret = of_graph_parse_endpoint(ep_node, &ep);
-		if (ret < 0) {
-			of_node_put(ep_node);
-			return ret;
-		}
-
-		/* Find the output route corresponding to the port number. */
-		for (i = 0; i < RCAR_DU_OUTPUT_MAX; ++i) {
-			if (rcdu->info->routes[i].possible_crtcs &&
-			    rcdu->info->routes[i].port == ep.port) {
-				output = i;
-				break;
-			}
-		}
-
-		if (i == RCAR_DU_OUTPUT_MAX) {
-			dev_warn(rcdu->dev,
-				 "port %u references unexisting output, skipping\n",
-				 ep.port);
-			continue;
-		}
-
-		/* Process the output pipeline. */
-		ret = rcar_du_encoders_init_one(rcdu, output, &ep);
-		if (ret < 0) {
-			if (ret == -EPROBE_DEFER) {
-				of_node_put(ep_node);
-				return ret;
-			}
-
-			continue;
-		}
-
-		num_encoders++;
-	}
-
-	return num_encoders;
-}
-
 static int rcar_du_properties_init(struct rcar_du_device *rcdu)
 {
 	/*
@@ -457,7 +368,8 @@ int rcar_du_modeset_init(struct rcar_du_device *rcdu)
 	}
 
 	/* Initialize the encoders. */
-	ret = rcar_du_encoders_init(rcdu);
+	ret = rcar_du_encoders_init(rcdu, rcar_du_output_name,
+				    rcar_du_encoder_init);
 	if (ret < 0)
 		return ret;
 
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_kms_lib.c b/drivers/gpu/drm/rcar-du/rcar_du_kms_lib.c
index 13d033009c9f..781e666a45a8 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_kms_lib.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_kms_lib.c
@@ -15,6 +15,8 @@
 #include <drm/drm_gem_dma_helper.h>
 #include <drm/drm_gem_framebuffer_helper.h>
 
+#include <linux/of_graph.h>
+#include <linux/of_platform.h>
 #include <linux/videodev2.h>
 
 #include "rcar_du_drv.h"
@@ -535,3 +537,103 @@ rcar_du_lib_mode_cfg_helper_get(void)
 {
 	return &rcar_du_mode_config_helper;
 }
+
+static int
+rcar_du_encoders_init_one(struct rcar_du_device *rcdu,
+			  enum rcar_du_output output,
+			  struct of_endpoint *ep,
+			  const char *output_name,
+			  int (*rcar_du_encoder_init_fn)(struct rcar_du_device *r,
+							 enum rcar_du_output op,
+							 struct device_node *d))
+{
+	struct device_node *entity;
+	int ret;
+
+	/* Locate the connected entity and initialize the encoder. */
+	entity = of_graph_get_remote_port_parent(ep->local_node);
+	if (!entity) {
+		dev_dbg(rcdu->dev, "unconnected endpoint %pOF, skipping\n",
+			ep->local_node);
+		return -ENODEV;
+	}
+
+	if (!of_device_is_available(entity)) {
+		dev_dbg(rcdu->dev,
+			"connected entity %pOF is disabled, skipping\n",
+			entity);
+		of_node_put(entity);
+		return -ENODEV;
+	}
+
+	ret = rcar_du_encoder_init_fn(rcdu, output, entity);
+	if (ret && ret != -EPROBE_DEFER && ret != -ENOLINK)
+		dev_warn(rcdu->dev,
+			 "failed to initialize encoder %pOF on output %s (%d), skipping\n",
+			 entity, output_name, ret);
+
+	of_node_put(entity);
+
+	return ret;
+}
+
+int rcar_du_encoders_init(struct rcar_du_device *rcdu,
+			  const char* (*out_name)(enum rcar_du_output output),
+			  int (*encoder_init_fn)(struct rcar_du_device *rcdu,
+						 enum rcar_du_output output,
+						 struct device_node *enc_node))
+{
+	struct device_node *np = rcdu->dev->of_node;
+	struct device_node *ep_node;
+	unsigned int num_encoders = 0;
+
+	/*
+	 * Iterate over the endpoints and create one encoder for each output
+	 * pipeline.
+	 */
+	for_each_endpoint_of_node(np, ep_node) {
+		enum rcar_du_output output;
+		struct of_endpoint ep;
+		unsigned int i;
+		int ret;
+
+		ret = of_graph_parse_endpoint(ep_node, &ep);
+		if (ret < 0) {
+			of_node_put(ep_node);
+			return ret;
+		}
+
+		/* Find the output route corresponding to the port number. */
+		for (i = 0; i < RCAR_DU_OUTPUT_MAX; ++i) {
+			if (rcdu->info->routes[i].possible_crtcs &&
+			    rcdu->info->routes[i].port == ep.port) {
+				output = i;
+				break;
+			}
+		}
+
+		if (i == RCAR_DU_OUTPUT_MAX) {
+			dev_warn(rcdu->dev,
+				 "port %u references unexisting output, skipping\n",
+				 ep.port);
+			continue;
+		}
+
+		/* Process the output pipeline. */
+		ret = rcar_du_encoders_init_one(rcdu, output, &ep,
+						out_name(output),
+						encoder_init_fn);
+		if (ret < 0) {
+			if (ret == -EPROBE_DEFER) {
+				of_node_put(ep_node);
+				return ret;
+			}
+
+			continue;
+		}
+
+		num_encoders++;
+	}
+
+	return num_encoders;
+}
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_kms_lib.h b/drivers/gpu/drm/rcar-du/rcar_du_kms_lib.h
index be36b98b2d5d..ace973b80fe6 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_kms_lib.h
+++ b/drivers/gpu/drm/rcar-du/rcar_du_kms_lib.h
@@ -45,4 +45,10 @@ rcar_du_lib_fb_create(struct drm_device *dev, struct drm_file *file_priv,
 const struct drm_mode_config_helper_funcs *
 rcar_du_lib_mode_cfg_helper_get(void);
 
+int rcar_du_encoders_init(struct rcar_du_device *rcdu,
+			  const char* (*out_name)(enum rcar_du_output output),
+			  int (*encoder_init_fn)(struct rcar_du_device *rcdu,
+						 enum rcar_du_output output,
+						 struct device_node *enc_node));
+
 #endif /* __RCAR_DU_KMS_LIB_H__ */
-- 
2.25.1