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Subject[PATCH 4/4] media: imx: Don't register IPU subdevs/links if CSI port missing
Date
The second IPU internal sub-devices were being registered and links
to them created even when the second IPU is not present. This is wrong
for i.MX6 S/DL and i.MX53 which have only a single IPU.

Fixes: e130291212df5 ("[media] media: Add i.MX media core driver")

Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
Cc: stable@vger.kernel.org
---
drivers/staging/media/imx/imx-media-dev.c | 7 --
.../staging/media/imx/imx-media-internal-sd.c | 22 +-----
drivers/staging/media/imx/imx-media-of.c | 76 ++++++++++++-------
drivers/staging/media/imx/imx-media.h | 3 +-
4 files changed, 53 insertions(+), 55 deletions(-)

diff --git a/drivers/staging/media/imx/imx-media-dev.c b/drivers/staging/media/imx/imx-media-dev.c
index edf9c80bbbc8..924166cf957b 100644
--- a/drivers/staging/media/imx/imx-media-dev.c
+++ b/drivers/staging/media/imx/imx-media-dev.c
@@ -487,13 +487,6 @@ static int imx_media_probe(struct platform_device *pdev)
goto notifier_cleanup;
}

- ret = imx_media_add_ipu_internal_subdevs(imxmd);
- if (ret) {
- v4l2_err(&imxmd->v4l2_dev,
- "add_ipu_internal_subdevs failed with %d\n", ret);
- goto notifier_cleanup;
- }
-
/* no subdevs? just bail */
if (list_empty(&imxmd->notifier.asd_list)) {
ret = -ENODEV;
diff --git a/drivers/staging/media/imx/imx-media-internal-sd.c b/drivers/staging/media/imx/imx-media-internal-sd.c
index b8e763dbbecb..3811c12d475b 100644
--- a/drivers/staging/media/imx/imx-media-internal-sd.c
+++ b/drivers/staging/media/imx/imx-media-internal-sd.c
@@ -298,13 +298,14 @@ static int add_internal_subdev(struct imx_media_dev *imxmd,
}

/* adds the internal subdevs in one ipu */
-static int add_ipu_internal_subdevs(struct imx_media_dev *imxmd, int ipu_id)
+int imx_media_add_ipu_internal_subdevs(struct imx_media_dev *imxmd,
+ int ipu_id)
{
enum isd_enum i;
+ int ret;

for (i = 0; i < num_isd; i++) {
const struct internal_subdev *isd = &int_subdev[i];
- int ret;

/*
* the CSIs are represented in the device-tree, so those
@@ -322,25 +323,10 @@ static int add_ipu_internal_subdevs(struct imx_media_dev *imxmd, int ipu_id)
}

if (ret)
- return ret;
+ goto remove;
}

return 0;
-}
-
-int imx_media_add_ipu_internal_subdevs(struct imx_media_dev *imxmd)
-{
- int ret;
-
- ret = add_ipu_internal_subdevs(imxmd, 0);
- if (ret)
- goto remove;
-
- ret = add_ipu_internal_subdevs(imxmd, 1);
- if (ret)
- goto remove;
-
- return 0;

remove:
imx_media_remove_ipu_internal_subdevs(imxmd);
diff --git a/drivers/staging/media/imx/imx-media-of.c b/drivers/staging/media/imx/imx-media-of.c
index 2da81a5af274..32ed1a99813f 100644
--- a/drivers/staging/media/imx/imx-media-of.c
+++ b/drivers/staging/media/imx/imx-media-of.c
@@ -20,50 +20,68 @@
#include <video/imx-ipu-v3.h>
#include "imx-media.h"

-static int of_add_csi(struct imx_media_dev *imxmd, struct device_node *csi_np)
-{
- int ret;
-
- if (!of_device_is_available(csi_np)) {
- dev_dbg(imxmd->md.dev, "%s: %pOFn not enabled\n", __func__,
- csi_np);
- /* unavailable is not an error */
- return 0;
- }
-
- /* add CSI fwnode to async notifier */
- ret = imx_media_add_async_subdev(imxmd, of_fwnode_handle(csi_np), NULL);
- if (ret) {
- if (ret == -EEXIST) {
- /* already added, everything is fine */
- return 0;
- }
-
- /* other error, can't continue */
- return ret;
- }
-
- return 0;
-}
-
int imx_media_add_of_subdevs(struct imx_media_dev *imxmd,
struct device_node *np)
{
+ bool ipu_found[2] = {false, false};
struct device_node *csi_np;
int i, ret;
+ u32 ipu_id;

for (i = 0; ; i++) {
csi_np = of_parse_phandle(np, "ports", i);
if (!csi_np)
break;

- ret = of_add_csi(imxmd, csi_np);
+ if (!of_device_is_available(csi_np)) {
+ /* ignore this CSI if not available */
+ of_node_put(csi_np);
+ continue;
+ }
+
+ /* add CSI fwnode to async notifier */
+ ret = imx_media_add_async_subdev(imxmd,
+ of_fwnode_handle(csi_np),
+ NULL);
+ if (ret) {
+ if (ret == -EEXIST) {
+ /* already added, everything is fine */
+ of_node_put(csi_np);
+ continue;
+ }
+
+ /* other error, can't continue */
+ goto err_out;
+ }
+
+ ret = of_alias_get_id(csi_np->parent, "ipu");
+ if (ret < 0)
+ goto err_out;
+ if (ret > 1) {
+ ret = -EINVAL;
+ goto err_out;
+ }
+
+ ipu_id = ret;
+
+ if (!ipu_found[ipu_id]) {
+ ret = imx_media_add_ipu_internal_subdevs(imxmd,
+ ipu_id);
+ if (ret)
+ goto err_out;
+ }
+
+ ipu_found[ipu_id] = true;
+
of_node_put(csi_np);
- if (ret)
- return ret;
}

return 0;
+
+err_out:
+ imx_media_remove_ipu_internal_subdevs(imxmd);
+ of_node_put(csi_np);
+ return ret;
}

/*
diff --git a/drivers/staging/media/imx/imx-media.h b/drivers/staging/media/imx/imx-media.h
index 0f915baeac8a..d2432b8ab67d 100644
--- a/drivers/staging/media/imx/imx-media.h
+++ b/drivers/staging/media/imx/imx-media.h
@@ -237,7 +237,8 @@ struct imx_media_fim *imx_media_fim_init(struct v4l2_subdev *sd);
void imx_media_fim_free(struct imx_media_fim *fim);

/* imx-media-internal-sd.c */
-int imx_media_add_ipu_internal_subdevs(struct imx_media_dev *imxmd);
+int imx_media_add_ipu_internal_subdevs(struct imx_media_dev *imxmd,
+ int ipu_id);
int imx_media_create_ipu_internal_links(struct imx_media_dev *imxmd,
struct v4l2_subdev *sd);
void imx_media_remove_ipu_internal_subdevs(struct imx_media_dev *imxmd);
--
2.17.1
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