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authorEzequiel Garcia <ezequiel@collabora.com>2021-01-08 18:17:28 +0100
committerMauro Carvalho Chehab <mchehab+huawei@kernel.org>2021-01-27 15:47:54 +0100
commit517fd2b6a058bc4f23735ab9a9e6b0d5c56876d1 (patch)
tree2d8339343340da5fdf19d434d1486a1f1efba52f /include
parent97cf50b6f8e5ccddab85af4e5008899338e6f220 (diff)
media: v4l2-async: Add waiting subdevices debugfs
There is currently little to no information available about the reasons why a v4l2-async device hasn't probed completely. Inspired by the "devices_deferred" debugfs file, add a file to list information about the subdevices that are on waiting lists, for each notifier. This is useful to debug v4l2-async subdevices and notifiers, for instance when doing device bring-up. For instance, a typical output would be: $ cat /sys/kernel/debug/video4linux/pending_async_subdevices ipu1_csi1: [fwnode] dev=20e0000.iomuxc-gpr:ipu1_csi1_mux, node=/soc/bus@2000000/iomuxc-gpr@20e0000/ipu1_csi1_mux ipu1_csi0: [fwnode] dev=20e0000.iomuxc-gpr:ipu1_csi0_mux, node=/soc/bus@2000000/iomuxc-gpr@20e0000/ipu1_csi0_mux imx6-mipi-csi2: [fwnode] dev=1-003c, node=/soc/bus@2100000/i2c@21a4000/camera@3c imx-media: Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Tested-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Diffstat (limited to 'include')
-rw-r--r--include/media/v4l2-async.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/media/v4l2-async.h b/include/media/v4l2-async.h
index 8ed42188e7c9..26296d4cb660 100644
--- a/include/media/v4l2-async.h
+++ b/include/media/v4l2-async.h
@@ -11,6 +11,7 @@
#include <linux/list.h>
#include <linux/mutex.h>
+struct dentry;
struct device;
struct device_node;
struct v4l2_device;
@@ -121,6 +122,13 @@ struct v4l2_async_notifier {
};
/**
+ * v4l2_async_debug_init - Initialize debugging tools.
+ *
+ * @debugfs_dir: pointer to the parent debugfs &struct dentry
+ */
+void v4l2_async_debug_init(struct dentry *debugfs_dir);
+
+/**
* v4l2_async_notifier_init - Initialize a notifier.
*
* @notifier: pointer to &struct v4l2_async_notifier