media: subdev: Add debug prints to enable/disable_streams

It is often useful to see when streaming for a device is being enabled
or disabled. Add debug prints for this to v4l2_subdev_enable_streams()
and v4l2_subdev_disable_streams().

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index ec35e5a90cdf1cb04b4773099060d3c438413c26..b92348ad61f6408c725f99665a732a49c3d4e35c 100644 (file)
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -1989,11 +1989,16 @@ int v4l2_subdev_enable_streams(struct v4l2_subdev *sd, u32 pad,
                goto done;
        }
 
+       dev_dbg(dev, "enable streams %u:%#llx\n", pad, streams_mask);
+
        /* Call the .enable_streams() operation. */
        ret = v4l2_subdev_call(sd, pad, enable_streams, state, pad,
                               streams_mask);
-       if (ret)
+       if (ret) {
+               dev_dbg(dev, "enable streams %u:%#llx failed: %d\n", pad,
+                       streams_mask, ret);
                goto done;
+       }
 
        /* Mark the streams as enabled. */
        for (i = 0; i < state->stream_configs.num_configs; ++i) {
@@ -2101,11 +2106,16 @@ int v4l2_subdev_disable_streams(struct v4l2_subdev *sd, u32 pad,
                goto done;
        }
 
+       dev_dbg(dev, "disable streams %u:%#llx\n", pad, streams_mask);
+
        /* Call the .disable_streams() operation. */
        ret = v4l2_subdev_call(sd, pad, disable_streams, state, pad,
                               streams_mask);
-       if (ret)
+       if (ret) {
+               dev_dbg(dev, "disable streams %u:%#llx failed: %d\n", pad,
+                       streams_mask, ret);
                goto done;
+       }
 
        /* Mark the streams as disabled. */
        for (i = 0; i < state->stream_configs.num_configs; ++i) {