Hello Vikram.
On 11/12/24 15:38, Vikram Sharma wrote:
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@xxxxxxxxxxx>
Signed-off-by: Trishansh Bhardwaj <quic_tbhardwa@xxxxxxxxxxx>
Signed-off-by: Vikram Sharma <quic_vikramsa@xxxxxxxxxxx>
---
drivers/media/platform/qcom/camss/camss-vfe.c | 6 +-
drivers/media/platform/qcom/camss/camss.c | 196 ++++++++++++------
drivers/media/platform/qcom/camss/camss.h | 4 +
3 files changed, 138 insertions(+), 68 deletions(-)
diff --git a/drivers/media/platform/qcom/camss/camss-vfe.c b/drivers/media/platform/qcom/camss/camss-vfe.c
index 83c5a36d071f..446604cc7ef6 100644
--- a/drivers/media/platform/qcom/camss/camss-vfe.c
+++ b/drivers/media/platform/qcom/camss/camss-vfe.c
@@ -1794,9 +1794,9 @@ int msm_vfe_register_entities(struct vfe_device *vfe,
&video_out->vdev.entity, 0,
MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
if (ret < 0) {
- dev_err(dev, "Failed to link %s->%s entities: %d\n",
- sd->entity.name, video_out->vdev.entity.name,
- ret);
+ camss_link_err(vfe->camss, sd->entity.name,
+ video_out->vdev.entity.name,
+ ret);
As Bryan said, the change above is unrelated to the restructuring.
See also my next comment.
goto error_link;
}
}
diff --git a/drivers/media/platform/qcom/camss/camss.c b/drivers/media/platform/qcom/camss/camss.c
index fabe034081ed..980cb1e337be 100644
--- a/drivers/media/platform/qcom/camss/camss.c
+++ b/drivers/media/platform/qcom/camss/camss.c
@@ -1840,14 +1840,83 @@ static int camss_init_subdevices(struct camss *camss)
}
/*
- * camss_link_entities - Register subdev nodes and create links
+ * camss_link_err - print error in case link creation fails
+ * @src_name: name for source of the link
+ * @sink_name: name for sink of the link
+ */
+inline void camss_link_err(struct camss *camss,
+ const char *src_name,
+ const char *sink_name,
+ int ret)
+{
+ if (!camss || !src_name || !sink_name)
+ return;
+ dev_err(camss->dev,
+ "Failed to link %s->%s entities: %d\n",
+ src_name,
+ sink_name,
+ ret);
+}
I believe this new function is simply not needed. It is not helpful.
+/*
+ * 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;
+ struct media_entity *src_entity;
+ struct media_entity *sink_entity;
+ int ret, line_num;
+ u16 sink_pad;
+ u16 src_pad;
+ int i, j;
+
+ 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;
+ }
So, you split one solid function, which covers csid->ispif and ispif->vfe
into two separate functions, the logic of "if (camss->ispif)" is applied
twice in two different functions, while before the change it was done just
once, then why does it enhance readability? I think it's just the opposite...
+
+ ret = media_create_pad_link(src_entity,
+ src_pad,
+ sink_entity,
+ sink_pad,
+ 0);
+ if (ret < 0) {
+ camss_link_err(camss, 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++) {
@@ -1858,81 +1927,77 @@ static int camss_link_entities(struct camss *camss)
MSM_CSID_PAD_SINK,
0);
if (ret < 0) {
- dev_err(camss->dev,
- "Failed to link %s->%s entities: %d\n",
- camss->csiphy[i].subdev.entity.name,
- camss->csid[j].subdev.entity.name,
- ret);
+ camss_link_err(camss,
+ camss->csiphy[i].subdev.entity.name,
+ camss->csid[j].subdev.entity.name,
+ ret);
return ret;
}
}
}
- 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,
- ret);
+ camss_link_err(camss, 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);
Since there is an expectation that the change is non-functional, please
keep the logic unmodified.
if (camss->ispif) {
ret = camss_link_entities_ispif(camss);
} else {
}
+ return ret;
+}
+
/*
* camss_register_entities - Register subdev nodes and create links
* @camss: CAMSS device
@@ -2073,9 +2138,10 @@ static int camss_subdev_notifier_complete(struct v4l2_async_notifier *async)
input, MSM_CSIPHY_PAD_SINK,
MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
if (ret < 0) {
- dev_err(camss->dev,
- "Failed to link %s->%s entities: %d\n",
- sensor->name, input->name, ret);
+ camss_link_err(camss,
+ sensor->name,
+ input->name,
+ ret);
return ret;
}
}
diff --git a/drivers/media/platform/qcom/camss/camss.h b/drivers/media/platform/qcom/camss/camss.h
index 0ce84fcbbd25..2086000ad5c1 100644
--- a/drivers/media/platform/qcom/camss/camss.h
+++ b/drivers/media/platform/qcom/camss/camss.h
@@ -160,5 +160,9 @@ void camss_pm_domain_off(struct camss *camss, int id);
int camss_vfe_get(struct camss *camss, int id);
void camss_vfe_put(struct camss *camss, int id);
void camss_delete(struct camss *camss);
+void camss_link_err(struct camss *camss,
+ const char *src_name,
+ const char *sink_name,
+ int ret);
Please don't add this into the header file. Drop it.
#endif /* QC_MSM_CAMSS_H */
In fact I didn't find the change as a simplification, because now there are
more if-branches apparently. Is there a reason why the change is needed?
--
Best wishes,
Vladimir
