[PATCH v1 1/1] media: qcom: camss: Restructure camss_link_entities

[Vikram Sharma <quic_vikramsa@quicinc.com>]

Refactor the camss_link_entities function by breaking it down into
three distinct functions. Each function will handle the linking of
a specific entity separately, enhancing readability.

Signed-off-by: Suresh Vankadara <quic_svankada@quicinc.com>
Signed-off-by: Trishansh Bhardwaj <quic_tbhardwa@quicinc.com>
Signed-off-by: Vikram Sharma <quic_vikramsa@quicinc.com>
---
 drivers/media/platform/qcom/camss/camss.c | 159 ++++++++++++++--------
 1 file changed, 105 insertions(+), 54 deletions(-)

diff --git a/drivers/media/platform/qcom/camss/camss.c b/drivers/media/platform/qcom/camss/camss.c
index fabe034081ed..1052c01b45f3 100644
--- a/drivers/media/platform/qcom/camss/camss.c
+++ b/drivers/media/platform/qcom/camss/camss.c
@@ -1840,14 +1840,66 @@ static int camss_init_subdevices(struct camss *camss)
 }
 
 /*
- * camss_link_entities - Register subdev nodes and create links
+ * camss_link_entities_csid - Register subdev nodes and create links
  * @camss: CAMSS device
  *
  * Return 0 on success or a negative error code on failure
  */
-static int camss_link_entities(struct camss *camss)
+static int camss_link_entities_csid(struct camss *camss)
 {
-	int i, j, k;
+	int i, j;
+	int ret, line_num;
+	u16 src_pad;
+	u16 sink_pad;
+	struct media_entity *src_entity;
+	struct media_entity *sink_entity;
+
+	for (i = 0; i < camss->res->csid_num; i++) {
+		if (camss->ispif)
+			line_num = camss->ispif->line_num;
+		else
+			line_num = camss->vfe[i].res->line_num;
+
+		src_entity = &camss->csid[i].subdev.entity;
+		for (j = 0; j < line_num; j++) {
+			if (camss->ispif) {
+				sink_entity = &camss->ispif->line[j].subdev.entity;
+				src_pad = MSM_CSID_PAD_SRC;
+				sink_pad = MSM_ISPIF_PAD_SINK;
+			} else {
+				sink_entity = &camss->vfe[i].line[j].subdev.entity;
+				src_pad = MSM_CSID_PAD_FIRST_SRC + j;
+				sink_pad = MSM_VFE_PAD_SINK;
+			}
+
+			ret = media_create_pad_link(src_entity,
+						    src_pad,
+						    sink_entity,
+						    sink_pad,
+						    0);
+			if (ret < 0) {
+				dev_err(camss->dev,
+					"Failed to link %s->%s entities: %d\n",
+					src_entity->name,
+					sink_entity->name,
+					ret);
+				return ret;
+			}
+		}
+	}
+
+	return 0;
+}
+
+/*
+ * camss_link_entities_csiphy - Register subdev nodes and create links
+ * @camss: CAMSS device
+ *
+ * Return 0 on success or a negative error code on failure
+ */
+static int camss_link_entities_csiphy(struct camss *camss)
+{
+	int i, j;
 	int ret;
 
 	for (i = 0; i < camss->res->csiphy_num; i++) {
@@ -1868,71 +1920,70 @@ static int camss_link_entities(struct camss *camss)
 		}
 	}
 
-	if (camss->ispif) {
-		for (i = 0; i < camss->res->csid_num; i++) {
-			for (j = 0; j < camss->ispif->line_num; j++) {
-				ret = media_create_pad_link(&camss->csid[i].subdev.entity,
-							    MSM_CSID_PAD_SRC,
-							    &camss->ispif->line[j].subdev.entity,
-							    MSM_ISPIF_PAD_SINK,
+	return 0;
+}
+
+/*
+ * camss_link_entities_ispif - Register subdev nodes and create links
+ * @camss: CAMSS device
+ *
+ * Return 0 on success or a negative error code on failure
+ */
+static int camss_link_entities_ispif(struct camss *camss)
+{
+	int i, j, k;
+	int ret;
+
+	for (i = 0; i < camss->ispif->line_num; i++) {
+		for (k = 0; k < camss->res->vfe_num; k++) {
+			for (j = 0; j < camss->vfe[k].res->line_num; j++) {
+				struct v4l2_subdev *ispif = &camss->ispif->line[i].subdev;
+				struct v4l2_subdev *vfe = &camss->vfe[k].line[j].subdev;
+
+				ret = media_create_pad_link(&ispif->entity,
+							    MSM_ISPIF_PAD_SRC,
+							    &vfe->entity,
+							    MSM_VFE_PAD_SINK,
 							    0);
 				if (ret < 0) {
 					dev_err(camss->dev,
 						"Failed to link %s->%s entities: %d\n",
-						camss->csid[i].subdev.entity.name,
-						camss->ispif->line[j].subdev.entity.name,
+						ispif->entity.name,
+						vfe->entity.name,
 						ret);
 					return ret;
 				}
 			}
 		}
-
-		for (i = 0; i < camss->ispif->line_num; i++)
-			for (k = 0; k < camss->res->vfe_num; k++)
-				for (j = 0; j < camss->vfe[k].res->line_num; j++) {
-					struct v4l2_subdev *ispif = &camss->ispif->line[i].subdev;
-					struct v4l2_subdev *vfe = &camss->vfe[k].line[j].subdev;
-
-					ret = media_create_pad_link(&ispif->entity,
-								    MSM_ISPIF_PAD_SRC,
-								    &vfe->entity,
-								    MSM_VFE_PAD_SINK,
-								    0);
-					if (ret < 0) {
-						dev_err(camss->dev,
-							"Failed to link %s->%s entities: %d\n",
-							ispif->entity.name,
-							vfe->entity.name,
-							ret);
-						return ret;
-					}
-				}
-	} else {
-		for (i = 0; i < camss->res->csid_num; i++)
-			for (k = 0; k < camss->res->vfe_num; k++)
-				for (j = 0; j < camss->vfe[k].res->line_num; j++) {
-					struct v4l2_subdev *csid = &camss->csid[i].subdev;
-					struct v4l2_subdev *vfe = &camss->vfe[k].line[j].subdev;
-
-					ret = media_create_pad_link(&csid->entity,
-								    MSM_CSID_PAD_FIRST_SRC + j,
-								    &vfe->entity,
-								    MSM_VFE_PAD_SINK,
-								    0);
-					if (ret < 0) {
-						dev_err(camss->dev,
-							"Failed to link %s->%s entities: %d\n",
-							csid->entity.name,
-							vfe->entity.name,
-							ret);
-						return ret;
-					}
-				}
 	}
 
 	return 0;
 }
 
+/*
+ * camss_link_entities - Register subdev nodes and create links
+ * @camss: CAMSS device
+ *
+ * Return 0 on success or a negative error code on failure
+ */
+static int camss_link_entities(struct camss *camss)
+{
+	int ret;
+
+	ret = camss_link_entities_csiphy(camss);
+	if (ret < 0)
+		return ret;
+
+	ret = camss_link_entities_csid(camss);
+	if (ret < 0)
+		return ret;
+
+	if (camss->ispif)
+		ret = camss_link_entities_ispif(camss);
+
+	return ret;
+}
+
 /*
  * camss_register_entities - Register subdev nodes and create links
  * @camss: CAMSS device
-- 
2.25.1